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He, P.

Paper Title Page
MO6PFP044 Superconducting Magnets for a Final Focus Upgrade of ATF2 235
 
  • B. Parker, M. Anerella, J. Escallier, P. He, A.K. Jain, A. Marone
    BNL, Upton, Long Island, New York
  • B. Bolzon, A. Jeremie
    IN2P3-LAPP, Annecy-le-Vieux
  • P.A. Coe, D. Urner
    OXFORDphysics, Oxford, Oxon
  • C. Hauviller
    CERN, Geneva
  • A. Seryi
    SLAC, Menlo Park, California
  • T. Tauchi, K. Tsuchiya, J. Urakawa
    KEK, Ibaraki
  
 

Funding: Work supported by the U.S. Department of Energy under Contract No. DE-AC02-98CH10886.


The Accelerator Test Facility (ATF2) at KEK is a scaled down version of the final focus design proposed for the future linear colliders (LC) and aims to experimentally verify the final focus (FF) technology needed to obtain very small, stable beam spots at a LC interaction point. Initially the ATF2 FF is made using conventional (warm) quadrupole and sextupole magnets; however, we propose to upgrade the FF by replacing some of the conventional magnets with new superconducting magnets constructed with the same technology as those of the International Linear Collider baseline FF magnets*. With the superconducting magnet upgrade we can look to achieve smaller interaction point beta-functions and to study superconducting magnet vibration stability in an accelerator environment. Therefore for the ATF2 R&D magnet we endeavor to incorporate cryostat design features that facilitate monitoring of the cold mass movement via interferometric techniques. The design status of the ATF2 superconducting upgrade magnets is reported in this paper.


*International Linear Collider Reference Design Report, ILC-REPORT-2007-001, August 2007.

  
TH5PFP002 Simulation of Electron Cloud Density Distributions in RHIC Dipoles at Injection and Transition and Estimates for Scrubbing Times 3187
 
  • P. He, M. Blaskiewicz, W. Fischer
    BNL, Upton, Long Island, New York
  
 

In this report we summarize electron-cloud simulations for the RHIC dipole regions at injection and transition to estimate if scrubbing at injection would reduce the electron cloud density at transition. We simulate the horizontal electron cloud distribution in the RHIC dipoles for secondary electron yields (SEY) from 1.1 to 2.0 at injection (with a bunch intensity of 1.3x109) and at transition (with a bunch intensity of 1.2x109). Also, we unveil the sensitivity to rather small changes in bunch intensity from 1.0 x109 to 1.5x109 , when SEY keep at 1.4 and 1.5 both for injection and transition.