1 / 14

RHIC APEX & LARP

RHIC APEX & LARP. Vladimir Shiltsev FNAL/APD. PHOBOS 10:00 o’clock. BRAHMS 2:00 o’clock. Jet Target 12:00 o’clock. RHIC. PHENIX 8:00 o’clock. STAR 6:00 o’clock. RF 4:00 o’clock. LINAC. NSRL. Booster. AGS. Tandems. RHIC high L(polarized) hadron collider.

purity
Download Presentation

RHIC APEX & LARP

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. RHIC APEX & LARP Vladimir Shiltsev FNAL/APD

  2. PHOBOS 10:00 o’clock BRAHMS 2:00 o’clock Jet Target 12:00 o’clock RHIC PHENIX 8:00 o’clock STAR 6:00 o’clock RF 4:00 o’clock LINAC NSRL Booster AGS Tandems RHIC high L(polarized) hadron collider Operated modes (beam energies): Au–Au 10, 28, 31, 65, 100 GeV/n d–Au* 100 GeV/n Cu–Cu 11, 31, 100 GeV/n p–p 11, 31, 100, 205, 250 GeV Possible future modes: Au – Au 2.5 GeV/n (AGS, SPS c.m. energy) p – Au* 100 GeV/n (*asymmetric rigidity) Achieved peak luminosities (100 GeV, nucl.-nucl.): Au–Au 581030 cm-2 s -1 p–p 351030 cm-2 s -1 Other large hadron colliders (scaled to 100 GeV): Tevatron (p – pbar) 231030 cm-2 s -1 LHC (p – p, design) 1401030 cm-2 s -1 APEX Mtg 11/02/2006 - Shiltsev

  3. Performance limitations with partial to-do list • Intra-beam scattering (heavy ions) • Low dispersion lattice • Stochastic (in progress) and electron cooling at 100 GeV/n • Dynamic pressure rise from electron clouds • NEG coating of warm sections  • Pre-pumping of cold sections  • Instabilities (at transition) • Adjust chromaticity (chromaticity jump?) • Reduce electron clouds • Fast transverse damper • Beam-beam (light ions and protons) • Eliminate ~10 Hz orbit oscillation (in progress) • Non-linear chromaticity correction (in progress) • New working point ? • Electron lens ?? • Polarization (protons) • AGS: strong partial snake  • AGS: horizontal tune in spin tune gap (in progress) • RHIC: 100 GeV:  • RHIC: 250 GeV: ring alignment, orbit correction APEX Mtg 11/02/2006 - Shiltsev

  4. Run-7 (President Budget request) (Q3) 30 weeks of cryo operation ½ week warm-up 12 weeks of A-A physics 10 weeks p-p physics 3 week set-up/ramp-up A-A 3 weeks set-up/ramp-up p-p 1 ½ week cool down 80K to 4K • Over last five years reduced cool-down/warm-up from 5 weeks to 2 weeks and reduced set-up/ramp-up from 2x5 weeks to 2x3 weeks  total reduction of operations overhead from 15 weeks to 8 weeks per year! • LN2 cooler, He refrigerator improvements • Automation, beam-based feed-back APEX Mtg 11/02/2006 - Shiltsev

  5. Goals for RHIC Enhanced Design Performance (~2008*) (Q4) * First 250 GeV p-p physics run currently scheduled for 2009. APEX Mtg 11/02/2006 - Shiltsev

  6. LARP Accel Systems Progress ‘06 • Schottky being baked, will go into LHC tunnel • TCFB: success at SPS • 4 long-term hardware commissioners @CERN • SLAC joins commissioning forces • LHC@FNAL to open in Nov’07, new - LAFS • RC work at full speed, a lot of changes, delay • SPS beam studies: BBQ PLL, Q’ head-tail, bent crystal, etc • Wires built for RHIC tests • # of LARP presentations at Valencia workshop APEX Mtg 11/02/2006 - Shiltsev

  7. Accelerator Systems FY07 Priorities • Lumi-Monitors: build,install, start commissioning, RHIC test • Tune&Coupling FB: deliver design, participate in installation and commissioning • Schottky: participate in installation and commissioning • Hardware Commissioning: execute current plan – SAFELY! • Beam Commissioning: develop acceptable/detailed execution plan for FY08+ by mid-07 (more from BNL!) – Todd, Mei • Physics experiments: RHIC (BBLR), Tevatron(PLL), ecloud • Other tasks: execute Task Sheet’s Plans APEX Mtg 11/02/2006 - Shiltsev

  8. wires (2.5m long) with strong-back (-profile)7 support points NEG coated chambersduring assembly RHIC BBLR wires – assembly APEX Mtg 11/02/2006 - Shiltsev

  9. Planned test with RHIC BBLR wires (WF) • Better signal from LR interaction(include head-on BB as another nonlinearity, larger chromaticity) • RHIC BBLR wire commissioning(may be partially parasitic to operation, may improve collimation) • Use wires to simulate LHC-like conditions(wires designed for LHC strength, beam lifetime better than in SPS tests) • Test compensation of single LR interaction (in presence of head-on collision, need protons) • Test pulsed power supply [not in 2007](confirm that beam lifetime is not negatively affected) APEX Mtg 11/02/2006 - Shiltsev

  10. Lumi-Mon Noise w. and w/o beam (Angelika D) 0.1mV 100mV no beam beam, 1 rev. APEX Mtg 11/02/2006 - Shiltsev

  11. Noise Problem (w. beam) 5 MHz/div 20 db/div 9.5 MHz 19 MHz 28 MHz 46 MHz APEX Mtg 11/02/2006 - Shiltsev

  12. ??? APEX Mtg 11/02/2006 - Shiltsev

  13. Estimate of SyncRad Suppression effect (WF) Energy loss from synchrotron radiation ~ Z2,makes heavy ions in RHIC particularly interesting [H. Burkhardt, CERN] APEX Mtg 11/02/2006 - Shiltsev

  14. AGS “Cooling” (Mike Bl) In the mid 90s Willem Van Asselt observed a narrowing of the IPM profiles with gold beams over the AGS injection porch. The time scale was of order one second and the data were seen by several people. In 1995 K. Kilian published a paper suggesting that collisional excitation of electronic states could cool beams. A very cursory AGS study in 2005 showed no emittance reduction. Theory has been pessimistic. C-A/AP/230 IPM neutralization??; IBS ?? APEX Mtg 11/02/2006 - Shiltsev

More Related