UKAEA-STEP-PR(24)19

ASSESSMENT OF THE IMPACT OF FUELLING PUFF LOCATIONS ON DIVERTOR IMPURITY COMPRESSION AND ENRICHMENT IN STEP

SOLPS-ITER simulations performed on STEP CDN geometry with Ar, varying D2 fuelling location

Fuelling location can be an actuator for impurity compression/enrichment Inner-midplane (IMP) fuelling enhanced Ar compression/enrichment by 1) driving main plasma outflow 2) increasing collision frequency and 3) lowering upstream temperature PFR+IMP fuelling may be optimal, given a direct impact on the upstream electron density with midplane fuelling. Further experimental/numerical studies will be carried out.

Collection:
Journals
Journal:
Nuclear Fusion
Publisher:
IOP (Institute of Physics)