New getter pump for ultrahigh vacuum systems and transportable enclosure

Abstract

We have developed a new type of nonevaporable getter (NEG) pump. It is based on the getter strip St707, produced by SAES getters S.p.A, fitted into a CF-flanged container. The pump is activated at 400°C for 1 h and its pumping behavior is studied for H2, CO, and N2. The pumping speed is about 500 liters/s for H2, 230 liters/ for CO, and 130 liters/s for N2, which is in good agreement with our theoretical pumping model. While its performance is similar to those of commercial NEG pumps, it is definitely more compact, inexpensive, and easy to use. When coupled with single-penning cell, our NEG pump can replace conventional ion pumps in the design of compact ultrahigh vacuum (UHV) systems. Its first application will be as an efficient and compact pumping device for portable UHV enclosure.

In situspectroscopy of intrinsicBi2Te3topological insulator thin films and impact of extrinsic defects

“…The transfer was done using a UHV suitcase equipped with a nonevaporable getter (NEG) pump [29] together with an ion pump. During the transfer process, the pressure remained lower than 2 × 10 −9 mbar.…”

“…After in-situ XPS measurements, samples were subsequently transferred to the low temperature STM chamber, which is not connected to the growth chamber. The transfer was done using a UHV suitcase equipped with a nonevaporable getter (NEG) pump 27 together with an ion pump. During the transfer process, the pressure remained lower than 2 × 10 −9 mbar.…”

Design study of distributed pumping system using multilayer NEG strips for particle accelerators

“…No dedicated equipment such as a coating system for long beam pipes is required for NEG strips. By stacking NEG strips, the pumping speed and the capacitance can be increased in principle [28,32,33,37,38,57]. Multilayer strips in a narrow space, however, will decrease the conductance between strips, and limit the effective pumping speed.…”

“…The careful optimization of the structure is required to obtain maximal performance of multilayer NEG strips. Presented in this paper is the design study of a distributed pumping system using multilayer NEG strips in a narrow pumping space, where a beam pipe with antechambers for advanced highluminosity machines such as the Super KEKB has been considered as an example [56][57][58][59][60][61]. A typical example of a beam pipe with antechambers is presented in Fig.…”

Characterization of alkali metal dispensers and non-evaporable getter pumps in ultrahigh vacuum systems for cold atomic sensors

“…The preparation of an ensemble of laser-cooled atoms in such a UHV chamber forms the starting point for cold atomic sensors 1 such as atomic clocks, atomic magnetometers, and inertial sensors that rely on atom interferometry. Compact, transportable ultra-high vacuum suitcases with nonevaporable getter (NEG) pumps have been developed for the transportation of hazardous or sensitive materials 2 and compact vacuum chambers that use a NEG pump in conjunction with a turbo pump 3 or ion pump 4 have been reported. However, there has been, to our knowledge, no demonstration of laser cooling in a compact, glass UHV chamber that operates with only NEG pumps intended for transportable cold atomic sensors.…”