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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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  • 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


  • 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.

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.

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

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

Running with ‘Long’ FT + 3xCNGS

+ LHCPilot (When Needed)

+ MD Segment (week daytime)

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.