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Performance of photocathode rf gun electron accelerators

Description: In Photo-Injectors (PI) electron guns, electrons are emitted from a photocathode by a short laser pulse and then accelerated by intense rf fields in a resonant cavity. The best known advantage of this technique is the high peak current with a good emittance (high brightness). This is important for short wavelength Free-Electron Lasers and linear colliders. PIs are in operation in many electron accelerator facilities and a large number of new guns are under construction. Some applications have e… more
Date: January 1, 1993
Creator: Ben-Zvi, Ilan
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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A flat-cathode thermionic injector for the PHERMEX Radiographic Facility

Description: The PHERMEX (Pulsed High-Energy Radiographic Machine Emitting X-rays) standing-wave linear accelerator is a high-current electron beam generator used for flash-radiography. An improved electron gun has been designed employing a flat-thermionic cathode to replace the existing Pierce-geometry gun. The flat cathode yields increased current with the same applied voltage and cathode area as the Pierce gun. The ISIS code simulations indicate a beam current of 1.5 kA at 600 kV. The new geometry also r… more
Date: January 1, 1993
Creator: Kauppila, T.; Builta, L.; Burns, M.; Gregory, W.; Honaberger, D.; Watson, S. (Los Alamos National Lab., NM (United States)) et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Amended proposal for R&D on a cluster klystron

Description: This Proposal is an updated version of FWP submitted in March 1992. Significant work has been done since the original proposal, and much of this is reported on in this update. In addition there have been several changes made, some in response to suggestions made by the three reviews sent to us in December, 1992. The new information and changes include: Technical information on the proposed design of the magnetron gun, the magnet, acceleration gap, and electrical system (including a comment on e… more
Date: January 1, 1993
Creator: Fernow, R. C.; Fischer, J.; Gallardo, J. C.; Kirk, H. G.; Ko, S. K.; Palmer, R. B. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Polarized source performance in 1992 for SLC--SLD

Description: In its initial operation, the SLC Polarized Electron Source successfully met the SLC goals for 1992 for intensity and efficiency. However, the stability of the beam at the source was marginal, and the polarization was only {approximately}28%. The SLC goal to provide > 10,000 Z events for the SLD from polarized electrons was met.
Date: February 1, 1993
Creator: Schultz, D.; Alley, R.; Clendenin, J.; Frisch, J.; Garden, C.; Hoyt, E. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Experience with a radio frequency gun on the SSRL Injector Linac

Description: A-SSRL/Varian-Associates-built, one-and-a-half cavity microwave, thermionic-cathode gun has operated on the SSRL Injector Linac reliably without changing the cathode for over 10,000 hours, with no significant decrease in emission. Thus, for a pulsed electron beam, with a maximum of 0.5 A peak at 2 to 3 MeV from a 3.5 MW peak rf pulse of 2 {mu}s pulse width at 10 pps, the apparent but small amount of back bombardment of the cathode has been tolerable. Use of a bunch-compression alpha magnet and … more
Date: April 1, 1993
Creator: Weaver, J. N.; Genin, R. D.; Golceff, P.; Morales, H. & Sebek, J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Foil support structure for large electron guns

Description: This paper describes a novel support structure for a vacuum diode used to pump a gaseous laser with an electron beam. Conventional support structures are designed to hold a foil flat and rigid. This new structure takes advantage of the significantly greater strength of metals in pure tension, utilizing curved shapes for both foil and support structure. The shape of the foil is comparable to the skin of a balloon, and the shape of the support structures is comparable to the cables of a suspensio… more
Date: August 1, 1993
Creator: Brucker, J. P. & Rose, E. A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Automatic emittance measurement at the ATF

Description: An automatic emittance measurement system to characterize the transverse emittance of the electron beam produced by the BNL photocathode electron gun is described. The system utilize a VAX workstation and a Spiricon beam analyzer. A operator window (created through the Vista control software package) controls the emittance measurement system and the graphic presentation of the results. Quadrupole variation method is used for the ATF automatic emittance measurement system. A simple emittance for… more
Date: July 1, 1993
Creator: Wang, X. J.; Malone, R.; Batchelor, K. & Ben-Zvi, Ilan
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Design and construction a full copper photocathode RF gun

Description: The design and construction of an all copper S-band one-and-half cell photocathode electron gun without a choke joint is described. The methods utilized to determine the field balance at the operational frequency without usage of the bead pulling perturbation measurement is given together wit the computational data.
Date: July 1, 1993
Creator: Wang, X. J.; Batchelor, K.; Ben-Zvi, Ilan; Lynch, D.; Sheehan, J. & Woodle, M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Design of the Advanced Light Source timing system

Description: The Advanced Light Source (ALS) is a third generation synchrotron radiation facility, and as such, has several unique timing requirements. Arbitrary Storage Ring filling patterns and high single bunch purity requirements demand a highly stable, low jitter timing system with the flexibility to reconfigure on a pulse-to-pulse basis. This modular system utilizes a highly linear Gauss Clock with ``on the fly`` programmable setpoints to track a free-running Booster ramping magnet and provides digita… more
Date: May 1, 1993
Creator: Fahmie, M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Performance of photocathode rf gun electron accelerators

Description: In Photo-Injectors (PI) electron guns, electrons are emitted from a photocathode by a short laser pulse and then accelerated by intense rf fields in a resonant cavity. The best known advantage of this technique is the high peak current with a good emittance (high brightness). This is important for short wavelength Free-Electron Lasers and linear colliders. PIs are in operation in many electron accelerator facilities and a large number of new guns are under construction. Some applications have e… more
Date: July 1, 1993
Creator: Ben-Zvi, Ilan
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

An improved thermionic microwave gun and emittance-preserving transport line

Description: The positron/electron linac for the Advanced Photon Source (APS) at Argonne National Laboratory can be used to accelerate electrons to 650 MeV. As part of a project to use this linac to test the quality of insertion devices, work has been done to develop a higher-brightness thermionic microwave gun of the SSRL type. The new gun design has smaller emittance by a factor of 3 to 4. The ratio of cathode field to maximum surface field is more than doubled. The new alpha-magnet-based transport line d… more
Date: July 1, 1993
Creator: Borland, M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

A flat-cathode thermionic injector for the PHERMEX Radiographic Facility

Description: The PHERMEX (Pulsed High-Energy Radiographic Machine Emitting X-rays) standing-wave linear accelerator is a high-current electron beam generator used for flash-radiography. An improved electron gun has been designed employing a flat-thermionic cathode to replace the existing Pierce-geometry gun. The flat cathode yields increased current with the same applied voltage and cathode area as the Pierce gun. The ISIS code simulations indicate a beam current of 1.5 kA at 600 kV. The new geometry also r… more
Date: June 1, 1993
Creator: Kauppila, T.; Builta, L.; Burns, M.; Gregory, W.; Honaberger, D.; Watson, S. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Integrated numerical modeling of a laser gun injector

Description: CEBAF is planning to incorporate a laser gun injector into the linac front end as a high-charge cw source for a high-power free electron laser and nuclear physics. This injector consists of a DC laser gun, a buncher, a cryounit and a chicane. The performance of the injector is predicted based on integrated numerical modeling using POISSON, SUPERFISH and PARMELA. The point-by-point method incorporated into PARMELA by McDonald is chosen for space charge treatment. The concept of ``conditioning fo… more
Date: June 1, 1993
Creator: Liu, H.; Benson, S.; Bisognano, J.; Liger, P.; Neil, G.; Neuffer, D. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Heavy Ion Fusion Injector Program

Description: A program is underway to construct a 2 MV, 800 mA, K{sup +} injector for heavy ion fusion. The Electrostatic Quadrupole (ESQ) injector configuration consists of a zeolite source, a diode of up to 1 MV, together with several electrostatic quadrupole units to simultaneously focus and accelerate the beam to 2 MV. The key issues of source technology, high voltage breakdown, beam aberrations, and transient effects will be discussed. Results from ongoing experiments and simulations will be presented.
Date: May 1, 1993
Creator: Yu, S.; Eylon, S. & Chupp, W. W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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RF phase stabilization for RF photocathode gun through electro-optical monitoring

Description: An electro-optical technique is being developed at the Brookhaven National Laboratory (BNL) Accelerator Test Facility (ATF) to monitor and control the phase of the photocathode laser beam with respect to the RF drive field for the RF photocathode gun. This technique utilizes the RF field induced birefringence which is probed by the photocathode laser beam. A proof-of-principle experiment is described which has been performed using the ATF RF photocathode gun injection system for the linac.
Date: August 1, 1993
Creator: Leung, K. P.; Yu, L. H. & Ben-Zvi, Ilan
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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The ALS Gun Electronics system

Description: The ALS Gun Electronics system has been designed to accommodate gun with a custom made socket and high speed electronics circuit which is capable of producing single and multiple electron bunches with time jitters measured at better than 50 PS. The system generates the gated RF signal at ground level before sending it up to the 120 KV-biased gun deck via a fiber optic cable. The current pulse width as a function of grid bias, using an Eimac 8847A planar triode simulating an electron gun, was me… more
Date: May 1, 1993
Creator: Lo, C. C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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The ALS Gun Electronics system

Description: The ALS Gun Electronics system has been designed to accommodate gun with a custom made socket and high speed electronics circuit which is capable of producing single and multiple electron bunches with time jitters measured at better than 50 PS. The system generates the gated RF signal at ground level before sending it up to the 120 KV-biased gun deck via a fiber optic cable. The current pulse width as a function of grid bias, using an Eimac 8847A planar triode simulating an electron gun, was me… more
Date: May 1, 1993
Creator: Lo, C. C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Control, timing, and data acquisition for the Argonne Wakefield Accelerator (AWA)

Description: The AWA is a new facility primarily designed for wakefield acceleration experiments at the 100 MV/m scale, which incorporates a high current linac and rf photocathode electron source, a low emittance rf electron gun for witness beam generation, and associated beamlines and diagnostics. The control system is based on VME and CA-MAC electronics interfaced to a high performance work-station and provides some distributed processing capability. In addition to the control of linac rf, laser optics, a… more
Date: August 1, 1993
Creator: Schoessow, P.; Ho, C.; Power, J. & Chojnacki, E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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The UV-FEL at the NSLS: Straight injection configuration

Description: We present a design of a colinear RF-photocathode gun and linac sections for the ultraviolet free-electron laser under study at the National Synchrotron Light Source. Inverse Helmholtz solenoid pair is used to control the divergence of the electron beam and present a slightly convergent and small beam into a conventional SLAC linac. The relative distance of the gun to the linac and the strength of the solenoidal field are chosen to minimize the emittance growth of the beam due to space charge. … more
Date: July 1, 1993
Creator: Zhang, Xiaohao & Gallardo, Juan C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Polarized source performance in 1992 for SLC--SLD

Description: In its initial operation, the SLC Polarized Electron Source successfully met the SLC goals for 1992 for intensity and efficiency. However, the stability of the beam at the source was marginal, and the polarization was only [approximately]28%. The SLC goal to provide > 10,000 Z events for the SLD from polarized electrons was met.
Date: February 1, 1993
Creator: Schultz, D.; Alley, R.; Clendenin, J.; Frisch, J.; Garden, C.; Hoyt, E. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

A 50-MeV mm-wave electron linear accelerator system for production of tunable short wavelength synchrotron radiation

Description: The Advanced Photon Source (APS) at Argonne in collaboration with the University of Illinois at Chicago and the University of Wisconsin at Madison is developing a new millimeter wavelength, 50-MeV electron linear accelerator system for production of coherent tunable wavelength synchrotron radiation. Modern micromachining techniques based on deep etch x-ray lithography, LIGA (Lithografie, Galvanoformung, Abformung), capable of producing high-aspect ratio structures are being considered for the f… more
Date: December 31, 1993
Creator: Nassiri, A.; Kustom, R. L.; Mills, F. E.; Kang, Y. W.; Matthews, P. J.; Grudzien, D. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Polarization Developments

Description: Recent developments in laser-driven photoemission sources of polarized electrons have made prospects for highly polarized electron beams in a future linear collider very promising. This talk discusses the experiences with the SLC polarized electron source, the recent progress with research into gallium arsenide and strained gallium arsenide as a photocathode material, and the suitability of these cathode materials for a future linear collider based on the parameters of the several linear collid… more
Date: July 1, 1993
Creator: Prescott, Charles Y.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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The Advanced Light Source (ALS) Radiation Safety System. Revised

Description: The Advanced Light Source (ALS) at the Lawrence Berkeley Laboratory (LBL) is a 1.5 Gev synchrotron light source facility consisting of a 120 kev electron gun, 50 Mev linear accelerator, 1.5 Gev booster synchrotron, 200 meter circumference electron storage ring, and many photon beamline transport systems for research. Figure 1. ALS floor plan. Pairs of neutron and gamma radiation monitors are shown as dots numbered from 1 to 12. The Radiation Safety System for the ALS has been designed and built… more
Date: August 1, 1993
Creator: Ritchie, A. L.; Oldfather, D. E. & Lindner, A. F.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Photocathode performance measurements for the SLC polarized electron gun

Description: A low-voltage test system is used to qualify various III-V semiconductor materials as photocathodes for the SLC. The system features a load lock to introduce samples, high pumping speed, a sensitive residual gas analyzer, and an infrared temperature detector. Heat cleaning, cesiation, and oxidation procedures have been studied to optimize cathode activation for achieving an optimum NEA surface. VGF GaAs, MBE-grown AlGaAs, MBE GaAs layered on AlGaAs, and MOCVD GaAsP cathodes with different activ… more
Date: April 1, 1993
Creator: Garden, C. L.; Hoyt, E. W.; Schultz, D. C. & Tang, H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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