PAC2013 - List of Authors (Rahman, O.H.)

Paper	Title	Page
TUPSM06	The Cathode Preparation Chamber for the DC High Current High Polarization Gun	640
	O.H. Rahman, I. Ben-Zvi, D.M. Gassner, A.I. Pikin, T. Rao, E.J. Riehn, B. Sheehy, J. Skaritka, E. Wang, Q. Wu BNL, Upton, Long Island, New York, USA I. Ben-Zvi Stony Brook University, Stony Brook, USA
	Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy. A compact cathode preparation chamber for the high current high polarization gun for the proposed eRHIC project has been designed and assembled at Brookhaven National Laboratory. This preparation chamber will be used to activate GaAs photocathodes to be used in the Gatling gun. The chamber is capable of achieving XHV on a consistent basis. Bulk GaAs samples were activated in this chamber with standard QE for the respective wavelength. In this paper, we discuss the design of this vacuum system, the heat cleaning and the activation procedure for the GaAs sample which will eventually be followed for the Gatling gun.

TUPSM08	Beam Dynamics of Funneling Multiple Bunches Electrons	646
	E. Wang, I. Ben-Zvi, D.M. Gassner, W. Meng, O.H. Rahman, T. Rao, E.J. Riehn, J. Skaritka BNL, Upton, Long Island, New York, USA
	Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy. The proposed electron ion collider (eRHIC) at Brookhaven National Laboratory requires a polarized electron source with high average current, short bunch length, and small emittance. The-state-of-the-art single polarized electron photocathode is far from delivering the required 50mA current due to ion back-bombardment limiting the cathode’s lifetime and surface charge limit. In our funneling gun design, currently under construction, the electron bunches, generated from 20 photocathodes in a 220 kV DC gun, funnel to a single common beam axis. This article details our design of a high-average-current polarized electron gun’s optics, and presents our simulation of beam dynamics and combiner design. We also report the progress of funneling gun construction here.

Paper

Title

Page

The Cathode Preparation Chamber for the DC High Current High Polarization Gun

640

O.H. Rahman, I. Ben-Zvi, D.M. Gassner, A.I. Pikin, T. Rao, E.J. Riehn, B. Sheehy, J. Skaritka, E. Wang, Q. Wu
BNL, Upton, Long Island, New York, USA
I. Ben-Zvi
Stony Brook University, Stony Brook, USA

Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
A compact cathode preparation chamber for the high current high polarization gun for the proposed eRHIC project has been designed and assembled at Brookhaven National Laboratory. This preparation chamber will be used to activate GaAs photocathodes to be used in the Gatling gun. The chamber is capable of achieving XHV on a consistent basis. Bulk GaAs samples were activated in this chamber with standard QE for the respective wavelength. In this paper, we discuss the design of this vacuum system, the heat cleaning and the activation procedure for the GaAs sample which will eventually be followed for the Gatling gun.

TUPSM08

Beam Dynamics of Funneling Multiple Bunches Electrons

646

E. Wang, I. Ben-Zvi, D.M. Gassner, W. Meng, O.H. Rahman, T. Rao, E.J. Riehn, J. Skaritka
BNL, Upton, Long Island, New York, USA

Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
The proposed electron ion collider (eRHIC) at Brookhaven National Laboratory requires a polarized electron source with high average current, short bunch length, and small emittance. The-state-of-the-art single polarized electron photocathode is far from delivering the required 50mA current due to ion back-bombardment limiting the cathode’s lifetime and surface charge limit. In our funneling gun design, currently under construction, the electron bunches, generated from 20 photocathodes in a 220 kV DC gun, funnel to a single common beam axis. This article details our design of a high-average-current polarized electron gun’s optics, and presents our simulation of beam dynamics and combiner design. We also report the progress of funneling gun construction here.