Week 29 - Injector Long MD Monday 13/07 08:00 to Thursday 16/07 08:00

 

- Change of SPS supercycle: MD_26_120_L18000_2009_V1 (15 BP = 18 s) => 120 GeV/c coastable

- SPS user = LHC2

- RF MMI target = LHCMONO (and then LHC25NS when we will have the 25 ns beam)

- Timing sequence in the CBCM = LHC2-0/1/2

 

During the time the SPS takes only 1 PS LHCINDIV cycle (see detailed planning below), // MDs can take place in the PS:

- The Long LHC cycle (in case of problem with the motor/generator set) on Monday 13/07 (Y. Papaphillipou)

- Tests with the newly cabled radial loop pick-ups SS36 and SS76 + Setting-up of the LHC25 cycle on Tuesday 14/07 (H. Damerau)

 

Pre-requisites => Will be done during the access on Monday 13/07 between 16:00 and 17:00

- The interlock threshold on the temperature of the MKE kickers should be ~ 90º C (it should be ~ 70º C when there are extractions) => No need to call Etienne Carlier anymore as it is done in SIS.

- During (the scrubbing run and) the LONG MDs with LHC beam the ZS are RETRACTED / HV to 0 kV / ION TRAPS ON (inform the ZS expert). The cooling circuit for the septa magnets (circuits 214, 414 and 614) should be switched OFF (by TI from the CCC). Block the fast vacuum valves OUT in the injection and extraction areas (LSS1, LSS2, LSS4 and LSS6) => Giovanna Vandoni (TE/VSC, 163269 => ~ 20 min) will take care of this (also after the MD to come back to the initial situation). The list of the 11 valves VVFA and VVFB to be blocked during the MD are:

BA 1 :  VVFA 11901

BA 2 :  VVFA 21701, VVFB 21877, VVFB 21802

BA 4 : VVFA 41638

BA 6 / TT 60 : VVFA 610213, VVFA 61957, VVFA 61637, VVFA 61460, VVFB 61802, VVFB 61877

- For the coast, mask the following SIS interlocks: KICKERS_SPSRING (essentially for the MKD_EARLY_ENABLED), switch off the MDSH119 (otherwise it will trip), POWER_CONVERTERS_TT10 (as some could trip during the coast) and BLRING_DUMP_CHANNEL_VETO.

- The magnets with the e-cloud monitors are 4 dipoles: MDHW51832, 51836, 51838, 51853, all with 0.12 T (MDHW51832 with 25 A). In addition, there is a C-magnet (MDPH51753 with 28.5 A, in series with 754 to compensate) which contains a sample which can be inserted and removed .

 

- Monday 13/07 (08:00 - 11:00) - Setting-up of the 120 GeV/c coastable cycle (OP, RF and ABP)

Beam conditions: PS user = LHCINDIV and PSB user = LHCINDIV

#bunches = 4 (i.e. 4 PSB rings)

Nb ~ 1E11 p/b

Transverse emittances: e* < 3 microm

Longitudinal emittance: eL* = 0.35 eVs

- Monday 13/07 (11:00 - 15:00) - BI studies (R. Steinhagen)

- Monday 13/07 (15:00 - 16:00) - Cool-down time for SPS&PS tunnel accesses + SPS LSA release (G. Kruk) + LINAC2 source studies (R. Scrivens)

- Monday 13/07 (16:00 - 17:00) - SPS accesses (BA5 for BBLR, RadMon for UA9...) + PS accesses (SEMwire 48)

- Monday 13/07 (17:00) to Tuesday 14/07 (09:00) - UA9 (crystal) with a white noise excitation (W. Scandale)

- Tuesday 14/07 (09:00 - 13:00) - BI studies (R. Steinhagen)

- Tuesday 14/07 (13:00) to Wednesday 15/07 (01:00) - Instability in double RF system for SPS and LHC (E. Shaposhnikova)

- Wednesday 15/07 (01:00 - 11:00) - BBLR (compensation with full wires) with controlled transverse emittance blowup (G. Sterbini)

- Wednesday 15/07 (11:00 - 15:00) - Setting-up of the high-intensity on the nominal LHC cycle, as used during the 1st Long Injector MD (OP, RF and ABP)

Beam conditions: SPS user = LHC1, PS user = LHC25 and PSB user = LHC25A&B

# batches (bunches) = 1-4 (72)

Nb ~ 1.3E11 p/b

Transverse emittances: e* < 3 microm

Longitudinal emittance: eL* = 0.35 eVs

- Wednesday 15/07 (15:00 - 23:00) - Studies of the 3 coated MBB magnets, with local transverse bumps (E. Shaposhnikova)

- Wednesday 15/07 (23:00) to Thursday 16/07 (07:00) - BBLR (compensation with full wires) with controlled transverse emittance blowup on the 120 GeV/c cycle  (G. Sterbini)

- Thursday 16/06 (07:00 - 08:00) - Recovery from MD in the SPS (OP)

- Change of supercycle

- Send beam to physics at 08:00

Author: Elias Métral - AB/ABP
Last update: Wednesday, July 15, 2009 11:44:56 AM
Copyright CERN