PAC2013 - List of Authors (Cheng, W.X.)

Paper	Title	Page
MOPHO17	NSLS II Commissioning Tools	276
	G.M. Wang, B. Bacha, A. Blednykh, E.B. Blum, W.X. Cheng, J. Choi, L.R. Dalesio, M.A. Davidsaver, J.H. De Long, R.P. Fliller, G. George, W. Guo, K. Ha, H.-C. Hseuh, Y. Hu, W. Louie, M.A. Maggipinto, J. Mead, D. Padrazo, T.V. Shaftan, G. Shen, K. Shroff, O. Singh, Y. Tian, K. Vetter, F.J. Willeke, H. Xu, L. Yang, X. Yang BNL, Upton, Long Island, New York, USA P.B. Cheblakov, A.A. Derbenev, A.I. Erokhin, S.M. Gurov, R.A. Kadyrov, S.E. Karnaev, E.A. Simonov, S.V. Sinyatkin, V.V. Smaluk BINP SB RAS, Novosibirsk, Russia
	NSLS-II is a state-of-the-art third-generation light source under construction at BNL. As many facilities worldwide, NSLS II uses the EPICS control system to monitor and control all accelerator hardware. CSS is used for simple tasks such as monitoring, display, setting of PVs and browsing the historical data. For more complex accelerator physics applications, a collection of scripts are mainly written in Python. The controls group developed the services, such as channel finder, machine snapshot, data archiving, twiss server, unit conversion etc. This paper will present the tools that we have been using for commissioning.

WEPBA06	Stripline Beam Impedance	895
	A. Blednykh, W.X. Cheng, S. Krinsky BNL, Upton, Long Island, New York, USA
	We discuss Lambertson and Shafer formalisms for the longitudinal and transverse beam impedances of a stripline. The required characteristic impedances and the geometric factors are determined by the solution of Laplace’s equation in 2-dimensions, which we find using the 2-D POISSON code. Lambertson’s equations are compared with numerical results obtained using the 3-D electromagnetic simulation code GdfidL. Good agreement is found at low frequencies. The results differ at high frequencies, since the analytic results do not take into account the existence of higher-order modes (HOM’s) in structures with and without smooth transitions. We then present a discussion of the stripline kicker being built for the bunch-by-bunch transverse feedback system for the NSLS-II storage ring.

THPAC10	Design and Testing of Faraday's Cup for NSLS-II Linac and Booster	1160
	H.C. Fernandes, B. Belkacem, W.X. Cheng, W. Guo, B.N. Kosciuk, J. Rank, S.K. Sharma, O. Singh, T. Tanabe, G.M. Wang BNL, Upton, Long Island, New York, USA
	Funding: DOE The NSLS-II project includes a 3GeV beam that would have to be maintained and supplied through the injection system which would operate in top-off mode with minimum disturbance to the storage ring. The Diagnostic group at NSLS-II designed, prototyped and tested the Faraday’s cup and dump that would be used at three locations in the Linac and booster area. Power density calculations and FEA simulations were carried out on the dump for the 200 MeV maximum power dumped. The Faraday’s cup was also tested to characterize its operation for the 200 MeV Linac.

Paper

Title

Page

NSLS II Commissioning Tools

276

G.M. Wang, B. Bacha, A. Blednykh, E.B. Blum, W.X. Cheng, J. Choi, L.R. Dalesio, M.A. Davidsaver, J.H. De Long, R.P. Fliller, G. George, W. Guo, K. Ha, H.-C. Hseuh, Y. Hu, W. Louie, M.A. Maggipinto, J. Mead, D. Padrazo, T.V. Shaftan, G. Shen, K. Shroff, O. Singh, Y. Tian, K. Vetter, F.J. Willeke, H. Xu, L. Yang, X. Yang
BNL, Upton, Long Island, New York, USA
P.B. Cheblakov, A.A. Derbenev, A.I. Erokhin, S.M. Gurov, R.A. Kadyrov, S.E. Karnaev, E.A. Simonov, S.V. Sinyatkin, V.V. Smaluk
BINP SB RAS, Novosibirsk, Russia

NSLS-II is a state-of-the-art third-generation light source under construction at BNL. As many facilities worldwide, NSLS II uses the EPICS control system to monitor and control all accelerator hardware. CSS is used for simple tasks such as monitoring, display, setting of PVs and browsing the historical data. For more complex accelerator physics applications, a collection of scripts are mainly written in Python. The controls group developed the services, such as channel finder, machine snapshot, data archiving, twiss server, unit conversion etc. This paper will present the tools that we have been using for commissioning.

WEPBA06

Stripline Beam Impedance

895

A. Blednykh, W.X. Cheng, S. Krinsky
BNL, Upton, Long Island, New York, USA

We discuss Lambertson and Shafer formalisms for the longitudinal and transverse beam impedances of a stripline. The required characteristic impedances and the geometric factors are determined by the solution of Laplace’s equation in 2-dimensions, which we find using the 2-D POISSON code. Lambertson’s equations are compared with numerical results obtained using the 3-D electromagnetic simulation code GdfidL. Good agreement is found at low frequencies. The results differ at high frequencies, since the analytic results do not take into account the existence of higher-order modes (HOM’s) in structures with and without smooth transitions. We then present a discussion of the stripline kicker being built for the bunch-by-bunch transverse feedback system for the NSLS-II storage ring.

THPAC10

Design and Testing of Faraday's Cup for NSLS-II Linac and Booster

1160

H.C. Fernandes, B. Belkacem, W.X. Cheng, W. Guo, B.N. Kosciuk, J. Rank, S.K. Sharma, O. Singh, T. Tanabe, G.M. Wang
BNL, Upton, Long Island, New York, USA

Funding: DOE
The NSLS-II project includes a 3GeV beam that would have to be maintained and supplied through the injection system which would operate in top-off mode with minimum disturbance to the storage ring. The Diagnostic group at NSLS-II designed, prototyped and tested the Faraday’s cup and dump that would be used at three locations in the Linac and booster area. Power density calculations and FEA simulations were carried out on the dump for the 200 MeV maximum power dumped. The Faraday’s cup was also tested to characterize its operation for the 200 MeV Linac.