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WG1016 |
Progress at BNL Towards Development of Efficient, Robust Photocathodes for High Average Current Operation |
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- T. Rao, S.A. Belomestnykh, I. Ben-Zvi, X. Chang, J. Smedley, E. Wang, Q. Wu
BNL, Upton, Long Island, New York, USA
- X. Liang, M. Ruiz-Osés, T. Xin
Stony Brook University, Stony Brook, USA
- R.R. Mammei, J.L. McCarter, M. Poelker, R. Suleiman
JLAB, Newport News, Virginia, USA
- E.M. Muller
SBU, Stony Brook, New York, USA
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The photocathode research at BNL is proceeding along two parallel paths, characterizing the cathodes as they are being fabricated and testing them in a variety of guns. Using modern surface science techniques such as X-Ray Reflection (XRR), X-Ray Diffraction (XRD) and X-Ray photoemission spectroscopy (XPS), we have investigated Sb and K-Cs-Sb layers as a function of the deposition technique, substrate material and deposition recipes. The talk will cover the latest results of these investigations. Cathode insertion section for the 112 MHz SRF gun is being designed for testing multialkali and diamond secondary emission cathodes. The status of the designs will also be presented. In addition, the multialkali cathode, fabricated at BNL and transported to JLab, has been tested for high current operation in a DC injector at JLab. The performance of this cathode when irradiated 440 nm and 532 nm radiation, under different bias voltages and average currents will be presented.
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Slides WG1016 [4.189 MB]
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WG3001 |
Superconducting RF for Energy Recovery Linacs of eRHIC |
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- S.A. Belomestnykh, H. Hahn, G.J. Mahler, R. Than, W. Xu
BNL, Upton, Long Island, New York, USA
- I. Ben-Zvi
Stony Brook University, Stony Brook, USA
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Funding: Work is supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. DOE.
A six-pass ERL will provide 50-mA electron beam for collisions with hadrons in eRHIC. The two main linacs are based on the BNL-3 704 MHz 5-cell elliptical SRF cavities. At full energy of 30 GeV, the length of each linac will reach 200 m. In addition to the main ERL, two smaller single-pass ERLs will be used as 1) 600-MeV injector into the main ERL, and 2) source of 70-mA electron beam for coherent cooling of the hadron beam. This paper describes the design of the SRF cavity and cryomodule, requirements to for the RF system, and plans for prototyping various components.
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Slides WG3001 [3.687 MB]
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