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