| Paper |
Title |
Page |
| MOPLT172 |
Quest for a New Working Point in RHIC
|
929 |
| |
- R. Tomas, M. Bai, W. Fischer, V. Ptitsyn, T. Roser, T. Satogata
BNL, Upton, Long Island, New York
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The beam-beam interaction is a limiting factor in RHIC's performance, particularly in proton operation. Changing the working point is a strategy to minimize the beam-beam effect and improve the performance of the machine. Experiments at injection energy and simulations have been performed for a set of working points in order to determine what are the best candidates.
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| WEPLT052 |
A Method to Measure the Skew Quadrupole Strengths in the SIS-18 using Two BPMs
|
1954 |
| |
- F. Franchi, T. Beier, M. Kirk, M. Moritz, G. Rumolo
GSI, Darmstadt
- R. Tomas
BNL, Upton, Long Island, New York
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In the SIS-18 of GSI a new set of skew quadrupoles has been installed to improve the multi-turn-injection. A new method based on the measurement of the resonance driving terms has been proposed to cross-check the nominal values and polarities of their gradients. Once a beam is transversely kicked, it experiences oscillations whose spectrum contains both the betatron tune line and secondary lines. The amplitude of each line is proportional to the strength of the multipoles, such as skew quadrupoles and sextupoles, present in the lattice. In this paper a recursive algorithm to derive the magnet strength from the spectral lines and the application of this method to the eight skew quadrupoles in the SIS-18 are presented.
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| WEPLT181 |
Measurement of Multipole Strengths from RHIC BPM Data
|
2239 |
| |
- R. Tomas, M. Bai, W. Fischer
BNL, Upton, Long Island, New York
- F. Franchi, G. Rumolo
GSI, Darmstadt
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Recently resonance driving terms were successfully measured in the CERN SPS and the BNL RHIC from the Fourier spectrum of BPM data. Based on these measurements a new analysis has been derived to extract multipole strengths.In this paper we present experimental measurements of sextupolar and skew quadrupolar strengths carried out at RHIC. Also discussed is the possibility of a non-destructive measurement using an AC dipole.
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| WEPLT182 |
Non-linear Modeling of the RHIC Interaction Regions
|
2242 |
| |
- R. Tomas, W. Fischer, A.K. Jain, Y. Luo, F.C. Pilat
BNL, Upton, Long Island, New York
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For RHIC's collision lattices the dominant sources of transverse non-linearities are located in the interaction regions. The field quality is available for most of the magnets in the interaction regions from the magnetic measurements, or from extrapolations of these measurements. We discuss the implementation of these measurements on the MADX models of the Blue and the Yellow rings and their impact on beam stability.
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| THPLT173 |
RHIC BPM Performance: Comparison of Run 2003 and 2004
|
2864 |
| |
- R. Calaga, R. Tomas
BNL, Upton, Long Island, New York
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Identification of malfunctioning BPMs plays an important role in any orbit or turn-by-turn analysis. Singular value decomposition (SVD)and Fourier transform methods were recently employed to identify malfunctioning BPMs at RHIC. A detailed statistical comparison between the two methods for Run 2003 was in good agreement and proved to be a robust method to identify faulty BPMs. We evaluate detailed BPM performance for different versions of BPM low-level software in 2003 and 2004.
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| MOPLT165 |
Luminosity Increases in Gold-gold Operation in RHIC
|
917 |
| |
- W. Fischer, L. Ahrens, J. Alessi, M. Bai, D. Barton, J. Beebe-Wang, M. Blaskiewicz, J.M. Brennan, D. Bruno, J. Butler, R. Calaga, P. Cameron, R. Connolly, T. D'Ottavio, J. DeLong, K.A. Drees, W. Fu, G. Ganetis, J. Glenn, T. Hayes, P. He, H.-C. Hseuh, H. Huang, P. Ingrassia, U. Iriso, R. Lee, Y. Luo, W.W. MacKay, G. Marr, A. Marusic, R. Michnoff, C. Montag, J. Morris, T. Nicoletti, B. Oerter, C. Pearson, S. Peggs, A. Pendzick, F.C. Pilat, V. Ptitsyn, T. Roser, J. Sandberg, T. Satogata, C. Schultheiss, A. Sidi-Yekhlef, L. Smart, S. Tepikian, R. Tomas, D. Trbojevic, N. Tsoupas, J. Tuozzolo, J. Van Zeijts, K. Vetter, K. Yip, A. Zaltsman, S.Y. Zhang, W. Zhang
BNL, Upton, Long Island, New York
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After an exploratory phase, during which a number of beam parameters were varied, the RHIC experiments now demand high luminosity to study heavy ion collisions in detail. Presently RHIC operates routinely above its design luminosity. In the first 4 weeks of its current operating period (Run-4) the machine has delivered more integrated luminosity that during the 14 weeks of the last gold-gold operating period (Run-2). We give an overview of the changes that increased the instantaneous luminosity and luminosity lifetime, raised the reliability, and improved the operational efficiency.
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