Beam current sensor
Abstract
A current sensor for measuring the DC component of a beam of charged particles employs a superconducting pick-up loop probe, with twisted superconducting leads in combination with a Superconducting Quantum Interference Device (SQUID) detector. The pick-up probe is in the form of a single-turn loop, or a cylindrical toroid, through which the beam is directed and within which a first magnetic flux is excluded by the Meisner effect. The SQUID detector acts as a flux-to-voltage converter in providing a current to the pick-up loop so as to establish a second magnetic flux within the electrode which nulls out the first magnetic flux. A feedback voltage within the SQUID detector represents the beam current of the particles which transit the pick-up loop. Meisner effect currents prevent changes in the magnetic field within the toroidal pick-up loop and produce a current signal independent of the beam's cross-section and its position within the toroid, while the combination of superconducting elements provides current measurement sensitivites in the nano-ampere range.
- Inventors:
-
- Elmhurst, IL
- Elburn, IL
- Issue Date:
- Research Org.:
- Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
- OSTI Identifier:
- 866344
- Patent Number(s):
- 4687987
- Assignee:
- United States of America as represented by United States (Washington, DC)
- Patent Classifications (CPCs):
-
G - PHYSICS G01 - MEASURING G01R - MEASURING ELECTRIC VARIABLES
Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y10 - TECHNICAL SUBJECTS COVERED BY FORMER USPC Y10S - TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- DOE Contract Number:
- AC02-76CH03000
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- beam; current; sensor; measuring; dc; component; charged; particles; employs; superconducting; pick-up; loop; probe; twisted; leads; combination; quantum; interference; device; squid; detector; form; single-turn; cylindrical; toroid; directed; magnetic; flux; excluded; meisner; effect; flux-to-voltage; converter; providing; establish; electrode; nulls; feedback; voltage; represents; transit; currents; prevent; changes; field; toroidal; produce; signal; independent; cross-section; position; elements; provides; measurement; sensitivites; nano-ampere; range; superconducting element; feedback voltage; current measurement; conducting elements; superconducting elements; beam current; quantum interference; magnetic flux; charged particles; magnetic field; charged particle; current signal; current sensor; superconducting quantum; interference device; provides current; voltage converter; ampere range; dc component; /324/336/505/
Citation Formats
Kuchnir, Moyses, and Mills, Frederick E. Beam current sensor. United States: N. p., 1987.
Web.
Kuchnir, Moyses, & Mills, Frederick E. Beam current sensor. United States.
Kuchnir, Moyses, and Mills, Frederick E. Thu .
"Beam current sensor". United States. https://www.osti.gov/servlets/purl/866344.
@article{osti_866344,
title = {Beam current sensor},
author = {Kuchnir, Moyses and Mills, Frederick E},
abstractNote = {A current sensor for measuring the DC component of a beam of charged particles employs a superconducting pick-up loop probe, with twisted superconducting leads in combination with a Superconducting Quantum Interference Device (SQUID) detector. The pick-up probe is in the form of a single-turn loop, or a cylindrical toroid, through which the beam is directed and within which a first magnetic flux is excluded by the Meisner effect. The SQUID detector acts as a flux-to-voltage converter in providing a current to the pick-up loop so as to establish a second magnetic flux within the electrode which nulls out the first magnetic flux. A feedback voltage within the SQUID detector represents the beam current of the particles which transit the pick-up loop. Meisner effect currents prevent changes in the magnetic field within the toroidal pick-up loop and produce a current signal independent of the beam's cross-section and its position within the toroid, while the combination of superconducting elements provides current measurement sensitivites in the nano-ampere range.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1987},
month = {1}
}