Wednesday 17/10 (08:00 - 13:00) - Setting-up of the nominal (4 times 72 bunches) 25 ns LHC beam in the SPS (both transverse and longitudinal) until 450 GeV/c

Change of supercycle => LHC-FT500_PDOT_V1 => Please try and prepare the supercycle during the preceding shift!

Timing sequence Name => LHC25NS-18BP-0/1/3

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). Block the fast vacuum valves OUT in the injection and extraction areas (LSS1,LSS2,LSS6)

Equipment modifications for the MD:
- Changed accelerator mode for FT: no extraction 
- NORTH extraction off
- MST/MSE girders retracted
- Servo off
- Switched off TT20 AUXPS

Beam conditions: PSB users = LHC25A and LHC25B / PS user = LHC25 / SPS user = LHC25NS (RF MMI pointing to LHC25NS => See below how to do this)

RF MMI pointing to LHC25NS (method):

            - Working Sets

            - RF-MMI => SPS-MMI

            - Select context => SPS.USER.LHC25NS

            - View => Show devices description

- MMI target LHC25NS => Enabled and MMI target "previous one" => Disabled. To be done 2 times as it appears 2 times in the list

- Delay has to be set to 550

#injections = 1-4  (72 bunches) - Extraction from the PS w/o QKE58

N_b = 1.3 x 10¹¹ p/b

Transverse emittances (e^* < 3 mm)

Longitudinal emittance: e_L^* = 0.35 eV.s

• Setting-up of transfer and injection (pre-requisite: verify optics settings)
• Adjust kicker timing
• Inject, establish circulating beam
• Setting-up acceleration, measure tunes and chromaticity and correct
• Check instrumentation: BPMs, BCT, Fast BCT, LHC BPM, Head-tail monitor, Wire Scanner, IPM, Tune meas

Participants: OP, RF, ABP, BI

Wednesday 17/10 (13:00 - 21:00) - Studies in the longitudinal plane

Beam conditions: PSB users = LHC25A and LHC25B / PS user = LHC25 / SPS user = LHC25NS

#injections = 1-4 (72 bunches) - Extraction from the PS w/o QKE58

N_b = 1.3 x 10¹¹ p/b

Transverse emittances (e^* < 3 mm)

Longitudinal emittance: e_L^* = 0.35 eV.s

Contact person: T. Bohl

Wednesday 17/10 (21:00 - 24:00) - SPS-LHC re-phasing on the flat-top (450 GeV/c)

Beam conditions: PSB users = LHC25A and LHC25B / PS user = LHC25 / SPS user = LHC25NS

#injections = 1-4 (72 bunches) - Extraction from the PS w/o QKE58

N_b = 1.3 x 10¹¹ p/b

Transverse emittances (e^* < 3 mm)

Longitudinal emittance: e_L^* = 0.35 eV.s

Contact person: P. Baudrenghien

Thursday 18/10 (00:00 - 07:00) - Comparison of filling schemes 4x72 or 5x48 bunches

Beam conditions for 4x72 bunches: PSB users = LHC25A and LHC25B / PS user = LHC25 / SPS user = LHC25NS

Beam conditions for 5x48 bunches: PSB users = LHC25A / PS user = TSTLHC25 / SPS user = LHC25NS

#injections = 4 (with 72 bunches) or 5 (with 48 bunches) - Extraction from the PS w/o QKE58

N_b = 1.3 x 10¹¹ p/b

Transverse emittances (e^* < 3 mm)

Longitudinal emittance: e_L^* = 0.35 eV.s

Contact person: E. Métral, OP

Thursday 18/10 (07:00 - 12:00) - Study of the 75 ns beam (RF + transverse) + ecloud meas.

Beam conditions:  PSB users = LHC75A and LHC75B / PS user = LHC75 / SPS user = LHC75NS (RF MMI pointing to LHC25NS => See below how to do this)

RF MMI pointing to LHC25NS (method):

            - Working Sets

            - RF-MMI => SPS-MMI

            - Select context => SPS.USER.LHC25NS

            - View => Show devices description

- MMI target "previous one" => Disabled and MMI target LHC25NS => Enabled. To be done 2 times as it appears 2 times in the list

- Delay has to be set to 550

#injections = 1-4 (72 bunches) - Extraction from the PS w/o QKE58

N_b = 1.3 x 10¹¹ p/b

Transverse emittances (e^* < 3 mm)

Longitudinal emittance: e_L^* = 0.35 eV.s

Participants: OP, RF, ABP

Thursday 18/10 (12:00 - 14:30) - RF studies with coast at 26 GeV/c

Beam conditions:  PSB users = LHC75A and LHC75B / PS user = LHC75 / SPS user = LHC75NS

#injections = 1 (with only 1 PSB ring) - Extraction from the PS w/o QKE58

N_b = 1.3 x 10¹¹ p/b

Transverse emittances (e^* < 3 mm)

Longitudinal emittance: e_L^* = 0.35 eV.s

Coast at 26 GeV/c

Participants: E. Shaposhnikova

Thursday 18/10 (14:30 - 16:00) - Recovery from MD

• Setting-up of physics cycle => Send beam to physics at 16:00

Participants: OP

Author: Elias Métral - AB/ABP
Last update: Friday, October 19, 2007 02:12:38 PM
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