(Color online) Photograph of deuterium gas puff installed at Z.
(a) Current and total x-ray power waveforms for 70-kV (Z1384) and 90-kV (Z1422) gas puff shots. The currents shown are the MITL currents. (b) The total power waveform for the 90-kV shot shows a two-stage rise. The same structure is apparent, although less obvious, for the harder x rays.
Neutron signatures as measured with the side-on neutron-time-of-flight. Z1384 was 70-kV, Z1422 was 90-kV. The first peak is the bremsstrahlung signature, the second is the neutrons. 2.45-MeV neutrons are measured.
Measured neutron output as a function of current. The circles show the average neutron output measured for Z; the diamond shows the previous Saturn result. The solid line shows the expected output for scaling.
Axially averaged, time-integrated spectrum from Z1422. Chlorine and argon -shell lines are observed due to the dopants in the deuterium. For Z1422, argon was on the inner shell, chlorine was on the outer shell.
Comparison of calculated and measured neutron output from pulsed power drivers. NR indicates where data was “not reported.”
Summary of load parameters for the deuterium gas-puff shots. The mass ratio inner:outer shell was 1:1. The pinch length was . Note that argon is 10 times more massive than deuterium; for Z1026 the argon was mixed in by pressure through a gas panel; for Z1384, Z1422, and Z1678, the gases were premixed at the level by number density for both the argon and Freon-12.
Comparison of 1D and 2D calculated neutron yields with measured yields. These are also compared with 3D outputs obtained using Gorgon.a
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