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 ◽  
...  

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.

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

1996 ◽  
Vol 74 (7-8) ◽  
pp. 445-448 ◽  
Author(s):  
R. G. Greaves ◽  
C. M. Surko

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.


2010 ◽  
Vol 1 (MEDSI-6) ◽  
Author(s):  
D. Capatina ◽  
Z. Islam ◽  
E. Trakhtenberg ◽  
H. Nojiri ◽  
Y. Narumi

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.


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

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

2001 ◽  
Vol 72 (8) ◽  
pp. 3281-3290 ◽  
Author(s):  
E. F. Fleet ◽  
S. Chatraphorn ◽  
F. C. Wellstood ◽  
L. A. Knauss ◽  
S. M. Green

2009 ◽  
Vol 35 (5) ◽  
pp. 1769-1773 ◽  
Author(s):  
Cheol-Jae Park ◽  
Hyun-Wook Ryu ◽  
Jong-Ha Moon ◽  
Jong-Sook Lee ◽  
Sun-Ju Song

Sign in / Sign up

Export Citation Format

Share Document