LCGT CRYOGENICS

2011.08.04 LCGT f2f meeting

ICRR Kashiwanoha

Contents of report

T. Suzuki Progress of construction and schedule

N. Kimura Status of the cryogenics design

Y. Sakakibara Incident thermal radiation through duct shield and cooling time of mirror

K. Yamamoto Cryogenic payload

Progress of construction• Low vib. 4K cryocooler unit (prototype)

– Manufactured one unit– Performance test in progress at KEK, detail will be presented by N.Kimur

a. • Low vib. 4K cryocooler unit (actual)

– Manufacture 7 units in 2011fy. – Cost may be 33% larger than the initial estimation.– Bidding on 9/5, opening on 9/20– Candidate companiess : 4 ?

• Cryostat /Mirror chamber– Machine 4 sets of components and partially assembling. – Cost may reduce 46% from the initial estimation by restriction of manufacturing per

iod. – Bidding on 9/5, opening on 9/21– Candidate companies : 3 ?

• Other expenses– Purchase instruments for measurement, trial manufacture, preparation of samples,

machining jigs, etc

LRIP

Cooling unit for suspension Design Manufacture

Install at Kashiwanoha