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Accelerator Complex Status

Accelerator Complex Status. P. Collier. Linac2, Booster and PS Startup on-time, according to the schedule. Only minor problems Rapidly set-up the major beams for Physics users and LHC. CT transfer setup to SPS (MTE will come later)

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Accelerator Complex Status

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  1. Accelerator Complex Status P. Collier

  2. Linac2, Booster and PS • Startup on-time, according to the schedule. • Only minor problems • Rapidly set-up the major beams for Physics users and LHC. • CT transfer setup to SPS (MTE will come later) • Initially limited to low intensity in the PS due to work on the POPS X • SPS • Originally had a 1-week delay due to additional damaged cables in LSS2 discovered during the cable replacement campaign • Careful rescheduling during the machine-checkout allowed all activities to be completed more quickly • First beam could be taken on 23rd April as originally foreseen.

  3. Problems During the Start-up Period • Isolde : • Problem with the motorization of the GPS front end. Orphan equipment. Managed to find a spare card. Equipment now been taken over by EN-STI. • Rex run delayed due to a vacuum problem in the linac. • AD: • Target replacement revealed a problem with the target position – 6cm longitudinal misalignment. Was there during the whole of the 2008 run. Repaired in situ and re-aligned correctly. • SPS: • ZS (Electrostatic septum) replacement just before beam start. Had to be re-opened because of an alignment problem. • Inter-turn short in a main dipole developed during early operation. Magnet changed. • PSB: • Injection Septum developed a water leak into the vacuum. • Had run without problem for 30 years! • Spare magnets available – but as old as the original. Difficulties getting drawings together and tooling. • A few experts on the equipment still around to help. • Total time for repair 1 week.

  4. radiation levels damaged zone Not only radiation but also risk of contamination (overalls/gloves obligatory for work on “inside” components) Courtesy: J. Borburgh, V. Mertens TE/ABT

  5. Latest News • CNGS: • Set-up of the beam on the target and secondary beam optimization was delayed by the 1 week stop in the PSB. • However, very smooth startup once beam was available. • On Monday 1st June (start of CNGS physics) had 3xCNGS cycles with ~2x10+13 running. • Will progressively increase the intensity in the coming days. • AD: • AD Set-up is progressing well. The low intensity from the target (-20%) seen last year has gone. Beam already on the 100MeV/c plateau (85% transmission). • Extraction optimization is underway. • n-TOF: • Started taking beam on 26th May (1 week late to complete installation) • Presently taking reduced intensity (shielding problem). 1 dedicated cycle at 5x10+12 • Parasitic beam is set-up on the 2 available East cycles (Irradiations and North Branch) • SPS: • Beam Extracted towards LHC in both directions (TT60 & TT40) in preparation for Transfer line tests

  6. Running with ‘Long’ FT + 3xCNGS + LHCPilot (When Needed) + MD Segment (week daytime)

  7. Proton Sharing • Assuming 80% overall efficiency • SPS: • Can deliver 3.2x10+19 protons on CNGS target. • And ~0.5x10+19 protons to Compass (10+6 spills) • Beam to all other North users. • While delivering beam on request to LHC (several tests during the summer) • PS: • All the beams to SPS, plus … • 4-5 Cycles/Supercycle to Dirac – as requested. • Cycles to other East users according to the schedule • Beam to AD – every second Supercycle • n-TOF beam on 1 dedicated cycle + parasitic beam on all east users except Dirac. Can deliver ~7.6x10+18. • PS Booster: • All the beams to SPS and PS plus • Around 43% of PSB cycles to Isolde. • Will use frequent supercycle changes to optimize beam usage. • Takes account of Ion operation throughout the summer to complete the commissioning of the injectors for LHC ions.

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