Status of proof-of-principle experiment of coherent electron cooling at BNL
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43 PARTICLE ACCELERATORS↗
Engineering topics
Sheehy, B.
Publications and source records attributed to Sheehy, B..
First beam commissioning at BNL ERL SRF Gun
The 704 MHz SRF gun successfully generated the first photoemission beam in November of 2014. The configurations of the test and the sub-systems are described.The latest results of SRF commissioning, including the cavity performance, cathode QE measurements, beam current/energy measurements, are presented in the paper.
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The progress of funnelling gun high voltage condition and beam test
A prototype of a high average current polarized electron funneling gun as an eRHIC injector has been built at BNL. The gun was assembled and tested at Stangenes Incorporated. Two beams were generated from two GaAs photocathodes and combined by a switched combiner field. We observed the combined beams on a YAG crystal and measured the photocurrent by a Faraday cup. The gun has been shipped to Stony Brook University and is being tested there. In this paper we will describe the major components of the gun and recent beam test results. High voltage conditioning is discussed as well.
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Cathode performance during two beam operation of the high current high polarization electron gun for eRHIC
Two electron beams from two activated bulk GaAs photocathodes were successfully combined during the recent beam test of the High Current High Polarization Electron gun for eRHIC. The beam test took place in Stangenes Industries in Palo Alto, CA, where the cathodes were placed in diagonally opposite locations inside the high voltage shroud. No significant cross talking between the cathodes was found for the pertinent vacuum and low average current operation, which is very promising towards combining multiple beams for higher average current. This paper describes the cathode preparation, transport and cathode performance in the gun for the combining test, including the QE and lifetimes of the photocathodes at various steps of the experiment.
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Infrared diagnostics instrumentation design for the coherent electron cooling proof of principle experiment
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Present status if coherent electron cooling proof-of-principle experiment
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Depressed electron collector for the Gatling Gun Test Stand
An optical solution for, and the general design of an electron collector (EC) for a Gatling gun Test Stand are described. The purposes of this development were to reduce the power load on the electron gun’s high-voltage power supply, and to eliminate the back-streaming of electrons from the dump into the ultra-high-vacuum region of the beam line and the gun chamber, thereby preventing vacuum degradation. The challenge is solved by creating an effective biased “black box” on the cathode terminal for all electrons, and by assuring the vacuum separation of the EC’s volume from the beam line.
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