Obtaining extremely high vacuum using sintered fine copper powder as a cryosorbent

Autor:	Yutaka Matsui, Minsheng Xu
Rok vydání:	1995
Předmět:	Materials science Hydrogen Metallurgy Ultra-high vacuum Thermal desorption Refrigerator car chemistry.chemical_element Surfaces and Interfaces Cryopump Condensed Matter Physics Copper Surfaces Coatings and Films law.invention Pressure measurement chemistry law Third stage
Zdroj:	Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films. 13:132-135
ISSN:	1520-8559 0734-2101
Popis:	Fine copper powder (FCP), sintered to the cryopanels of cryopumps, was evaluated as a cryosorbent for H2. A Gifford–McMahon refrigerator cooled the tested cryopanel of a two‐stage cryopump. The third stage of a three‐stage cryopump that was tested was cooled by Joule–Thomson expansion of He. 30 g of FCP were sintered to the second stage panel (20 K) of the two‐stage bakeable cryopump, whereas 10 g of FCP were sintered to the third stage panel (4.3 K) of the three‐stage bakeable cryopump. Hydrogen pumping speed, capacity, and base pressure measurements are given as a function of temperature. Cryopanel preparation and system bakeout procedures, reliably leading to pressures
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::43ea2447d07b954ccb7b05480ec61651 https://doi.org/10.1116/1.579426 Zobrazit plný text záznamu