Matched calorimetric loads for high power millimeter-wave gyrotrons
- Bruschi, A.
- Muzzini, V.
- Spinicchia, N.
- Benocci, R.
- Carcano, G.
- Cirant, S.
- Gandini, F.
- Gittini, G.
- Granucci, G.
- Leuterer, F.
- Mellera, V.
- Monaco, F.
- Münich, M.
- Nardone, A.
- Schütz, H.
- Signorelli, E.
- Simonetto, A.
- Sozzi, C.
DOIAbstract
High power gyrotron testing at long pulses is a necessary step in the development of mm-wave systems for fusion research. For this purpose a compact calorimetric load is being developed, with low overall reflectivity (<5%) and aiming at 1 MW-CW capabilities, after the good performances of the loads (0.5 MW, 0.5 s per pulse) installed on the 140 GHz ECRH plant of the FTU Tokamak in Frascati. Tests at the same frequency but at higher power (0.7 MW, 1 s) and longer pulses (up to 2 s at 0.5 MW) on the ASDEX-Upgrade ECRH plant showed, after repeated exposures, damages on the absorbing layer, recognized as thermal effects due to the local enhancement of incident power: the effects visible near the entrance port are explained studying the superpos...
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