Diagnosing x-ray power and energy of tungsten wire array z-pinch with a flat spectral response x-ray diode

Fast z-pinch is a very efficient way of converting electromagnetic energy to radiation. With an 8-10 MA current on primary test stand facility, about 1 MJ electromagnetic energy is delivered to vacuum chamber, which heats z-pinch plasma to radiate soft x-ray. To develop a pulsed high power x-ray sou...

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Bibliographic Details
Published in:Review of scientific instruments 2015-11, Vol.86 (11), p.113508-113508
Main Authors: Wang, Kun-lun, Ren, Xiao-dong, Huang, Xian-bin, Zhang, Si-qun, Zhou, Shao-tong, Dan, Jia-kun, Li, Jing, Xu, Qiang, Ouyang, Kai, Cai, Hong-chun, Wei, Bing, Ji, Ce, Feng, Shu-ping, Wang, Meng, Xie, Wei-ping, Deng, Jian-jun
Format: Article
Language:English
Subjects:
BOLOMETERS
CALIBRATION
CATHODES
GOLD
HEAT
INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
KEV RANGE 01-10
NICKEL
Scientific apparatus & instruments
SOFT X RADIATION
Soft x rays
Spectra
SPECTRAL RESPONSE
Spectral sensitivity
SURFACE CONTAMINATION
TUNGSTEN
Vacuum chambers
Wire
X ray sources
X-RAY DIFFRACTION
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Summary:Fast z-pinch is a very efficient way of converting electromagnetic energy to radiation. With an 8-10 MA current on primary test stand facility, about 1 MJ electromagnetic energy is delivered to vacuum chamber, which heats z-pinch plasma to radiate soft x-ray. To develop a pulsed high power x-ray source, we studied the applicability of diagnosing x-ray power from tungsten wire array z-pinch with a flat spectral response x-ray diode (FSR-XRD). The detector was originally developed to diagnose radiation of a hohlraum in SG-III prototype laser facility. It utilized a gold cathode XRD and a specially configured compound gold filter to yield a nearly flat spectral response in photon energy range of 0.1-4 keV. In practice, it was critical to avoid surface contamination of gold cathode. It is illustrated that an exposure of an XRD to multiple shots caused a significant change of response. Thus, in diagnosing x-ray power and energy, we used each XRD in only one shot after calibration. In a shot serial, output of FSR-XRD was compared with output of a nickel bolometer. In these shots, the outputs agreed with each other within their uncertainties which were about 12% for FSR-XRD and about 15% for bolometer. Moreover, the ratios between the FSR-XRD and the bolometer among different shots were explored. In 8 shots, the standard deviation of the ratio was 6%. It is comparable to XRD response change of 7%.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.4934863