Foil calorimeter measurements of soft-X-ray energy emission from KrF-laser-produced plasmas

Fedosejevs, R.; Tsui, Ying Y.; Popil, R.; Gupta, Pooja; Baker, Jeffrey A.; Offenberger, A. A.

doi:10.1088/0022-3727/20/10/008

Cited by 4 publications

(2 citation statements)

References 14 publications

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“…The above difficulties in measurements of absolute x-ray fluence from pulsed plasma sources can be avoided by using an x-ray bolometer. The latter is a radiation detector which works as a temperature transducer based on the change of the electrical resistance of a metallic microstructure due to rise in its temperature by x-ray absorption [10][11][12][13][14][15]. The change in the resistance of the detector is measured in a bridge circuit and correlated with the incident radiation fluence.…”

Section: Introductionmentioning

confidence: 99%

“…The change in the resistance of the detector is measured in a bridge circuit and correlated with the incident radiation fluence. Broadly there are two types of bolometers depending on whether the microstructure is directly exposed to the incident radiation [10,12,15], or otherwise [9,11,13,14]. While the directly exposed bolometers have a higher sensitivity, they suffer from the noise generated by resistance shunting due to secondary electron emission by the incident radiation and exposure of the microstructure to the plasma debris.…”

Section: Introductionmentioning

confidence: 99%

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Design, fabrication and characterization of an x-ray bolometer for pulsed plasma x-ray sources

Mahadevan¹,

Chakera²,

Vaidya³

et al. 2005

Meas. Sci. Technol.

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An x-ray bolometer for absolute measurement of broad-band soft x-ray fluence (10 eV < hν < 5 keV) from pulsed plasma sources is fabricated using an optical lithography technique. It is based on detecting the increase in resistance of a thin gold microstructure due to the temperature rise caused by absorption of x-ray energy in the absorber of the bolometer. The increase in the resistance is detected in a balanced bridge circuit and amplified by a low drift, high gain differential amplifier. The bolometer is calibrated for absolute sensitivity by comparing the signal of XUV pin diodes of known standard response detecting soft x-rays from a laser produced plasma. The response of the bolometer is measured to be ∼1.12 ± 0.05 mV mJ−1, with a heating time constant of 0.68 ms and a cooling time constant of 6 s. These values are found to be in good agreement with those derived using a simple analogy of charging of a capacitor by a pulsed signal. The details of bolometer design, fabrication and its characterization using x-rays (hν > 0.8 keV) from a copper plasma are presented.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design, fabrication and characterization of an x-ray bolometer for pulsed plasma x-ray sources

Mahadevan¹,

Chakera²,

Vaidya³

et al. 2005

Meas. Sci. Technol.

Self Cite

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Simulation of laser–plasma interactions with atomic and radiation effects

et al. 1988

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A one-dimensional Lagrangian code is used to model the interaction of laser light with plasma. The equation of state used is a realistic, piecewise analytic fit, which allows simulations starting from normal density and temperature conditions. The atomic physics required in the code (ionization, radiation rate, and opacities) is interpolated from tables generated using a non-LTE hydrogenic atom model. Radiation transport is treated approximately using a new, numerically efficient recursive algorithm. Results from numerical simulations are compared with recent X-ray measurements from Al, Ti, and Fe plasmas. The code is also used to investigate the X-ray conversion efficiency and the effect of radiation transport on the mass ablation rate and ablation pressure.

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A free-standing thin foil bolometer for measuring soft x-ray fluence

Ning

et al. 2016

Review of Scientific Instruments

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A free-standing thin foil bolometer for measuring soft x-ray fluence in z-pinch experiments is developed. For the first time, we present the determination of its sensitivity by different methods. The results showed great consistency for the different methods, which confirms the validity of the sensitivity and provides confidence for its application in z-pinch experiments. It should be highlighted that the sensitivity of a free-standing foil bolometer could be calibrated directly using Joule heating without any corrections that will be necessary for a foil bolometer with substrate because of heat loss. The difference of the waveforms between the free-standing foil bolometer and that with substrate is obvious. It reveals that the heat loss to the substrate should be considered for the latter in despite of the short x-ray pulse when the peak value is used to deduce the total deposited energy. The quantitative influence is analyzed through a detailed simulation.

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Foil calorimeter measurements of soft-X-ray energy emission from KrF-laser-produced plasmas

Cited by 4 publications

References 14 publications

Design, fabrication and characterization of an x-ray bolometer for pulsed plasma x-ray sources

Design, fabrication and characterization of an x-ray bolometer for pulsed plasma x-ray sources

Simulation of laser–plasma interactions with atomic and radiation effects

A free-standing thin foil bolometer for measuring soft x-ray fluence

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