摘要:

The noise factor of the HAMAMATSU R 928 circular cage photomultiplier has been measured. It is demonstrated that the optimum mode of operation with respect to the noise is the one with constant interstage voltage distribution. Different effects contributing to the overall noise factor have been identified.

ISSN:0034-6748    

DOI:10.1063/1.1139543

出版商:AIP    

年代:1987

数据来源: AIP

摘要:

An easy method to prepare alkali ion emitters has been realized by using the ion‐exchange technique. The thermionic emission characteristics of zeolite A alkali ion sources have been studied. Experimental results indicate that ion transport process within zeolite plays an important role in the emission mechanism.

ISSN:0034-6748    

DOI:10.1063/1.1139544

出版商:AIP    

年代:1987

数据来源: AIP

摘要:

A compact, axially movable Faraday cup of low noise level was devised for measuring an intense electron beam of a duration time of 10 ns or less, with a replaceable aperture to limit incident electron beams in diameter.

ISSN:0034-6748    

DOI:10.1063/1.1139545

出版商:AIP    

年代:1987

数据来源: AIP

摘要:

A circuit is described which extends an interrupt input of a personal computer PC8001mkII to multiple interrupt inputs using a daisy‐chain approach, where prioritized interrupts up to 128 levels may be available by providing additional wait states and an interrupt look‐ahead circuit. The circuit presented in this note may be applied to other computers with some slight modifications.

ISSN:0034-6748    

DOI:10.1063/1.1139546

出版商:AIP    

年代:1987

数据来源: AIP

摘要:

A simple procedure is described for removing faulty photomultiplier tubes from Pb–glass detectors by means of heated chloroform.

ISSN:0034-6748    

DOI:10.1063/1.1139547

出版商:AIP    

年代:1987

数据来源: AIP

摘要:

Low‐cost talker and listener interfaces between the IEEE‐488 bus and a BCD instrument parallel data bus are described. The circuits do not employ any microprocessor at all. Their versatile handshake lines enable simple connection to numerous devices.

ISSN:0034-6748    

DOI:10.1063/1.1139548

出版商:AIP    

年代:1987

数据来源: AIP

摘要:

Alpha particle bombardment of a Si surface‐barrier detector in vacuum causes the release of several species of ions from the contaminant layer on the detector surface. The mass‐to‐charge ratios of the ions are determined by time‐of‐flight spectroscopy. A significant fraction of the ions are H+with a yield of 4×10−5H+per alpha particle and an emission energy of less than 70 eV. This ion source could be useful for testing slow &mgr;+collection optics and possibly for studying the diffusion of H atoms in liquid He.

ISSN:0034-6748    

DOI:10.1063/1.1139549

出版商:AIP    

年代:1987

数据来源: AIP

摘要:

A simple inexpensive electron beam/detector system is described. This system is capable of making vector maps of magnetic field errors over the minor cross section of toroidal plasma devices.

ISSN:0034-6748    

DOI:10.1063/1.1139664

出版商:AIP    

年代:1987

数据来源: AIP