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Advanced R D for electron and photon beams at Brookhaven National Laboratory

Description: The Brookhaven Accelerator Test Facility consists of a 50-MeV linear accelerator and a laser system capable of generating short (a few picoseconds) laser pulses at both UV (266 nm) and infrared (10 [mu]m) wavelengths. With these systems in place, the ATF has unique capabilities for the study of fundamental interactions between charged-particle beams and intense electromagnetic radiation. The principal research goals of the Accelerator Test Facility (ATF) axe the following. Laser Acceleration Program: We wig study the principles and techniques of particle acceleration at ultra-high frequencies (up to 30 THz) and with very high acceleration gradients (up to 1 GV/m). Production of Coherent Radiation: We wish to develop the next generation of photon sources with features like (a) short pulses (picoseconds or less), (b) coherence, and (c) high peak power. All of these attributes can be provided by free-electron lasers. High-brightness sources: A common denominator for the above programs is the need for electron beams with very small transverse and longitudinal emittances. We will devote a substantial amount of our resources to the production and understanding of electron beams that have these attributes. We will build advanced electron sources such as switched-power devices and rf guns with photocathodes. Important applications of this line of research include the development of high-luminosity linear colliders and free-electron lasers in the XUV regime.
Date: August 1, 1989
Creator: Kirk, H.G.
Partner: UNT Libraries Government Documents Department

Modeling of the Cluster Klystron Solenoid

Description: The code POISSON is used to determine the longitudinal extent of the good field region of the cluster klystron solenoid. The field shape as a function of end-coil current enhancements is determined.
Date: June 29, 1993
Creator: Kirk, H. G.
Partner: UNT Libraries Government Documents Department

End fields of CBA superconducting magnets

Description: Measurements of the two dimensional harmonic content of the end fields generated by the Brookhaven CBA dipole and quadrupole superconducting magnets are presented. Both the local longitudinal structure and the integrated end effects are examined.
Date: January 1, 1983
Creator: Kirk, H.G.; Herrera, J. & Willen, E.
Partner: UNT Libraries Government Documents Department

Advanced R&D for electron and photon beams at Brookhaven National Laboratory

Description: The Brookhaven Accelerator Test Facility consists of a 50-MeV linear accelerator and a laser system capable of generating short (a few picoseconds) laser pulses at both UV (266 nm) and infrared (10 {mu}m) wavelengths. With these systems in place, the ATF has unique capabilities for the study of fundamental interactions between charged-particle beams and intense electromagnetic radiation. The principal research goals of the Accelerator Test Facility (ATF) axe the following. Laser Acceleration Program: We wig study the principles and techniques of particle acceleration at ultra-high frequencies (up to 30 THz) and with very high acceleration gradients (up to 1 GV/m). Production of Coherent Radiation: We wish to develop the next generation of photon sources with features like (a) short pulses (picoseconds or less), (b) coherence, and (c) high peak power. All of these attributes can be provided by free-electron lasers. High-brightness sources: A common denominator for the above programs is the need for electron beams with very small transverse and longitudinal emittances. We will devote a substantial amount of our resources to the production and understanding of electron beams that have these attributes. We will build advanced electron sources such as switched-power devices and rf guns with photocathodes. Important applications of this line of research include the development of high-luminosity linear colliders and free-electron lasers in the XUV regime.
Date: August 1, 1989
Creator: Kirk, H. G.
Partner: UNT Libraries Government Documents Department

Optimization of the Brookhaven ATF inline-injection system utilizing PARMELA

Description: An S-band, RF gun-linac, inline-injection system is being installed at the Brookhaven Accelerator Test Facility. An optimization of the system parameters has been done utilizing the electron beam code PARMELA. We describe the results of this procedure and estimate the brightness of the resulting electron beam. We also incorporate the effects of wake fields into the simulation and evaluate their effects on the beam brightness.
Date: June 1, 1994
Creator: Gallardo, J.C. & Kirk, H.G.
Partner: UNT Libraries Government Documents Department

An injection scheme for the Brookhaven ATF utilizing space-charge emittance growth compensation

Description: We consider possible configurations for injection of photocathode-produced electron beams straight into linear accelerating sections. A slightly convergent beam into the linac is required for maximum transmission through the linac sections and therefore a solenoid pair is considered. We describe strategies for placing the rf gun injector and the strength of the solenoids so as to minimize the emittance growth of the beam as it traverses the linac sections. The simulation codes PARMELA and TRACE 3-D were used for this design study.
Date: May 1, 1993
Creator: Gallardo, J. C. & Kirk, H. G.
Partner: UNT Libraries Government Documents Department

TARGETRY FOR A MU+MU- COLLIDER.

Description: The requirement for high luminosity in a {mu}{sup +}{mu}{sup -} collider leads one to conclude that a prodigious source of pions is needed followed by an efficient capture/decay channel. Significant targetry issues are raised by these demands. Among these are (1) the best target configuration to tolerate a high-rep rate, high-power proton beam ({approx} 10{sup 14} ppp at 15 Hz), (2) the pion spectra of the produced pions and (3) the best configuration for maximizing the quantity of captured pions. In this paper, the current thinking of the {mu}{sup +}{mu}{sup -} collider collaboration for solutions to these issues is discussed. In addition, we give a description of the R&D program designed to provide a proof-of-principle for a muon capture system capable of meeting the demands of a future high-luminosity machine.
Date: March 29, 1999
Creator: KIRK,H. G.
Partner: UNT Libraries Government Documents Department

A comparison of L-band and C-band RF guns as sources for inline-injection systems

Description: We consider the beam dynamics associated with installing a BNL type 1{1/2} cell L-band or C-band rf gun before two TESLA L-band cryomodules. This system will deliver a 25 MeV electron beam with peak currents on the order of 100 A suitable for further magnetic compression. We evaluate the injection systems utilizing the electron beam dynamic code PARMELA from the point of view of minimizing the transverse invariant emittance.
Date: June 1, 1995
Creator: Gallardo, J.C.; Kirk, H.G. & Meyerer, T.
Partner: UNT Libraries Government Documents Department

A comparison of L-band and C-band rf guns as sources for inline-injection systems

Description: We consider the beam dynamics associated with installing a BNL type 1 1/2 cell L-band or C-band rf gun before two TESLA L-band cryomodules. This system will deliver a 25 MeV electron beam with peak currents on the order of 100 A suitable for further magnetic compression. evaluate the injection systems utilizing the electron beam dynamic code PARMELA from the point of view of minimizing the transverse invariant emittance.
Date: December 1, 1994
Creator: Gallardo, J.C.; Kirk, H.G. & Meyerer, T.
Partner: UNT Libraries Government Documents Department

A comparative study of RF and induction linac approaches to phase rotation of a muon bunch in the production region of a {mu}{sup +}- {mu}{sup {minus}} collider

Description: RF and induction linac approaches to phase rotation of the muon bunch have been studied. Shorter accelerator length, lower power consumption and shorter bunch length favor the RF linac approach. An important outstanding research issue is the operation of RF cavities within 2 - 3 meters of the production target and the accompanying very high radiation background.
Date: October 1996
Creator: Turner, W. C. & Kirk, H. G.
Partner: UNT Libraries Government Documents Department

PION PRODUCTION MODELS AND NEUTRINO FACTORIES

Description: Scenarios for the building of muon colliders or storage rings suitable for the generation of robust neutrino beams call for the generation of a prodigious quantity of pions. These pions are then conducted into a decay channel where the resulting muon decay products can be collected for cooling and subsequent acceleration. Central to this concept is the design and construction of a target which will be highly efficient in producing pions of both signs while mitigating the absorption of these pions before they decay. This design effort is being facilitated by using two computer codes FLUKA and MARS. The authors present comparisons of the two computer codes and also present a comparison of these codes with available data.
Date: February 11, 2000
Creator: COLLOT,J.; KIRK,H.G. & MOKHOV,N.V.
Partner: UNT Libraries Government Documents Department

Possible demonstration of ionization cooling using absorbers in a solenoidal field

Description: Ionization cooling may play an important role in reducing the phase space volume of muons for a future muon-muon collider. We describe a possible experiment to demonstrate transverse emittance cooling using a muon beam at the AGS at Brookhaven National Laboratory. The experiment uses device dimensions and parameters and beam conditions similar to what is expected in an actual muon-muon collider.
Date: December 1, 1995
Creator: Fernow, R.C.; Gallardo, J.C. & Kirk, H.G.
Partner: UNT Libraries Government Documents Department

PROGRESS TOWARD A MUON RING COOLER.

Description: We describe progress toward the design and analysis of a storage ring for cooling a muon beam by the process of ionization cooling. Our primary strategy entails the design and optimization of the lattice using the code SYNCH, followed by the transfer of parameters to the code ICOOL which allows for the tracking of particles through rf cavities and absorbers of various dimensions. Our ultimate goal is to obtain longitudinal cooling and either transverse cooling or minimal transverse emittance heating.
Date: July 1, 2001
Creator: KIRK,H.G.; CLINE,D.; FUKUI,Y. & GARREN,A.
Partner: UNT Libraries Government Documents Department

The Brookhaven accelerator test facility injection system

Description: The Brookhaven Accelerator Test Facility (ATF) consists of a 50-MeV/c electron linac and a high-brightness RF-gun both operating at 2856 MHz. An extremely short (a few picoseconds) electron pulse with low transverse emittance is generated by the RF-gun. In order to preserve both longitudinal and transverse emittances, great care must be taken in transporting the electron beam from the RF-gun to the linac. We describe the injection line, present first- and second-order lattice studies of the injection line, and study nonlinear effects on the emittance. 11 refs., 4 figs., 4 tabs.
Date: January 1, 1989
Creator: Wang, X.J.; Kirk, H.G.; Pellegrini, C.; McDonald, K.T. & Russell, D.P.
Partner: UNT Libraries Government Documents Department

ATF beamline 1 analysis spectrometer

Description: We describe the design parameters and expected performance of the analysis spectrometer for beamline 1 at the BNL Accelerator Test Facility. The spectrometer should be well suited for measuring the change in energy caused by the first generation laser acceleration experiments.
Date: January 1, 1993
Creator: Fernow, R.C.; Kirk, H.G. & Ulc, S.
Partner: UNT Libraries Government Documents Department

The visible Smith-Purcell radiation search

Description: We report here the results of an experiment at the Accelerator Test Facility at Brookhaven National Laboratory to search for the production of visible radiation from the Smith-Purcell effect using a 3 MeV electron beam. After running the experiment under a variety of conditions we were unable to isolate a definite signal from Smith-Parcell effect. Any Smith-Purcell signal present in the measured radiation was less than 10% of the background signal.
Date: March 1, 1994
Creator: Fernow, R. C.; Kirk, H. G. & Ulc, S. Wang, X.
Partner: UNT Libraries Government Documents Department

Design of rf conditioner cavities

Description: Theoretical studies are made of radio frequency structures which can be used to condition electron beams so as to greatly reduce the stringent emittance requirements for successful lasing in a free-electron laser. The basic strategy of conditioning calls for modulating an electron beam in the transverse dimension, by a periodic focusing channel, while it traverses a series of rf cavities, each operating in a TM{sub 210} mode. In this paper, we analyze the cavities both analytically and numerically (using MAFIA simulations). We find that when cylindrical symmetry is broken the coupling impedance can be greatly enhanced. We present results showing various performance characteristics as a function of cavity parameters, as well as possible designs for conditioning cavities.
Date: June 1, 1992
Creator: Govil, R.; Rimmer, R. A.; Sessler, A. & Kirk, H. G.
Partner: UNT Libraries Government Documents Department

MOVING SOLID METALLIC TARGETS FOR PION PRODUCTION IN THE MUON COLLIDER/NEUTRINO FACTORY PROJECT.

Description: The production of large fluxes of pions and muons using high-energy, high-intensity proton pulses impinging on solid or liquid targets presents unique problems which have not yet been entirely solved. We investigate the possibilities of using solid targets by choosing a metal of either extremely low thermal expansion coefficient 1 or exceptionally high mechanical strength. Candidates are respectively Super-Invar and Vascomax 350 or Inconel 718. Moving targets in the form of chains or cables would be required for cooling purposes. These materials seem easily capable of surviving the beam pulses required for the largest beam power contemplated. Questions regarding radiation damage effects are being investigated.
Date: March 3, 2004
Creator: THIEBERGER,P. KIRK,H. G. WEGGEL,R. J. MCDONALD,K.
Partner: UNT Libraries Government Documents Department

Magnetic field properties of the ISABELLE Project superconducting dipole magnets

Description: A series of prototype superconducting dipole magnets have been constructed and tested as part of the ISABELLE Project research and development program. Results of magnetic field measurements are presented with emphasis placed on the DC and AC components of the main field. Magnetization and the effects of the magnetic fields at the ends of the magnet are displayed.
Date: January 1, 1981
Creator: Kirk, H.G.; Engelmann, R.; Herrera, J.; Jaeger, K.; Robins, K. & Willen, E.
Partner: UNT Libraries Government Documents Department

ATF beamline 1 analysis spectrometer

Description: We describe the design parameters and expected performance of the analysis spectrometer for beamline 1 at the BNL Accelerator Test Facility. The spectrometer should be well suited for measuring the change in energy caused by the first generation laser acceleration experiments.
Date: January 1, 1993
Creator: Fernow, R. C.; Kirk, H. G. & Ulc, S.
Partner: UNT Libraries Government Documents Department

Solenoid fringe field compensation for the Cluster Klystron

Description: Optimization of the solenoid pancake currents so as to have a uniform axial magnetic field over an extended volume, is very important for the successful operation of the Cluster Klystron. By boosting the first and the last pancake currents by 35%, a uniform field Br/Bz {le} 0.1% at radius R {le} 2 cm can be extended from {+-} 7 cm to {+-} 16 cm. The result confirms simulations and the requirements for a 3-beam Cluster Klystron Experiment are achieved.
Date: April 1, 1996
Creator: Wang, H.; Fernow, R.C.; Kirk, H.G.; Palmer, R.B. & Zhao, Y.
Partner: UNT Libraries Government Documents Department

Ionization cooling in the muon collider

Description: The muon beams in a high luminosity muon collider are produced with a very large emittance. The process of ionization cooling offers a method for reducing the 6-dimensional normalized emittance of the beam by a factor of {approx} 10{sup 6}. A simple analytic theory has been developed that demonstrates the dependence of the net cooling on various experimental parameters. The simple theory has been checked and realistic arrangements have been examined using Monte Carlo simulations. Transverse cooling of the initial beam can be achieved using passive Li absorbers in a FOFO lattice. The last factor of 10 in transverse cooling probably requires the use of current-carrying Li lenses. Efficient longitudinal cooling requires the use of wedge shaped absorbers in a dispersive section of the beam line. An example, multi-stage cooling scenario has been developed that meets the requirements of the muon collider. Preliminary designs have been made of solenoids for use in the FOFO lattice and of solenoids and dipoles for use in the emittance exchange sections. Detailed simulation work, farther optimization, and preparations for experimental demonstrations of critical components are currently in progress.
Date: October 1996
Creator: Fernow, R. C.; Gallardo, J. C.; Kirk, H. G. & Palmer, R. B.
Partner: UNT Libraries Government Documents Department

Transverse cooling in the muon collider

Description: Ionization cooling is the preferred method for reducing the emittance of muon beams in a muon collider. The method described here uses passive liquid hydrogen absorbers and rf acceleration in an alternating lattice of solenoids. The authors consider the basic principles of ionization cooling, indicating the reasons for selecting various parameters. Tracking simulations are used to make detailed examinations of effects on the beam, such as transmission losses, transverse cooling, bunch lengthening, and introduction of energy spread. The system reduces the overall 6-dimensional emittance to 44% of its initial value.
Date: July 1, 1998
Creator: Fernow, R.C.; Gallardo, J.C.; Kirk, H.G. & Palmer, R.B.
Partner: UNT Libraries Government Documents Department