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8,400 | Future Colliders | physics.acc-ph | The high energy physics advantages, disadvantages and luminosity requirements
of hadrons, of leptons and photon-photon colliders are considered. Technical
arguments for increased energy in each type of machine are presented. Their
relative size, and the implications of size on cost are discussed. | physics |
8,401 | High Luminosity Muon Collider Design | physics.acc-ph | Muon Colliders have unique technical and physics advantages and disadvantages
when compared with both hadrons and electron machines. They should be regarded
as complementary. Parameters are given of a 4 TeV high luminosity muon-muon
collider, and of a 0.5 TeV demonstration machine. We discuss the various
systems in suc... | physics |
8,402 | On Stern-Gerlach forces allowed by special relativity and the special case of the classical spinning particle of Derbenev-Kondratenko | physics.acc-ph | This work is devoted to an examination of Stern-Gerlach forces consistent
with special relativity and is motivated by recent interest in the relativistic
Stern-Gerlach force acting on polarized protons in high-energy particle
accelerators. The equations for the orbital and spin motion of a classical
charged particle wi... | physics |
8,403 | Comparisons Between Modeling and Measured Performance of the BNL Linac | physics.acc-ph | Quite good agreement has been achieved between computer modeling and actual
performance of the Brookhaven 200 MeV Linac. We will present comparisons
between calculated and measured performance for the beam transport through the
RFQ, the 6 meter transport from RFQ to the linac and meching and transport
through the linac... | physics |
8,404 | New Expression for the Transverse Deflection of Relativistic Particle in High-Frequency Fields and Correlation with Panofsky- Wenzel Theorem | physics.acc-ph | It is shown that change in transverse momentum of a relativistic particle,
crossing an accelerating cavity parallel to its axis, may be presented as an
integral over trajectory, the integrand of which is proportional to the
component of magnetic field parallel to this axis. The changes in two
transversal components of ... | physics |
8,405 | Generator-Invertor-Dumper System of Electron (Positron) Bunches Moving in Cold plasma for Development of Strong Accelerating Electric Field | physics.acc-ph | It is shown that high accelerating gradient can be obtained in a specially
constructed system of electron (positron) bunches, moving in cold plasma,with
definite density. These combined bunch systems do not generate the wake fields
behind them and can pass through the plasma column in a periodic sequence. The
considera... | physics |
8,406 | One Dimensional Nonlinear Wake-fields Excited in a Cold Plasma by Charged Bunches | physics.acc-ph | One dimensional nonlinear plasma wake-fields excited by a single bunch and by
series of bunches are considered. Essential differences are brought to light
between negatively charged bunch case and positively one. The bunches with
nonuniform distributions of density are investigated. The obtained results show
dependence... | physics |
8,407 | High Energy Colliders | physics.acc-ph | We consider the high energy advantages, disadvantages and luminosity
requirements of hadrons, leptons and photon-photon colliders. Technical
problems in obtaining increased energy in each type of machine are presented.
The machines relative size are also discussed. | physics |
8,408 | Muon-Muon and other High Energy Colliders | physics.acc-ph | Parameters are given of 4 TeV and 0.5 TeV (c-of-m) high luminosity muon-muon
Colliders. We discuss the various systems, starting from the proton accelerator
needed to generate the muons and proceeding through muon cooling, acceleartion
and storage in a collider ring. Detector background, polarization are analyzed.
We a... | physics |
8,409 | Wire scanners in low energy accelerators | physics.acc-ph | Fast wire scanners are today considered as part of standard instrumentation
in high energy synchrotrons. The extension of their use to synchrotrons working
at lower energies, where Coulomb scattering can be important and the transverse
beam size is large, introduces new complications considering beam heating of
the wir... | physics |
8,410 | Simulations of the Interaction Region in a Photon-Photon Collider | physics.acc-ph | The status and initial performance of a simulation program CAIN for
interaction region of linear colliders is described. The program is developed
to be applicable for e+e-, e-e-, e-gamma and gamma-gamma linear colliders. As
an example of an application, simulation of a gamma-gamma collider option of
NLC is reported. | physics |
8,411 | Stability and Halo Formation in Axisymmetric Intense Beams | physics.acc-ph | Beam stability and halo formation in high-intensity axisymmetric 2D beams in
a uniform focusing channel are analyzed using particle-in-cell simulations. The
tune depression - mismatch space is explored for the uniform (KV) distribution
of the particle transverse-phase-space density, as well as for more realistic
ones (... | physics |
8,412 | The ANKA Injector | physics.acc-ph | ANKA is a 2.5 GeV synchrotron radiation storage ring under construction at
the Forschungszentrum Karlsruhe in Germany. The injector system will consist of
a pre-injector with an end energy of 20 to 50 MeV and a 0.5 GeV booster
synchrotron. In the following three different concepts for designing the
booster synchrotron ... | physics |
8,413 | Conceptual and Experimental Feasibility Study of a Superconductive Micro-Undulator | physics.acc-ph | In this paper the concept and the first successful tests towards constructing
a superconductive micro-undulator with a period length of 3.8 mm are described.
The structures were built with a commercially available NbTi wire. A full 100
periods prototype is now under construction. | physics |
8,414 | The NSNS High Energy Beam Transport Line | physics.acc-ph | In the National Spallation Neutron Source (NSNS) design, a 180 meter long
transport line connects the 1 GeV linac to an accumulator ring. The linac beam
has a current of 28 mA, pulse length of 1 ms, and 60 Hz rep rate. The high
energy transport line consists of sixteen 60 degrees FODO cells, and
accommodates a 90 degre... | physics |
8,415 | The Algebraic Reconstruction Technique (ART) | physics.acc-ph | Projections of charged particle beam current density (profiles) are
frequently used as a measure of beam position and size. In conventional
practice only two projections, usually horizontal and vertical, are measured.
This puts a severe limit on the detail of information that can be achieved. A
third projection provide... | physics |
8,416 | A superconductive undulator with period length of 3.8 mm | physics.acc-ph | During the last years several attempts were undertaken to decrease the period
length of undulators to the mm range. In this paper, a novel type of an
in-vacuum undulator is described which is built with superconductive wires. The
period length of this special device is 3.8 mm. In principle, it is possible to
decrease t... | physics |
8,417 | Linac-Ring Type Colliders: Fourth Way To TeV Scale | physics.acc-ph | The present status of suggested linac-ring type ep and gamma-p colliders is
reviewed. The main parameters of these machines as well as e-nucleus and
gamma-nucleus colliders are considered. It is shown that sufficiently high
luminosities may be achieved with a reasonable improvement of proton and
electron beam parameter... | physics |
8,418 | Muon Dynamics in a Toroidal Sector Magnet | physics.acc-ph | We present a Hamiltonian formulation of muon dynamics in toroidal sector
solenoids (bent solenoids) | physics |
8,419 | Two-dimensional Stationary Wake Fields in Vortexfree Cold Plasma. I | physics.acc-ph | Present paper is devoted to formulation of the system of the master equations
of the problem and analytical considerations of the limiting cases, which have
an exact solutions (transversal and longitudinal flat bunches, linear approxim-
ation). Presented consideration gives some hints to the construction of proper
algo... | physics |
8,420 | Muon Collider: Introduction and status | physics.acc-ph | Parameters are given of machines with center-of-mass (CoM) energies of 3 TeV
and 400 GeV but, besides a comment on neutrino radiation, the paper
concentrates on progress on the design of a machine to operate at a light Higgs
mass, assumed, for this study, to be 100 GeV (CoM). | physics |
8,421 | Resonant Diffraction Radiation and Smith-Purcell Effect | physics.acc-ph | An approach has been developed where the Smith-Purcell radiation (SPR), i.e.
emission of electrons moving close to a periodic structure, is treated as the
resonant diffraction radiation. Simple formulas have been designed for the SPR
intensity for a grating having perfectly conducting strips spaced by a vacuum
gap. The... | physics |
8,422 | The Dynamic Aperture and the High Multipole Limit | physics.acc-ph | Tracking studies have indicated that for a lattice whose elements all have a
single field multipole present, all having the same order k, the dynamic
aperture approaches a non zero limit when k becomes very large. The dynamic
aperture and other properties of the lattice, as k becomes large, will be
called the high mult... | physics |
8,423 | Superconducting Superstructure for the TESLA Collider | physics.acc-ph | We discuss the new layout of a cavity chain (superstructure) allowing, we
hope, significant cost reduction of the RF system of both linacs of the TESLA
linear collider. The proposed scheme increases the fill factor and thus makes
an effective gradient of an accelerator higher. We present mainly computations
we have per... | physics |
8,424 | First experiments with a 100 period superconductive undulator with a period length of 3.8 mm | physics.acc-ph | A prototype of a novel superconductive undulator with a period length of 3.8
mm is described. The undulator is 100 periods long. In the first tests
described in this paper the undulator was cooled in a helium bath and it was
shown that it can be operated as expected with a maximum current of 1400 A.
Afterwards the undu... | physics |
8,425 | Muon Collider Overview: Progress and Future Plans | physics.acc-ph | Besides continued work on the parameters of a 3-4 and 0.5 TeV CoM collider,
many studies are now concentrating on a machine near 100 GeV that could be a
factory for the s-channel production of Higgs particles. We mention the
research on the various components in such muon colliders, starting from the
proton accelerator... | physics |
8,426 | Wake Field Effect Analysis in APT Linac | physics.acc-ph | The 1.7-GeV 100-mA CW proton linac is now under design for the Accelerator
Production of Tritium (APT) Project. The APT linac comprises both the normal
conducting (below 211 MeV) and superconducting (SC) sections. The high current
leads to stringent restrictions on allowable beam losses (<1 nA/m), that
requires analyzi... | physics |
8,427 | Cavity Loss Factors For Non-Ultrarelativistic Beams | physics.acc-ph | Cavity loss factors can be easily computed for ultrarelativistic beams using
time-domain codes like MAFIA or ABCI. However, for non-ultrarelativistic beams
the problem is more complicated because of difficulties with its numerical
formulation in the time domain. We calculate the loss factors of a
non-ultrarelativistic ... | physics |
8,428 | Halo Formation in Spheroidal Bunches with Self-Consistent Stationary Distributions | physics.acc-ph | A new class of self-consistent 6-D phase space stationary distributions is
constructed both analytically and numerically. The beam is then mismatched
longitudinally and/or transversely, and we explore the beam stability and halo
formation for the case of 3-D axisymmetric beam bunches using particle-in-cell
simulations.... | physics |
8,429 | Multi-Bunch Dynamics in RF Photoinjectors Through an Envelope Equation Approach | physics.acc-ph | Free Electron Lasers driven by Super-Conducting Linacs require the
generation, acceleration and transport of trains of bunches with high charge,
high repetition rate and low emittance. A numerical model already developed for
the modeling of beam dynamics in SC Linacs has been now extended to treat RF
guns with proper d... | physics |
8,430 | Multi-cell RF Injectors Driven by Thermoionic Cathodes | physics.acc-ph | We present the anticipated performances of a multi-cell RF injector operated
either with a thermoionic cathode or with a gated photo-cathode. By means of a
magnetic compression and a Coherent Spontaneous Emission seeded FEL radiating
at 100 to 200 mm, the system produces a beam fully bunched with a 200 A peak
current a... | physics |
8,431 | Thomson Scattering of Coherent Diffraction Radiation by an Electron Bunch | physics.acc-ph | The paper considers the process of Thomson scattering of coherent diffraction
radiation (CDR) produced by the preceding bunch of the accelerator on one of
the following bunches. It is shown that the yield of scattered hard photons is
proportional to N$_e^3$, where N$_e$ is the number of electrons per bunch. A
geometry ... | physics |
8,432 | Symplectic tracking using point magnets and a reference orbit made of circular arcs and straight lines | physics.acc-ph | Symplectic tracking of beam particles using point magnets is achieved using a
reference orbit made of circular arcs and straight lines that join smoothly
with each other. For this choice of the reference orbit, results are given for
the transfer functions, transfer matrices, and the transit times of the magnets
and dri... | physics |
8,433 | Measurement of colliding beam-beam parameters with wide-angle beamstrahlung | physics.acc-ph | The relation between beamstrahlung observables and beam-beam topologies is
discussed. | physics |
8,434 | Large angle Beamstrahlung as a beam-beam monitoring tool | physics.acc-ph | A novel method to measure the beam-beam interaction in e+e- colliders is
presented. | physics |
8,435 | Two-dimensional Cooling of Ion Beams in Storage Rings by Narrow Broad-Band Laser Beams | physics.acc-ph | A new scheme for the two-dimensional cooling of ion beams in storage rings is
suggested in which ions interact with a counterpropagating broad-band laser
beam. The interaction region in the direction of the ion movement is much less
then the wavelength of the ion betatron oscillations. The laser beam in the
orbit plane... | physics |
8,436 | Stochastic dynamics and Fokker-Planck equation in accelerator physics | physics.acc-ph | The aim of this contribution is to study the particle dynamics in a storage
ring under the influence of noise. Some simplified stochastic beam dynamics
problems are treated by solving the corresponding Fokker-Planck equations
numerically. | physics |
8,437 | Status of Muon Collider Research and Development and Future Plans | physics.acc-ph | The status of the research on muon colliders is discussed and plans are
outlined for future theoretical and experimental studies. Besides continued
work on the parameters of a 3-4 and 0.5 TeV center-of-mass (CoM) energy
collider, many studies are now concentrating on a machine near 0.1 TeV (CoM)
that could be a factory... | physics |
8,438 | Vibrating Wire for Beam Profile Scanning | physics.acc-ph | The method for measurement of transverse profile (emittance) of the bunch by
detecting of radiation arising scattering at of the bunch on the scanning wire
is wide-spread. In this work the information about scattering bunch is proposed
to measure using the oscillation frequency of the tightened scanning wire. In
such w... | physics |
8,439 | Gravimetric Measurement of Magnetic Field Gradient Spatial Distribution | physics.acc-ph | Magnetic interaction between a weighing sample and an external magnetic field
allows to measure characteristics of magnetic field (a sample with known
magnetic characteristics), as well as the magnetic properties of a sample (a
known magnetic field). Measurement of materials magnetic permeability is a well
known applic... | physics |
8,440 | Physics Opportunities at a Muon Collider | physics.acc-ph | The case for a future high-energy collider based on muon beams is briefly
reviewed. | physics |
8,441 | QuasiCerenkov Radiation of Relativistic Electrons in Crystals in the Presence of External Excitations | physics.acc-ph | The paper is devoted to the study of the influence of crystalline lattice
distortions due to external excitations (acoustic vibrations, temperature
gradient, etc.) on the Quasicerenkov radiation. Equations describing
Quasicerenkov radiation of charged particles in distorted crystals are derived.
These equations are sol... | physics |
8,442 | An Algorithm for Calculating the Spin Tune in Circular Accelerators | physics.acc-ph | A new algorithm for calculating the spin tune and the n-axis for circular
accelerators is presented. The method resembles the one employed in the
existing program code SODOM in that one-turn numerical spin maps at equally
spaced orbit angle variables are used but it is more efficient than the latter.
Furthermore, it is... | physics |
8,443 | Considerations on the Diffraction Limitations to the Spatial Resolution of Optical Transition Radiation | physics.acc-ph | The interest in using optical transition radiation (OTR) in high energy
(multiGeV) beam diagnostics has motivated theoretical and experimental
investigations on the limitations brought by diffraction on the attainable
resolution. This paper presents calculations of the diffraction effects in an
optical set-up using OTR... | physics |
8,444 | Hamiltonian Methods for the Study of Polarized Proton Beam Dynamics in Accelerators and Storage Rings | physics.acc-ph | The equations of classical spin-orbit motion can be extended to a Hamiltonian
system in 9-dimensional phase space by introducing a coupled spin-orbit Poisson
bracket and a Hamiltonian function. After this extension and by establishing
connections between initial and extended systems it becomes possible to apply
the met... | physics |
8,445 | Study of the Four-Rod RFQ Using the Normal Mode Theory of Transmission Lines | physics.acc-ph | The normal mode theory of the transmission lines is applied to the studies of
the Four-Rod RFQ. This resonator consists of four quadrupole electrodes and
stems. It can be simulated by the four-conductor shielded transmission line,
which is loaded by sets of coaxial transmission lines corresponding to the
support stems.... | physics |
8,446 | Spectroscopy through the change of undulator parameters in dipole regime | physics.acc-ph | In this work a method of spectroscopy without monochromators for the
undulator radiation (UR) source is proposed. This method is based of changing
the magnetic field in the undulator. Different variations of field modulations
and corresponding object reaction for the case of a dipole regime of UR
exitation were conside... | physics |
8,447 | Compyter analysys of undulators with block-periodic structure | physics.acc-ph | Methods to detect the spectral sensitivity of an object using undulator
radiation without monochromators or any other spectral devices are developed.
The spectral transmission function of the object is calculated from its
response to the spectrum-integral undulator radiation with the known spectral
distribution. This r... | physics |
8,448 | Characteristics of synchrotron radiation of longitudinally polarized spinning particle in the pseudoclassical theory | physics.acc-ph | Spin dependencies of the intensity and polarization of the synchrotron
radiation of the longitudinally polarized particle performing uniform circular
motion in the magnetic field are investigated. | physics |
8,449 | Study of Multiple-Beam RFQ | physics.acc-ph | There are applications, which require MeV-range multiple-beams consisting of
a large number of identical highly packed beamlets. The multiple-beam RFQ
(MB-RFQ) arranged as a matrix array of longitudinal rod-electrodes is
appropriate candidate. A configuration of MB-RFQ resonator should ensure
identical quadrupole field... | physics |
8,450 | Linac-Ring Type phi Factory for Basic and Applied Researches | physics.acc-ph | In this paper, main parameters for linac-ring type collider desinged for
producing $\phi $ particles copiously are estimated and potential of this
machine in particle physics researches is investigated. Moreover, parameters
for free electron laser and synchrotron radiation obtained from electron linac
and positron ring... | physics |
8,451 | Resonant Diffraction Radiation from an Ultrarelativistic Particle Moving Close to a Tilted Grating | physics.acc-ph | A simple model for calculating the diffraction radiation characteristics from
an ultrarelativistic charged particle moving close to a tilted ideally
conducting strip is developed. Resonant diffraction radiation (RDR) is treated
as a superposition of the radiation fields for periodically spaced strips. The
RDR character... | physics |
8,452 | The Physics Opportunities and Technical Challenges of a Muon Collider | physics.acc-ph | We describe the physics opportunities and technical challenges of a muon
collider as a tool for exploring high energy physics phenomena. | physics |
8,453 | Variable Field Bending Magnets for Recirculating Linacs | physics.acc-ph | A lattice of single aperture superconducting variable field bending magnets
is proposed as a cheap and practical way to recirculate the beams in
recirculating linear accelerators. It is shown that the VFBM's can be
configured to provide strong focusing in both transverse planes for the full
range of beam momenta transp... | physics |
8,454 | Multiple resonance compensation for betatron coupling and its equivalence with matrix method | physics.acc-ph | Analyses of betatron coupling can be broadly divided into two categories: the
matrix approach that decouples the single-turn matrix to reveal the normal
modes and the hamiltonian approach that evaluates the coupling in terms of the
action of resonances in perturbation theory. The latter is often regarded as
being less ... | physics |
8,455 | Discussion on Muon Collider Parameters at Center of Mass Energies from 0.1 TeV to 100 TeV | physics.acc-ph | Some of the potential capabilities and design challenges of muon colliders
are illustrated using self-consistent collider parameter sets at center of mass
energies ranging from 0.1 TeV to 100 TeV. | physics |
8,456 | Studies for Muon Colliders at Center-of-Mass Energies of 10 TeV and 100 TeV | physics.acc-ph | Parameter lists are presented for speculative muon colliders at
center-of-mass energies of 10 TeV and 100 TeV. The technological advances
required to achieve the given parameters are itemized and discussed, and a
discussion is given of the design goals and constraints. An important
constraint for multi-TeV muon collide... | physics |
8,457 | Concept of Powerful Multistage Coaxial Cyclotron for Pulsed and Continuous Beam Production | physics.acc-ph | The concept of large-radius multistage coaxial cyclotrons having separated
orbits is described, to generate proton beams of 120-2000 MeV energy at tens of
GW pulsed and hundreds of MW in continuous beam power operation. Accelerated
beam losses must be less than 0.1 W/m for the intercepted average beam power
linear dens... | physics |
8,458 | Beam extraction studies at 900 GeV using a channeling crystal | physics.acc-ph | Luminosity-driven channeling extraction has been observed for the first time
in a 900 GeV study at the Fermilab Tevatron. This experiment, Fermilab E853,
demonstrated that useful TeV level beams can be extracted from a
superconducting accelerator during high luminosity collider operations without
unduly affecting the b... | physics |
8,459 | Theory of the tune shift due to linear coupling | physics.acc-ph | The presence of skew quadrupole fields will linearly couple the x and y
motions. The x and y motions can then be written as the sum of two normal modes
>. This paper presents analytical perturbation theory results for the tunes of
the normal modes. The results for the normal mode tunes are first found correct
to lowest... | physics |
8,460 | Expression of Interest in R&D towards a Neutrino Factory Based on a Storage Ring and a Muon Collider | physics.acc-ph | We are exploring the feasibility of a neutrino factory based on a muon
storage ring. In this, beams of nu_mu and nubar_e arise from the decay of mu-
particles (or alternatively, nubar_mu and nu_e from mu+). The muons come from
the decay of low-energy pions produced by a megawatt proton beam incident on a
nuclear target... | physics |
8,461 | Single-Pass Lazer Polarization of Ultrarelativistic Positrons | physics.acc-ph | The new method for producing of the polarized relativistic positrons is
suggested. A beam of unpolarized positrons accelerated up to a few GeV can be
polarized during a head-on collision with an intense circularly polarized lazer
wave. After a multiple Compton backscattering process the initial positrons may
lose a sub... | physics |
8,462 | Beam Coupling Impedances of Small Discontinuities | physics.acc-ph | A general derivation of the beam coupling impedances produced by small
discontinuities on the wall of the vacuum chamber of an accelerator is
reviewed. A collection of analytical formulas for the impedances of small
obstacles is presented. | physics |
8,463 | Simulation of Laser-Compton Cooling of Electron Beams | physics.acc-ph | We study a method of laser-Compton cooling of electron beams. Using a Monte
Carlo code, we evaluate the effects of the laser-electron interaction for
transverse cooling. The optics with and without chromatic correction for the
cooling are examined. The laser-Compton cooling for JLC/NLC at E_0=2 GeV is
considered. | physics |
8,464 | Feasibility of backward diffraction radiation for non-destructive diagnostics of relativistic charged particle beams | physics.acc-ph | The characteristics of backward diffraction radiation (BDR), i.e. radiation
of the charged particle passing through a slit in the tilted screen, has been
considered. The technique for non-destructive beam diagnostics based on the
measurements of BDR yield for different tilted angles (theta-scan) is
suggested. | physics |
8,465 | The Superconducting TESLA Cavities | physics.acc-ph | The conceptional design of the proposed linear electron-positron collider
TESLA is based on 9-cell 1.3 GHz superconducting niobium cavities with an
accelerating gradient of Eacc >= 25 MV/m at a quality factor Q0 > 5E+9. The
design goal for the cavities of the TESLA Test Facility (TTF) linac was set to
the more moderate... | physics |
8,466 | Asynchronous accelerator with RFQ injection for active longitudinal compression of accelerated bunches | physics.acc-ph | An asynchronous accelerator is described, in which the principle of its
operation permits the active longitudinal bunch compression of accelerated
proton beams, to overcome the space charge limitation effects of intense
bunches. It is shown that accelerated bunches from an RFQ linac can be adapted
for Asynchronac injec... | physics |
8,467 | Diffraction Radiation Diagnostics for Moderate to High Energy Charged Particle Beams | physics.acc-ph | Diffraction radiation (DR) is produced when a charged particle passes through
an aperture or near a discontinuity in the media in which it is traveling. DR
is closely related to transition radiation (TR), which is produced when a
charged particle traverses the boundary between media with different dielectric
constants.... | physics |
8,468 | Radiation from a Superluminal Source | physics.acc-ph | The sweep speed of an electron beam across the face of an oscilloscope can
exceed the velocity of light, although of course the velocity of the electrons
does not. Associated with this possibility there should be a kind of Cherenkov
radiation, as if the oscilloscope trace were due to a charge moving with
superluminal v... | physics |
8,469 | Classical "Dressing" of a Free Electron in a Plane Electromagnetic Wave | physics.acc-ph | The energy and momentum densities of the fields of a free electron in a plane
electromagnetic wave include interference terms that are the classical version
of the ``dressing'' of the electron the arises in a quantum analysis. The
transverse mechanical momentum of the oscillating electron is balanced by the
field momen... | physics |
8,470 | The Hawking-Unruh Temperature and Quantum Fluctuations in Particle Accelerators | physics.acc-ph | We wish to draw attention to a novel view of the effect of the quantum
fluctuations during the radiation of accelerated particles, particularly those
in storage rings. This view is inspired by the remarkable insight of Hawking
that the effect of the strong gravitational field of a black hole on the
quantum fluctuations... | physics |
8,471 | The Hawking-Unruh Temperature and Damping in a Linear Focusing Channel | physics.acc-ph | The Hawking-Unruh effective temperature, hbar a* / 2 pi c k, due to quantum
fluctuations in the radiation of an accelerated charged-particle beam can be
used to show that transverse oscillations of the beam in a practical linear
focusing channel damp to the quantum-mechanical limit. A comparison is made
between this be... | physics |
8,472 | Energy Balance in an Electrostatic Accelerator | physics.acc-ph | The principle of an electrostatic accelerator is that when a charge e escapes
from a conducting plane that supports a uniform electric field of strength E_0,
then the charge gains energy e E_0 d as it moves distance d from the plane.
Where does this energy come from? We that the mechanical energy gain of the
electron i... | physics |
8,473 | The Grating Accelerator | physics.acc-ph | In optics, a reflective grating is a conducting surface with a ripple. The
typical use of such a grating involves an incident electromagnetic wave with
wave vector k in the x-z plane, and interference effects lead to a discrete set
of reflected waves also with wave vectors in the x-z plane. Consider, instead,
an incide... | physics |
8,474 | The Laser-Driven Vacuum Photodiode | physics.acc-ph | A vacuum photodiode driven by a pulsed laser can sustain an average current
very similar to that of a continous diode, where the latter is described by
Child's law. | physics |
8,475 | The Helical Wiggler | physics.acc-ph | There is not a unique solution to the electro- or magnetostatic problem where
the "boundary condition" is merely a specification of the fields along a line.
As a practical example, we consider the case where it is desired to have a
magnetic field that that traces a helix about the z axis. | physics |
8,476 | Temporary Acceleration of Electrons While Inside an Intense Electromagnetic Pulse | physics.acc-ph | A free electron can temporarily gain a very significant amount of energy if
it is overrun by an intense electromagnetic wave. In principle, this process
would permit large enhancements in the center-of-mass energy of
electron-electron, electron-positron and electron-photon interactions if these
take place in the presen... | physics |
8,477 | Novel approach for spin-flipping a stored polarized beam | physics.acc-ph | The traditional method of spin-flipping a stored polarized beam is based on
slowly crossing an rf induced depolarizing resonance. This paper discusses a
novel approach where the polarization reversal is achieved by trapping the beam
polarization into a stable spin-flipping motion on top of the rf induced
resonance at a... | physics |
8,478 | Test Results on the Silicon Pixel Detector for the TTF-FEL Beam Trajectory Monitor | physics.acc-ph | Test measurements on the silicon pixel detector for the beam trajectory
monitor at the free electron laser of the TESLA test facility are presented. To
determine the electronic noise of detector and read-out and to calibrate the
signal amplitude of different pixels the 6 keV photons of the manganese K line
are used. Tw... | physics |
8,479 | Design and Simulation of a High Frequency High Power Rf Extraction Device Using a Dielectric-Loaded Waveguide | physics.acc-ph | We consider the use of a dielectric-loaded structure to extract rf energy
from a high current electron drive beam as a power source for a high energy
two-beam accelerator. This represents an alternative technique which we show to
have some significant advantages over the use of the currently proposed
corrugated metal s... | physics |
8,480 | A Cupronickel Rotating Band Pion Production Target for Muon Colliders | physics.acc-ph | A conceptual design is presented for a high power cupronickel pion production
target. It forms a circular band in a horizontal plane with approximate
dimensions of: 2.5 meters radius, 6 cm high and 0.6 cm thick. The target is
continuously rotated at 3 m/s to carry heat away from the production region to
a water cooling... | physics |
8,481 | Rotating Band Pion Production Targets for Muon Colliders and Neutrino Factories | physics.acc-ph | An update is presented on a conceptual design for a pion production target
station using a rotating cupronickel band and that was originally proposed for
use at a muon collider facility with a 4 MW pulsed proton beam. After reviewing
the salient design features and motivations for this target, ongoing studies
are descr... | physics |
8,482 | Parameter Sets for 10 TeV and 100 TeV Muon Colliders, and their Study at the HEMC'99 Workshop | physics.acc-ph | A focal point for the HEMC'99 workshop was the evaluation of straw-man
parameter sets for the acceleration and collider rings of muon colliders at
center of mass energies of 10 TeV and 100 TeV. These self-consistent parameter
sets are presented and discussed. The methods and assumptions used in their
generation are des... | physics |
8,483 | Analytical treatment of the emittance growth in the main Linacs of future linear colliders | physics.acc-ph | In this paper the single and multibunch emittance growths in the main linac
of a linear collider are analytically treated in analogy to the Brownian motion
of a molecule, and the analytical formulae for the emittance growth due to
accelerating structure misalignment errors are obtained by solving Langevin
equation. The... | physics |
8,484 | Analytical estimation of the dynamic apertures of circular accelerators | physics.acc-ph | By considering delta function sextupole, octupole, and decapole perturbations
and using difference action-angle variable equations, we find some useful
analytical formulae for the estimation of the dynamic apertures of circular
accelerators due to single sextupole, single octupole, single decapole (single
2$m$ pole in ... | physics |
8,485 | Polarized Protons in HERA | physics.acc-ph | Polarized proton beams at HERA can currently only be produced by extracting a
beam from a polarized source and then accelerating it in the three synchrotrons
at DESY. In this paper, the processes which can depolarize a proton beam in
circular accelerators are explained, devices which could avoid this
depolarization in ... | physics |
8,486 | Successive approximations for charged particle motion | physics.acc-ph | Single particle dynamics in electron microscopes, ion or electron
lithographic instruments, particle accelerators, and particle spectrographs is
described by weakly nonlinear ordinary differential equations. Therefore, the
linear part of the equation of motion is usually solved and the nonlinear
effects are then found ... | physics |
8,487 | First Observation of Self-Amplified Spontaneous Emission in a Free-Electron Laser at 109 nm Wavelength | physics.acc-ph | We present the first observation of Self-Amplified Spontaneous Emission
(SASE) in a free-electron laser (FEL) in the Vacuum Ultraviolet regime at 109
nm wavelength (11 eV). The observed free-electron laser gain (approx. 3000) and
the radiation characteristics, such as dependency on bunch charge, angular
distribution, s... | physics |
8,488 | Upgrade of the PEP-II Low Beta Optics | physics.acc-ph | The successful commissioning and operation of the PEP-II asymmetric e+e-
collider motivated further studies to increase luminosity. In this paper, we
discuss a modification of the PEP-II lattice to reduce the vertical beta
function at the Interaction Point (IP) from the design value of 1.5cm to 1.0cm.
This could potent... | physics |
8,489 | Prediction of long term stability by extrapolation | physics.acc-ph | This paper studies the possibility of using the survival function to predict
long term stability by extrapolation. The survival function is a function of
the initial coordinates and is the number of turns a particle will survive for
a given set of initial coordinates. To determine the difficulties in
extrapolating the ... | physics |
8,490 | Beam Current Monitors in the Nlcta | physics.acc-ph | The current profile along the 126 ns, multi-bunch beam pulse in the Next
Linear Collider Test Accelerator (NLCTA) is monitored with fast toroids (rise
time ~1 ns). Inserted at several positions along the beam line, they allow us
to track current transmission as a function of position along the bunch train.
Various meas... | physics |
8,491 | Beam Profile Monitors in the Nlcta | physics.acc-ph | The transverse current profile in the Next Linear Collider Test Accelerator
(NLCTA) electron beam can be monitored at several locations along the beam line
by means of profile monitors. These consist of insertable phosphor screens,
light collection and transport systems, CID cameras, a frame-grabber, and PC
and VAX bas... | physics |
8,492 | The Proposed NLC Linac LLRF System | physics.acc-ph | The proposed Next Linear Collider (NLC) contains linac systems operating at
L,S,C, and X band. This paper describes a wideband modular low-level RF (LLRF)
system applicable for all NLC pulsed RF systems. High speed digital IF
techniques are used for both arbitrary klystron drive modulation and accurate
RF vector detect... | physics |
8,493 | Experience with the Pep-II RF System at High Beam Currents | physics.acc-ph | The PEP-II B Factory Low-Level RF System (LLRF) is a fully programmable VXI
based design running under an EPICS control environment. Several RF feedback
loops are used to control longitudinal coupled-bunch modes driven by the
accelerating mode of the RF cavities. This paper updates the performance of the
LLRF system as... | physics |
8,494 | New Design Study and Related Experimental Program for the LCLS RF Photoinjector | physics.acc-ph | We report the results of a recent beam dynamics study, motivated by the need
to redesign the LCLS photoinjector, that lead to the discovery of a new
effective working point for a split RF photoinjector. We consider the emittance
compensation regime of a space charge beam: by increasing the solenoid
strength, the emitta... | physics |
8,495 | Design Studies for a High Current Bunching System for CLIC Test Facility (CTF3) Drive Beam | physics.acc-ph | A bunching system is proposed for the initial stage of CTF3 which consists of
one (two) 3 GHz prebunchers and one 3 GHz travelling wave (TW) buncher with
variable phase velocities. The electron beam is emitted from a 140 KV DC gun.
Since the macropulse beam current (3.5 A) at the exit of the TW buncher is
rather high, ... | physics |
8,496 | Lattice Matching with a Quadrupole Missing | physics.acc-ph | The lattice for the present design of the TESLA Linear Collider with
integrated X-Ray Laser Facility is basically a FODO structure with constant
beta-function. There are more than 800 individually powered superconducting
quadrupoles to focus the beam in the two main linear accelerators (each with a
length of 15 km). Fo... | physics |
8,497 | Further Studies on the Prospects for Many-TeV Muon Colliders | physics.acc-ph | New self-consistent parameter sets are presented and discussed for muon
collider rings at center-of-mass energies of 10, 30 and 100 TeV. All three
parameter sets attain luminosities of 3 x 10^35 /cm^2/s. The parameter sets
benefit from new insights gained at the HEMC'99 workshop that considered the
feasibility of many-... | physics |
8,498 | Development of rebunching cavities at IAP | physics.acc-ph | A focus of work at IAP has been the development and optimization of spiral
loaded cavities since the 1970s [A. Schempp et al, NIM 135, 409 (1976)]. These
cavities feature a high efficiency, a compact design and a big variety of
possible fields of application. They find use both as bunchers and post
accelerators to vary... | physics |
8,499 | Measurement of the temporal response of ferroelectric cathodes | physics.acc-ph | Ferroelectric ceramics are tested as photocathodes at INFN Frascati
Laboratories. In order to characterize them for use in linac injectors it is
important to measure the temporal shape of the emitted current. With a duration
of the laser pulse of 25 ps, the required resolution is a few ps. An apparatus
has been set up ... | physics |
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