LHCC LHCC , CERN 24th September 2008 , CERN 24th September 2008 LHC Status LHC Status Lyn Evans Lyn Evans
Jan 16, 2016
LHCCLHCC, CERN 24th September 2008, CERN 24th September 2008
LHC StatusLHC StatusLyn EvansLyn Evans
Lyn Evans – EDMS document no. 964651
Kick response compared with theoretical Kick response compared with theoretical opticsoptics
2
Lyn Evans – EDMS document no. 964651
Dispersion 2-3Dispersion 2-3
3
Lyn Evans – EDMS document no. 964651 4
Lyn Evans – EDMS document no. 964651
Beam on turns 1 and 2Beam on turns 1 and 2
5Courtesy R. Bailey
Lyn Evans – EDMS document no. 964651
Few 100 turnsFew 100 turns
6Courtesy R. Bailey
Lyn Evans – EDMS document no. 964651
Integer tunesInteger tunes
7Courtesy R. Bailey
Lyn Evans – EDMS document no. 964651
Tune measurementsTune measurements
8Courtesy R. Bailey
Lyn Evans – EDMS document no. 964651
Fast BCTFast BCT
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Lyn Evans – EDMS document no. 964651
Dump dilution sweepDump dilution sweep
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Lyn Evans – EDMS document no. 964651
H wire scanH wire scan
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Lyn Evans – EDMS document no. 964651
No RF, debunching in ~ 25*10 turns, i.e. No RF, debunching in ~ 25*10 turns, i.e. roughly 25 mSroughly 25 mS
12Courtesy E. Ciapala
Lyn Evans – EDMS document no. 964651
First attempt at capture, at exactly the First attempt at capture, at exactly the wrong injection phase…wrong injection phase…
13Courtesy E. Ciapala
Lyn Evans – EDMS document no. 964651
Capture with corrected injection phasingCapture with corrected injection phasing
14Courtesy E. Ciapala
Lyn Evans – EDMS document no. 964651
Capture with optimum injection phasing, Capture with optimum injection phasing, correct referencecorrect reference
15Courtesy E. Ciapala
Lyn Evans – EDMS document no. 964651
LHC longitudinal bunch profile Beam 2LHC longitudinal bunch profile Beam 2
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Lyn Evans – EDMS document no. 964651
Transformer failureTransformer failure
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• At 23:30 on Friday a 12 MVA transformer at Point 8 failed
• There is no spare unit but CMS has 2 similar transformers and a lot of over-capacity
• The cryogenics at point 8 (7-8 and 8-1) was lost
• The CMS transformer was installed on Saturday and Sunday