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Formation of hot spots in the plasma of a Z-pinch produced from low-density deuterated polyethylene |
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| Authors: | A A Akunets S S Anan’ev Yu L Bakshaev P I Blinov V A Bryzgunov V V Vikhrev I V Volobuev S A Dan’ko A A Zelenin E D Kazakov V D Korolev B R Meshcherov S L Nedoseev V G Pimenov E A Smirnova G I Ustroev A S Chernenko V A Shchagin |
| Institution: | 1. Lebedev Physical Institute, Russian Academy of Sciences, Leninski? pr. 53, Moscow, 119991, Russia 2. Russian Research Centre Kurchatov Institute, pl. Kurchatova 1, Moscow, 123182, Russia 3. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninski? pr. 47, Moscow, 119991, Russia |
| Abstract: | Results are presented from experimental studies of the plasma formation dynamics in a Z-pinch produced from a cylindrical microporous agar-agar load. The experiments were performed on the S-300 facility at a current of 2 MA and current rise time of 100 ns. To enhance the energy concentration, a deuterated polyethylene neck with a mass density of 50–75 μg/cm3 and diameter of 1–2 mm was made in the central part of the load. The spatiotemporal characteristics of the Z-pinch were studied using an optical streak camera and fast frame photography in the optical and soft X-ray spectral ranges. X-ray emission was detected using semiconductor and vacuum diodes, and neutron emission was studied by means of the time-of-flight method. It is found that, in the course of continuous plasma production, hot spots with a diameter of 100 μm form in the pinch plasma. The hot spots emit short soft X-ray pulses with a duration of 2–4 ns, as well as neutron pulses with an average neutron energy of about 2.45 MeV. The maximum neutron yield was found to be 4.5 × 109 neutrons per shot. The scenario of hot spot formation is adequately described by two-dimensional MHD simulations. |
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