LHC Progress Friday 30th October 2015

Coordination Week 44:Massimo Giovannozzi, Wolfgang Hofle,

Jorg Wenninger

LHC Morning meeting – WH & JW 2

Plan of the day

30/10/2015

skipped+ BI test

done

beam lost in rampbeing prepared, injectors checking

LHC Morning meeting – WH & JW 3

Thursday daytime

• Set-up of 2.51 TeV cycle for reference run• ramp with probes– 8:10 probes in– 12:20 collide & squeeze @2.51 TeV to 4 m– Q, Q’ orbit ok– Beta beating < 20%– Ready for nominals: to do’s

• Align TCTs, find collisions• MPS validation at FT and in collisions• Intensity ramp up and, Q, Q’ for high intensity

30/10/2015

LHC Morning meeting – WH & JW 4

Feedbacks (2.5 TeV cycle)

30/10/2015

Feedbacks behaved and Fidel model after ramp down to 450 GeV ok.

LHC Morning meeting – WH & JW 5

Flat Top RF Trim @2.51 TeV

30/10/2015

For dispersion measurement

LHC Morning meeting – WH & JW 6

Beam 1: Optics at 2.5 TeV

30/10/2015

LHC Morning meeting – WH & JW 7

Beam 2: Optics at 2.5 TeV

30/10/2015

LHC Morning meeting – WH & JW 8

Thursday p.m. • Check of Beam Intensity measurement

sensitivity to bunch length– 450 GeV, 12 bunches– Change bunch length by RF voltage trim at• Several trips of RF for beam 2• Beam 2 voltage changed in steps between 3 MV

and 9 MV

30/10/2015

LHC Morning meeting – WH & JW 9

Thursday evening night • Filling for Physics– 18:20 TDI B2 vacuum dumped during filling

(increased to 1e-5)• 2 pumps went off• Vacuum Piquet restarted pumps

– 20:30 Dumped again by vacuum of TDI B2• Exceeded interlock level with beam 2 with 2/3 of

total number of bunches• After discussion between equipment experts

thresholds for vacuum increased by 25% to 1e-5

– CBCM issues with multiple requests to SPS

30/10/2015

LHC Morning meeting – WH & JW 10

Thursday evening night

Filling for Physics• 1:30 TDI B2 vacuum not recovering and dumping

beam while filling– 2e-5 measured after last injection

• 4:20 Machine full and ramp started• Mismatch of RF functions (prepare for ramp)

• 5:40 beams dump @485 GeV• After long wait time at 450 GeV• Beam 2 losses (BLM IR7)

• 7:40 MKI 2.D faulty, piquet called, extended soft start

30/10/2015

LHC Morning meeting – WH & JW 11

TDI B2 vacuum

30/10/2015

Beams dumped several time at 450 GeV while filling over night

1:30 a.m.

1e-5

1e-6

1:00 a.m.

LHC Morning meeting – WH & JW 12

Fill 4554: Dumped by BLM IR7

30/10/2015

LHC Morning meeting – WH & JW 13

Plans and options • Test of 2.51 TeV cycle - settings ready probes done

• BCMS is ready take with 601 bunches, ramp + Physics if injection ok– 25ns_601b_589_438_459_96bpi9inj_bcms (250 ns gap between 48’s)– 25ns_601b_589_522_540_48bpi15inj_bcms (back-up)

• Physics with 2244 bunches

• Second test with asymmetric filling (1825b in B2, 12b in B1)• End of run last minute test requests:

– Injection with inverted tunes (0.31/0.28) to understand the source of electron cloud (dipoles/quads) – e-cloud team.

– 50 Hz from PCs – G. Arduini

30/10/2015

LHC Morning meeting – WH & JW 14

BCMS Filling scheme

30/10/2015

Injection kicker length to be adjusted

LHC Morning meeting – WH & JW

To do list

30/10/2015 15

8b4e Done short fill SB & 1593b to FT

BCMS Type test next

ADT full bandwidth GA request skip ?

ULO scan Towards the end

Reference heat load Before TS3

Check deconditioning at 450 GeV After TS3

Heat load with single beams to FT B1 done, B2 1824b with wire scans in B1 with 12 bunches

Bunch flattening tests in SB Done

First look at 2.51 TeV Done with probes, optics at 2.5 TeV

Doublet Pushed to 2016