LHC progress week 19Monday 11th May 2015

Coordination: Jan Uythoven, Massimo Giavannozzi,

Mike Lamont

Week 19

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Monday 4th Optics measurements curtailedPower cut P4 - BY08 – access – BLM issues part II

Tuesday 5th Prep for collisions – SPS dipole

Wednesday 6th 15:00 beam back in SPSCollisions

Thursday 7th QPS/S78TDI set-up, 450 GeV loss maps

Friday 8th Curtailed optics meas. FTROF.A45B2Injection kicker - oilTransfer line collimatorsADT Set-up

Saturday 9th SnapbackDe-squeezeLocal aperture (PS POPS)RB67… cooling station BA6 – S12 cryo down

Sunday 10th Out all day – cryogenics recovery

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Availability

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NOT GOOD

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Faults

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SYSTEM/fault Start time End time OP DurationLHC » Vacuum » Interlock 04/05/2015 11:43 04/05/2015 12:16 33mLHC » Technical Services » Electrical Network 04/05/2015 11:43 04/05/2015 12:40 56mLHC » RF » Controls 04/05/2015 11:43 04/05/2015 12:40 56mLHC » Beam Instrumentation » BLM 04/05/2015 20:35 05/05/2015 03:19 06h 43mLHC » Beam Instrumentation » BPM 05/05/2015 03:40 05/05/2015 04:35 54mLHC » Injectors » No beam 05/05/2015 15:01 06/05/2015 12:54 21h 52mLHC » Technical Services » Cooling/Ventilation 06/05/2015 10:56 06/05/2015 12:48 01h 52m LHC » Injectors » No beam 06/05/2015 15:15 06/05/2015 17:06 01h 51mLHC » QPS » Controller 07/05/2015 03:28 07/05/2015 04:26 57mLHC » Injectors » No beam 07/05/2015 08:09 07/05/2015 08:16 07mLHC » Injectors » No beam 07/05/2015 10:29 07/05/2015 11:19 49mLHC » Injectors » No beam 07/05/2015 15:50 07/05/2015 15:55 05mLHC » Injectors » No beam 07/05/2015 16:04 07/05/2015 16:45 41mLHC » Injectors » No beam 07/05/2015 17:16 07/05/2015 17:18 01mLHC » QPS » Controller 08/05/2015 02:58 08/05/2015 07:35 04h 36mLHC » Injection » Hardware 08/05/2015 07:35 08/05/2015 10:23 02h 48mLHC » Power Converters » Controls 08/05/2015 10:34 08/05/2015 10:36 01mLHC » Injectors » No beam 08/05/2015 11:47 08/05/2015 12:47 59mLHC » Injectors » No beam 08/05/2015 15:56 08/05/2015 18:23 02h 27mLHC » SIS » Controls 08/05/2015 23:56 09/05/2015 00:04 08mLHC » Injectors » No beam 09/05/2015 00:01 09/05/2015 00:04 03mLHC » RF » Controls 09/05/2015 09:03 09/05/2015 09:04 01mLHC » Power Converters » Controls 09/05/2015 11:58 09/05/2015 12:21 23mLHC » Injectors » No beam 09/05/2015 18:16 09/05/2015 20:26 02h 10mLHC » QPS » Hardware 09/05/2015 19:57 09/05/2015 23:27 03h 30mLHC » Cryogenics » Cold compressor 09/05/2015 22:52 10/05/2015 23:27 24h 22m

Total fault time 79 h 45 m48% down-time

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Friday 8th May

• 12:45: Transfer line collimators– In parallel gated BBQ for tune measurements

commissioned– BLM latency measurement OK

• 19:00: Interlocked BPMs re-checked• 19:30: Set-up of transfer damper (ADT)

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Saturday 9th May

• 01:15: Ramp for snapback measurement• 7:50: de-squeeze and optics measurements• 13:00: Start local aperture measurements at the IPs• 18:15: Beam used, no new beam from PS• 19:45: Start pre-cycle

– RB.A67 tripped at 230A– problem with one of the redundant power supplies on QPS

crate removed the power permit. Probably a breaker has tripped. Access required…

• 22:45: …..cryo lost S12 due to water fault, water pumping station of BA6 is down…..

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Sunday 10th to Monday 11th

• 23:15 Cryogenics back (fault time: 24h22m)• 01:30 Ramp nominal– Losses around 20 s – horizontal Q’

• 03:00 Trip of the inner triplet due to loss of cryo in XL2. – After the recovery the cryo has been unstable and

we have been loosing the cryo start regularly for IT2, this time cryo maintain as well.

• 05:40 SPS injection septum in fault

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Now: optic measurements and correction: flat-top and squeezemany thanks to Rogelio and OMC for their flexibility

HIGHLIGHTS

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TDI set up and validated• Put TDIs at measured settings and cross-checked hierarchy wrt TCP (X-

measurement) • Validated also for injected beam in I&D with pilot applying different kicks to the

injected beam • Final settings:

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B1 TDI Angle (200 and 234 urad) B2 TDI Angle (281 and -429 urad

Chiara, Wolfgang, Linda & Florian

Ring Collimators

• Nominal injection settings deployed for all ring collimators in the injection beam process

• These are good for up to ~50 nominal bunches at 450-GeV

• Ramped up to coarse settings at flat top

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Collimation team

Loss maps

• With injection protection in and out• Full set and asynch dumps

– Example of off-momentum loss map, - 500 Hz• Looks good

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Collimation team

Momentum collimation

Collisions• Decided after Tuesday 8:30 meeting that for 450 GeV collisions

the tertiary collimators TCT should be moved in and verified by loss maps– Collisions found with 2 nominal– Use collision tunes– TCTs set-up @ 13

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Eventually after an SPS dipole change…

Transfer Line Collimators

• Started with steering the lines and establishing golden trajectories

• Had some issues with collimator controls to change settings of TCDIs - was solved with SW release

• New combined SPS cycle for pilot and nominal is not working for automatic scan application, have to use the pilot cycle for this measurement

• Will come back to proceed with the measurement of TCDI centres

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Chiara, Wolfgang and ABT team

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Transverse Damper

• Injection Oscillation fixed display works, it shows the first bunch of the injected batch

• Closed all 8 feedback loops with pilot bunches

• Closed all 8 feedback loops with nominal bunches

• Functions arrive correctly, minor changes in phase shifts, to be propagated to LSA

• Loops close/open at injection and beam dump events

• Still some work left

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Local Aperture Measurements• IR1:

– First losses observed on MQX with half crossing -430urad (due to B2). However, this step must be repeated because not clear losses were observed

– First losses observed on MQX with half crossing 500urad. Clear losses observed on C3R1 due to B2. – Regarding the separation plane, losses were observed with bumps of -400urad and +320urad.

• IR 2 only separation plane B1 due to limited beam availability– Regarding the separation plane, losses were observed with bumps of -490urad and +320urad.

• IR5: – Regarding the separation plane, losses were observed with bumps of +340urad.

DM, PH, GV + OP crew

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Gated BBQ for Tune measurement

• Aligned gate of B1 & B2 gated BBQ• The pilot is not seen by the gated BBQ - as predicted by Marek

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Wire scanners and K-modulation measurements continues – Maria Kuhn

Snapback and Q’• Start with pre-cycle

– chroma decay @ injection

• Expert comes in to look at tune signal change settings which were ‘lost’

11/05/2015 17Tune signal with freq. modulation over the ramp

Matteo

De-Squeeze: Smooth

• Played the full de-squeeze to collisions: • Ran the tune change QCHANGE BP to move to collision tunes• Ran the de-squeeze in one step with collision tunes• Ran the BP to adapt the crossing angles

– IR5 from 145 to 0, IR8 from 230 to 320 microrad• Ran the collision BP (all separations off)• Measured optics• When the optics is corrected (if needed) the sequence is ready for

nominal bunches and setup of collisions (and TCTs)

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Laurette, Ron, Jorg

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Status – quick summary

• Optics– Measured at intermediate squeeze points – in progress,

corrections to be applied • Collimation– Good to go at 450 GeV– Coarse settings in ramp and at 6.5 TeV

• Nearly ready for higher intensities at 450 GeV– quick test of the BETS-TCDQ to validate

• Nominal ramp – Work in progress

• ULO stable

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Incoming

• Finish optics measurements and corrections• High intensity at injection (up to 40 nominal)• Nominal ramp• Pilot ramp with constant collimators centres -

check at 6.5 TeV• ULO monitoring• …

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This week’s coordinators: Jorg Wenninger, Jan Uythoven