Summary report for subcontract No. 0412J0004-3Y, task order 23. Final report Page: 4 of 10
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Summary Report for Subcontract No. 0412J0004-3Y,
Task Order 23.
This task covers work performed by Carlton S. Young for various
projects in Group P-22, Los Alamos National Lab from Sept 1996 to Sept
Projects worked on and charged to contract:
1. Rebound, 80%
2. Reports on Nevada events Divider and Victoria, 10%
3. FORTRAN modifications to a Macintosh version of the ACCEPT
code and calculations on GaAs PCDs and Cherenkov detectors, 0%
4. Design of time and space-resolved burn measurements for the
National Ignition Facility (NIF) based on a gas Cherenkov gamma-ray
detector and proposals for more money to do the same, 10%
Rebound was the first test at the Nevada Test Site since Divider in
Oct 1992 employing fissionable material. It.was an equation of state (EOS)
study of plutonium with no planned yield from fission (the only yield to
be from the high explosive) to be fired in the old Lyner complex now
referred to as simply UlA. Most of the effort was devoted to a whole
suite of experiments exploring various aspects of shock propagation in
various configurations and phases of plutonium. Late in the event
sequence the Department of Energy requested the addition of an energy
release measurement to address possible adverse environmental and
press concerns. With many years experience in similar measurements P-
22 was called on to place an upper limit on the yield and I was called on
to help apply previous P-22 (actually P-14) experience.
With relatively little time to prepare, it was necessary to use the
existing accommodations within what remains of the weapons complex.
Two moderately sensitive detectors were salvaged by the few remaining
people in Bechtel Nevada (formerly EG&G) from existing parts leftover
from the old days. The design was modified only to provide greater
electromagnetic interference (EMI) shielding to better accommodate the
unknown environment of the underground emplacement about 1000 feet
below the surface. Leftover cables carried our signals to the surface and
leftover recording space in a trailer housed our digitizer recorders.
From the first, there was concern that a spurious event such as a
cosmic ray, easily detected by these very sensitive detectors, or detector
noise burst might be mistakenly assigned to the EOS event. Much of my
time in the field was spent determining the distribution of such noise
signals from the actual equipment that we were using. Digitizer noise was
quite low and in the end determined the upper limit of our yield
determination. The frequency of cosmic-rays was such that there was less
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Summary report for subcontract No. 0412J0004-3Y, task order 23. Final report, report, October 2, 1997; New Mexico. (digital.library.unt.edu/ark:/67531/metadc696183/m1/4/: accessed October 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.