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| TUPMN021 |
Status of Nb-Pb Superconducting RF-Gun Cavities
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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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| 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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| THOAKI01 |
Advances in Large Grain/Single Crystal SC Resonators at DESY
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2569 |
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- W. Singer, A. Brinkmann, A. Ermakov, J. Iversen, G. Kreps, A. Matheisen, D. Proch, D. Reschke, X. Singer, M. Spiwek, H. Wen
DESY, Hamburg
- P. Kneisel
Jefferson Lab, Newport News, Virginia
- M. Pekeler
ACCEL, Bergisch Gladbach
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The main aim of the DESY large grain R&D program is to check whether this option is reasonable to apply for fabrication of ca. 1'000 XFEL cavities. Two aspects are being pursued. On one hand the basic material investigation, on the other hand the material availability, fabrication and preparation procedure. Several single cell large grain cavities of TESLA shape have been fabricated and tested. The best accelerating gradients of 41 MV/m was measured on electropolished cavity. First large grain nine-cell cavities worldwide have been produced under contract of DESY with ACCEL Instruments Co. All three cavities fulfil the XFEL specification already in first RF test after only BCP (Buffered Chemical Polishing) treatment and 800 degrees C annealing. Accelerating gradient of 27 - 29 MV/m was reached. A fabrication method of single crystal cavity of ILC like shape was proposed. A single cell single crystal cavity was build at the company ACCEL. Accelerating gradient of 37.5 MV/m reached after only 112 microns BCP and in situ baking 120 degrees C for 6 hrs with the quality factor higher as 2x1010. The developed method can be extended on fabrication of multi cell single crystal cavities.
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Slides
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