. "Navr\u017Eena, postavena a otestov\u00E1na mal\u00E1 heliov\u00E1 kryov\u00FDv\u011Bva, vhodn\u00E1 pro vyu\u017Eit\u00ED jako dopln\u011Bk elektronov\u011B-optick\u00FDch p\u0159\u00EDstroj\u016F. \u00DAdaje z\u00E1v\u011Bre\u010Dn\u00E9 karty jsou adekv\u00E1tn\u00ED. V\u00FDznam zejm\u00E9na jako dopln\u011Bk elektrick\u00FDch optick\u00FDch p\u0159\u00EDstroj\u016F; v\u011Bdeck\u00E1 v\u00FDchova 1 doktoranda. V"@cs . "Heliov\u00E1 kryogenn\u00ED v\u00FDv\u011Bva pro elektronov\u011B optick\u00E9 p\u0159\u00EDstroje" . . "9"^^ . "Helium cryopump for electronoptical devices"@en . "http://www.isvav.cz/projectDetail.do?rowId=GA101/00/0028"^^ . . "9"^^ . . . "1"^^ . "The methods of the clean surfaces examination by using low energy electron beams, especially the methods combined with electron spectroscopy, require ultra high vacuum in the specimen, space and the elimination of the disturbing magnetic fields. The stramagnetic field of the ion pumps usually used may affect the electron beam particularly at a low energy. The design of an ultra high vacuum helium bath cryopump with the main features fitted to the demands of the electron optical instruments and the verification of the pump operating characteristics are the aims of this project. The pumping cryosurface will be cooled by normal liquid helium (LHe) to 4.2 K. The low LHe consumption will enable the economical operation without recycling of the evaporated He. An additional liquid nitrogen (LN2) bath will be utilized for the LHe bath shielding. New calculation methods and advanced cryogenic technology will enable the design and manufacturing of a small economical cryopump. The cryoliquid refill"@en . "GA101/00/0028" . . . . "Studium \u010Dist\u00FDch a definovan\u00FDch povrch\u016F pomoc\u00ED elektronov\u00FDch svazk\u016F s n\u00EDzkou energii, zvl\u00E1\u0161t\u011B pak v kombinaci s elektronovou spektroskopii vy\u017Eaduj\u00ED dosa\u017Een\u00ED ultravakua v prostoru prepar\u00E1tu i eliminaci ru\u0161iv\u00FDch magnetick\u00FDch pol\u00ED. Rozptylov\u00E9 pole obvykle pou\u017E\u00EDvan\u00FDch iontov\u00FDch v\u00FDv\u011Bv m\u016F\u017Ee v tomto p\u0159\u00EDpad\u011B negativn\u011B ovliv\u0148ovat elektronov\u00FD svazek. Hlavn\u00EDm c\u00EDlem projektuje n\u00E1vrh heliov\u00E9 l\u00E1z\u0148ov\u00E9 kryogenn\u00ED v\u00FDv\u011Bvy s parametry p\u0159izp\u016Fsoben\u00FDmi po\u017Eadavk\u016Fm p\u0159\u00EDstroj\u016F elektronov\u00E9 optiky v\u010Detn\u011B ov\u011B\u0159en\u00ED funk\u010Dn\u00EDch vlastnost\u00ED v\u00FDv\u011Bvy. K chlazen\u00ED \u010Derpac\u00EDho panelu v\u00FDv\u011Bvy na teplotu 4.2 K bude pou\u017Eito norm\u00E1ln\u00EDho kapaln\u00E9ho helia (LHe). Vzhledem k n\u00EDzk\u00E9 spot\u0159eb\u011B LHe nebude t\u0159eba k hospod\u00E1rn\u00E9mu provozu v\u00FDv\u011Bvy pou\u017E\u00EDvat uzav\u0159en\u00E9ho okruhu He. Ke st\u00EDn\u011Bn\u00ED l\u00E1zn\u011B LHe bude pou\u017Eitp\u0159\u00EDdavn\u00E1 l\u00E1ze\u0148 kapaln\u00E9ho dus\u00EDku (LN2). N\u00E1vrh a zhotoven\u00ED mal\u00E9 hospod\u00E1rn\u00E9 kryogenn\u00ED v\u00FDv\u011Bvy budou umo\u017En\u011Bny d\u00EDky nov\u00FDm metod\u00E1m v\u00FDpo\u010Dt\u016F a zdokonalen\u00FDm technologi\u00EDm v kryogenn\u00ED technice. P\u0159edpokl\u00E1dan\u00E9 intervaly dopl\u0148ov\u00E1n\u00ED kryokapalin jsou v\u00EDce jak 20 dn\u00ED pro" . . "0"^^ . . . . . "Neuvedeno."@en . "0"^^ . . "2008-05-19+02:00"^^ . . . .