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Title: Measurement of cryogenic target position and implosion core offsets on OMEGA

Abstract

Cryogenic target implosions currently performed on the University of Rochester’s OMEGA Laser System are of DT-filled polystyrene shells held at near the triple point temperature (~20 K) inside a cooled shroud that must be retracted from around the target just before the target is illuminated by OMEGA. As a consequence, impulses may be imparted to the target stalk, causing the target to depart from its ideal position centered at the aim point of the laser beams. The positions of cryogenic targets at the start of the laser pulse are determined in this work by comparing the positions of images of the cryogenic target implosion to that of a non-cryogenic target implosion that is accurately centered on the aim point of the beams. Images are from an array of up to five digitally recorded, x-ray pinhole cameras. Positions of the resultant implosion cores are determined along a single line of sight from x-ray images of these cores taken with an x-ray microscope operating in time-integrated mode. The offsets of the cryogenic-target cores relative to the non-cryogenic-target cores are found to have a magnitude and direction consistent with the core forming in the direction of the target offset at the start ofmore » the laser pulse. Here, the inferred offsets are therefore consistent to each other within errors. Neutron yields are seen to be affected by target offset although with considerable scatter.« less

Authors:
 [1];  [2]; ORCiD logo [3]
  1. Rochester Institute of Technology, Rochester, NY (United States)
  2. Univ. of Rochester, Rochester, NY (United States)
  3. Johns Hopkins Univ., Baltimore, MD (United States)
Publication Date:
Research Org.:
Univ. of Rochester, Rochester, NY (United States). Lab. for Laser Energetics
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1462954
Alternate Identifier(s):
OSTI ID: 1460603
Grant/Contract Number:  
NA0001944
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 25; Journal Issue: 7; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Grimble, W., Marshall, F. J., and Lambrides, E. Measurement of cryogenic target position and implosion core offsets on OMEGA. United States: N. p., 2018. Web. doi:10.1063/1.5033904.
Grimble, W., Marshall, F. J., & Lambrides, E. Measurement of cryogenic target position and implosion core offsets on OMEGA. United States. doi:10.1063/1.5033904.
Grimble, W., Marshall, F. J., and Lambrides, E. Tue . "Measurement of cryogenic target position and implosion core offsets on OMEGA". United States. doi:10.1063/1.5033904. https://www.osti.gov/servlets/purl/1462954.
@article{osti_1462954,
title = {Measurement of cryogenic target position and implosion core offsets on OMEGA},
author = {Grimble, W. and Marshall, F. J. and Lambrides, E.},
abstractNote = {Cryogenic target implosions currently performed on the University of Rochester’s OMEGA Laser System are of DT-filled polystyrene shells held at near the triple point temperature (~20 K) inside a cooled shroud that must be retracted from around the target just before the target is illuminated by OMEGA. As a consequence, impulses may be imparted to the target stalk, causing the target to depart from its ideal position centered at the aim point of the laser beams. The positions of cryogenic targets at the start of the laser pulse are determined in this work by comparing the positions of images of the cryogenic target implosion to that of a non-cryogenic target implosion that is accurately centered on the aim point of the beams. Images are from an array of up to five digitally recorded, x-ray pinhole cameras. Positions of the resultant implosion cores are determined along a single line of sight from x-ray images of these cores taken with an x-ray microscope operating in time-integrated mode. The offsets of the cryogenic-target cores relative to the non-cryogenic-target cores are found to have a magnitude and direction consistent with the core forming in the direction of the target offset at the start of the laser pulse. Here, the inferred offsets are therefore consistent to each other within errors. Neutron yields are seen to be affected by target offset although with considerable scatter.},
doi = {10.1063/1.5033904},
journal = {Physics of Plasmas},
number = 7,
volume = 25,
place = {United States},
year = {2018},
month = {7}
}

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