A Study of the Gettering Characteristics of Getter Pumps for Different Gases
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A Study of the Gettering Characteristics of Getter Pumps for Different Gases V. V. Anashina, A. A. Krasnova,b, and A. M. Semenova,c,* a
Budker Institute of Nuclear Physics (BINP), Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090 Russia b Novosibirsk State University, Novosibirsk, 630090 Russia c Novosibirsk State Technical University, Novosibirsk, 630073 Russia *e-mail: [email protected] Received March 23, 2020; revised April 28, 2020; accepted April 30, 2020
Abstract—The gettering characteristics of Ti–Zr–Al getter pumps with internal and external heaters have been measured for Н2 and CO. The results are compared to the measured similar characteristics of an NEX-Torr D 100-05 combined pump from SAES Getters and a titanium sublimation film at temperatures of 300 and 77 K. DOI: 10.1134/S0020441220050255
INTRODUCTION The Siberian Ring Photon Source (SKIF) Center for Collective Use, which is a synchrotron-radiation source of the 4+ generation, is being built in Novosibirsk [1]. The future source must satisfy the requirement of a small beam emittance (75 pm rad), which calls for an ultrahigh vacuum. Combined pumps, e.g., NEXTorr pumps from SAES Getters (Italy) [2], have been increasingly used recently to obtain high and ultrahigh vacuum. Such a pump consists of bulk getters and a serially connected magnetic-discharge pump in a common casing. The combination of different types of pumps can significantly reduce the overall dimensions and mass and significantly reduce the ultimate pressure of a vacuum pump. In spite of the success of several manufacturers in designing combined high-vacuum pumps, creation of a special-purpose small pump still remains interesting. It should be optimized for use in the SKIF vacuum system and designed on the basis of domestic getter materials. Prototypes of pumps with different geometric arrangements of getter tablets from AO Polema (Tula, Russia) were constructed as a first step towards this goal and their vacuum properties were studied. In this paper, we present the measured gettering characteristics of getter pumps for hydrogen and carbon monoxide. The getter pumps are based on sintered tablets of fine powder with a Ti–Zr–Al composition, which are activated either by an external or internal heater. The results are compared to similar characteristics of an NEXTorr D 100-05 combined pump by SAES Getters and of a titanium film at tem-
peratures of 300 and 77 K, which was produced by sublimation of titanium. THE DESCRIPTION OF THE TESTED PUMPS Titanium sublimators individually or in combination with ion-getter pumps have been used to obtain ultrahigh vacuum in accelerators. Enclosing an iongetter pump and a titanium sublimator in a common casing offers several advantages: a fast response of the sublimator to active gases (nitrogen, hydrogen, CO) and absorption of inert gases (argon and methane) by an ion-getter pump. However, in addition to the advantages, such pumps have a number of significant drawbacks: a small sorption capacity compared to bulk ge
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