On cryosorption pumping of hydrogen with the ZDB–150 type cryopump cooled by a two‐stage closed‐cycle refrigerator

1982 ◽  
Vol 20 (4) ◽  
pp. 1000-1004 ◽  
Author(s):  
Bing‐kun Liu ◽  
Jia‐sheng Ren ◽  
Xiu‐hua Cui
Keyword(s):  
Closed Cycle ◽  
Two Stage ◽  
Cycle Refrigerator ◽  
Closed Cycle Refrigerator

Solid neon moderator for positron-trapping experiments

1996 ◽  
Vol 74 (7-8) ◽  
pp. 445-448 ◽  
Author(s):  
R. G. Greaves ◽  
C. M. Surko
Keyword(s):  
Single Crystal ◽  
Penning Trap ◽  
Closed Cycle ◽  
Trapping Rate ◽  
Two Stage ◽  
Positron Trapping ◽  
Tungsten Film ◽  
Cycle Refrigerator ◽  
Closed Cycle Refrigerator

A solid neon moderator using a two-stage, closed-cycle refrigerator was installed in an experiment to accumulate positrons in a Penning trap. This moderator replaced a single-crystal tungsten film moderator and yielded an approximate 20-fold improvement in the positron-trapping rate. Experience with the new moderator in a relatively poor vacuum environment of p ~ 1 × 10−7 Torr is discussed.

A highly efficient UHV cryo-adapter for a closed cycle refrigerator cold head

Vacuum ◽  
1990 ◽  
Vol 40 (1-2) ◽  
pp. 39-41 ◽  
Author(s):  
A Winkler ◽  
M Hausenblas ◽  
M Leisch ◽  
KD Rendulic
Keyword(s):  
Closed Cycle ◽  
Highly Efficient ◽  
Cycle Refrigerator ◽  
Closed Cycle Refrigerator

Mechanical design of a dual-cryostat instrument for a high-field pulsed magnet

2010 ◽  
Vol 1 (MEDSI-6) ◽  
Author(s):  
D. Capatina ◽  
Z. Islam ◽  
E. Trakhtenberg ◽  
H. Nojiri ◽  
Y. Narumi
Keyword(s):  
Liquid Nitrogen ◽  
High Field ◽  
Mechanical Design ◽  
Closed Cycle ◽  
Pulsed Magnet ◽  
Magnet Coil ◽  
Liquid Nitrogen Cooling ◽  
Photon Source ◽  
Cycle Refrigerator ◽  
Closed Cycle Refrigerator

The engineering of a dual-cryostat for a pulsed-magnet instrument at the Advanced Photon Source is presented. The dual-cryostat independently cools the magnet coil (using liquid-nitrogen) and the sample (using a closed-cycle refrigerator). Liquid-nitrogen cooling may allow a repetition rate of a few minutes for peak fields near 30 T. The system is unique in that the liquid-nitrogen cryostat incorporates a double-funnel vacuum tube passing through the solenoid's bore in order to preserve the entire angular range allowed by the magnet bore for scattering studies. Second, the use of a separate refrigerator for the sample allows precise positioning of samples in the bore while minimizing magnet vibrations propagating to the sample during pulsed-field generation.

Safety interlock and vent system to alleviate potentially dangerous ice blockage of top-loading cryostat sample sticks

2013 ◽  
Vol 46 (4) ◽  
pp. 1236-1239 ◽  
Author(s):  
S. Pangelis ◽  
S. R. Olsen ◽  
J. Scherschligt ◽  
J. B. Leão ◽  
S. A. Pullen ◽  
...  
Keyword(s):  
Sample Space ◽  
Closed Cycle ◽  
Safety Hazards ◽  
Relief Valve ◽  
Pressure Relief ◽  
Cycle System ◽  
Combined Solution ◽  
Vent Tube ◽  
Cycle Refrigerator ◽  
Closed Cycle Refrigerator

A combined solution is presented for minimizing the safety hazards associated with closed cycle cryostats described by Swainson & Cranswick [J. Appl. Cryst.(2010),43, 206–210]. The initial solution is to install a vent tube with one open end deep inside the sample space and a pressure relief valve at the top. This solution works for either a cryogen or a cryogen-free (closed cycle) system. The second approach, which can be combined with the first and is applicable to cryogen-free cryostats, involves electrically interlocking the closed cycle refrigerator compressor to the sample space, so that the system cannot be cooled in the presence of a leak path to air.

Operation of SFQ circuits cooled with 4 K closed-cycle refrigerator

2004 ◽  
Vol 412-414 ◽  
pp. 1580-1585
Author(s):  
H. Suzuki ◽  
H.S. Hirano ◽  
K. Tanabe
Keyword(s):  
Closed Cycle ◽  
Cycle Refrigerator ◽  
Closed Cycle Refrigerator

HTS scanning SQUID microscope cooled by a closed-cycle refrigerator

1999 ◽  
Vol 9 (2) ◽  
pp. 3704-3707 ◽  
Author(s):  
E.F. Fleet ◽  
S. Chatraphorn ◽  
F.C. Wellstood ◽  
S.M. Green ◽  
L.A. Knauss
Keyword(s):  
Closed Cycle ◽  
Scanning Squid ◽  
Cycle Refrigerator ◽  
Closed Cycle Refrigerator
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