CRYOSORPTION OF HELIUM ON ARGON FROST IN TOKAMAK FUSION TEST REACTOR NEUTRAL BEAMLINES

被引：3

作者：

KAMPERSCHROER, JH ^{[1
]}

CROPPER, MB ^{[1
]}

DYLLA, HF ^{[1
]}

GARZOTTO, V ^{[1
]}

DUDEK, LE ^{[1
]}

GRISHAM, LR ^{[1
]}

MARTIN, GD ^{[1
]}

OCONNOR, TE ^{[1
]}

STEVENSON, TN ^{[1
]}

VONHALLE, A ^{[1
]}

WILLIAMS, MD ^{[1
]}

KIM, J ^{[1
]}

机构：

[1] GEN ATOM CO, SAN DIEGO, CA 92138 USA

来源：

JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A | 1990年 / 8卷 / 03期

关键词：

D O I：

10.1116/1.576590

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Helium pumping on argon frost has been investigated on Tokamak Fusion Test Reactor (TFTR) neutral beam injectors and shown to be viable for limited helium beam operation. Maximum pumping speeds are ~ 25 % less than those measured for pumping of deuterium. Helium pumping efficiency is.low, >20 argon atoms are required to pump each helium atom. Adsorption isotherms are exponential and exhibit a twofold increase in adsorption capacity as the cryopanel temperature is reduced from 4.3 K to 3, 7 K. Pumping speed was found to be independent of cryopanel temperature over the temperature range Studied. After pumping a total of 2000 Torr l of helium, the beamline base pressure rose to 2X10 −5Torr from an initial value of 10−8Torr. Accompanying this three order of magnitude increase in pressure was a modest 40% decrease in pumping speed. The introduction of 168 Torr l of deuterium prior to helium injection reduced the pumping speed by a factor of two with no decrease in adsorption capacity. © 1990, American Vacuum Society. All rights reserved.

引用

页码：3079 / 3083

页数：5

共 29 条

[1] A TSTA COMPOUND CRYOPUMP [J].

BATZER, TH ;

PATRICK, RE ;

CALL, WR .

JOURNAL OF VACUUM SCIENCE & TECHNOLOGY, 1981, 18 (03) :1125-1130

[2]

BATZER TH, 1979, 10TH P S FUS TECHN P, V2, P745

[3]

COFFIN DO, 1979, 8TH P S ENG PROBL FU, V1, P513

[4]

DAVEY G, 1971, ADV CRYOGENICS, P339

[5]

DAWBARN R, 1968, AEDCTR6890 ARN ENG D

[6]

FALTER HD, COMMUNICATION

[7]

FEIST JH, 1981, 9TH P S ENG PROBL FU, V1, P791

[8] HELIUM PUMPING AT 4.2-K BY MOLECULAR SIEVE-5A [J].

FISHER, PW ;

WATSON, JS .

JOURNAL OF VACUUM SCIENCE & TECHNOLOGY, 1979, 16 (01) :75-78

[9] CRYOSORPTION PUMPINT OF HELIUM AT 4.2 DEGREES K [J].

GRENIER, GE ;

STERN, SA .

JOURNAL OF VACUUM SCIENCE & TECHNOLOGY, 1966, 3 (06) :334-&

[10] MEASUREMENTS OF ADSORPTION-ISOTHERMS AND PUMPING SPEED OF HELIUM ON MOLECULAR-SIEVE IN 10-11-10-7 TORR RANGE AT 4.2 K [J].

HALAMA, HJ ;

AGGUS, JR .

JOURNAL OF VACUUM SCIENCE & TECHNOLOGY, 1974, 11 (01) :333-336

← 1 2 3 →