Pulse-dilation enhanced gated optical imager with 5 ps resolution (invited)

Journal Article · Fri Oct 15 04:00:00 EDT 2010 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.3479111· OSTI ID:22055870

Hilsabeck, T J; Kilkenny, J D ^[1]; Hares, J D; Dymoke-Bradshaw, A K. L. ^[2]; Bell, P M; Koch, J A; Celliers, P M; Bradley, D K; McCarville, T; Pivovaroff, M; Soufli, R; Bionta, R ^[3]

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1. General Atomics, P.O. Box 85608, San Diego, California 92186-5608 (United States)
2. Kentech Instruments Ltd., Wallingford, Oxfordshire OX10 (United Kingdom)
3. Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)

A 5 ps gated framing camera was demonstrated using the pulse-dilation of a drifting electron signal. The pulse-dilation is achieved by accelerating a photoelectron derived information pulse with a time varying potential [R. D. Prosser, J. Phys. E 9, 57 (1976)]. The temporal dependence of the accelerating potential causes a birth time dependent axial velocity dispersion that spreads the pulse as it transits a drift region. The expanded pulse is then imaged with a conventional gated microchannel plate based framing camera and the effective gating time of the combined instrument is reduced over that of the framing camera alone. In the drift region, electron image defocusing in the transverse or image plane is prevented with a large axial magnetic field. Details of the unique issues associated with rf excited photocathodes were investigated numerically and a prototype instrument based on this principle was recently constructed. Temporal resolution of the instrument was measured with a frequency tripled femtosecond laser operating at 266 nm. The system demonstrated 20x temporal magnification and the results are presented here. X-ray image formation strategies and photometric calculations for inertial confinement fusion implosion experiments are also examined.

• OSTI ID: 22055870
• Journal Information: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 10 Vol. 81; ISSN 0034-6748; ISSN RSINAK
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
CAMERAS
ELECTRONS
IMAGES
IMPLOSIONS
INERTIAL CONFINEMENT
LASERS
MAGNETIC FIELDS
MICROCHANNEL ELECTRON MULTIPLIERS
PHOTOCATHODES
PULSES
SIGNALS
TIME RESOLUTION
X RADIATION