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HERA Status March 2006 HERA-Experiments-Coordination March 28, 2006 F. Willeke, DESY

HERA Status March 2006 HERA-Experiments-Coordination March 28, 2006 F. Willeke, DESY. Luminosity Polarization Operations Developments Plans. Beam Currents. RF conditioning during injection seems to be successful so far  get to 39mA positron current quickly. Efficiency.

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HERA Status March 2006 HERA-Experiments-Coordination March 28, 2006 F. Willeke, DESY

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  1. HERA Status March 2006HERA-Experiments-Coordination March 28, 2006F. Willeke, DESY • Luminosity • Polarization • Operations • Developments • Plans HERA-Experim.-Coord.03/28/06

  2. Beam Currents RF conditioning during injection seems to be successful so far  get to 39mA positron current quickly HERA-Experim.-Coord.03/28/06

  3. Efficiency HERA-Experim.-Coord.03/28/06

  4. Specific Luminosities HERA-Experim.-Coord.03/28/06

  5. Luminosity Production HERA-Experim.-Coord.03/28/06

  6. Polarisation No change w.r.t. last year 30-40 % for the colliding, good polarization for non-colliding bunches Machine interested in flipping rotators one-by-one starting at next maintenance day HERA-Experim.-Coord.03/28/06

  7. H1 Backgrounds: Quick recovery of IR vacuum and gas induced p-backgrounds HERA-Experim.-Coord.03/28/06

  8. ZEUS p Backgrounds:improved by using complementary collimator set HERA-Experim.-Coord.03/28/06

  9. HERMES Target Cellnew target cell is heating up due to HOML‘s during 12GeV positron injection limits e beam intensity at present (~39mA) Synchrotron Radiation heating at 27.5GeV? HERA-Experim.-Coord.03/28/06

  10. Successful commissioning of longitudinal broad band damper system  short bunches (1ns) at 920GeV FWHM=2.8ns Bunchlength FWHM FWHM=1.1ns Beam energy Enhanced emittance growth (IBS, RF noise)  Need more RF voltage Factor of 2 reserve available  needs more work HERA-Experim.-Coord.03/28/06

  11. HERA Week #12 2006 Intergrated Luminosity: 7.9 pb-1 (Z), Peak : Lp 4.68 1031cm-2s-1 Efficiency: 73% ZEUS Backgrouind problems reduced Only minor technical problems HERA-Experim.-Coord.03/28/06

  12. Further Plans • Consolidate operations with high beam currents (>40mA positrons, 100mA protons) and high specific luminosity • Prepare luminosity optics with bxp:2.30, byp=16cm (& matched e-beam) • Use long feedback in routine operation • Increase RF Voltage by a factor of 2 • Increase the number of bunches to 180 to raise the intensity limitation by the HERMES target cell • Explore injection with frequency offset. • Maintenance day April 5 with IR warm-up North (and South?) HERA-Experim.-Coord.03/28/06

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