Polarity inversion 07:00 ALICE solenoid and dipole polarity switched to positive External Crossing angle polarity unchanged at injection/ramp & squeeze.

Slides:



Advertisements
Similar presentations
LHC – week 48 finishing up the ioning Coordination: Gianluigi Arduini & Mike Lamont.
Advertisements

LHC Status Sat Morning 18-June Bernhard Holzer, Gianluigi Arduini et al Tentative Planning: Luminosity 1092 x 1092 Access: installing low pass filter at.
Tuesday 17 th April 04:00 Prepare second fill for v/d Meer scans. 06:22 Stable beams, v/d Meer scans for Alice and LHCb. 13:20 End v/d Meer scans.Dump.
RF observation from Saturday morning Observation of beam induced voltage/power following the two klystron trips: 03:18 3B1 just at end ramp, 1.26E14 p.
Thursday 20 th April 01:53 RCBV17.R7B2 tripped as happened few days ago: SIS intercepted. 05:54 Stable beams, 1380b, still RF problems B1, abort gap cleaning.
Monday – Morning L. Drosdal: Injection line TI8: IQC threshold for BPM H from 2mm to 2.5mm to avoid unnecessary latches due to variations.
Wednesday
Ralph Assmann, Giulia Papotti, Frank Zimmermann 25 August 2011
MD Planning Fri – Sat (26. – 27.8.)
Wednesday 8.9 External crossing angles:
Saturday Coordinators weekend: Mike Lamont, Eva Barbara Holzer
Wednesday :06 Dump fill 3533: interlock BPMS in IP6
Summary of week 40 Machine Coordinators: G. Arduini, M. Lamont
Day :00-11:30: Optics at 3.5 TeV Optics re-measured with AC-dipole. Excellent reproducibility. Small emittance increase from AC-dipole. Collapsed.
Last 24 hours RQ4.L1 Lost going into collision Test ramp Storm
Saturday 24 March 2012.
Wednesday September 14th
Friday 07:00 Power glitch on the EDF network. Point 8 affected.
Monday 11/07: Recovery Plenty of accesses.
02/08/ :35: Lost access chain in point 2 (PX24 PAD)  Dump after ~14.5 hours ~100 nb-1.
Overview LHC Operation Week 47
Week 46 Week 46: Machine coordinators: Roger Bailey – Gianluigi Arduini Main aims of the week: Stable beams with ions Scheduled stop for ion source refill.
Fill 1410 revisited Peak luminosity 1.4e32 Beam current 2.68/2.65 e13
LHC Morning Meeting - G. Arduini
Saturday 12:00 Fill 1992 in stable beams.
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.
Summary of week 44 Aims of week 44 J. Wenninger & J. Uythoven
LHC Morning Meeting - G. Arduini
Summary of Week 13 G. Arduini, B. Holzer
Summary of Week 16 G. Arduini, J. Wenninger
Mon 22/8 – Tue 23/8 00:07 stable beams #2040. Initial luminosities: 2.1x1033 cm-2s-1 18:00 Programmed dump. End of physics #2040. ~83 pb-1 in ~18 hours.
Coordination by E. B. Holzer & J. Wenninger Production
Mike Lamont, Jorg Wenninger
Saturday 2/4/ :00-09:00 Problems with SPS:
Wednesday 30th November 10:00 Access PZ33 for RP, Cryo, EPC, ELQA
Week 35 – Technical Stop and Restart
04-05/08/2010 End of physics at ~11:00 after 18.5 hours ~120 nb-1.
Wire almost entirely through beam before BLM triggers dump
LHC Morning Meeting - G. Arduini
Finally.... We had to wait a long time.... We had many problems....
Not the most productive 24 hours on record
Tuesday 22 November 2011.
Friday Morning 7:30 injection for fill 2908
Yesterday morning Held 1647 for a while – SPS kicker problem
Summary Thursday h21: Stable beams fill #1303.
Summary of week 19 Machine Coordinators: G. Arduini, M. Lamont Main aim: Luminosity production.
Tue/Wed 12/ :00 Probe beam back again
Thursday – Morning Energy matching at injection with H CODs
Monday 11th June 08:10 Beam dumped in the ramp by OP. OFB did not start its function and kept the injection orbit. 08:50 Switch LHCb polarity to negative.
Wednesday h10: Programmed dump. 07h54: Injection. 200b.
Saturday :42 stable beams fill 3541
Monday :15 fill 3523 dumped by BPMs IP6
LHC Morning Meeting - G. Arduini
Thu 04:00 Fill #2729 Stable Beams. Initial lumi 6.5e33 cm-2 s-1.
Summary Tuesday h23: Machine closed. Precycle started.
Tuesday 20 September 2011.
Thursday 30th September De-bunching test
Mon 2/4 08:00-13:00: Access for: Experiments Power converters BBQ
Saturday 06/11 Triplet R8 tripped during ramp for collision setup.
Coordination: Eva Barbara Holzer, Mike Lamont
Wednesday h18: 228b fill lost just before start of ramp.
Monday 26th September 7:30 Beam dump, QSP on RQX.R1, lost cryo in ITR1, 91 pb-1. Cryo recovery, needed about 1.5 h. Setting of TI2 collimators to 5 sigma.
Another Immortal Fill….
Monday 27th August & night
Friday :47 stable beams fill 3273
Tuesday End of fill 1393 Movement of suspicious Roman pots OK
Wed 12/10 09:30 – 10:30 Ramp down of ALICE solenoid to 50% nominal field on request of ALICE. Increase of the vacuum (e-cloud in this area that has not.
Saturday 26 November 2011.
HI2011 Commissioning Status
Saturday 29th October Friday during IP2 1 m squeeze test
Presentation transcript:

Polarity inversion 07:00 ALICE solenoid and dipole polarity switched to positive External Crossing angle polarity unchanged at injection/ramp & squeeze Crossing angle polarity switch when going in collision 12:00 TCT alignment check in point 2 after crossing angle polarity switch when going in collision 13:30-14:30: loss maps and asynch dump test Loss maps OK (S. Redaelli) although deterioration in the vertical plane B1

Asynch dump test (J.Uythoven) Dumped by OP switch 70 seconds after the RF OFF. Very little beam left for the asynch dump test. TCT losses are on the noise level. B1 TCT/TCDQ ratio < 2.2e-5 B2 TCT/TCDQ ratio < 3.5e-6 Abort gap population B1 3e8 charges and B2 1e9 charges, Did see abort gap populating when RF switched off. No significant losses at other places in the ring (from general PM). Asynch dump ok (JU).

RF status (P. Baudrenghien, T. Mastoridis) Fill 2325 (Sat 26/11): There were only 6 RF cavities during the fill in question. Unfortunately, the total RF voltage was not reduced sufficiently to accommodate the reduction of operating stations. So, each cavity was operating at 1.9 MV, thus leading to klystron saturation.   This saturation should not lead to drastic effects normally, so we cannot be positive that this is the source of the problem, but we are fairly certain.   We also don't see any indication that is related to the similar losses and debunching from last Sunday (Synchro Loop). New RF voltage for B1 (now identical to B2): capture with 8 MV, ramp to 12 MV as we (probably) will keep working with 7 cavities only in B1, I have changed the main coupler position from a QL=20 k to 25k to keep klystron power ~150kW with 7 cavities/8 MV total on B1. On beam 2 we have ~140 kW for 8 MV with 8 cavities at QL=20k. In physics all cavities at 60k, 12 MV/ring.

Tune feedback (R. Steinhagen) Checked Tune-FB response for various bandwidth: for a reduction factor of five (0.2) the tune (step) perturbation is taken out after about 30 seconds (90% to 10%). Programmed bandwdith changes are linear (as by design). Bandwidth reduction should reduce the maximum oscillation amplitude presently causing spurious QPS trips during the squeeze. Following squeeze done with tune feedback (BW reduced by factor 5) ON in both planes  no QPS trip and tune under control BW: 1 0.5 0.2 0.1

18:56 start collision and crossing angle polarity switch 19:11 Stable Beams #2332. Initial luminosity 5.1x1026 cm-2s-1 20:23 Beam dump due to RF trip (PLC problem). End of fill #2332. 1.9 ub-1 after 1.2 h

Cryo problem At 20:26 water level sensor of the cooling tower SF4 at pt 4 had a short-circuit, which resulted in an electrical shutdown of the tower (24V). This cut the water to the cryo and at 20:29 the cryo installation at pt 4 switched off. Loss of insulation vacuum on DSLC being investigated Recovery of cryo conditions not expected before 21:00 tonight. He release through the RF He release valves  ODH alarm 22:45 Trip of Sector 81 23:10 Access for Firemen intervention to reset ODH alarm and verification 00:30 Access for cryo in point 4 and in point 3

The door at P3 (PZ33) is broken and needs repair The door at P3 (PZ33) is broken and needs repair. The access team is preparing, and should start the repair at 8:30. First estimate is that this work will take 8 hrs After the door is fixed. a patrol of pt 3 will be needed, asthe PZ33 is forced. Until the repair of PZ33 door starts, a CSA Guardian is stationed at PZ33 to control access

Plans Access during day and implementation of new BLMs fir aperture investigations left of Point 2 Physics in the evening Wedensday: VdM scan and physics over night Thursday: ADT tuning and verification tests + Physics ~1 hour end-of-fill study to measure damping time at top energy Loss maps at injection using ADT (MD preparation) (max 1 h) “gating off” the ADT for the first batch injected for tune measurement (parasitic Friday: Aperture scan in point 2 at 3.5 TeV squeezed (<1 shift) during day then physics Physics during WE Quench MD Monday 5.12

Fill # Start Stable beams Duration [h] Initial lumi (Atlas) Int. lumi (Atlas) Reason Dump [hh:mm] [1026 cm-2s-1] [ub-1] 2317 Wed 13:15 4:57 4.1 4.5 Programmed dump 2318 Wed 21:53 5:36 4.6 5.5 2319 Thu 9:04 9:02 4.7 5.7 2320 Thu 22:45 5:23 5.0 2325 Sat 8:04 5:43 4.8 5.6 QPS, trip of RQF/RQD.A45 2327 Sat 19:58 0:34 5.2 0.9 LBDS Self-trigger 2328 Sun 0:03 6:08 5.3 6.4 2329 Sun12:29 6:18 4.9 6.2 2330 Sun 22:03 7:09 6.9 2332 Mon 19:11 1:12 5.1 1.85 RF trip, PLC