Radiation temperature measurement of a long duration x-ray source for steady-state laboratory photoionized plasma experiments
Abstract
Long duration, i.e. tens of ns, broadband x-ray sources are important for steady-state laboratory photoionized plasma experiments relevant to astrophysics. In a series of experiments performed at the OMEGA EP laser facility, we have used the Gatling-Gun source to produce an x-ray drive that lasts for 30ns with a radiation temperature Tr =90eV. The Gatling-Gun source is comprised of three Cu hohlraums; each is filled with TPX foam and driven by a separate 10ns square pulsed laser beams with 4.4kJ of UV laser energy. The total source duration of 30ns is achieved by driving the three hohlraums sequentially in time. The radiation temperature was monitored with a VISAR diagnostic over a series of shots to check performance and consistency, and compare with previous miniDMX data. We present measurements of the radiation temperature obtained from VISAR data from two series of experiments performed at OMEGA EP, in conjunction with radiation-hydrodynamics simulations of the VISAR diagnostic package.
This work was sponsored in part by DOE NNSA NLUF Grant DE-NA0003533.- Publication:
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APS Division of Plasma Physics Meeting Abstracts
- Pub Date:
- 2019
- Bibcode:
- 2019APS..DPPC10081S