Plans for 201-MHz Cavities

Derun LiCenter for Beam Physics

Lawrence Berkeley National LaboratoryNovember 18, 2010

201-MHz Cavity Programs • Prototype cavity at the MTA– Surface damage on RF coupler and coupler port

region– Damage on the ceramic RF window – Data analysis of the existing RF test results–Window inspection tomorrow – RF test plans

• Development of test plan at this WS• Adding diagnostic at ceramic RF window • RF frequency variation as a function of average RF power (Be

window heating)

2MICE Video Meeting, D. Li, Lawrence Berkeley National Lab, November 18, 2010

201-MHz Cavity Programs

3MICE Video Meeting, D. Li, Lawrence Berkeley National Lab, November 18, 2010

SC CC magnet available by end of 2011

Ceramic RF window, copper sputtered on the window

Sparking on loop coupler

SC CC magnet 201-MHz Cavity Lab G Magnet

Status of MuCool CC Magnet

4MICE Video Meeting, D. Li, Lawrence Berkeley National Lab, November 18, 2010

• The Coil has 96 layers and 166 turns• SC coil winding completed 1 week ago• Al banding arrived China last week• Modification of the ICST test system is

under way (making progress, but with delays)

• Cryostat design by SINAP, the final design review is scheduled: Dec. 9 & 10 at SINAP, Shanghai

• Fabrication of cryostat components and cover plate welding soon

• Quench protection• CC assembly procedures • Cold mass test at HIT

201-MHz Cavity Programs • MICE cavities– Fabrication of ten 201-MHz cavities complete– Received eight Be windows at LBNL– Ten ceramic RF windows ordered– RF coupler design update is under way– RF tuner design and prototype

• Fabrication of six prototype tuners starts soon– Cavity post-processing at LBNL

• Surface cleaning, EP and cavity assembly – Cavity tuning

• Low power RF measurements of all MICE cavities

5MICE Video Meeting, D. Li, Lawrence Berkeley National Lab, November 18, 2010

MICE Cavity Fabrication

6MICE Video Meeting, D. Li, Lawrence Berkeley National Lab, November 18, 2010

201-MHz Cavity Programs • Design progress of a single cavity vacuum

vessel for RF tests at MTA or CERN

7MICE Video Meeting, D. Li, Lawrence Berkeley National Lab, November 18, 2010

201-MHz Cavity Programs

8MICE Video Meeting, D. Li, Lawrence Berkeley National Lab, November 18, 2010

•Single RF cavity vacuum vessel will potentially be used in a 3 T large bore magnet to perform RF breakdown test measurements in a magnetic field at CERN in support of the MTA at FNAL or in support of MICE

• Single cavity vacuum vessel superimposed between the magnet coils

82cm

79cm

201-MHz Cavity Programs • The single cavity vacuum vessel allows us to

explore many mechanical design and assembly issues before we have a MICE RFCC module

– Tuners– Couplers– Support– Cooling piping– Pumping– Assembly– Fixturing– …

9MICE Video Meeting, D. Li, Lawrence Berkeley National Lab, November 18, 2010