Effects of spatial nonuniformity of superconducting-tunnel-junction ion detectors on mass Spectroscopy

被引：14

作者：

Ohkubo, M ^{[1
]}

Ukibe, M

Saito, N

Kushino, A

Ichimura, S

Friedrich, S

机构：

[1] Natl Inst Adv Ind Sci & Technol, Tsukuba, Ibaraki 3058568, Japan

[2] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA

来源：

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY | 2005年 / 15卷 / 02期

关键词：

mass spectroscopy; particle detectors; superconducting radiation detectors; superconductor-insulator-superconductor devices;

D O I：

10.1109/TASC.2005.850126

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Spatial uniformity of superconducting tunnel junction detectors with a size of 200 mu m is improved by increasing Al thickness of the Nb/Al proximized electrodes in an energy range of 5-10 keV. which is in the same order as an acceleration energy in time-of-flight mass spectroscopy (TOF-MS). It has been confirmed in the TOF experiments with Ta ions and Th clusters that the proximized junction detectors clearly separate different ionic states and multi-hit events in impact energy spectra, and moreover can reveal the difference in ion species or ion-surface collision dynamics. However, a better spatial uniformity is not always good for TOF-MS, possibly because a detector with the thicker Al layers has a lower superconducting energy gap, which results in an improper detector operation because of a temperature rise.due to heat radiation, or the states of the detector surfaces are different.

引用

页码：932 / 935

页数：4

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