| Paper |
Title |
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| TUPMS085 |
Photoemission Tests of a Pb/Nb Superconducting Photoinjector
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1365 |
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- J. Smedley, T. Rao
BNL, Upton, Long Island, New York
- J. Iversen, D. Klinke, D. Kostin, W.-D. Moller, A. Muhs, J. S. Sekutowicz
DESY, Hamburg
- P. Kneisel
Jefferson Lab, Newport News, Virginia
- R. S. Lefferts, A. R. Lipski
SBUNSL, Stony Brook, New York
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Funding: This work has been partially supported by the EU Commission, contract no. 011935 EUROFEL-DS5, US DOE under contract number DE-AC02-98CH10886.
We report recent progress in the development of a hybrid lead/niobium superconducting (SC) injector. The goal of this effort is to produce an all-SC injector with the SCRF properties of a niobium cavity along with the superior quantum efficiency (QE) of a lead photocathode. Two prototype hybrid injectors have been constructed, one utilizing a cavity with a removable cathode plug, and a second consisting of an all-niobium cavity arc-deposited with lead in the cathode region. We present the results of QE measurements on these cavities, along with tests of the effect of the laser on the cavity RF performance.
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| TUPMS089 |
Thermal Emittance Measurement Design for Diamond Secondary Emission
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1374 |
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- Q. Wu, I. Ben-Zvi, A. Burrill, X. Chang, D. Kayran, T. Rao, J. Smedley
BNL, Upton, Long Island, New York
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Thermal emittance is a very important characteristic of cathodes. A lower thermal emittance cathode has a better performance in limiting emittance for transport down the beam line. A diamond amplified photocathode, being a negative electron affinity (NEA) cathode, promises to deliver a very small thermal emittance. A carefully designed method of measuring the emittance of secondary emission from diamond is presented for the first time. Comparison of possible schemes is carried out by simulation, and the most accessible and accurate method and values are chosen. Systematic errors can be controlled within a very small range, and are carefully evaluated. Aberration and limitations of all equipment are taken into account.
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| WEOCC04 |
Recent Progress on the Diamond Amplified Photo-cathode Experiment
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2044 |
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- X. Chang, I. Ben-Zvi, A. Burrill, J. G. Grimes, T. Rao, Z. Segalov, J. Smedley
BNL, Upton, Long Island, New York
- Q. Wu
IUCF, Bloomington, Indiana
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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 measurement system for the DAP has been designed, constructed and is ready for use. The capsule design of the DAP is also being studied in parallel.
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Slides
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| TUPMN021 |
Status of Nb-Pb Superconducting RF-Gun Cavities
|
962 |
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- J. S. Sekutowicz, J. Iversen, D. Klinke, D. Kostin, W.-D. Moller, A. Muhs
DESY, Hamburg
- M. Ferrario
INFN/LNF, Frascati (Roma)
- P. Kneisel
Jefferson Lab, Newport News, Virginia
- K. Ko, Z. Li, L. Xiao
SLAC, Menlo Park, California
- R. S. Lefferts, A. R. Lipski
SBUNSL, Stony Brook, New York
- T. Rao, J. Smedley
BNL, Upton, Long Island, New York
- P. Strzyzewski
The Andrzej Soltan Institute for Nuclear Studies, Centre Swierk, Swierk/Otwock
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We report on the progress in the status of an electron RF-gun made of two superconductors: niobium and lead. The presented design combines the advantages of the RF performance of bulk niobium superconducting cavities and the reasonably high quantum efficiency of lead. Measured values of quantum efficiency for lead at 2K and the RF-performance of three half-cell niobium cavities with the lead spot exposed to high electric fields are reported in this contribution.
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| TUPMS076 |
Status of R&D Energy Recovery Linac at Brookhaven National Laboratory
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1347 |
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- V. Litvinenko, J. Alduino, D. Beavis, I. Ben-Zvi, M. Blaskiewicz, J. M. Brennan, A. Burrill, R. Calaga, P. Cameron, X. Chang, K. A. Drees, G. Ganetis, D. M. Gassner, J. G. Grimes, H. Hahn, L. R. Hammons, A. Hershcovitch, H.-C. Hseuh, A. K. Jain, D. Kayran, J. Kewisch, R. F. Lambiase, D. L. Lederle, C. Longo, G. J. Mahler, G. T. McIntyre, W. Meng, T. C. Nehring, B. Oerter, C. Pai, D. Pate, D. Phillips, E. Pozdeyev, T. Rao, J. Reich, T. Roser, T. Russo, Z. Segalov, J. Smedley, K. Smith, J. E. Tuozzolo, G. Wang, D. Weiss, N. Williams, Q. Wu, K. Yip, A. Zaltsman
BNL, Upton, Long Island, New York
- H. Bluem, M. D. Cole, A. J. Favale, D. Holmes, J. Rathke, T. Schultheiss, A. M.M. Todd
AES, Princeton, New Jersey
- B. W. Buckley
CLASSE, Ithaca
- G. Citver
Stony Brook University, StonyBrook
- J. R. Delayen, L. W. Funk, H. L. Phillips, J. P. Preble
Jefferson Lab, Newport News, Virginia
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Funding: Work performed under the auspices of the U. S. Department of Energy and partially funded by the US Department of Defence.
In this paper we present status and plans for the 20-MeV R&D energy recovery linac, which is under construction at Collider Accelerator Department at BNL. The facility is based on high current (up to 0.5 A of average current) super-conducting 2.5 MeV RF gun, single-mode super-conducting 5-cell RF linac and about 20-m long return loop with very flexible lattice. The R&D ERL, which is planned for commissioning in 2008, aims to address many outstanding questions relevant for high current, high brightness energy-recovery linacs.
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| WEOCKI03 |
Status of the R&D Towards Electron Cooling of RHIC
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1938 |
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- I. Ben-Zvi, J. Alduino, D. S. Barton, D. Beavis, M. Blaskiewicz, J. M. Brennan, A. Burrill, R. Calaga, P. Cameron, X. Chang, K. A. Drees, A. V. Fedotov, W. Fischer, G. Ganetis, D. M. Gassner, J. G. Grimes, H. Hahn, L. R. Hammons, A. Hershcovitch, H.-C. Hseuh, D. Kayran, J. Kewisch, R. F. Lambiase, D. L. Lederle, V. Litvinenko, C. Longo, W. W. MacKay, G. J. Mahler, G. T. McIntyre, W. Meng, B. Oerter, C. Pai, G. Parzen, D. Pate, D. Phillips, S. R. Plate, E. Pozdeyev, T. Rao, J. Reich, T. Roser, A. G. Ruggiero, T. Russo, C. Schultheiss, Z. Segalov, J. Smedley, K. Smith, T. Tallerico, S. Tepikian, R. Than, R. J. Todd, D. Trbojevic, J. E. Tuozzolo, P. Wanderer, G. Wang, D. Weiss, Q. Wu, K. Yip, A. Zaltsman
BNL, Upton, Long Island, New York
- D. T. Abell, G. I. Bell, D. L. Bruhwiler, R. Busby, J. R. Cary, D. A. Dimitrov, P. Messmer, V. H. Ranjbar, D. S. Smithe, A. V. Sobol, P. Stoltz
Tech-X, Boulder, Colorado
- A. V. Aleksandrov, D. L. Douglas, Y. W. Kang
ORNL, Oak Ridge, Tennessee
- H. Bluem, M. D. Cole, A. J. Favale, D. Holmes, J. Rathke, T. Schultheiss, J. J. Sredniawski, A. M.M. Todd
AES, Princeton, New Jersey
- A. V. Burov, S. Nagaitsev, L. R. Prost
Fermilab, Batavia, Illinois
- Y. S. Derbenev, P. Kneisel, J. Mammosser, H. L. Phillips, J. P. Preble, C. E. Reece, R. A. Rimmer, J. Saunders, M. Stirbet, H. Wang
Jefferson Lab, Newport News, Virginia
- V. V. Parkhomchuk, V. B. Reva
BINP SB RAS, Novosibirsk
- A. O. Sidorin, A. V. Smirnov
JINR, Dubna, Moscow Region
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Funding: Work done under the auspices of the US DOE with support from the US DOD.
The physics interest in a luminosity upgrade of RHIC requires the development of a cooling-frontier facility. Detailed cooling calculations have been made to determine the efficacy of electron cooling of the stored RHIC beams. This has been followed by beam dynamics simulations to establish the feasibility of creating the necessary electron beam. Electron cooling of RHIC at collisions requires electron beam energy up to about 54 MeV at an average current of between 50 to 100 mA and a particularly bright electron beam. The accelerator chosen to generate this electron beam is a superconducting Energy Recovery Linac (ERL) with a superconducting RF gun with a laser-photocathode. An intensive experimental R&D program engages the various elements of the accelerator: Photocathodes of novel design, superconducting RF electron gun of a particularly high current and low emittance, a very high-current ERL cavity and a demonstration ERL using these components.
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Slides
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| THPAS020 |
3D Simulations of Secondary Electron Generation and Transport in a Diamond Amplifier for Photocathodes
|
3555 |
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- D. A. Dimitrov, D. L. Bruhwiler, R. Busby, J. R. Cary
Tech-X, Boulder, Colorado
- I. Ben-Zvi, X. Chang, T. Rao, J. Smedley, Q. Wu
BNL, Upton, Long Island, New York
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The Relativistic Heavy Ion Collider (RHIC) contributes fundamental advances to nuclear physics by colliding a wide range of ions. A novel electron cooling section, which is a key component of the proposed luminosity upgrade for RHIC, requires the acceleration of high-charge electron bunches with low emittance and energy spread. A promising candidate for the electron source is the recently developed concept of a high quantum efficiency photoinjector with a diamond amplifier. We have started to implement algorithms, within the VORPAL particle-in-cell framework, for modeling of secondary electron and hole generation, and for charge transport in diamond. The algorithms include elastic and various inelastic scattering processes over a wide range of charge carrier energies. Initial results from the implemented capabilities will be presented and discussed.
The work at Tech-X Corp. is supported by the U. S. Department of Energy under a Phase I SBIR grant.
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