An electrical insulator and feedthrough for use at cryogenic temperatures

✍ Scribed by J.A. Bamberger

• Publisher: Elsevier Science
• Year: 1974
• Tongue: English
• Weight: 196 KB
• Volume: 14
• Category: Article
• ISSN: 0011-2275
• DOI: 10.1016/0011-2275(74)90010-1

✦ Synopsis

Table 1 Pumping speeds of the cryopump for H 2 and Ar with the cold trap at 4.2 K and 2.2 K respectively (Pumping speeds of N 2 and dry air are equal to those of Ar within 10%) Pumping speed, I s "1 Gas 4,2 K 2.2 K H 2 4 000 5 200 Ar 1 000 1 000

gas molecules even for low values of the sticking probability. This effect has been verified experimentally a by measuring the pumping speed for various gases using different shapes for the trapping element, 6, which can be easily removed.