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Thursday 10.6

Date post: 31-Dec-2015
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Thursday 10.6. Plan for the day: Night from Wed-Thursday: Ramp optimization. Morning: Controlled longitudinal emittance blow-up. Afternoon: Transverse feedback system commissioning. Night: Squeeze commissioning & preparation for collimation set-up at 3.5 TeV - PowerPoint PPT Presentation
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Plan for the day: Night from Wed-Thursday: Ramp optimization. Morning: Controlled longitudinal emittance blow-up. Afternoon: Transverse feedback system commissioning. Night: Squeeze commissioning & preparation for collimation set-up at 3.5 TeV 06:30 : Medium intensity ramp – 8E10 Looks much better than one nominal bunch. Emittances of 3 mm at start of ramp, 5 mm at end of ramp. Colliding at b* = 10 m. Coupling around 2 10 -3 . Stable collisions, lifetimes 25-125 hours. B2V emittance to 10 mm, other planes stable. Luminosity 4 10 28 cm -2 s -1 in ATLAS and CMS (1 colliding pair). with 1.2 10 29 cm -2 s -1 with b* = 3.5 m Thursday 10.6 1 8:30 meeting
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● Plan for the day:– Night from Wed-Thursday: Ramp optimization.– Morning: Controlled longitudinal emittance blow-up.– Afternoon: Transverse feedback system commissioning.– Night: Squeeze commissioning & preparation for collimation set-up at 3.5 TeV

● 06:30 : Medium intensity ramp – 8E10– Looks much better than one nominal bunch.– Emittances of 3 mm at start of ramp, 5 mm at end of ramp.– Colliding at b* = 10 m. Coupling around 2 10-3.– Stable collisions, lifetimes 25-125 hours. B2V emittance to 10 mm, other

planes stable.– Luminosity 4 1028 cm-2 s-1 in ATLAS and CMS (1 colliding pair).

with 1.2 1029 cm-2 s-1 with b* = 3.5 m could reach 1 1030 cm-2 s-1 with 8 bunches 8 1010, b* = 3.5 m.

Thursday 10.6

1 8:30 meeting

Orbit and Tune Correction during Ramp

8:30 meeting 2

Bunch length during ramp

8:30 meeting 3

1 Colliding pair of 8E10, b* 10 m

8:30 meeting 4

● 10:15 : End of fill

● 12:00 : New injection 7e10 per beam for RF studies– 13:13: MPS problem in PS, no beams for a while– 15:30: PS and SPS ready again for new injections– 15:50: SPS preparing for high intensity beams with increased long. emittance– 16:45: Injection of high intensities into LHC

● 17:20 : New ramp – 8E10– 17:30: lost 2B2 and 3B2 cavities leading to bad beam lifetime (7h compared to

170 h for Beam1) and increased bunch length.– Beam2 cavities keep tripping after resets!– continuous losses in IR3 and IR7 (large emittances)– The B1 bunch length evolved as designed and reached 1.5 ns.

Thursday 10.6

5 8:30 meeting

● 18:45 : Collapsing separation bumps:– ATLAS: BRAN rate = 550 Hz; Luminosity 3.8 1028 cm-2 s-1

– CMS: BRAN rate = 770 Hz; Luminosity 3.8 1028 cm-2 s-1

– Attempt to collapse separation bump in ALICE leads to beam losses

● 19:30 : Dumped both beams to prepare new fill for damper studies– Beam dump of Beam 2 gives XPOC error. Probably due to un-bunched beam

caused by RF problems

● 20:43 : QPS not OK for RB.A23– requires access; QPS communication problem on MB29.R2– tracked down to a bad contact access finished at 00:00.– 01:30 ; Pre-Cycle finished

Thursday 10.6

6 8:30 meeting

Bunch length during second ramp

8:30 meeting 7

Beam losses during second ramp

8:30 meeting 8

1 Colliding pair of 8E10, second ramp

8:30 meeting 9

Friday 10.6

10 8:30 meeting

● 02:30 : Starting Damper studies– The new firmware for the multi-bunch feedback had a negative side effect

(programming of coarse delay not working) which means one cannot advance with it.

● 05:00 : Start preparing new fill for Collimator setup– problems with PS-SPS synchronization jitter– some problems in SPS with longitudinal beam blow-up

● Program for today:– Morning: Collimator setup at 3.5 TeV.– Afternoon: Controlled longitudinal emittance blow up on ramp.– Night: Transverse damper studies– Saturday morning: Collimator setup at 3.5 TeV.

Friday 10.6

11 8:30 meeting

● Open Issues:– RCD.A45B2 and RCBXH1.R1 require QPS board change (running on board B)

– MKI in IR2 and IR8 require access for updating the timing synchronization

12 LMC report

 Day Start

Time (h)

Activity

9 Wed A 8 Ramp optimisation, 2e10 (tune, chrom, OFB on…) 9 Wed N 8 Ramp optimisation, 7e10, 1e11 (tune, chrom…)

10 Thur M 8 Controlled longitudinal emittance blow up in ramp- 1e1110 Thur A 8 Transverse feedback system commissioning10 Thur N 8 Squeeze commissioning, 1e1011 Fri M 8 Collimator setting up at 3.5 TeV, with separation on, 1e11/beam11 Fri A 8 Controlled longitudinal emittance- on ramp - 1e1111 Fri N 8 Transverse feedback system commissioning12 Sat M 8 Collimator setting up at 3.5 TeV, with separation on, 1e11/beam12 Sat A 8 Squeeze commissioning, with separated beams, 1e1012 Sat N 8 Transverse feedback system commissioning13 Sun M 8 Collimator setting up at 3.5 TeV, with separation on, 1e11/beam13 Sun A 8 Squeeze commissioning, with separated beams, 1e1013 Sun N 8 Collimator qualification at 3.5 TeV, with separation on, 1e11/beam14 Mon M 8 Injection system qualification14 Mon A 8 Collimator setting up at 3.5 TeV, squeezed, with separation off, 1e11/beam14 Mon N 8 Collimator qualification at 3.5 TeV, squeezed, with separation off, 1e11/beam15 Tues M 8 Transverse feedback system commissioning15 Tues A 8 Beam dumping system qualification15 Tues N 8 Collimator qualification at 3.5 TeV, squeezed, with separation off, 1e11/beam16 Wed M 8 Transverse feedback system commissioning16 Wed A 8 Controlled longitudinal emittance blow up in ramp- 1e1116 Wed N 8 Collimator qualification at 3.5 TeV, squeezed, with separation off, 1e11/beam17 Thur M 8 Transverse feedback system commissioning17 Thur A 8 Beam dumping system qualification17 Thur N 8 Ramp-squeeze operational qualification18 Fri M 8 Transverse feedback system commissioning18 Fri A 8 Test run for high intensity fills with collisions- NO STABLE BEAMS18 Fri N 8 Test run for high intensity fills with collisions- NO STABLE BEAMS19 Sat M 8 Test run for high intensity fills with collisions- NO STABLE BEAMS19 Sat A 8 Test run for high intensity fills with collisions- NO STABLE BEAMS19 Sat N 8 Test run for high intensity fills with collisions- NO STABLE BEAMS20 Sun M 8 Test run for high intensity fills with collisions- NO STABLE BEAMS20 Sun A 8 Test run for high intensity fills with collisions- NO STABLE BEAMS20 Sun N 8 Test run for high intensity fills with collisions- NO STABLE BEAMS

Program for the next 2 weeks


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