Proposed tandem mirror research program for FY87 presented to the MFAC subcommittee on mirror research, July 8-9, 1986 Page: 4 of 62
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EXECUTIVE SUMMARY
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1. We have re-examined the goal of -10 cm central-cell density with
end-plugging and reconfirmed its importance as a test of thermal barrier
end-plugging performance in either Tara or TMX-U. According to our
present understanding and performance modeling, achievement of this
density with available barrier pumping would require controlling radial
transport to rj > 10 ms and ion heating to Tj j± > MOO eV. Validation of
our models is important for increased confidence in the projected
performance of future devices.
2. We conclude that, when all factors are considered including the impact
on other programs interlinked with LL.NL in the present OFE budget, the
lowest cost approach to have a fair chance to meet this goal is to
extend Tara operation for the full FT87. Tara is a promising new
facility that is Just beginning to produce important results. Together
with key support from LLNL and Phaedrus, the incremental cost for its
full FY87 operation is $3.9 M (Case A).
3. Continuation of TMX-U operation in FY87, in addition to the full year of
Tara operation, would greatly Improve the chance of success. TMX-U has
an established experience base and diagnostics well-suited to study
plugging, and it has several new elements that are aimed at raising the
plugged density. With an increase to the fusion budget by Congress, we
recommend full year operation of TMX-U in addition to Tara in FY87, as
represented at a minimum by Case C. This would provide the greatest
chance for achieving the goal and provide a physics basis for continuing
the mirror as a fusion option.
A. Continuation of the mirror program into FX88 and beyond would be based
on an experimental program in TMX-U and Tara at a minimum budget level
of $25M/yr, with restart of MFTF-B requiring an increase in the national
fusion budget. The experimental program to be investigated by TMX-U and
Tara would include Improvement in the magnetic geometry (stability, beta
limits, and transport), continued plug studies (longer pulse length,
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Baldwin, D. E.; Correll, D. L.; Fowler, T. K.; Grubb, D. P.; Hershkowitz, N.; Porter, G. D. et al. Proposed tandem mirror research program for FY87 presented to the MFAC subcommittee on mirror research, July 8-9, 1986, report, July 23, 1986; [Livermore,] California. (https://digital.library.unt.edu/ark:/67531/metadc1093361/m1/4/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.