Original title: Helium cryopump for electron optical devices design and preliminary cryogenic testing
Authors: Dupák, Jan ; Hanzelka, Pavel ; Musilová, Věra
Document type: Papers
Conference/Event: Cryogenics /6./, Praha (CZ), 2000-10-10 / 2000-10-13
Year: 2000
Language: eng
Abstract: A helium cryopump for electron optical devices was designed and preliminary cryogenic parameters of the first pump sample were tested. Low LHe consumption should enable economical operation of the pump without recycling the evaporated He. The pumping cryopanel is cooled by normal LHe down to 4.2 K. A LN2 bath is utilized for the LHe bath thermal shielding. Two additional heat radiation shields cooled by the vapours of the consumed cryoliquids are installed to decrease the LHe and LN2 losses. Three chevron screens placed between the input office and the cryopanel are used to protect the internal parts against direct heat radiation from the parts at ambient temperature. The chevron systems were replaced by low emissivity screens in the preliniary tests. Predicted low evaporation rates of LHe and LN2 were achieved.
Project no.: CEZ:AV0Z2065902 (CEP), GA101/00/0028 (CEP)
Funding provider: GA ČR
Host item entry: Proceedings of the 6th Cryogenics 2000 IIR International Conference - Refrigeration Science and Technology, ISSN 0151-1637
Note: Související webová stránka: mailto:dupak@isibrno.cz

Institution: Institute of Scientific Instruments AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: http://hdl.handle.net/11104/0100882

Permalink: http://www.nusl.cz/ntk/nusl-29479


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