PAC07 - List of Authors (Yang, X.)

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Yang, X.

Paper	Title	Page
TUPAS040	Momentum Spread Reduction at Beam Extraction from the Fermilab Booster at Slipstacking Injection to the Main Injector	1733
	A. I. Drozhdin W. Pellico, X. Yang Fermilab, Batavia, Illinois
	In order to reduce the momentum spread of the beam at extraction from the Booster to the Main Injector with slip stacking injection, the bunch rotation at the end of the cycle is applied. However, the fast RF voltage reduction often causes beam loading issues to Booster RF cavities, and the reliability of extracted beam becomes a problem. An alternative solution is investigated - modulating the RF voltage with twice of the synchrotron frequency introduces bunch length oscillation, and the beam is extracted at the time when the bunch length reaches maximum and the momentum spread becomes minimal.
TUPAS041	Injection Parameters Optimization for the Fermilab Booster	1736
	A. I. Drozhdin W. Pellico, X. Yang Fermilab, Batavia, Illinois
	The maximal capacitance for the Booster to deliver the 8-GeV beam to downstream accelerators is limited by the beam loss. Most of losses happen at injection due to space charge effect being the strongest at the injection energy. Optimizing the RF voltage ramp in the presence of the space charge effect to capture more beam and simultaneously keep small beam emittance has been numerically investigated using 3-D STRUCT code. The results of simulations agree well with the measurements in the machine. Possibilities, such as beam painting and using the second rf harmonic at injection, for further reductions of beam loss in order to reach the maximum beam intensity delivered from the Booster have been investigated.
TUPAS042	Transition Crossing Simulation at the Fermilab Booster	1739
	A. I. Drozhdin W. Pellico, X. Yang Fermilab, Batavia, Illinois
	The demand in high intensity and low emittance of the beam extracted from the Booster requires a better control over the momentum spread growth and bunch length shortening at transition, in order to prevent beam loss and coupled bunch instability. Since the transition crossing involves both longitudinal and transverse dynamics, the recently modified 3-D STRUCT code provides an opportunity to numerically investigate different transition schemes in the machine environment, and apply the results of simulation to minimize the beam loss and emittance growth operationally.
WEOCAB01	Design of the Beam Delivery System for the International Linear Collider	1985
	A. Seryi I. V. Agapov, G. A. Blair, S. T. Boogert, J. Carter Royal Holloway, University of London, Surrey M. Alabau, P. Bambade, J. Brossard, O. Dadoun LAL, Orsay J. A. Amann, R. Arnold, F. Asiri, K. L.F. Bane, P. Bellomo, E. Doyle, A. F. Fasso, L. Keller, J. Kim, K. Ko, Z. Li, T. W. Markiewicz, T. V.M. Maruyama, K. C. Moffeit, S. Molloy, Y. Nosochkov, N. Phinney, T. O. Raubenheimer, S. Seletskiy, S. Smith, C. M. Spencer, P. Tenenbaum, D. R. Walz, G. R. White, M. Woodley, M. Woods, L. Xiao SLAC, Menlo Park, California M. Anerella, A. K. Jain, A. Marone, B. Parker BNL, Upton, Long Island, New York D. A.-K. Angal-Kalinin, C. D. Beard, J.-L. Fernandez-Hernando, P. Goudket, F. Jackson, J. K. Jones, A. Kalinin, P. A. McIntosh STFC/DL/ASTeC, Daresbury, Warrington, Cheshire R. Appleby UMAN, Manchester J. L. Baldy, D. Schulte CERN, Geneva L. Bellantoni, A. I. Drozhdin, V. S. Kashikhin, V. Kuchler, T. Lackowski, N. V. Mokhov, N. Nakao, T. Peterson, M. C. Ross, S. I. Striganov, J. C. Tompkins, M. Wendt, X. Yang Fermilab, Batavia, Illinois K. Buesser DESY, Hamburg P. Burrows, G. B. Christian, C. I. Clarke, A. F. Hartin OXFORDphysics, Oxford, Oxon G. Burt, A. C. Dexter Cockcroft Institute, Warrington, Cheshire J. Carwardine, C. W. Saunders ANL, Argonne, Illinois B. Constance, H. Dabiri Khah, C. Perry, C. Swinson JAI, Oxford O. Delferriere, O. Napoly, J. Payet, D. Uriot CEA, Gif-sur-Yvette C. J. Densham, R. J.S. Greenhalgh STFC/RAL, Chilton, Didcot, Oxon A. Enomoto, S. Kuroda, T. Okugi, T. Sanami, Y. Suetsugu, T. Tauchi KEK, Ibaraki A. Ferrari UU/ISV, Uppsala J. Gronberg LLNL, Livermore, California Y. Iwashita Kyoto ICR, Uji, Kyoto W. Lohmann DESY Zeuthen, Zeuthen L. Ma STFC/DL, Daresbury, Warrington, Cheshire T. M. Mattison UBC, Vancouver, B. C. T. S. Sanuki University of Tokyo, Tokyo V. I. Telnov BINP SB RAS, Novosibirsk E. T. Torrence University of Oregon, Eugene, Oregon D. Warner Colorado University at Boulder, Boulder, Colorado N. K. Watson Birmingham University, Birmingham H. Y. Yamamoto Tohoku University, Sendai
	The beam delivery system for the linear collider focuses beams to nanometer sizes at the interaction point, collimates the beam halo to provide acceptable background in the detector and has a provision for state-of-the art beam instrumentation in order to reach the physics goals. The beam delivery system of the International Linear Collider has undergone several configuration changes recently. This paper describes the design details and status of the baseline configuration considered for the reference design.
	Slides
THPAN105	Effects of Space Charge and Magnet Nonlinearities on Beam Dynamics in the Fermilab Booster	3474
	Y. Alexahin A. I. Drozhdin, X. Yang Fermilab, Batavia, Illinois N. Yu. Kazarinov JINR, Dubna, Moscow Region
	Funding: Work supported by the Universities Research Assoc., Inc., under contract DE-AC02-76CH03000 with the U. S. Dept. of Energy Presently the Fermilab Booster can accomodate about half the maximum proton beam intensity which the Linac can deliver. One of the limitations is related to large vertical tuneshift produced by space-charge forces at injection energy. In the present report we study the nonlinear beam dynamics in the presence of space charge and magnet imperfections and analyze the possibility of space charge compensation with electron lenses.