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Plans for magnetic perturbation experiments on the COMPASS tokamak

Plans for magnetic perturbation experiments on the COMPASS tokamak. Pavel Cahyna, Radomír Pánek Institute of Plasma Physics AS CR v.v.i., Association EURATOM/IPP.CR, Prague, Czech Rep. The COMPASS tokamak – features. Smallest tokamak (R=0.56 m) with H-mode and ITER-relevant geometry

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Plans for magnetic perturbation experiments on the COMPASS tokamak

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  1. Plans for magnetic perturbation experiments on the COMPASS tokamak Pavel Cahyna, Radomír Pánek Institute of Plasma Physics AS CR v.v.i., Association EURATOM/IPP.CR, Prague, Czech Rep.

  2. The COMPASS tokamak – features • Smallest tokamak (R=0.56 m) with H-mode and ITER-relevant geometry • Experimental program focused on pedestal physics, L-H transition, edge plasma • Rich magnetic diagnostic • NBI both balanced and co-injection • “Saddle coils” to create magnetic perturbations

  3. COMPASS saddle coils • A set of coils segments, independently connectable, for producing magnetic perturbations • Toroidal symmetry n=2 • Off-midplane and on-midplane coils • Installation of new n=4 set of coils planned

  4. On-midplane Off-midplane Selected coil configurations • Both configurations can be combined into a 3-row configuration. • Maximum current in the coil segments is about 4 kA.

  5. COMPASS - near future plans • Performance • Ohmic H-mode 1/10 • NBI (2 x, balanced or co-injection) 8/10 • Perturbation coils • Present configuration (n=2) 3/10 • Upgrade (n=4) 7/10

  6. COMPASS diagnostics • Diagnostics existing or being installed • HR Thomson (2mm 60 Hz edge resolution) 6/10 • Edge reflectometry (μs resolution density measurement) 6/10 • Probes (fixed + 2 reciprocating) 1/10 • Li beam 12/09 • 2x fast visible camera 12/09 • Edge rotation measurement 3/10 • Atomic beam probe (edge current measurement) 6/10 • Divertor Langmuir probes 1 row - 36 probes present • Under consideration • Heavy ion beam probe (for plasma potential profile measurements) • IR cameras (divertor region) • CXRS on the heating beam for toroidal rotation measurements

  7. Possible contributions to the ITPA work plan • Comparison of midplane vs. off-midplane coils • Comparison of different toroidal mode numbers (requires n=4 coil set) • Quantification of the impact on pedestal height • Attempt to get an effect on type-I ELMs (if type-I ELM regime obtained – in NBI heated plasma) • Observe divertor power loads (divertor footprints – requires IR camera) • Impact on toroidal velocity (requires CXRS) • Verification of models • Joint experiments

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