(Cd,Mn)Te detectors for characterization of X-ray emissions generated during laser-driven fusion experiments
✍ Scribed by A.S. Cross; J.P. Knauer; A. Mycielski; D. Kochanowska; M. Wiktowska-Baran; R. JakieŁa; J. DomagaŁa; Y. Cui; R.B. James; Roman Sobolewski
- Book ID
- 103860006
- Publisher
- Elsevier Science
- Year
- 2010
- Tongue
- English
- Weight
- 509 KB
- Volume
- 624
- Category
- Article
- ISSN
- 0168-9002
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✦ Synopsis
We present our measurements of (Cd,Mn)Te photoconductive detectors (PCDs), intending to characterize both the temporal and spectral dependence of X-ray emissions from laser-illuminated targets during inertial confinement fusion experiments. Our Cd 1 À x Mn x Te (x ¼ 0.05) single crystals, doped with V, were grown using a vertical Bridgman method and annealed in Cd vapor for the highest resistivity of $ 10 10 O cm. The 1-mm-long and 2.3-mm-long detectors were placed in the same housing as two 1-mm-long diamond PCDs. Each device was preceded by a Be X-ray filter with 37% X-ray transmission at the 1 keV cutoff energy. Energy of the incident OMEGA laser pulses varied from 2.3 to 28 kJ. Using targets of empty plastic shells, we observed two X-ray emission events separated by 1.24 ns: the first event was caused by heating of the shell that created a hot corona, while the second event was an X-ray emission from the fully compressed target. Experiments with targets with steel cores enabled us to analyze the time-resolved relaxation dynamics of photo-excited carriers in the (Cd,Mn)Te crystals. According to our calculations, the (Cd,Mn)Te material can very effectively absorb X-rays with energies of up to above 100 keV and the (Cd,Mn)Te PCDs are likely to complement the diamond detectors currently used in laser-confinement fusion experiments.