摘要:

A rotatable electrical feedthrough, maintaining continuous contact (as opposed to a wiper arm), is described. The connector takes up rotations of at least 270° by means of a compact clock‐spring arrangement.

ISSN:0034-6748    

DOI:10.1063/1.1138104

出版商:AIP    

年代:1985

数据来源: AIP

摘要:

An electrostatic quadrupole device capable of deflecting an ion beam at right angles is described. It is useful for overlapping an ion beam and a laser beam. Its aberrations are negligible in many applications where fine focusing is not required. The construction is simpler and less expensive than other similar devices.

ISSN:0034-6748    

DOI:10.1063/1.1138105

出版商:AIP    

年代:1985

数据来源: AIP

摘要:

We have observed an excess low‐frequency noise associated with the operation of a commercial rf‐biased SQUID (superconducting quantum interference device) sensor in freely convecting liquid helium. A simple technique for reducing convection and suppressing this low‐frequency noise is described.

ISSN:0034-6748    

DOI:10.1063/1.1138106

出版商:AIP    

年代:1985

数据来源: AIP

摘要:

A novel design for a low‐temperature valve is presented. Designed to be used on fill‐line capillaries and flow lines in low‐temperature apparatus, the valve has nearly zero dead volume as well as a very small total volume. It employs no metallic bellows as in standard valve designs. Instead, a Kapton membrane is epoxied into a cylindrical form to provide a flexible diaphragm, which is activated by pressurized helium. The valve is simple to construct, having only one machining operation, and uses materials readily available. It has been tested in liquid helium to be leaktight aboveT&lgr;with a 1‐bar pressure differential across the capillary containing the valve.

ISSN:0034-6748    

DOI:10.1063/1.1138107

出版商:AIP    

年代:1985

数据来源: AIP

摘要:

An inexpensive improved dc voltage supply for high‐vacuum straight through valves is described. The electronic circuit is composed of two parts: (1) the current generating section which withdraws the valve gate and maintains it in the open position and (2) the section which monitors whether the valve gate is open or closed.

ISSN:0034-6748    

DOI:10.1063/1.1138108

出版商:AIP    

年代:1985

数据来源: AIP