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Mernick, K.

Paper Title Page
MOPEC030 High Precision Tune and Coupling Feedback and Beam Transfer Function Measurements in RHIC 522
 
  • M.G. Minty, A.J. Curcio, W.C. Dawson, C. Degen, Y. Luo, G.J. Marr, B. Martin, A. Marusic, K. Mernick, P. Oddo, T. Russo, V. Schoefer, R. Schroeder, C. Schultheiss, M. Wilinski
    BNL, Upton, Long Island, New York
  
 

Pre­ci­sion mea­sure­ment and con­trol of the be­ta­tron tunes and be­ta­tron cou­pling in the Rel­a­tivis­tic Heavy Ion Col­lid­er (RHIC) are re­quired for es­tab­lish­ing and main­tain­ing both good op­er­at­ing con­di­tions and, par­tic­u­lar­ly dur­ing the ramp to high beam en­er­gies, high pro­ton beam po­lar­iza­tion. While the proof-of-prin­ci­ple for si­mul­ta­ne­ous tune and cou­pling feed­back was suc­cess­ful­ly demon­strat­ed ear­li­er, rou­tine ap­pli­ca­tion of these sys­tems has only be­come pos­si­ble re­cent­ly. Fol­low­ing nu­mer­ous mod­i­fi­ca­tions for im­proved mea­sure­ment res­o­lu­tion and feed­back con­trol, the time re­quired to es­tab­lish full-en­er­gy beams with the be­ta­tron tunes and cou­pling reg­u­lat­ed by feed­back was re­duced from sev­er­al weeks to a few hours. A sum­ma­ry of these im­prove­ments, se­lect mea­sure­ments ben­e­fit­ting from the im­proved res­o­lu­tion and a re­view of sys­tem per­for­mance are the sub­ject of this re­port.

  
MOPEC023 RHIC Performance for FY10 200 GeV Au+Au Heavy Ion Run 507
 
  • K.A. Brown, L. Ahrens, M. Bai, J. Beebe-Wang, M. Blaskiewicz, J.M. Brennan, D. Bruno, C. Carlson, R. Connolly, T. D'Ottavio, R. De Maria, K.A. Drees, W. Fischer, W. Fu, C.J. Gardner, D.M. Gassner, J.W. Glenn, Y. Hao, M. Harvey, T. Hayes, L.T. Hoff, H. Huang, J.S. Laster, R.C. Lee, V. Litvinenko, Y. Luo, W.W. MacKay, M. Mapes, G.J. Marr, A. Marusic, K. Mernick, R.J. Michnoff, M.G. Minty, C. Montag, J. Morris, S. Nemesure, B. Oerter, F.C. Pilat, V. Ptitsyn, G. Robert-Demolaize, T. Roser, T. Russo, P. Sampson, J. Sandberg, T. Satogata, V. Schoefer, C. Schultheiss, F. Severino, K. Smith, D. Steski, S. Tepikian, C. Theisen, P. Thieberger, D. Trbojevic, N. Tsoupas, J.E. Tuozzolo, G. Wang, M. Wilinski, A. Zaltsman, K. Zeno, S.Y. Zhang
    BNL, Upton, Long Island, New York
  
 

Since the last suc­cess­ful RHIC Au+Au run in 2007 (Run7), the RHIC ex­per­i­ments have made nu­mer­ous de­tec­tor im­prove­ments and up­grades. In order to ben­e­fit from the en­hanced de­tec­tor ca­pa­bil­i­ties and to in­crease the yield of rare events in the ac­quired heavy ion data a sig­nif­i­cant in­crease in lu­mi­nos­i­ty is es­sen­tial. In Run7 RHIC achieved an av­er­age store lu­mi­nos­i­ty of <L>=12x1026 cm-2 s-1 by op­er­at­ing with 103 bunch­es (out of 110 pos­si­ble), and by squeez­ing to β*=0.8 m. Our goal for this year's run, Run10, was to achieve an av­er­age of <L>=27x1026 cm-2 s-1. The mea­sures taken were de­creas­ing β* to 0.6 m, and re­duc­ing lon­gi­tu­di­nal and trans­verse emit­tances by means of bunched-beam stochas­tic cool­ing. In ad­di­tion we in­tro­duced a lat­tice to sup­press in­tra-beam scat­ter­ing (IBS) in both RHIC rings, up­grad­ed the RF sys­tem, and sep­a­rat­ed tran­si­tion cross­ings in both rings while ramp­ing. We pre­sent an overview of the changes and the re­sults in terms of Run10 in­creased in­stan­ta­neous lu­mi­nos­i­ty, lu­mi­nos­i­ty life­time, and in­te­grat­ed lu­mi­nos­i­ty.