Uhv compatible chopper system

Technical Report · Thu Nov 01 00:00:00 EST 1979

DOI:https://doi.org/10.2172/5603810· OSTI ID:5603810

Voss, D E; Cohen, S A

A time-of-flight system utilizing a novel mechanical chopper has been developed to measure the energy spectrum of neutral deuterium atoms emitted from a tokamak plasma. The chopper system consists of a motor, a magnetically levitated shaft, and a chopper disc. The 20 g disc is rigidly attached to a 159 g shaft assembly and the set is supported against gravity in vacuum by permanent magnets and a stabilizing servo system. All components are uhv compatible to avoid contamination to the tokamak and to the detector. The 25.4 cm OD, .005 cm thick, 301 stainless steel chopper disc has 24 .025 cm wide slots photoetched at an 11.4 cm radius. An effective aperture time of .55 ..mu..s is achieved during typical steady state operation at 22,500 rpm with a vacuum pressure of 2 x 10/sup -8/ torr.

• Research Organization: Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
• DOE Contract Number: EY-76-C-02-3073
• OSTI ID: 5603810
• Report Number(s): PPPL-1611; TRN: 80-002280
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
DIAGNOSTIC TECHNIQUES
TIME-OF-FLIGHT METHOD
PLASMA DIAGNOSTICS
TOKAMAK DEVICES
ATOMS
DESIGN
DEUTERIUM
EMISSION
ENERGY SPECTRA
CLOSED PLASMA DEVICES
HYDROGEN ISOTOPES
ISOTOPES
LIGHT NUCLEI
NUCLEI
ODD-ODD NUCLEI
SPECTRA
STABLE ISOTOPES
THERMONUCLEAR DEVICES
700102* - Fusion Energy- Plasma Research- Diagnostics