Wednesday 22/08 (08:00 - 13:00) - Setting-up of the nominal cycle with LHC beam

Change of supercycle => LHC-FT500_PDOT_V1

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)

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

• 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 22/08 (13:00-19:00) - Achieving nominal longitudinal beam parameters + Beam quality checks

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 22/08 (19:00) - Thursday 23/08 (03:00) - 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 = 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: E. Métral, OP

Thursday 23/08 (03:00-04:00) - Setting-up of the cycle with Pilot beam

Beam conditions: PSB user = LHCPILOT / PS user = LHCPILOT / SPS user = LHC25NS (RF MMI pointing to LHCPILOT => See below how to do this)

RF MMI pointing to LHCPILOT (method):

            - Working Sets

            - RF-MMI => SPS-MMI

            - Select context => SPS.USER.LHC25NS

            - View => Show devices description

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

- Delay has to be set to 550

#injections = 1  (1 bunch)  - Extraction w/o QKE58

N_b = 5 x 10⁹ p/b

Transverse emittances (e^* = 3 mm)

Longitudinal emittance: e_L^* = 0.3 eV.s

Participants: OP, RF, ABP, BI

Thursday 23/08 (04:00-08:00) - Non-linear chromaticity measurements all along the cycle

Beam conditions: PSB user = LHCPILOT / PS user = LHCPILOT / SPS user = LHC25NS (RF MMI pointing to LHCPILOT => See below how to do this)

RF MMI pointing to LHCPILOT (method):

            - Working Sets

            - RF-MMI => SPS-MMI

            - Select context => SPS.USER.LHC25NS

            - View => Show devices description

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

- Delay has to be set to 550

#injections = 1  (1 bunch)  - Extraction w/o QKE58

N_b = 5 x 10⁹ p/b

Transverse emittances (e^* = 3 mm)

Longitudinal emittance: e_L^* = 0.3 eV.s

Contact person: R. Tomas

Author: Elias Métral - AB/ABP
Last update: Wednesday, August 22, 2007 10:22:16 AM
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