Abstracts Brochure - CERN

MOPLS — Poster Session 26-Jun-06 16:00 - 18:00
On the Feasibility of Polarized Heavy Ions in RHIC
Heavy nonspherical ions such as uranium
have been proposed for collisions in RHIC. W.W. MacKay (BNL)
When two such ions collide with their long
axes aligned, then the plasma density might be as much as 60% higher. Since the collisions might have any orientation
of the two nuclei, the alignment of the nuclei must be inferred from a complicated unfolding of multiplicity
distributions. Instead, if it is possible to polarize the ions and control the orientation in RHIC, then a much better
sensitivity could be obtained. This paper investigates the manipulation of such polarized ions with highly distorted
shapes in RHIC. Several ion species are considered as possibilities with either full or partial Siberian snakes in RHIC.
Status of Fast IR Orbit Feedback at RHIC
To compensate modulated beam-beam offsets
caused by mechanical vibrations of IR C. Montag, J. Cupolo, J. Glenn, V. Litvinenko, W. Meng, R.J. Mich-
triplet quadrupoles at frequencies around 10 noff, T. Roser, C. Schultheiss, J.E. Tuozzolo (BNL)
Hz, a fast IR orbit feedback system has been
developed. We report design considerations and recent status of the system.
RHIC Performance as Polarized Proton Collider in Run-6
The Relativistic Heavy Ion Collider in Run-
6 was operating in polarized proton mode. V. Ptitsyn, M. Bai, D.S. Barton, J. Beebe-Wang, M. Blaskiewicz, A.
With two Siberian Snakes per ring, the po- Bravar, J.M. Brennan, K.A. Brown, D. Bruno, G. Bunce, P. Cameron,
larized protons were brought into collisions R. Connolly, T. D’Ottavio, J. DeLong, K.A. Drees, A.V. Fedotov, W.
at 100 Gev and 31.2 Gev energies. The con- Fischer, G. Ganetis, T. Hayes, H.-C. Hseuh, H. Huang, P. Ingrastrol
of polarization orientation at STAR and sia, D. Kayran, J. Kewisch, R.C. Lee, V. Litvinenko, Y. Luo, W.W.
PHENIX experiments was done using heli- MacKay, Y. Makdisi, G.J. Marr, A. Marusic, R.J. Michnoff, C. Moncal
spin rotators. Physics studies were contag, J. Morris, T. Nicoletti, B. Oerter, F.C. Pilat, T. Roser, T. Russo,
ducted with longitudinal, vertical and radial J. Sandberg, T. Satogata, C. Schultheiss, S. Tepikian, D. Trbojevic,
beam polarization at collision points. This N. Tsoupas, J.E. Tuozzolo, A. Zaltsman, A. Zelenski, K. Zeno, S.Y.
paper presents the performance of RHIC as
a polarized proton collider in the Run-6 with
Zhang (BNL)
emphasis on beam polarization and luminosity issues.
113
MOPLS022
MOPLS023
MOPLS024