Design of a real-time two-color interferometer for MAST Upgrade

Journal Article · Sat Nov 15 00:00:00 EST 2014 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4894394· OSTI ID:22303706

Naylor, G.; Scannell, R.; Cunningham, G.; Martin, R.; Croft, D. ^[1]; Brunner, K. J. ^[2]

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1. CCFE, Culham Science Centre, Abingdon, Oxon OX14 3DB (United Kingdom)
2. Centre for Advanced Instrumentation, Department of Physics, Durham University, DH1 3LE (United Kingdom)

A single chord two-color CO{sub 2}/HeNe (10.6/0.633 μm) heterodyne laser interferometer has been designed to measure the line integral electron density along the mid-plane of the MAST Upgrade tokamak, with a typical error of 1 × 10{sup 18} m{sup −3} (∼2° phase error) at 4 MHz temporal resolution. To ensure this diagnostic system can be restored from any failures without stopping MAST Upgrade operations, it has been located outside of the machine area. The final design and initial testing of this system, including details of the optics, vibration isolation, and a novel phase detection scheme are discussed in this paper.

• OSTI ID: 22303706
• Journal Information: Review of Scientific Instruments, Vol. 85, Issue 11; Other Information: (c) 2014 Euratom; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
CARBON DIOXIDE
COLOR
DESIGN
DETECTION
ELECTRON DENSITY
ERRORS
HELIUM
INTERFEROMETERS
MAST TOKAMAK
MHZ RANGE 01-100
OPTICS
REAL TIME SYSTEMS
TESTING
TIME RESOLUTION