Accelerator Complex Status

P. Collier

Linac2, Booster and PSStartup 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.

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Problems During the Start-up PeriodIsolde : • 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 NewsCNGS:• 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.