Ion beam measurement with a high-temperature superconductor SQUID and current comparator

Author

Hao, Ling ; Macfarlane, John C. ; Gallop, John C.

Author_Institution

Nat. Phys. Lab., Teddington, UK

Volume

50

Issue

2

fYear

2001

fDate

4/1/2001 12:00:00 AM

Firstpage

302

Lastpage

305

Abstract

A noninvasive and potentially absolute method is described for the real-time measurement of ion or electron beams in the range 1 μA-10 mA. The principle of the superconducting current comparator, which is well established in liquid-helium-temperature applications, is realized with high-temperature superconductor (HTS) components, and shown to be capable of sufficient sensitivity and accuracy for the proposed application. Particular attention is paid to the optimization of coupling between the current comparator and the HTS SQUID detector. The advantages to be gained by suitable patterning of the outer superconducting coating to achieve gradiometric detection are described. No serious problems were encountered during trial operation of the SQUID with an argon-ion magnetron plasma source

Keywords

SQUIDs; current comparators; electron beams; high-temperature superconductors; ion beams; process monitoring; sensitivity; 1 muA to 10 mA; accuracy; current comparator; electron beams; gradiometric detection; high-temperature superconductor SQUID; ion beam measurement; magnetron plasma source; outer superconducting coating; sensitivity; Current measurement; Detectors; Electron beams; High temperature superconductors; Ion beams; Magnetic field measurement; Particle beam measurements; Particle beams; SQUIDs; Superconducting materials;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/19.918127

Filename

918127