Monday fill with 1092 bunches (6 h stable beams)

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PROFIBUS controller problem (SEU) on cryo valve on DFBMH (600 A circuit RQ6.L7B1/2). Loss of cryo maintain ==> Beam dump. End of fill #1975 after ~2.5.

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21/05/2012LHC 8:30 meeting Overview Week 20 Injectors, LHCb polarity, Beam-Beam Coordinators: Bernhard Holzer, Jan Uythoven.

LHC 8:30 meetingEBH 1  Cryogenics recovery in point 8  Meanwhile a couple of accesses:  MKI investigation on noise in IP2  Insulation Vacuum.

08h15: Injection.  Correction injection oscillations.  Transfer line steering.  Losses at 30% of dump threshold, limited by SPS scraping. 12h35: Start.

07:00 Dump fil #2219, 123 pb -1 delivered. Trim TDI parking position to +/- 55 mm in the collimator BP trimmed the temperature kicker limit to 62 degrees.

:30 meetingEBH 1  No beam during the morning:  4:15 – 9: V distributor: Recovery after electrical interruption  access for TI services.

Monday – Morning L. Drosdal: Injection line TI8: IQC threshold for BPM H from 2mm to 2.5mm to avoid unnecessary latches due to variations.

Saturday Coordinators weekend: Mike Lamont, Eva Barbara Holzer

Wednesday :06 Dump fill 3533: interlock BPMS in IP6

Machine Coordinators: G. Arduini, J. Wenninger

Saturday :12 Stable beams fill 3351 Initial luminosity

Friday 15th June 01:11 Injection.

LHC Morning Meeting - G. Arduini

Saturday 09:40 Stable beams #1369 (56 bunch scheme)

Tue :25 Beams dumped due to RF vacuum interlock

Saturday 12:00 Fill 1992 in stable beams.

Summary of Week 11: 14 – 21 March

Fri 29/7 – Sat 30/7 09:00 End of fill 1990, PC trip RCBXV3.R1 (likely SEU on QPS). Integrated Luminosity: 41 pb-1. Access for MKI2 main switch replacement.

LHC Morning Meeting - G. Arduini

Wednesday 31 October: Morning

Summary of Week 16 G. Arduini, J. Wenninger

Note: squeeze in Atlas, CMS, LHCb and Alice on going

Friday 31st August & night

Thursday 10th May - morning

Friday Morning 3:44 – 15:04 stable beams Fill (dumped by operator)

LHC Operations overview Week 28 – Getting back

Summary of Week 26 Main aims: G. Arduini, B. Holzer, M. Lamont

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Tuesday 9th November 10:02 Fill beams dumped

Finally.... We had to wait a long time.... We had many problems....

Friday Morning 7:30 injection for fill 2908

Wednesday 9:08 Fill 3214 dumped by OP after 5:26 hours in stable beams

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Monday – Morning Fill 3265 stable beams since 1:31

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Monday morning 09:40 Dump fill 2838, integrated ~130 pb-1.

Thursday 22 September 2011.

Saturday :42 stable beams fill 3541

Monday Fill 1803 into stable beams at 9:30. Dump at 19:45.

Sat 15/10 New record bunch population profiting of the scrubbing period on Friday. Nb~1.42x1011p/bunch  110 MJ at 3.5 TeV. Filling slowed down by ZS sparking.

Tuesday 20 September 2011.

LHC Status Fro Morning 9-Sep

Saturday 24 September 2011.

Saturday 06/11 Triplet R8 tripped during ramp for collision setup.

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Thursday 20th July - morning

Friday h55 Stable beams. Fill #1841. Lumi ~1.2e33.

Tuesday 24/5 Fill # :00 Stable beam fill # bunches

Monday 27th August & night

Wednesday 26 October 2011.

Saturday 6th October 05:38 STABLE BEAMS # :06 OP dump

Saturday 28th 08:17 Fill #1812: Stable beams, peak luminosity ~1.1x1033 cm-2s-1 19:00 Go to adjust for RF-checks; Record fill lumi of 31.7 pb-1 for CMS.

Saturday Luminosity production 1380 bunches

Saturday 26 November 2011.

Thursday 10:00 Fill 1986 in stable beams.

Sunday 12th 00:29 Stable beam fill #1864. Initial lumi 1.1e33

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Presentation transcript:

Monday 18.7.2011 1 fill with 1092 bunches (6 h stable beams) 3 fills with 1380 bunches (20 minutes in stable beams)

Fill # 1955 9:49 Dump: RQTL7.L7B1 tripped fill #1955 Integrated luminosity [pb-1]: Atlas: 18.8 CMS: 18.7 LHCb: 6.1 Remote reset of the QPS crate on RB.A81 Unusually high temperature on collimator TCSG.D4L7.B1 (position “right up”) without beam: 55 deg  interlock masked

Fill # 1955

Fill # 1956 11:55 beam injected: Re-adjusting BPM phasing (E. Calvo) Tune, chromaticity MKI kicker length checked by M. Barnes Emittance(inj): ~ 2.5 μm rad bunch intensity: ~ 1.2E11 Beam Intensity: 1.66E14 Injection Beam 1 MSIB: 54% of BLM threshold Transfer line: BPM partly missing – partly high oscillations

Fill # 1956 Waited 1 hour after injection for UFO’s to calm down trip of RCD.A56B1 and RCO.A56B1 during the ramp, beam survived  reset and reloaded at flat top Not obvious to find target luminosity Alice 15:40 DUMP: Cryo lost probably due to SEU on a thermometer at a current lead (beam2 IP5).

Fill # 1956

Fill # 1957 Injection: MKI vacuum B2: spike of 1.5E-8 bar Injection losses B1 up to 70% of BLM threshold (MSIB) Wait ½ hour for UFO’s to calm down Emittance(inj): ~ 2.2 μm rad bunch intensity: ~ 1.3E11 Beam Intensity: 1.77E14 Energy/Beam: 100 MJ 35% of BLM threshold on TCTVB.4L2 83s integration time  consider adapting 83s thresholds

Vacuum up to ~2E-7 mbar in IP3 and IP7

Fill # 1957 BRAN Luminosity 1.4 – 1.5 But only for a couple of seconds

Fill # 1957 DUMP: BLM voltage status interlock in IP7 caused by high losses when going in collision

Fill # 1958 Wait ½ hour after injection for UFO’s to calm down Emittance(inj): ~ 2.0 μm rad bunch intensity: ~ 1.2E11 Beam Intensity: 1.66E14 mask the BLM HV status interlock in IP7 in the SIS for the first minutes of the collisions BLM_SR7_C_HV_STATUS would have given an interlock when adjusting LHCb luminosity Atlas and CMS adjustment before went without large losses Alice adjustment afterwards without big losses Alice optimized: factor 10 below target luminosity

IP7: Vacuum spike and BLMs in warning when adjusting LHCb

New record luminosity … but not for long 22:39 beam dump: cryo lost in sector 3-4

Beam back: this afternoon Alice collision scheme? PLAN Beam back: this afternoon Alice collision scheme? Luminosity production with 1380 bunches Adiabatically decrease emittance and increase bunch intensity BLMs: adapt 83s collimator thresholds SIS HV interlock?