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Thieberger, P.

Paper Title Page
TH5RFP019 Optical Beam Profile Monitor at the RHIC Polarized Hydrogen Jet 3485
 
  • T. Tsang, S. Bellavia, R. Connolly, D.M. Gassner, Y. Makdisi, M.G. Minty, T. Russo, P. Thieberger, D. Trbojevic, A. Zelenski
    BNL, Upton, Long Island, New York
  
 

A gas fluorescence beam profile monitor has been realized at the relativistic heavy ion collider (RHIC) using the polarized atomic hydrogen gas jet. RHIC proton beam profiles in the vertical plane are obtained as well as measurements of the width of the gas jet in the beam direction. For gold ion beams, the fluorescence cross section is sufficiently large so that profiles can be obtained from the residual gas alone, albeit with long light integration times and lower number of Au ions than protons. We estimate the fluorescence cross-section of 100 GeV protons and Au ions on hydrogen gas to be 6.6x10-21 cm2 ~1.7x10-16 cm2, respectively*. We calculate the beam emittance to provide an independent measurement of the RHIC beam. This optical beam diagnostic technique, utilizing the beam induced fluorescence from injected or residual gas, represents a step towards the realization of a simple and truly noninvasive beam monitor for high-energy particle beams together with a wall-current-monitor system and/or a low light level optical temporal measurement system, a 3-dimensional particle beam profile system can be envisioned providing routine diagnosis of high-energy particle beams.


*T. Tsang, et. al., Rev. Sci. Instrum. 79, 105103 (2008).

  
TH6PFP015 Minimizing Emittance Growth during H- Injection in the AGS Booster 3729
 
  • K.A. Brown, L. A. Ahrens, C.J. Gardner, D.M. Gassner, D. Raparia, D. Steski, P. Thieberger, K. Zeno
    BNL, Upton, Long Island, New York
  
 

Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.


As part of the efforts to increase polarization and luminosity in RHIC during polarized proton operations we have modified the injection optics and stripping foil geometry in the AGS Booster in order to reduce the emittance growth during H- injection. In this paper we describe the modifications, the injection process, and present results from beam experiments.