PAC07 - List of Authors (Wang, G.)

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Wang, G.

Paper	Title	Page
THPAS104	Simulations of RHIC Coherent Stabilities Due To Wakefield and Electron Cooling	3726
	G. Wang M. Blaskiewicz BNL, Upton, Long Island, New York
	A circulating ion beam in the presence of electron cooling can experience varies instabilities if the electron beam intensity is above a certain threshold. Firstly the electric field generated by the electron beam can introduce two stream instabilities of varies modes; this has already been observed in the Fermilab Recycler ring. Secondly, longitudinal cooling of the momentum spread will reduce the Landau damping efficiency and thus may make the overcooled ion beam unstable. The thresholds and growth rates of varies two stream instability modes are discussed for the existing RHIC electron cooler design. Both simulation and theoretical results are shown for the thresholds of the instabilities caused by overcooling.
TUPMS076	Status of R&D Energy Recovery Linac at Brookhaven National Laboratory	1347
	V. Litvinenko J. Alduino, D. Beavis, I. Ben-Zvi, M. Blaskiewicz, J. M. Brennan, A. Burrill, R. Calaga, P. Cameron, X. Chang, K. A. Drees, G. Ganetis, D. M. Gassner, J. G. Grimes, H. Hahn, L. R. Hammons, A. Hershcovitch, H.-C. Hseuh, A. K. Jain, D. Kayran, J. Kewisch, R. F. Lambiase, D. L. Lederle, C. Longo, G. J. Mahler, G. T. McIntyre, W. Meng, T. C. Nehring, B. Oerter, C. Pai, D. Pate, D. Phillips, E. Pozdeyev, T. Rao, J. Reich, T. Roser, T. Russo, Z. Segalov, J. Smedley, K. Smith, J. E. Tuozzolo, G. Wang, D. Weiss, N. Williams, Q. Wu, K. Yip, A. Zaltsman BNL, Upton, Long Island, New York H. Bluem, M. D. Cole, A. J. Favale, D. Holmes, J. Rathke, T. Schultheiss, A. M.M. Todd AES, Princeton, New Jersey B. W. Buckley CLASSE, Ithaca G. Citver Stony Brook University, StonyBrook J. R. Delayen, L. W. Funk, H. L. Phillips, J. P. Preble Jefferson Lab, Newport News, Virginia
	Funding: Work performed under the auspices of the U. S. Department of Energy and partially funded by the US Department of Defence. In this paper we present status and plans for the 20-MeV R&D energy recovery linac, which is under construction at Collider Accelerator Department at BNL. The facility is based on high current (up to 0.5 A of average current) super-conducting 2.5 MeV RF gun, single-mode super-conducting 5-cell RF linac and about 20-m long return loop with very flexible lattice. The R&D ERL, which is planned for commissioning in 2008, aims to address many outstanding questions relevant for high current, high brightness energy-recovery linacs.
WEOCKI03	Status of the R&D Towards Electron Cooling of RHIC	1938
	I. Ben-Zvi D. T. Abell, G. I. Bell, D. L. Bruhwiler, R. Busby, J. R. Cary, D. A. Dimitrov, P. Messmer, V. H. Ranjbar, D. S. Smithe, A. V. Sobol, P. Stoltz Tech-X, Boulder, Colorado J. Alduino, D. S. Barton, D. Beavis, M. Blaskiewicz, J. M. Brennan, A. Burrill, R. Calaga, P. Cameron, X. Chang, K. A. Drees, A. V. Fedotov, W. Fischer, G. Ganetis, D. M. Gassner, J. G. Grimes, H. Hahn, L. R. Hammons, A. Hershcovitch, H.-C. Hseuh, D. Kayran, J. Kewisch, R. F. Lambiase, D. L. Lederle, V. Litvinenko, C. Longo, W. W. MacKay, G. J. Mahler, G. T. McIntyre, W. Meng, B. Oerter, C. Pai, G. Parzen, D. Pate, D. Phillips, S. R. Plate, E. Pozdeyev, T. Rao, J. Reich, T. Roser, A. G. Ruggiero, T. Russo, C. Schultheiss, Z. Segalov, J. Smedley, K. Smith, T. Tallerico, S. Tepikian, R. Than, R. J. Todd, D. Trbojevic, J. E. Tuozzolo, P. Wanderer, G. Wang, D. Weiss, Q. Wu, K. Yip, A. Zaltsman BNL, Upton, Long Island, New York A. V. Aleksandrov, D. L. Douglas, Y. W. Kang ORNL, Oak Ridge, Tennessee H. Bluem, M. D. Cole, A. J. Favale, D. Holmes, J. Rathke, T. Schultheiss, J. J. Sredniawski, A. M.M. Todd AES, Princeton, New Jersey A. V. Burov, S. Nagaitsev, L. R. Prost Fermilab, Batavia, Illinois Y. S. Derbenev, P. Kneisel, J. Mammosser, H. L. Phillips, J. P. Preble, C. E. Reece, R. A. Rimmer, J. Saunders, M. Stirbet, H. Wang Jefferson Lab, Newport News, Virginia V. V. Parkhomchuk, V. B. Reva BINP SB RAS, Novosibirsk A. O. Sidorin, A. V. Smirnov JINR, Dubna, Moscow Region
	Funding: Work done under the auspices of the US DOE with support from the US DOD. The physics interest in a luminosity upgrade of RHIC requires the development of a cooling-frontier facility. Detailed cooling calculations have been made to determine the efficacy of electron cooling of the stored RHIC beams. This has been followed by beam dynamics simulations to establish the feasibility of creating the necessary electron beam. Electron cooling of RHIC at collisions requires electron beam energy up to about 54 MeV at an average current of between 50 to 100 mA and a particularly bright electron beam. The accelerator chosen to generate this electron beam is a superconducting Energy Recovery Linac (ERL) with a superconducting RF gun with a laser-photocathode. An intensive experimental R&D program engages the various elements of the accelerator: Photocathodes of novel design, superconducting RF electron gun of a particularly high current and low emittance, a very high-current ERL cavity and a demonstration ERL using these components.
	Slides
THPAS100	Collective Effects in the RHIC-II Electron Cooler	3717
	E. Pozdeyev I. Ben-Zvi, A. V. Fedotov, D. Kayran, V. Litvinenko, G. Wang BNL, Upton, Long Island, New York
	Funding: Work supported by U. S. DOE under contract No DE-AC02-98CH1-886 Electron cooling at RHIC-II upgrade imposes strict requirements on the quality of the electron beam at the cooling section. Beam current dependent effects such as the space charge, wake fields, CSR in bending magnets, trapped ions, etc., will tend to spoil the beam quality and decrease the cooling efficiency. In this paper, we estimate the defocusing effect of the space charge at the cooling section and describe our plan to compensate the defocusing space charge force by focusing solenoids. We also estimate the energy spread and emittance growth cased by wake fields. Finally, we discuss ion trapping in the electron cooler and consider different techniques to minimize the effect of ion trapping.