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LHC Wed 16 Sept 2015 Struggling with cryo o-night Tuesday - Wednesday 07:11 Injecting again 09:00 Dump on injection of train of 144 bunches, losses IP7.

Published byDaniel Haynes Modified over 9 years ago

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Presentation on theme: "LHC Wed 16 Sept 2015 Struggling with cryo o-night Tuesday - Wednesday 07:11 Injecting again 09:00 Dump on injection of train of 144 bunches, losses IP7."— Presentation transcript:

1 LHC Wed 16 Sept 2015 Struggling with cryo o-night Tuesday - Wednesday 07:11 Injecting again 09:00 Dump on injection of train of 144 bunches, losses IP7 10:07 Again –Transverse damper investigations and reboot of ADT crates  11:00 Injectors problems, cryo needs a break … 11:44 Beam Current Change Monitor dump upon injection (oscillations) 12:30 Injecting again 14:19 Stable beams, fill #4376, 1033 bunches, 144 bpi 14:29 Dump due to UFO 19R4 LHC Morning meeting – SR & JU117/09/2015 Last 24 hours

2 LHC Wed/Thur 16 Sept 2015 14:30 After dump lost cryo in 34, slow abort –Full pre-cycle needed –Access for LHCb + … 17:30 Injecting again 19:00 Problems PS during injection – dump as wait is long 21:30 Injecting again 22:30 During cryo wait very strong blow-up B2V: dump 23:19 Dump  lost CM in arc 34, followed by pre-cycle 01:10 Injecting again, fill in 3 steps – Chroma only down in V at waits 03:44 Stable beams fill #4381 1033 bunches, 144 bpi Cross fingers (04:53 UFO at 65 %) LHC Morning meeting – SR & JU217/09/2015

3 Transverse Damper Problem Daniel called, the injection gap cleaning FESA class has crashed, so it could be related to that – he's talking to Anthony. It seems the problem is related to a, yet unidentified, stability issues on ALLADTmDSPU processes. The quickfix that we can apply is a reboot from Diamon of the 4 ADT crates We will investigate on how to improve situation in the coming days, in between this methods should be applied as soon as you receive too many "RDA exceptions" on TRANSVERSE DAMPER CONTROL application. LHC Morning meeting – SR & JU317/09/2015 Anthony

4 Fill #4376, 1033 bunches, 144 bpi 10 min stable beams UFO 19R4 LHC Morning meeting – SR & JU417/09/2015

5 Fill 4379: Dump after cryo wait Strong blow-up B2H but especially V  restart, next time only chroma down vertically during wait: OK LHC Morning meeting – SR & JU517/09/2015

6 Fill #4381 Emittances at start of fill Some abort gap cleaning. Seems captured. LHC Morning meeting – SR & JU617/09/2015

7 The Plan At least two good fills with 1033 b, 144bpi Then possible step-up another 144 bunches –This would reach another rMPP milestone Under discussion, special fill for ATLAS for next week: –25ns_893b_881_828_830_72bpi17inj any scans etc. well defined Parasitic –RF studies as end of fill –TCL scans for Roman Pots –Monitoring of triplet movements and effect on orbit LHC Morning meeting – SR & JU715/09/2015

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