| Paper |
Title |
Page |
| WG1000 |
ERL2011 Summaries of Working Group 1 |
10 |
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- B.M. Dunham
CLASSE, Ithaca, New York, USA
- A. Arnold
HZDR, Dresden, Germany
- S.A. Belomestnykh, T. Rao
BNL, Upton, Long Island, New York, USA
- S.V. Benson, C. Hernandez-Garcia, R. Suleiman
JLAB, Newport News, Virginia, USA
- D.C. Nguyen
LANL, Los Alamos, New Mexico, USA
- N. Nishimori
JAEA, Ibaraki-ken, Japan
- T. Quast
HZB, Berlin, Germany
- M. Yamamoto
KEK, Ibaraki, Japan
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Slides WG1000 [0.035 MB]
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WG1001 |
Status of Superconducting RF Guns at BNL |
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- S.A. Belomestnykh
BNL, Upton, Long Island, New York, 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. Work at Stony Brook University is supported under grant DE-SC0005713 with the U.S. DOE.
Two superconducting RF guns are under active development at BNL. The first gun is of an elliptical shape. It operates at 704 MHz and is designed to produce high average current electron beams for the ERL prototype. The second gun of a quarter-wave resonator type, operating at 112 MHz. This gun is planned to be used for photocathode studies and to generate high charge, low repetition rate beam for the coherent electron cooling experiment. In this talk we will briefly describe the gun designs, present recent test results and the status and discuss plans.
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Slides WG1001 [2.224 MB]
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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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WG3026 |
Development of Antenna-type HOM Couplers at BNL |
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- S.A. Belomestnykh
BNL, Upton, Long Island, New York, USA
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Antenna-type HOM coupler are being developed at BNL for future ERLs of eRHIC. The couplers use high pass filters to prevent unwanted loading of the fundamental mode. Two designs are under considerations: one employing coaxial-line-based filter and one employing a waveguide filter. We will report results of recent simulations.
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Slides WG3026 [1.212 MB]
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WG3031 |
Fundamental Power Couplers for the ERL Prototype SRF Gun at BNL |
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- S.A. Belomestnykh
BNL, Upton, Long Island, New York, USA
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A coaxial antenna 500-kW CW FPCs were developed for the SRF gun of the ERL prototype. Track3P code was used for simulations of multipacting, producing results that are in excellent agreement with zones later observed experimentally. We will report results of simulations and conditioning of FPCs.
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Slides WG3031 [1.683 MB]
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