| Paper |
Title |
Page |
| TUP040 |
Progress on a Cryogenically Cooled RF Gun Polarized Electron Source
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339 |
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- R. P. Fliller, H. Edwards
Fermilab, Batavia, Illinois
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RF guns have proven useful in multiple accelerator applications. An RF gun capable of producing polarized electrons is an attractive electron source for the ILC or an electron-ion collider. Producing such a gun has proven elusive. The NEA GaAs photocathode needed for polarized electron production is damaged by the vacuum environment in an RF gun. Electron and ion backbombardment can also damage the cathode. These problems must be mitigated before producing an RF gun polarized electron source. In this paper we report continuing efforts to improve the vacuum environment in a normal conducting RF gun by cooling it with liquid Nitrogen after a high temperature vacuum bakeout. We also report on a design of a cathode preparation chamber to produce bulk GaAs photocathodes for testing in such a gun. Future directions are also discussed.
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| TUP092 |
Emittance Exchange at FNPL
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478 |
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- T. W. Koeth
Rutgers University, The State University of New Jersey, Piscataway, New Jersey
- R. Andrews, D. A. Edwards, H. Edwards, R. P. Fliller, M. J. Syphers
Fermilab, Batavia, Illinois
- P. Piot
Northern Illinois University, DeKalb, Illinois
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An experiment to attempt the exchange of the transverse emittance with the longitudinal emittance of the Fermilab/NICADD PhotoInjector electron beam is being developed. The emittance exchange occurs by placing a TM110 mode RF cavity in the maximum dispersive region of a magnetic chicane. Properly employed, the cavity's longitudinal shearing Electric field zeros the momentum spread at the cost of generating a non-zero betatron oscillation amplitude. We report on the beam line modeling, beam line design, the RF cavity design, present status as well as the future program.
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| THP046 |
Status of 3.9-GHz Deflecting-Mode (CRAB) Cavity R&D
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682 |
| |
- L. Bellantoni, H. Edwards, M. Foley, T. K. Khabiboulline, D. V. Mitchell, A. M. Rowe, N. Solyak
Fermilab, Batavia, Illinois
- C. Adolphsen
SLAC, Menlo Park, California
- G. Burt, A. C. Dexter
Cockcroft Institute, Lancaster University, Lancaster
- P. Goudket
CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire
- T. W. Koeth
Rutgers University, The State University of New Jersey, Piscataway, New Jersey
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The superconducting 3.9GHz deflecting mode cavity design which has been under development as a beam slice diagnostic is planned for use as the ILC crab cavity. We describe the applications and review the status of the R & D, giving both prototype test results and computational studies of beam interaction.
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| THP051 |
Status of 3.9-GHz Superconducting RF Cavity Technology at Fermilab
|
695 |
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- H. Edwards, T. T. Arkan, H. Carter, C. A. Cooper, M. Foley, E. R. Harms, T. K. Khabiboulline, D. V. Mitchell, D. O. Olis, A. M. Rowe, N. Solyak, S. Tariq
Fermilab, Batavia, Illinois
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Fermilab is involved in an effort to design, build, test and deliver 3.9 GHz superconducting RF cavities with a goal to deliver one 'third harmonic' cryomodule containing four cavities in early 2007 for use at the DESY TTF III Project. The design gradient of these cavities is 19 MV/m. This effort involves design, fabrication, intermediate testing, assembly, and eventual delivery of the four cavity cryomodule. We report on all facets of this enterprise from design through future plans. Included will be early test results of single 9-cell cavities, lessons learned, and other findings.
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| THP060 |
Capture Cavity II at Fermilab
|
719 |
| |
- T. W. Koeth
Rutgers University, The State University of New Jersey, Piscataway, New Jersey
- J. Branlard, R. H. Carcagno, B. Chase, P. Czarapata, H. Edwards, R. P. Fliller, C. M. Ginsburg, B. M. Hanna, A. Hocker, A. Klebaner, M. J. Kucera, M. McGee, D. F. Orris, P. S. Prieto, J. Reid, J. K. Santucci, W. M. Soyars, C.-Y. Tan
Fermilab, Batavia, Illinois
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Capture Cavity II is a 9-cell high gradient TESLA Superconducting cavity intended to upgrade the existing Fermilab Photoinjector electron beam energy from 15MeV to 40Mev. DESY provided the cavity which performed to 33MV/m. Beam tube component preparation and installation onto the cavity was completed at DESY. The cavity was shipped to FNAL under vacuum. Installation and testing of this cavity has provided an opportunity to demonstrate Fermilab’s SCRF High Power Testing infrastructure. We report on the high power RF tests performed with Capture Cavity II at both 4.5K and 1.8K, Cryogenic System Performance, Piezo Electric based fast tuner, and low level RF control.
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| THP061 |
High Field Test Results of Superconducting 3.9-GHz Accelerating Cavities at FNAL
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722 |
| |
- N. Solyak, H. Edwards, M. Foley, I. G. Gonin, T. K. Khabiboulline, D. V. Mitchell, A. M. Rowe
Fermilab, Batavia, Illinois
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The XFEL facilities are planning to use section with a few third harmonic cavities (3.9GHz) to improve beam performance [1]. Fermilab is developing superconducting third harmonic section for the FLASH(TTF/DESY) upgrade. This section will include four cavities equiped with couplers and blade tuners installed in cryostat. Up to now, two cavities are completed and one of them is under vertical test. The gradient of the cavity was limited by multipactor in HOM coupler. The visual inspection of the HOM couplers after cold tests showed that both couplers were damaged. In paper we discuss the results of vertical tests, multipactoring analysis in HOM coupler and a new design for HOM coupler.
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