Articolo in rivista, 2023, ENG, 10.1016/j.fusengdes.2023.113535

Electron Cyclotron stray radiation detector studies for JT-60SA

Moro A.; Ayllon J.; Figini L.; Garavaglia S.; Kajiwara K.; Kobayashi T.; Piccinni C.; Simonetto A.; Sozzi C.; Urano H.; Yoshida M.

CNR ISTP - Institute for Plasma Science and Technology, Milano, Italy; University of Seville, Spain; National Institutes for Quantum and Radiological Science and Technology, QST, Naka, Ibaraki, Japan; Max-Planck-Institut fur Plasmaphysik, Garching bei Munchen, Germany.

Most of the present and future magnetic fusion devices rely on high power mm-waves injection for a variety of applications like plasma breakdown, heating and control. Since under specific operating conditions the mm-waves might not be fully absorbed, potentially damaging in-vessel components, the detection of the non-absorbed radiation is recommended. Among the options for stray radiation detection, we consider here the possibility to exploit the solid body bolometer and its use for JT-60SA. Analysis of the residual power fraction expected for low absorption plasma conditions is presented, considering the dependence on the Electron Cyclotron Resonance Heating (ECRH) system and plasma parameters of JT-60SA. The residual power hitting the wall is evaluated looking at direct illumination and cross-polarization effects. The possibility to integrate a sensor for EC stray radiation, adapting the solution of the detector developed for ITER, is the main outcome of this study. In the ITER bolometer the differential thermocouple principle is considered to single out the nuclear heating and the microwave loads. A key component of the detector is the metal body with a ceramic coating layer, optimized for 170 GHz and 60 GHz. Mm-waves characterization of different coating samples has been performed to identify the optimal solution for JT-60SA considering its multi-frequency ECRH system (138 GHz, 110 GHz, 82 GHz), and will be here presented. The experience from JT-60SA equipped with these sensors will be also useful for their future use in ITER.

Fusion engineering and design (Print) 191 , pp. 113535-1–113535-5

Keywords

Electron Cyclotron Resonance Heating, Stray radiation, Bolometer, Coating

CNR authors

Sozzi Carlo, Garavaglia Saul Francesco, Figini Lorenzo, Moro Alessandro Andrea, Simonetto Alessandro

CNR institutes

ISTP – Istituto per la Scienza e Tecnologia dei Plasmi

ID: 478302

Year: 2023

Type: Articolo in rivista

Creation: 2023-02-21 09:03:59.000

Last update: 2024-01-08 23:31:45.000

External IDs

CNR OAI-PMH: oai:it.cnr:prodotti:478302

DOI: 10.1016/j.fusengdes.2023.113535

Scopus: 2-s2.0-85148001807

ISI Web of Science (WOS): 000939760300001