MOOCN —  Colliders I   (28-Mar-11   13:30—15:30)
Chair: V.A. Lebedev, Fermilab, Batavia, USA
Paper Title Page
MOOCN1 Status of the LHC Operations and Physics Program 32
 
  • S. Redaelli
    CERN, Geneva, Switzerland
  
  The Large Hadron Collider (LHC) at the European Organization for Nuclear Research (CERN) has just completed a successful first year of operation. In 2010, the primary goal to achieved a peak luminosity of 1032cm−2s−1 at a 7 TeV centre-of-mass energy was achieved and the machine achieved safely and reliably routine operation in the multi-MJ regime. The good results of 2010 have laid a solid foundation towards the achievement of the primary physics goal to deliver an integrated luminosity of 1 fb−1 in 2011. A fast and efficient LHC re-commissioning in 2011 lead already to a peak luminosity of 2.5×1032cm−2s−1 achieved in the fourth commissioning week. In this paper, the 2010 commissioning experience is reviewed and the present status and perspective are presented.  
slides icon Slides MOOCN1 [15.792 MB]  
 
MOOCN2 Tevatron Accelerator Physics and Operation Highlights 37
 
  • A. Valishev
    Fermilab, Batavia, USA
  
  Funding: Fermilab is operated by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the United States Department of Energy.
The performance of the Tevatron collider demonstrated continuous growth over the course of Run II, with the peak luminosity reaching 4·1032 cm-2 s-1 and the weekly integration rate exceeding 70 pb-1. This report presents a review of the most important advances that contributed to this performance improvement, including beam dynamics modeling, precision optics measurements and stability control, implementation of collimation during low-beta squeeze. Algorithms employed for optimization of the luminosity integration are presented and the lessons learned from high-luminosity operation are discussed. Studies of novel accelerator physics concepts at the Tevatron are described, such as the collimation techniques using crystal collimator and hollow electron beam, and compensation of beam-beam effects. 		 
slides icon Slides MOOCN2 [5.422 MB]  
 
MOOCN3 RHIC Polarized Proton Operation 41
 
  • H. Huang, L. A. Ahrens, I.G. Alekseev, E.C. Aschenauer, G. Atoian, M. Bai, A. Bazilevsky, J. Beebe-Wang, M. Blaskiewicz, J.M. Brennan, K.A. Brown, D. Bruno, R. Connolly, T. D'Ottavio, A. Dion, K.A. Drees, W. Fischer, C.J. Gardner, J.W. Glenn, X. Gu, M. Harvey, T. Hayes, L.T. Hoff, R.L. Hulsart, J.S. Laster, C. Liu, Y. Luo, W.W. MacKay, Y. Makdisi, M. Mapes, G.J. Marr, A. Marusic, F. Méot, K. Mernick, R.J. Michnoff, M.G. Minty, C. Montag, J. Morris, S. Nemesure, A. Poblaguev, V. Ptitsyn, V.H. Ranjbar, G. Robert-Demolaize, T. Roser, W.B. Schmidke, V. Schoefer, F. Severino, D. Smirnov, K.S. Smith, D. Steski, D. Svirida, S. Tepikian, D. Trbojevic, N. Tsoupas, J.E. Tuozzolo, G. Wang, M. Wilinski, K. Yip, A. Zaltsman, A. Zelenski, K. Zeno, S.Y. Zhang
    BNL, Upton, Long Island, New York, USA
  
  Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
RHIC operation as the polarized proton collider presents unique challenges since both luminosity and spin polarization are important. With longitudinally polarized beams at the experiments, the figure of merit is LP4. A lot of upgrades and modifications have been made since last polarized proton operation. A 9 MHz rf system has been installed to improve longitudinal match at injection and to increase luminosity. The beam dumps were upgraded to allow for increased bunch intensities. A vertical survey of RHIC was performed before the run to get better magnet alignment. The orbit control has also been improved this year. Additional efforts were put in to improve source polarization and AGS polarization transfer efficiency. To preserve polarization on the ramp, a new working point was chosen such that the vertical tune is near a third order resonance. The overview of the changes and the operation results are presented in this paper. 		 
slides icon Slides MOOCN3 [2.331 MB]  
 
MOOCN4
 Status of the KEKB Upgrade  
 
  • J.W. Flanagan
    KEK, Ibaraki, Japan
  
  In the first half of 2010, KEKB will stop operation for a high-luminosity upgrade that should last about three years. This major reconstruction includes, among other items, a new low-emittance optics, crab-waist collisions, a C-band linac, a damping ring, new vacuum chambers with better electron-cloud mitigation, a "charge swap" between the high- and low-energy rings, etc. The speaker will review the strategy and status of the KEKB upgrade, together with the expected luminosity performance of the upgraded collider.  
slides icon Slides MOOCN4 [3.421 MB]