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RTA gun performance

Description: The technical challenge for making two-beam accelerators into realizable power sources for high-energy colliders lie in the creation of the drive beam and in its propagation over long distances through multiple extraction sections. This year we have constructed a 1.2-kA, 1-MeV, electron induction injector for the RTA accelerator. The electron source will be a 8.9 cm diameter, thermionic, flat-surface cathode with a maximum shroud field stress of approximately 165 kV/cm. The injector� s pulse le… more
Date: August 10, 1998
Creator: Andersen, D. E.; Eylon, S.; Henestroza, E.; Houck, T. L.; Lidia, S. M.; Vanecek, D. L. et al.
Partner: UNT Libraries Government Documents Department
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Proof-of-principle Experiment of a Ferroelectric Tuner for the 1.3 GHz Cavity

Description: A novel tuner has been developed by the Omega-P company to achieve fast control of the accelerator RF cavity frequency. The tuner is based on the ferroelectric property which has a variable dielectric constant as function of applied voltage. Tests using a Brookhaven National Laboratory (BNL) 1.3 GHz electron gun cavity have been carried out for a proof-of-principle experiment of the ferroelectric tuner. Two different methods were used to determine the frequency change achieved with the ferroele… more
Date: January 1, 2009
Creator: Choi,E.M.; Hahn, H.; Shchelkunov, S. V.; Hirshfield, J. & Kazakov, S.
Partner: UNT Libraries Government Documents Department
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PPM focused X-band klystron development at the Stanford Linear Accelerator Center

Description: X-band klystrons capable of 50 MW and utilizing Periodic Permanent Magnet (PPM) focusing are undergoing design and fabrication at the Stanford Linear Accelerator Center (SLAC). The klystron development is part of an effort to realize components necessary for the construction of the Next Linear Collider (NLC). The first klystron to be tested this year has a 0.6 microK beam at 465 kV, a 5 cells traveling wave output structure and a predicted efficiency of 63%. A 465 kV, 190 A beam stick with 12 p… more
Date: July 1, 1996
Creator: Sprehn, D.; Caryotakis, G.; Eppley, K. & Phillips, R. M.
Partner: UNT Libraries Government Documents Department
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Engineering Design and Fabrication of an Ampere-Class Superconducting Photocathode Electron Gun

Description: Over the past three years, Advanced Energy Systems and Brookhaven National Laboratory (BNL) have been collaborating on the design of an Ampere- class superconducting photocathode electron gun. BNL performed the physics design of the overall system and RF cavity under prior programs. Advanced Energy Systems (AES) is currently responsible for the engineering design and fabrication of the electron gun under contract to BNL. We will report on the engineering design and fabrication status of the sup… more
Date: November 17, 2008
Creator: Ben-Zvi, Ilan
Partner: UNT Libraries Government Documents Department
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Summary report of working group 5: Beam and radiation generation, monitoring, and control

Description: This paper summarizes the activities and presentations of Working Group 5 of the Advanced Accelerator Concepts Workshop held at Annapolis, Maryland in June 2010. Working Group 5 touched on a broad range of topics in the fields of beam and radiation generation and their monitoring and control. These topics were not comprehensively covered in this Workshop, but rather the Working Group concentrated on specific new developments and recent investigations. The Working Group divided its sessions into… more
Date: January 1, 2010
Creator: Church, Mike & Kim, Ki-Yong
Partner: UNT Libraries Government Documents Department
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Experience at Fermilab with high quantum efficiency photo-cathodes for rf electron guns

Description: As part of the A0 Photo-injector collaboration at Fermi-lab [1, 2] and the TeSLA collaboration [3], a high bright-ness, low emittance electron source has been developed. In the process, a system was constructed for coating molybde-num cathodes with a layer of cæsium telluride (Cs2 Te), a photo-emissive material of high quantum efficiency (QE). The use of Cs2 Te was first investigated at CERN [4] and LANL [5]. The development of the systems for the TeSLA Test Facility Linac and the Fermilab Phot… more
Date: October 1998
Creator: Fry, A.; Hahn, E.; Hartung, W.; Kuchnir, M.; Michelato, P. & Sertore, D.
Partner: UNT Libraries Government Documents Department
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A Gridded Electron Gun for a Sheet Beam Klystron

Description: This paper describes the development of an electron gun for a sheet beam klystron. Initially intended for accelerator applications, the gun can operate at a higher perveance than one with a cylindrically symmetric beam. Results of 2D and 3D simulations are discussed.
Date: April 25, 2008
Creator: Read, M. E.; Miram, G.; Ives, R. L.; Ivanov, V. & Krasnykh, A.
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.
Partner: UNT Libraries Government Documents Department
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High power test of the first s-band rf gun at SRRC.

Description: We had constructed an S-band high power rf system at SRRC (Synchrotron Radiation Research Center). It will be used as a test bench of various designs of S-band rf guns. A 2856 MHz PFN (Pulse Forming Network) system was built to deliver 2 {micro}s, 40KV voltage pulse at 10Hz repetition rate for the XK-5 Klystron. As a quick start, we had fabricated a 2856MHz single cell rf gun for the high power test. The recent results are reported.
Date: July 23, 2001
Creator: Ho, C. H.; Chang, S. S.; Chiou, J. P.; Fann, C. S.; Hsu, K. T.; Hsu, S. Y. et al.
Partner: UNT Libraries Government Documents Department
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Relativistic Klystron Two-Beam Accelerator studies at the RTA test facility

Description: A prototype rf power source based on the Relativistic Klystron Two- Beam Accelerator (RK-TBA) concept is being constructed at LBNL to study physics, engineering, and costing issues. The prototype, called RTA, is described and compared to a full scale design appropriate for driving the Next Linear Collider. Specific details of the induction core test and pulsed power system are presented. Details of the 1-MeV, 1.2-kA induction gun currently under construction are described.
Date: August 16, 1996
Creator: Westenskow, G.A.; Houck, T.L. & Anderson, D.
Partner: UNT Libraries Government Documents Department
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Pulsed WIP electron gun. Final report: design phase 1 x 70 cm cooled WIP electron gun, 1 December 1978--2 February 1979

Description: Presented here are design criteria for a full scale (70 cm) WIP electron gun system capable of long run operation with the following specifications: foil area approx. 70 x 1 cm, electron beam current density approx. 1 A/cm/sup 2/, pulse length < 200 ns FWHM, pulse tail < 25f f pulse energy, average current approx. 2 ma/cm/sup 2/, voltage -150 kV, voltage droop < 10%, Rep rate approx. 10 KHz, power approx. 20 kW, run time approx. 30 min, and jitter approx. 10 ..mu..s.
Date: January 1, 1979
Creator: Wakalopulos, G. & Gresko, L.
Partner: UNT Libraries Government Documents Department
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Tearing and MHD Instability During Gun Injection into a Spheromak

Description: Linear stability analysis of a two-cylinder approximation to gun injection--one cylinder to represent the confined spheromak and another to represent the gun--is shown to yield equilibria in which tearing modes exist simultaneously at the magnetic axis and at the geometric (gun) axis, as might be required to sustain helicity injection. These equilibria are MHD stable at the two axes but may have localized MHD instability at an interior minimum in the q profile. The theory predicts two tearing t… more
Date: May 11, 2000
Creator: Fowler, T K
Partner: UNT Libraries Government Documents Department
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Survey of SRF guns

Description: Developing Superconducting RF (SRF) electron guns is an active field with several laboratories working on different gun designs. While the first guns were based on elliptic cavity geometries, Quarter Wave Resonator (QWR) option is gaining popularity. QWRs are especially well suited for producing beams with high charge per bunch. In this talk we will describe recent progress in developing both types of SRF guns. SRF guns made excellent progress in the last two years. Several guns generated beams… more
Date: July 25, 2011
Creator: Belomestnykh, S.
Partner: UNT Libraries Government Documents Department
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Design of a 1-MV induction injector for the Relativistic Klystron Two-Beam Accelerator

Description: A Relativistic Klystron Two-Beam Accelerator (RK-TBA) is envisioned as a rf power source upgrade of the Next Linear Collider. Construction of a prototype, called the RTA, based on the RK-TBA concept has commenced at the Lawrence Berkeley National Laboratory. This prototype will be used to study physics, engineering, and costing issues involved in the application of the RK-TBA concept to linear colliders. The first half of the injector, a 1 MeV, 1.2 kA, 300 ns induction electron gun, has been bu… more
Date: May 1, 1997
Creator: Anderson, D.E.; Eylon, S.; Lidia, S.; Reginato, L.; Vanecek, D.; Yu, S. et al.
Partner: UNT Libraries Government Documents Department
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Performance of magnesium cathode in the S-band RF gun

Description: In this paper, the authors present the preliminary results of the performance of magnesium cathode in a high frequency RF gun. The quantum efficiency of Mg showed a dramatic improvement upon laser cleaning, increasing from 10{sup {minus}5} to 4 {times} 10{sup {minus}4} after two hours of cleaning, and to 2 {times} 10{sup {minus}3} after systematic cleaning. The cleaning procedure for this increase is described in detail. Charge measured as a function of the laser injection phase relative to the… more
Date: May 1, 1997
Creator: Srinivasan-Rao, T.; Ben-Zvi, Ilan; Smedley, J.; Wang, X. J.; Woodle, M.; Palmer, D. T. et al.
Partner: UNT Libraries Government Documents Department
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Emittance Studies of the BNL/SLAC/UCLA 1.6 Cell Photocathode rf Gun

Description: The symmetrized 1.6 cell S-band photocathode gun developed by the BNL/SLAC/UCLA collaboration is in operation at the Brookhaven Accelerator Test Facility (ATF). A novel emittance compensation solenoid magnet has also been designed, built and is in operation at the ATF. These two subsystems form an emittance compensated photoinjector used for beam dynamics, advanced acceleration and free electron laser experiments at the ATF. The highest acceleration field achieved on the copper cathode is 150 M… more
Date: July 1997
Creator: Palmer, D. T.; Miller, R. H. & Wang, X. J.
Partner: UNT Libraries Government Documents Department
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150-MW S-band klystron program at the Stanford Linear Accelerator Center

Description: Two S-Band klystrons operating at 150 MW have been designed, fabricated and tested at the Stanford Linear Accelerator Center (SLAC) during the past two years for use in an experimental accelerator at Deutsches Elektronen-Synchrotron (DESY) in Hamburg, Germany. Both klystrons operate at the design power, 60 Hz repetition rate, 3 {micro}s pulsewidth, with an efficiency {gt} 40%, and agreement between the experimental results and simulations is excellent. The 535 kV, 700 A electron gun was tested … more
Date: July 1, 1996
Creator: Sprehn, D.; Caryotakis, G. & Phillips, R. M.
Partner: UNT Libraries Government Documents Department
open access

Progress on the relativistic klystron two-beam accelerator prototype

Description: The technical challenge for making two-beam accelerators into realizable power sources lies in the creation of the drive beam and in its propagation over long distances through multiple extraction sections. This year we have been constructing a 1.2-kA, l-MeV, electron induction prototype injector as a collaborative effort between LBL and LLNL. The electron source will be a 3.5"-diameter, thermionic, flat-surface cathode with a maximum shroud field stress of approximately 165 kV/cm. Additional d… more
Date: July 5, 1998
Creator: Anderson, D. E.; Eylon, S.; Henestroza, E.; Houck, T. L.; Lidia, S. M.; Vanecek, D. L. et al.
Partner: UNT Libraries Government Documents Department
open access

Development of small-bore, high-current-density railgun as testbed for study of plasma-materials interaction. Progress report for October 16,2000 - May 13, 2003

Description: The present document is a final technical report summarizing the progress made during 10/16/2000 - 05/13/2003 toward the development of a small-bore railgun with transaugmentation as a testbed for investigating plasma-materials interaction.
Date: May 14, 2003
Creator: Kim, Kyekyoon (Kevin)
Partner: UNT Libraries Government Documents Department
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Negative Transconductance in Apertured Electron Guns

Description: Passing an electron beam through an aperture can serve to reduce the beam current or change the transverse beam profile. For a sufficiently intense beam, space charge will drive a radial expansion of the beam, which may cause the current passing through the aperture to increase even though the current arriving at the aperture is decreasing. When a gridded electron gun is used, this may be expressed by stating that the transconductance of the apertured gun is negative. Here we explain this effec… more
Date: September 21, 2007
Creator: Harris, J R & O'Shea, P G
Partner: UNT Libraries Government Documents Department
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Recent Progress on the Diamond Amplified Photo-Cathode Experiment.

Description: We report recent progress on the Diamond Amplified Photo-cathode (DAP). The use of a pulsed electron gun provides detailed information about the DAP physics. The secondary electron gain has been measured under various electric fields. We have achieved gains of a few hundred in the transmission mode and observed evidence of emission of electrons from the surface. A model based on recombination of electrons and holes during generation well describes the field dependence of the gain. The emittance… more
Date: June 25, 2007
Creator: Chang,X.; Ben-Zvi, Ilan; Burrill, A.; Grimes, J.; Rao, T.; Segalov, Z. et al.
Partner: UNT Libraries Government Documents Department
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Gridded Electron Guns and Modulation of Intense Beams

Description: Gridded guns are useful for producing modulated electron beams. This modulation is generally limited to simple gating of the beam, but may be used to apply structure to the beam pulse shape. In intense beams, this structure spawns space charge waves whose dynamics depend in part on the relative strengths of the velocity and density variations which comprise the initial current modulation. In this paper, we calculate the strengths of beam current and velocity modulation produced in a gridded ele… more
Date: May 2, 2006
Creator: Harris, J R & O'Shea, P G
Partner: UNT Libraries Government Documents Department
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