Week 39 - SPS Dedicated MD

Tuesday 25/09 (08:00 - 15:00) - Setting-up of the nominal (4 times 72 bunches) 25 ns LHC beam in the SPS (both transverse and longitudinal)

Change of supercycle => LHCMD25.92-55-270_PDOT_V2 (31.2 s long)

Timing sequence Name => LHC25NS-w/coast-0/1/3

Other 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&B / 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 with 12 bunches first up to 4 with 72 bunches - Extraction from the PS w/o QKE58

Nb = 1.3 x 1011 p/b

Transverse emittances (e* < 3 mm)

Longitudinal emittance: eL* = 0.35 eV.s

            => Check also that the timing SIX.MC-CTM is Enabled (CCV 425) in Timing New (it allows the instrumentation to work)

            - RF MMI / RF synchro / LHC25NS / Write / BU bunch 3847 (this value might change! => To be set-up) for the 1st injection => Put this value + 400 for the 2nd, + 2*400 for the 3rd and + 3*400 for the 4th one.

Participants: OP, RF, ABP, BI

 

Tuesday 25/09 (15:00 - 20:00) - Study of the effect of energy (and transverse beam emittances) on the electron cloud vertical fast instability at 55 GeV/c

Beam conditions: PSB users = LHC25A&B / PS user = LHC25 / SPS user = LHC25NS (RF MMI pointing to LHC25NS)

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

Nb = 1.3 x 1011 p/b

Transverse emittances (e* < 3 mm)

Longitudinal emittance: eL* = 0.35 eV.s

Contact person: G. Rumolo

 

Tuesday 25/09 (20:00 - 21:00) - Access to install two new signal cables on CH1 (SEM) and CH2 (IC after collimator) (Bend Dehning and others)

 

Tuesday 25/09 (21:00) – Wednesday 26/09 (01:00) Scrapers (at 270 GeV/c)

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

Nb = 1.3 x 1011 p/b

Transverse emittances (e* < 3 mm)

Longitudinal emittance: eL* = 0.35 eV.s

Coast at 270 GeV/c

Contact person: H. Burkhardt

 

Wednesday 26/09 (01:00 – 04:00)Study for the LHC BLMs

Beam conditions: PSB users = LHC25A&B / PS user = LHC25 / SPS user = LHC25NS (RF MMI pointing to LHC25NS)

#injections = 1 (12 bunches) - Extraction from the PS w/o QKE58

Nb = 1.3 x 1011 p/b (can be varied)

Transverse emittances (e* < 3 mm)

Longitudinal emittance: eL* = 0.3 eV.s

Coast at 270 GeV/c

Contact person: B. Holzer

 

Wednesday 26/09 (04:00 - 06:00) SPS-LHC re-phasing on the flat-top at 270 GeV/c

Beam conditions: PSB users = LHC25A&B / PS user = LHC25 / SPS user = LHC25NS (RF MMI pointing to LHC25NS)

#injections = 1-4 (12 and/or 72 bunches) - Extraction from the PS w/o QKE58

Nb = 1.3 x 1011 p/b

Transverse emittances (e* < 3 mm)

Longitudinal emittance: eL* = 0.35 eV.s

Contact person: P. Baudrenghien

 

Wednesday 26/09 (06:00 - 08:00)  - On-line modeling in the SPS with MADX in view of LHC

Beam conditions: PSB users = LHC25A&B / PS user = LHC25 / SPS user = LHC25NS (RF MMI pointing to LHC25NS)

#injections = 1 (12 bunches) - Extraction from the PS w/o QKE58

Nb = 1.3 x 1011 p/b (can be varied)

Transverse emittances (e* < 3 mm)

Longitudinal emittance: eL* = 0.3 eV.s

Coast at 270 GeV/c

Contact person: I. Agapov


Author: Elias Métral - AB/ABP
Last update: Tuesday, September 25, 2007 09:32:14 AM
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