R&D Status and Plan on The Cryostat. N. Ohuchi, K. Tsuchiya, A. Terashima, H. Hisamatsu, M. Masuzawa, T. Okamura, H. Hayano. STF-Cryostat Design Construction Status of Cryostat R&D Studies of Cryostat Components Summary. Gaining the experience of the long cryostat for the S.C. cavity.
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N. Ohuchi, K. Tsuchiya, A. Terashima,
H. Hisamatsu, M. Masuzawa, T. Okamura, H. Hayano
Construction Status of Cryostat
R&D Studies of Cryostat Components
R&D of the high performance and the low cost ILC cryostat.
Cooling two types of the cavities of 35 MV/m and 45 MV/m down to 2 K in STF, and measuring the thermal characteristics.
Starting point of the STF cryostat design: TESLA TYPE III Cryomodule
R&D and study items for the STF cryostat
Understanding the TESLA design from the thermal and mechanical points of view.
Temperature profile and heat load of the components, and construction errors.
SUS-Ti joint between the helium vessel and cryogenic lines.
Measurement of the remnant field in the shield and the magnetic characteristics of the shield material.
Survey of the low cost quadrupole magnet system (conduction cooling)STF-Cryostat Design (1)
Target of the cryostat R&D in KEK
Strategy of the cryostat R&D
Design Overview of STF Cryostat
Two cryomodules are connected with bellow tubes.
Cross sections of STF Cryostat
80 K Thermal
5 K Thermal
Cooling scheme and heat loads
Cryogenic system : 20 W @ 2K
(Cold box : 600 W @ 4.4 K)
Calculated Heat Load for STF-Cryomodule (W)
Heat loads via signal wires are not included.
Calculated pressure distribution
Qc: 10/8 W or 30/8 W
m: evaporated helium gas
Gas Return Pipe
Thermal radiation shield
Vacuum vessel for 45 MV/m cavities
Sliding cavity support
SUS-Ti junction (35 MV/m cavity helium vessel)
Ti helium vessel
SUS-Ti junction by HIP
Heat Loss Measurement
Wire Position Monitor
16 sensors for cavity helium vessels
10 sensors for GRPs
The junctions have been manufactured by two methods (HIP, friction pressure welding). The helium leak test at 2 K will start next week.
The performance test will start in April.