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Title: RHIC PERFORMANCE DURING THE FY10 200 GeV Au+Au HEAVY ION RUN

Abstract

Since the last successful RHIC Au+Au run in 2007 (Run-7), 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 Run-7 RHIC achieved an average store luminosity of <L> = 12 x 10{sup 26} cm{sup -2} s{sup -1} by operating with 103 bunches (out of 111 possible), and by squeezing to {beta}* = 0.85 m. This year, Run-10, we achieved <L> = 20 x 10{sup 26} cm{sup -2} s{sup -1}, which put us an order of magnitude above the RHIC design luminosity. To reach these luminosity levels we decreased {beta}* to 0.75 m, operated with 111 bunches per ring, and reduced 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 control system, and separated transition crossing times in the two rings. We present an overview of the changes and the results of Run-10 performance.

Authors:
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Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL) Relativistic Heavy Ion Collider
Sponsoring Org.:
Doe - Office Of Science
OSTI Identifier:
984410
Report Number(s):
BNL-90754-2010-CP
R&D Project: KBCH139; KB0202011; TRN: US1005299
DOE Contract Number:
DE-AC02-98CH10886
Resource Type:
Conference
Resource Relation:
Conference: First International Particle Accelerator Conference (IPAC) 2010; Kyoto, Japan; 20100523 through 20100528
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ACCELERATORS; CONTROL SYSTEMS; DESIGN; HEAVY IONS; LUMINOSITY; PERFORMANCE; SCATTERING; STOCHASTIC COOLING; BROOKHAVEN RHIC; relativistic heavy ion collider

Citation Formats

Brown, K.A., Ahrens, L., Bai, M., Beebe-Wang, J., Blaskiewicz, M., Brennan, J., Bruno, D., Carlson, C., Connolly, R., de Maria, R., D’Ottavio, T., Drees, A., Fischer, W., Fu, W., Gardner, C., Gassner, D., Glenn, J.W., Hao, Y., Harvey, M., Hayes, T., Hoff, L., Huang, H., Laster, J., Lee, R., Litvinenko, V., Luo, Y., MacKay, W., Marr, G., Marusic, A., Mernick, K., Michnoff, R., Minty, M., Montag, C., Morris, J., Nemesure, S., Oerter, B., Pilat, F., Ptitsyn, V., Robert-Demolaize, G., Roser, T., Russo, T., Sampson, P., Sandberg, J., Satogata, T., Severino, F., Schoefer, V., Schultheiss, C., Smith, K., Steski, D., Tepikian, S., Theisen, C., Thieberger, P., Trbojevic, D., Tsoupas, N., Tuozzolo, J., Wang, G., Wilinski, M., Zaltsman, A., Zeno, K., and Zhang, S.Y.. RHIC PERFORMANCE DURING THE FY10 200 GeV Au+Au HEAVY ION RUN. United States: N. p., 2010. Web.
Brown, K.A., Ahrens, L., Bai, M., Beebe-Wang, J., Blaskiewicz, M., Brennan, J., Bruno, D., Carlson, C., Connolly, R., de Maria, R., D’Ottavio, T., Drees, A., Fischer, W., Fu, W., Gardner, C., Gassner, D., Glenn, J.W., Hao, Y., Harvey, M., Hayes, T., Hoff, L., Huang, H., Laster, J., Lee, R., Litvinenko, V., Luo, Y., MacKay, W., Marr, G., Marusic, A., Mernick, K., Michnoff, R., Minty, M., Montag, C., Morris, J., Nemesure, S., Oerter, B., Pilat, F., Ptitsyn, V., Robert-Demolaize, G., Roser, T., Russo, T., Sampson, P., Sandberg, J., Satogata, T., Severino, F., Schoefer, V., Schultheiss, C., Smith, K., Steski, D., Tepikian, S., Theisen, C., Thieberger, P., Trbojevic, D., Tsoupas, N., Tuozzolo, J., Wang, G., Wilinski, M., Zaltsman, A., Zeno, K., & Zhang, S.Y.. RHIC PERFORMANCE DURING THE FY10 200 GeV Au+Au HEAVY ION RUN. United States.
Brown, K.A., Ahrens, L., Bai, M., Beebe-Wang, J., Blaskiewicz, M., Brennan, J., Bruno, D., Carlson, C., Connolly, R., de Maria, R., D’Ottavio, T., Drees, A., Fischer, W., Fu, W., Gardner, C., Gassner, D., Glenn, J.W., Hao, Y., Harvey, M., Hayes, T., Hoff, L., Huang, H., Laster, J., Lee, R., Litvinenko, V., Luo, Y., MacKay, W., Marr, G., Marusic, A., Mernick, K., Michnoff, R., Minty, M., Montag, C., Morris, J., Nemesure, S., Oerter, B., Pilat, F., Ptitsyn, V., Robert-Demolaize, G., Roser, T., Russo, T., Sampson, P., Sandberg, J., Satogata, T., Severino, F., Schoefer, V., Schultheiss, C., Smith, K., Steski, D., Tepikian, S., Theisen, C., Thieberger, P., Trbojevic, D., Tsoupas, N., Tuozzolo, J., Wang, G., Wilinski, M., Zaltsman, A., Zeno, K., and Zhang, S.Y.. Sun . "RHIC PERFORMANCE DURING THE FY10 200 GeV Au+Au HEAVY ION RUN". United States. doi:. https://www.osti.gov/servlets/purl/984410.
@article{osti_984410,
title = {RHIC PERFORMANCE DURING THE FY10 200 GeV Au+Au HEAVY ION RUN},
author = {Brown, K.A. and Ahrens, L. and Bai, M. and Beebe-Wang, J. and Blaskiewicz, M. and Brennan, J. and Bruno, D. and Carlson, C. and Connolly, R. and de Maria, R. and D’Ottavio, T. and Drees, A. and Fischer, W. and Fu, W. and Gardner, C. and Gassner, D. and Glenn, J.W. and Hao, Y. and Harvey, M. and Hayes, T. and Hoff, L. and Huang, H. and Laster, J. and Lee, R. and Litvinenko, V. and Luo, Y. and MacKay, W. and Marr, G. and Marusic, A. and Mernick, K. and Michnoff, R. and Minty, M. and Montag, C. and Morris, J. and Nemesure, S. and Oerter, B. and Pilat, F. and Ptitsyn, V. and Robert-Demolaize, G. and Roser, T. and Russo, T. and Sampson, P. and Sandberg, J. and Satogata, T. and Severino, F. and Schoefer, V. and Schultheiss, C. and Smith, K. and Steski, D. and Tepikian, S. and Theisen, C. and Thieberger, P. and Trbojevic, D. and Tsoupas, N. and Tuozzolo, J. and Wang, G. and Wilinski, M. and Zaltsman, A. and Zeno, K. and Zhang, S.Y.},
abstractNote = {Since the last successful RHIC Au+Au run in 2007 (Run-7), 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 Run-7 RHIC achieved an average store luminosity of <L> = 12 x 10{sup 26} cm{sup -2} s{sup -1} by operating with 103 bunches (out of 111 possible), and by squeezing to {beta}* = 0.85 m. This year, Run-10, we achieved <L> = 20 x 10{sup 26} cm{sup -2} s{sup -1}, which put us an order of magnitude above the RHIC design luminosity. To reach these luminosity levels we decreased {beta}* to 0.75 m, operated with 111 bunches per ring, and reduced 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 control system, and separated transition crossing times in the two rings. We present an overview of the changes and the results of Run-10 performance.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun May 23 00:00:00 EDT 2010},
month = {Sun May 23 00:00:00 EDT 2010}
}

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  • Following the Fiscal Year (FY) 2010 (Run-10) Relativistic Heavy Ion Collider (RHIC) Au+Au run, RHIC experiment upgrades sought to improve detector capabilities. In turn, accelerator improvements were made to improve the luminosity available to the experiments for this run (Run-11). These improvements included: a redesign of the stochastic cooling systems for improved reliability; a relocation of 'common' RF cavities to alleviate intensity limits due to beam loading; and an improved usage of feedback systems to control orbit, tune and coupling during energy ramps as well as while colliding at top energy. We present an overview of changes to the Collidermore » and review the performance of the collider with respect to instantaneous and integrated luminosity goals. At the conclusion of the FY 2011 polarized proton run, preparations for heavy ion run proceeded on April 18, with Au+Au collisions continuing through June 28. Our standard operations at 100 GeV/nucleon beam energy was bracketed by two shorter periods of collisions at lower energies (9.8 and 13.5 GeV/nucleon), continuing a previously established program of low and medium energy runs. Table 1 summarizes our history of heavy ion operations at RHIC.« less
  • After the last successful RHIC Au-Au run in 2004 (Run-4), RHIC experiments now require significantly enhanced luminosity to study very rare events in heavy ion collisions. RHIC has demonstrated its capability to operate routinely above its design average luminosity per store of 2x10{sup 25}cm{sup -2}s{sup -1}. In Run-4 we already achieved 2.5 times the design luminosity in RHIC. This luminosity was achieved with only 40% of the total possible number of bunches filled, and with $'* = 1 m. However, the goal is to reach 4 times the design luminosity, an average of 8x 1 by reducing the P* valuemore » and increasing the number of bunches to the accelerator maximum of Figure 1 : Integrated delivered luminosity for the four IRs with 11 1. In addition, the average time at store was expected to the minimum and maximum predictions up to June 18,2007. be increased by a factor of 1.1 to about 60% of calendar time. We present an overview of the changes that increased the instantaneous luminosity, luminosity lifetime and integrated luminosity of RHIC Au-Au operations during Run-7 even though the goal of 60% time at store could not be reached.« less
  • We calculate the centrality dependence of transverse momentum (p{sub t}) spectra for direct photons in Au+Au collisions at the BNL Relativistic Heavy Ion Collider (RHIC) energy {radical}(s{sub NN})=200 GeV, based on a realistic data-constrained (3+1)-dimensional hydrodynamic description of the expanding hot and dense matter, a reasonable treatment of the propagation of partons and their energy loss in the fluid, and a systematic study of the main sources of direct photons. The resultant p{sub t} spectra agree with recent PHENIX data in a broad p{sub t} range. The competition among the different direct photon sources is investigated at various centralities. Partonmore » energy loss in the plasma is considered for photons from fragmentation and jet-photon conversion, which causes about 40% decrease in the total contribution. In the high p{sub t} region, the observed R{sub AA} of photons is centrality independent at the accuracy of 5% based on a realistic treatment of energy loss. We also link the different behavior of R{sub AA} for central and peripheral collisions, in the low p{sub t} region, to the fact that the plasma in central collisions is hotter than that in peripheral ones.« less