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Preliminary calculations for ITER EDA IDA have been performed using the 1/2D thermal equilibrium code HELIOS. It is found that:
the maximum ignition margin for ITER ID (29%) is 6% less than for ITER OD (35%) and 5% less than for ITER CDA (34%);
decreasing the ratio tau*He/tauE from the nominal value 10 to a value of 5 gives a 12% gain in the maximum ignition margin (increasing the ratio from 10 to 15 causes a 22% loss in the margin and ignited equilibria no longer exist for tau*He/tauE greater than or equal to 17.6;
lowering the fusion power from 1500 to 1000 MW slightly improves the maximum ignition margin (+5%) and allows operation below the Greenwald density limit;
a 10% reduction of the toroidal magnetic field with a correlative diminution of the plasma current for constant safety factor operation, causes a dramatic reduction (-18%) of the maximum ignition margin;
a fraction of neon of 0.68% would completely suppress the ignition margin and ignited equilibria, with the nominal fusion power and tau*He/tauE, no longer exist when the neon fraction exceeds 0.75%.

Additional information

Authors: JOHNER J, CEA, CEN Cadarache, Saint-Paul-lez-Durance (FR)
Bibliographic Reference: Report: EUR-CEA-FC-1561 EN (1995) 15pp.
Availability: Available from Association Euratom-CEA, CEN Cadarache, 13108 Saint-Paul-lez-Durance (FR)
Record Number: 199610250 / Last updated on: 1996-03-18
Original language: en
Available languages: en
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