PAC2013 - List of Authors (Kewisch, J.)

Paper	Title	Page
TUPSM07	Parmela Simulation for BNL 704MHz SRF Gun in Low Emittance Operation	643
	E. Wang, I. Ben-Zvi, J. Kewisch 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 BNL 704MHz 0.5 cell SRF gun is designed for an ERL prototype with high bunch charge and high average current, and may ultimately be used to generate a high average current and high brightness electron beam for a high power far infrared free electron laser. In simulations with the space charge tracking code PARMELA we obtained a transverse normalized emittance beam of 0.28mm-mrad for a bunch charge of 300pC. The schematic layout of 704 MHz gun and its preliminary beam dynamics are presented in this paper. The emittance of electron beam was optimized for 300pC bunch charge,20ps bunch length and 20 MeV operations.

WEPBA05	Combining Multiple BPM Measurements for Precession AC Dipole Bump Closure	892
	P. Oddo, M. Bai, W.C. Dawson, J. Kewisch, Y. Makdisi, C. Pai, P.H. Pile, T. Roser 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 Energy and RIKEN, Japan. For the RHIC spin flipper to achieve a rotating field, it requires operating five AC dipoles as a pair of closed orbit bumps. One key requirement is to minimize the remnant AC dipole driven betatron oscillation outside of the spin flipper by 50dB. In the past, due to its inherent sensitivity, a single pickup with a direct-diode detector (3D) and dynamic signal analyzer (DSA) were used to measure bump closure by measuring the remnant oscillations. This however proved to be inadequate, as the betatron phase advance between the AC dipoles is non-zero. A method of combining multiple BPMs into a sensitive measure of bump closure has been developed and will be tested during RHIC polarized proton operation in 2013. This technique as well as the experimental results will be presented.

Paper

Title

Page

Parmela Simulation for BNL 704MHz SRF Gun in Low Emittance Operation

643

E. Wang, I. Ben-Zvi, J. Kewisch
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 BNL 704MHz 0.5 cell SRF gun is designed for an ERL prototype with high bunch charge and high average current, and may ultimately be used to generate a high average current and high brightness electron beam for a high power far infrared free electron laser. In simulations with the space charge tracking code PARMELA we obtained a transverse normalized emittance beam of 0.28mm-mrad for a bunch charge of 300pC. The schematic layout of 704 MHz gun and its preliminary beam dynamics are presented in this paper. The emittance of electron beam was optimized for 300pC bunch charge,20ps bunch length and 20 MeV operations.

WEPBA05

Combining Multiple BPM Measurements for Precession AC Dipole Bump Closure

892

P. Oddo, M. Bai, W.C. Dawson, J. Kewisch, Y. Makdisi, C. Pai, P.H. Pile, T. Roser
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 Energy and RIKEN, Japan.
For the RHIC spin flipper to achieve a rotating field, it requires operating five AC dipoles as a pair of closed orbit bumps. One key requirement is to minimize the remnant AC dipole driven betatron oscillation outside of the spin flipper by 50dB. In the past, due to its inherent sensitivity, a single pickup with a direct-diode detector (3D) and dynamic signal analyzer (DSA) were used to measure bump closure by measuring the remnant oscillations. This however proved to be inadequate, as the betatron phase advance between the AC dipoles is non-zero. A method of combining multiple BPMs into a sensitive measure of bump closure has been developed and will be tested during RHIC polarized proton operation in 2013. This technique as well as the experimental results will be presented.