IPAC2012 - List of Authors (Chang, X.)

Paper	Title	Page
TUPPD082	Simulations of Multipacting in the Cathode Stalk and FPC of 112 MHz Superconducting Electron Gun	1593
	T. Xin, X. Liang Stony Brook University, Stony Brook, USA S.A. Belomestnykh, I. Ben-Zvi, T. Rao, J. Skaritka, E. Wang, Q. Wu BNL, Upton, Long Island, New York, USA X. Chang Far-Tech, Inc., San Diego, California, USA
	Funding: Work is supported at BNL by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. DOE. The work at Stony Brook is supported by the US DOE under grant DE-SC0005713. A 112 MHz superconducting quarter-wave resonator electron gun will be used as the injector of the Coherent Electron Cooling (CEC) proof-of-principle experiment at BNL. Furthermore, this electron gun can be used for testing of the performance of various high quantum efficiency photocathodes. In a previous paper, we presented the design of the cathode stalks and a Fundamental Power Coupler (FPC). In this paper we present updated designs of the cathode stalk and FPC. Multipacting in the cathode stalk and FPC was simulated using three different codes, Multipac, CST particle studio and FishPact respectively. All simulation results show no serious multipacting in the cathode stalk structure and FPC.

THPPC044	Development of the Dual Slot Resonance Linac	3383
	N. Barov, X. Chang, R.H. Miller, D.J. Newsham Far-Tech, Inc., San Diego, California, USA
	Funding: Work supported by DOE Grant DE-FG02-08ER85034 We report the status of the Dual Slot Resonance (DSR) linac under development by FAR-TECH. In this linac type, cell-to-cell coupling is provided by a pair of close-coupled resonant slots, resulting in very strong coupling vs. a typical side-coupled linac design, as well as a much more compact radial space requirement. We discuss the status of the structure fabrication, the RF distribution system, and installation and testing at the UCLA Pegasus facility.

THPPC073	Development of the Energy-Efficient Solid State RF Power Source for the Jefferson Laboratory CEBAF Linac	3455
	X. Chang, N. Barov, D.J. Newsham, D. Wu Far-Tech, Inc., San Diego, California, USA
	Funding: Work supported by DOE Office of Nuclear Physics, DOE-SBIR #DE-SC0002529 We present the current status of FAR-TECH's Solid State RF Power Source for the Jefferson Laboratory CEBAF Linac. This power source design features up to 8 kW CW RF output power, GaN amplifier stages with high efficiency (>60%), and a compact design to fit existing rack space and cooling requirements at the installation site. We have finished most of the designs and have performed successfully the most critical tests of this project, the 4 to 1 combiner test and the cooling test. FAR-TECH’s solid state amplifier design has high efficiency, a wide range of design frequency (DC-3GHz), and long lifetime, which provides a good RF power source.

Paper

Title

Page

Simulations of Multipacting in the Cathode Stalk and FPC of 112 MHz Superconducting Electron Gun

1593

T. Xin, X. Liang
Stony Brook University, Stony Brook, USA
S.A. Belomestnykh, I. Ben-Zvi, T. Rao, J. Skaritka, E. Wang, Q. Wu
BNL, Upton, Long Island, New York, USA
X. Chang
Far-Tech, Inc., San Diego, California, USA

Funding: Work is supported at BNL by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. DOE. The work at Stony Brook is supported by the US DOE under grant DE-SC0005713.
A 112 MHz superconducting quarter-wave resonator electron gun will be used as the injector of the Coherent Electron Cooling (CEC) proof-of-principle experiment at BNL. Furthermore, this electron gun can be used for testing of the performance of various high quantum efficiency photocathodes. In a previous paper, we presented the design of the cathode stalks and a Fundamental Power Coupler (FPC). In this paper we present updated designs of the cathode stalk and FPC. Multipacting in the cathode stalk and FPC was simulated using three different codes, Multipac, CST particle studio and FishPact respectively. All simulation results show no serious multipacting in the cathode stalk structure and FPC.

THPPC044

Development of the Dual Slot Resonance Linac

3383

N. Barov, X. Chang, R.H. Miller, D.J. Newsham
Far-Tech, Inc., San Diego, California, USA

Funding: Work supported by DOE Grant DE-FG02-08ER85034
We report the status of the Dual Slot Resonance (DSR) linac under development by FAR-TECH. In this linac type, cell-to-cell coupling is provided by a pair of close-coupled resonant slots, resulting in very strong coupling vs. a typical side-coupled linac design, as well as a much more compact radial space requirement. We discuss the status of the structure fabrication, the RF distribution system, and installation and testing at the UCLA Pegasus facility.

THPPC073

Development of the Energy-Efficient Solid State RF Power Source for the Jefferson Laboratory CEBAF Linac

3455

X. Chang, N. Barov, D.J. Newsham, D. Wu
Far-Tech, Inc., San Diego, California, USA

Funding: Work supported by DOE Office of Nuclear Physics, DOE-SBIR #DE-SC0002529
We present the current status of FAR-TECH's Solid State RF Power Source for the Jefferson Laboratory CEBAF Linac. This power source design features up to 8 kW CW RF output power, GaN amplifier stages with high efficiency (>60%), and a compact design to fit existing rack space and cooling requirements at the installation site. We have finished most of the designs and have performed successfully the most critical tests of this project, the 4 to 1 combiner test and the cooling test. FAR-TECH’s solid state amplifier design has high efficiency, a wide range of design frequency (DC-3GHz), and long lifetime, which provides a good RF power source.