Presentation is loading. Please wait.

Presentation is loading. Please wait.

2011-10-05 LHC 8:30 meetingEBH 11 Wednesday 4 October 2011.

Published byMoses Larcher Modified over 10 years ago

Similar presentations

Presentation on theme: "2011-10-05 LHC 8:30 meetingEBH 11 Wednesday 4 October 2011."— Presentation transcript:

1 2011-10-05 LHC 8:30 meetingEBH 11 Wednesday 4 October 2011

2 2011-10-05 LHC 8:30 meetingEBH 2 12:12 dumped Fill # 2181 after 12:15 hours in stable beams Initial luminosity: 3.2e33 cm -2 s -1 Delivered luminosity: 92 pb -1 Operator Dump procedure started – but in the end the beam was dumped by RF interlock because RF was switched off When beam mode is changed to beam dump, the LHC page 1 displays the image of the last beam dump need to check the time stamp 12:44 Remote reset of an error on the QPS crate in S45 (B8L5) Plan was: 1 hour: RF test of new tuner firmware version for the 25ns MD 6 hours: abort gap cleaning commissioning (using the new RF firmware in order to test it at lower intensity beam) Physics Tuesday - Day

3 2011-10-05 LHC 8:30 meetingEBH 3 Problem with the new RF firmware and problem rolling back to the old version 14:54 – 17:12: BLM power supply in IP7 Abort gap cleaning cancelled and moved to Friday 14:00 – 20:00 17:52 RF firmware rolled back – ready to inject for physics 20:36 Stable beams for Fill #2182 Bunch intensity: 1.3E11 Peak luminosity: ~3.2e33 cm-2 s-1 Total luminosity delivered: ~71 pb -1 05:31 Dump: quench heaters discharged in MB10.L8 19:55 vertical OFB stopped at around 1.5TeV (BPM 31.L5 went bad) and was restarted after disabling this BPM New RF firmware corrected, some tests done, but not tested with beam.

4 2011-10-05 LHC 8:30 meetingEBH 4 Abort Gap population up to 1.38E10 for B1 (red curve) Correlated with losses in IP3 momentum cleaning B1 (green curve) Fill #2180 and #2181

5 2011-10-05 LHC 8:30 meetingEBH 5 TI operators need more information to find equipment owner quicker CCC TI minor event report: Piquet EL sur place, c'est un RACK qui fait déclencher se départ. Sur le rack le seul information écrit est: LHC TIMING Demande au LHC qui nous dit de contacter des personnes pour le timing. Apres multiples coups de fils on trouve que ce rack est en effet un rack de Beam Instrumentation. La personne en charge se rend sur place et trouve une alimentation défectueuse. Apres échange de l'alimentation tout est de nouveau OK. Suggestion: Afin d'améliorer cette situation (et ne pas perdre plus de 2 heures a chercher qui appeler) il faudrait indiquer sur le RACK qui ou quel groupe en est responsable.. BLM Power Supply in IP7

6 2011-10-05 LHC 8:30 meetingEBH 6 Some vacuum spikes left and right if IP2 – calming down afterwards Fill #2182

7 2011-10-05 LHC 8:30 meetingEBH 7 B1 lifetime dip started ~2min. before we optimised IP5, and at the time we started leveling ALICE to 0.7 (ub s)^-1. Bunch length increased for B1. CMS showed an increase of the difference between the arrival time of both beams at the IP of 0.15 ns which could be explained by the increase in bunch lenght of B1. No emittance growth in the transverse plane. BLM TCT left of IP5 reached 60% of dump level Losses on B1 – lifetime down to 5 hours

8 2011-10-05 LHC 8:30 meetingEBH 8 Philippe Baudrenghien: " At the start of Fill 2182, Beam 1 experienced abrupt losses, with signs of debunching (abort gap population and bunch lengthening). It was traced to noise in Cav1B1. Attached a figure showing noise in 1B1, Fast BCT loss, abort gap population jumping to 6E10 and bunch lengthening. The klystron polar loop in 1B1 tried to compensate a ~ 6 dB loss in the RF chain and would saturate causing significant noise. We switched the loop off for the rest of the fill and configured it off for next fills. Obviously the open-loop gain has dropped (visible from the degraded control of cavity field). The open-loop phase has drifted also. We need to run our optimization tools without beam to localize and cure the problem. N.B: The VME modulator card was replaced on Sept 19th on 1B1.

9 2011-10-05 LHC 8:30 meetingEBH 9 Losses on the batch of 12 bunches after Qh trim of +0.002 reducing by -0.001

10 2011-10-05 LHC 8:30 meetingEBH 10 Bunch Length and abort gap filling 7E10 protons in abort gap No Losses associated with second bunch lengthening

11 2011-10-05 LHC 8:30 meetingEBH 11

12 2011-10-05 LHC 8:30 meetingEBH 12

13 2011-10-05 LHC 8:30 meetingEBH 13 Wed (day): Large pile-up MD (9h) Wed (pm/night):Physics Thu (day):25 ns MD (12h) Thu (night):Physics Friday (day):Abort gap cleaning (6h) Fr(night), Sa, Su: Physics To be done: 1.ALICE test: solenoid to 0.2T (40% of nominal) at the end of a fill; stable beams for ½ - 1 hour 2.Loss map qualification for injection & physics Present tentative planning week 40

14 2011-10-05 LHC 8:30 meetingEBH 14

15 2011-10-05 LHC 8:30 meetingEBH 15

Download ppt "2011-10-05 LHC 8:30 meetingEBH 11 Wednesday 4 October 2011."

Similar presentations

Thursday 12 th April - morning Machine in access for a problem on the injection kickers… MKI2 problem – fuse - PFNs were properly charged but pulses were.

Thursday 12 th April - morning Machine in access for a problem on the injection kickers… MKI2 problem – fuse - PFNs were properly charged but pulses were.
8:16 SB 25ns dumped by RF; integrated lumi 0.6 nb-1. 9:14 BIC problem in TI8 and CMS recovering their tracker 10:09 Abort gap cleaning commissioning. 16:29.

8:16 SB 25ns dumped by RF; integrated lumi 0.6 nb-1. 9:14 BIC problem in TI8 and CMS recovering their tracker 10:09 Abort gap cleaning commissioning. 16:29.
Beam commissioning strategy 09-12-09 Global machine checkout Essential 450 GeV commissioning System/beam commissioning Machine protection commissioning.

Beam commissioning strategy Global machine checkout Essential 450 GeV commissioning System/beam commissioning Machine protection commissioning.
Wednesday 12 th September Pumping, removal of vacuum equipment from tunnel in the morning TOTEM & ALFA, RP movement tests: OK 11:50 pre-cycle started,

Wednesday 12 th September Pumping, removal of vacuum equipment from tunnel in the morning TOTEM & ALFA, RP movement tests: OK 11:50 pre-cycle started,
● 08:30 Loaded by mistake squeeze function to 2 m  Dumped beams ● 10:30-13:00 Test of new algorithm for long. Emittance blow-up to minimize oscillations.

● 08:30 Loaded by mistake squeeze function to 2 m  Dumped beams ● 10:30-13:00 Test of new algorithm for long. Emittance blow-up to minimize oscillations.
2011-08-02 LHC 8:30 meetingEBH 1  Cryogenics recovery in point 8  Meanwhile a couple of accesses:  MKI investigation on noise in IP2  Insulation Vacuum.

LHC 8:30 meetingEBH 1  Cryogenics recovery in point 8  Meanwhile a couple of accesses:  MKI investigation on noise in IP2  Insulation Vacuum.
Monday 21.3. 06h00: End of fill #1640: 3.7 pb -1. 06h14: RB S12 and S23 tripped before loading rampdown table, active filter. MPE piquet. Fip_Com_Lost.

Monday h00: End of fill #1640: 3.7 pb h14: RB S12 and S23 tripped before loading rampdown table, active filter. MPE piquet. Fip_Com_Lost.
05:31 Beam dump due to QPS trigger in sector 78.  Quench heaters discharged in MB10.L8. 07:28 Quench heaters charged ok again in cell B10L8.  Was a EN/EL.

05:31 Beam dump due to QPS trigger in sector 78.  Quench heaters discharged in MB10.L8. 07:28 Quench heaters charged ok again in cell B10L8.  Was a EN/EL.
Nominal intensity bunches ● First ramp with nominal intensity bunches suffered from an instability appearing around 1.8 TeV. ● Nominal intensity bunches.

Nominal intensity bunches ● First ramp with nominal intensity bunches suffered from an instability appearing around 1.8 TeV. ● Nominal intensity bunches.
00:15: Stable beams fill 1883, 1.1E33 cm-2s-1.  Seems the 144 bunches beam 1 doe not fit properly on the injection kicker waveform. Systematically the.

00:15: Stable beams fill 1883, 1.1E33 cm-2s-1.  Seems the 144 bunches beam 1 doe not fit properly on the injection kicker waveform. Systematically the.
Fri – Sat - Sunday 30 Sept - 2 nd October Friday  06:00 Operator dump fill #2171, integrated lumi 75 pb-1.  90 m  * optics Optics ok, collisions at.

Fri – Sat - Sunday 30 Sept - 2 nd October Friday  06:00 Operator dump fill #2171, integrated lumi 75 pb-1.  90 m  * optics Optics ok, collisions at.
Monday 30.05. 01:00 Injection for physics fill #1816 02:00 Stable beams fill #1816, luminosity ~1.2x1033 cm-2s-1 11:08 Beams dumped. QPS trigger on detector.

Monday :00 Injection for physics fill # :00 Stable beams fill #1816, luminosity ~1.2x1033 cm-2s-1 11:08 Beams dumped. QPS trigger on detector.
09:25 Operator dump fill #2178, integrated lumi 107/108/18 nb-1. Trip of RQ4.R6 (fire heaters discharged) just after the beam dump but the QPS gave no.

09:25 Operator dump fill #2178, integrated lumi 107/108/18 nb-1. Trip of RQ4.R6 (fire heaters discharged) just after the beam dump but the QPS gave no.
Tuesday 24 th July - morning 10:15 Operator dump of fill 2873  Initial luminosity: 5.83e33 cm-2s-1  12 hours stable beams  151 pb-1 delivered  Initial.

Tuesday 24 th July - morning 10:15 Operator dump of fill 2873  Initial luminosity: 5.83e33 cm-2s-1  12 hours stable beams  151 pb-1 delivered  Initial.
Lumi scan limits checked (in preparation for next fill VdM scans).  Trims of up to 150 um per beam in IP1 & IP2 both planes both beams were done (IP5.

Lumi scan limits checked (in preparation for next fill VdM scans).  Trims of up to 150 um per beam in IP1 & IP2 both planes both beams were done (IP5.
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.

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.
Injection issues overnight 10:50 Access  QPS & EPC  Vacuum leak SPS – magnet to be replaced Monday – cycling for FT and LHC only over the weekend 12:15.

Injection issues overnight 10:50 Access  QPS & EPC  Vacuum leak SPS – magnet to be replaced Monday – cycling for FT and LHC only over the weekend 12:15.
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.

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.
07:27 Beams dumped in ramp  Energy error… SIS  The telegram information on the energy was missing for a few seconds, effectively freezing the energy.

07:27 Beams dumped in ramp  Energy error… SIS  The telegram information on the energy was missing for a few seconds, effectively freezing the energy.
Tue 23/8 – Wed 24/8 09:00 Start 90 m optics run – Preparation and verification of the collimation functions – Re-generation of functions for Transverse.

Tue 23/8 – Wed 24/8 09:00 Start 90 m optics run – Preparation and verification of the collimation functions – Re-generation of functions for Transverse.

Similar presentations

Ads by Google