A high spatio-temporal resolution optical pyrometer at the ORION laser facility

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Title: A high spatio-temporal resolution optical pyrometer at the ORION laser facility
Author(s): Floyd, E
Gumbrell, ET
Fyrth, J
Luis, JD
Skidmore, JW
Patankar, S
Giltrap, S
Smith, R
Item Type: Journal Article
Abstract: A streaked pyrometer has been designed to measure the temperature of ≈100 µm diameter heated targets in the warm dense matter region. The diagnostic has picosecond time resolution. Spatial resolution is limited by the streak camera to 4 µm in one dimension; the imaging system has superior resolution of 1 µm. High light collection efficiency means that the diagnostic can transmit a measurable quantity of thermal emission at temperatures as low as 1 eV to the detector. This is achieved through the use of an f/1.4 objective, and a minimum number of reflecting and refracting surfaces to relay the image over 8 m with no vignetting over a 0.4 mm field of view with 12.5× magnification. All the system optics are highly corrected, to allow imaging with minimal aberrations over a broad spectral range. The detector is a highly sensitive Axis Photonique streak camera with a P820PSU streak tube. For the first time, two of these cameras have been absolutely calibrated at 1 ns and 2 ns sweep speeds under full operational conditions and over 8 spectral bands between 425 nm and 650 nm using a high-stability picosecond white light source. Over this range the cameras had a response which varied between 47 ± 8 and 14 ± 4 photons/count. The calibration of the optical imaging system makes absolute temperature measurements possible. Color temperature measurements are also possible due to the wide spectral range over which the system is calibrated; two different spectral bands can be imaged onto different parts of the photocathode of the same streak camera.
Publication Date: 13-Sep-2016
Date of Acceptance: 30-Jul-2016
URI: http://hdl.handle.net/10044/1/55049
DOI: https://dx.doi.org/10.1063/1.4962036
ISSN: 0034-6748
Publisher: AIP Publishing
Journal / Book Title: Review of Scientific Instruments
Volume: 87
Issue: 11
Copyright Statement: © 2016 American Institute of Physics. Review of Scientific Instruments 87, 11E546 (2016);
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (E
Funder's Grant Number: EP/H500227/1
EP/R511547/1
Keywords: Science & Technology
Technology
Physical Sciences
Instruments & Instrumentation
Physics, Applied
Physics
Science & Technology
Technology
Physical Sciences
Instruments & Instrumentation
Physics, Applied
Physics
09 Engineering
02 Physical Sciences
03 Chemical Sciences
Applied Physics
Publication Status: Published
Article Number: 11E546
Appears in Collections:Physics
Plasma Physics
Faculty of Natural Sciences



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