Detail publikačního výsledku

Economical helium bath cryopump: design and testing

Musilová Věra, Dupák Jan, Hanzelka Pavel, Králík Tomáš, Urban Pavel

Originální název

Economical helium bath cryopump: design and testing

Anglický název

Economical helium bath cryopump: design and testing

Druh

Článek recenzovaný mimo WoS a Scopus

Originální abstrakt

A small UHV helium bath cryopump with low cryoliquid consumption has been designed, manufactured and tested. The cryopump is designed to keep UHV in electron optical devices without generation of disturbing electromagnetic fields or vibrations. The outer volume of its shell is 15 l, the filling volumes of liquid helium (LHe) and liquid nitrogen (LN2) are 3.0 l and 3.4 l, respectively. Operating times between cryoliquid fillings are 35 days for LHe and 6 days for LN2. A pump speed of 25 l/s was measured for the He gas. A lowest pressure of 1.5,10,7 Pa was achieved in a test chamber and the pumping tests indicated that an even lower pressure would be achieved in a well-degassed chamber. Good agreement between the calculated and measured values both of the pump speed and the cryoliquid evaporation has been found. The system of chevron-type baffles was designed and checked by Monte Carlo simulations of molecular flow and radiative heat transfer. The pump prototype was successfully used to evacuate an operating cryostat of a NMR spectrometer.

Anglický abstrakt

A small UHV helium bath cryopump with low cryoliquid consumption has been designed, manufactured and tested. The cryopump is designed to keep UHV in electron optical devices without generation of disturbing electromagnetic fields or vibrations. The outer volume of its shell is 15 l, the filling volumes of liquid helium (LHe) and liquid nitrogen (LN2) are 3.0 l and 3.4 l, respectively. Operating times between cryoliquid fillings are 35 days for LHe and 6 days for LN2. A pump speed of 25 l/s was measured for the He gas. A lowest pressure of 1.5,10,7 Pa was achieved in a test chamber and the pumping tests indicated that an even lower pressure would be achieved in a well-degassed chamber. Good agreement between the calculated and measured values both of the pump speed and the cryoliquid evaporation has been found. The system of chevron-type baffles was designed and checked by Monte Carlo simulations of molecular flow and radiative heat transfer. The pump prototype was successfully used to evacuate an operating cryostat of a NMR spectrometer.

Klíčová slova v angličtině

Cryopump; Molecular flow; Radiative heat transfer; Cryogenic optimisation; Monte Carlo particle tracing

Autoři

Musilová Věra, Dupák Jan, Hanzelka Pavel, Králík Tomáš, Urban Pavel

Rok RIV

2011

Vydáno

03.05.2004

ISSN

0042-207X

Periodikum

Vacuum

Svazek

2004

Číslo

74

Stát

Spojené království Velké Británie a Severního Irska

Strany od

77

Strany počet

7

URL

http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TW4-4BHV85H-8&_user=2654390&_handle=V-WA-A-W-AZ-MsSAYWW-UUW-U-AAWCUCYBCW-AAWWZBEACW-WCUBAEAWY-AZ-U&_fmt=full&_coverDate=05%2F03%2F2004&_rdoc=8&_orig=browse&_srch=%23toc%235552%232004%23999259998%23496357!&_cdi=5552&view=c&_acct=C000058444&_version=1&_urlVersion=0&_userid=2654390&md5=8c43f958caf972caf17a35aceb2e3423

BibTex

@article{BUT42434,
  author="Pavel {Urban}",
  title="Economical helium bath cryopump: design and testing",
  journal="Vacuum",
  year="2004",
  volume="2004",
  number="74",
  pages="7",
  issn="0042-207X",
  url="http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TW4-4BHV85H-8&_user=2654390&_handle=V-WA-A-W-AZ-MsSAYWW-UUW-U-AAWCUCYBCW-AAWWZBEACW-WCUBAEAWY-AZ-U&_fmt=full&_coverDate=05%2F03%2F2004&_rdoc=8&_orig=browse&_srch=%23toc%235552%232004%23999259998%23496357!&_cdi=5552&view=c&_acct=C000058444&_version=1&_urlVersion=0&_userid=2654390&md5=8c43f958caf972caf17a35aceb2e3423"
}