1. CMS vacuum chamber. Geometry for wakefield calculations
information from Bernhard Holzer, Daniel Pitzl, Benoit Salvant
Rainer Wanzenberg
DESY
Hamburg, June 13, 2012

2. “old” geometry See: LHC Project Note 418, May 27, 2009 Radius 29 mm
New Chamber
- 22 mm

3. New geometry New smaller beam pipe
Existing cone (orange) will be extended
Z = 1948 mm  mm

4. “old” geometry but shorter bunches
RMS Bunch length 7.5 cm, see LHC Project Note 418, May 27, 2009
Loss parameter:
Bunch length 4 cm:
preliminary results
~ 45 V / nC
(heating of components ?)
~ V / pC m
Kick parameter: