Beam Commissioning Working Group meeting

Presentations

Triplet realignment	Massimo Giovannozzi
RF - restart	Philippe Baudrenghien
CMW status	Pierre Charrue
Optics measurement and correction at beta* = 3.5 m	Rogelio Tomas Garcia
Bunch trains and crossing angles at injection (rumours & facts)	Werner Herr
Global aperture measurements at 450 GeV with 170 microrad crossing angle	Massimo Giovannozzi
Injection and protection	Wolfgang Bartmann/Brennan Goddard
Summary of above at LMC 17/09/2010	Mike Lamont

Massimo: measurement of inner triplets tilts confirmed. Taking the limit of 0.2 mrad gives 7 quadrupoles to be realigned. To be done in winter shutdown with magnets empty.
Noted that MP review had recommended that remote adjustment system should be disable during beam operation.
PB: Iteration and fine adjustment of blow-up in ramp ongoing. Bunch shape close to Gaussian.
PB: Still need time to test flat botton mechanism of adiabatic voltage reduction for a few seconds at each injection.
CMW: CO taking problems seriously. Proper functioning of proxies clearly critical for operations and heavy loads generated by some clients are revealing issues.
Operations requested to report all bugs and issues through JIRA. Either right click in the logbook or go http://issues
Optics: 15% beating - very impressive. Generally feeling that iterating on this would not be necessary.
Nice results from "K modulation" - clear large discrepancy in point. Discussion ensued - waists, comparison with beating measurements, cross check with LHCb's data. Agreed that it should be remeasured.
Massimo: would be very good to remeasure aperture at top energy. Take 30, say, bunches up and selectively excite with transverse feedback. Clear machine protection issues.