Session 6Q - TFTR, JT-60, JET.
POSTER session, Wednesday afternoon, November 13
Exhibit Hall - Concourse Level, Adam's Mark
The Tokamak Fusion Test Reactor (TFTR), like all other tokamaks, is not immune to disruptions. However, even with a disruption rate of 5.8% for auxillary-heated discharges (1996 campaign), TFTR has a relatively low disruption rate. The high electric field present during the disruption gives rise to runaway electrons that can remain in the torus up to 0.2 s after the disruption. The presence of these fast electrons can be inferred with plastic scintillators sensitive to Bremsstrahlung photons with energies above \sim 10 keV. A high-speed digital video (visible wavelengths) camera is also used to observe precursor activity on the edge plasma together with post-disruption phenomena such as localized toroidal structures (``hula-hoops'') and flying debris. Results will be presented from the ongoing study of runaway production in TFTR and from the continuing effort to statistically characterize the disruptivity of TFTR plasmas.
This work is supported by the U.S. DoE under contracts No. W-7405-ENG-36 and DE-AC02-76-CHO-3073.