×


In a world increasingly facing new challenges at the forefront of plasma scientific research and technological innovation, CNR and ISTP pledge progress and achieve an impact in the integration of research into societal practices and policy

Conceptual design of JT-60SA edge Thomson scattering diagnostic

Pasqualotto R.; Tojo H.; Fassina A.; Giudicotti L.; Nardino V.; Oyama N.; Pelli S.; Raimondi V.; Ricciarini S.; Soare S.; Davis S.; Sozzi C.

JT-60SA will complement ITER in resolving key issues to finally decide an acceptable DEMO design. Diagnostics play a key role in this mission. The electron temperature and density profiles are measured by a core and an edge Thomson scattering (TS) diagnostics with high spatial resolution, needed to identify the pedestal parameters and small profile structures. The two systems use a common tangential Nd:YAG laser beam path in the plasma equatorial plane. The collection optics for the edge system (low field side) is hosted in a lower oblique port and that for the coresystem in a horizontal port. The optics fit in the port plug tube and image the scattering volumes into an array of fiber bundles. They both are exposed to a high neutron dose of1016n/cm2over 13years of operation. The optics are supported by a mechanical structure decoupled from the cryostat.A set of filter polychromators with avalanche photodiode (APD) detectors spectrally analyze the scattered radiation. The development of the TS systems is carried out by a joint Japan-EU team.The conceptual design of the edge TS system is presented here. Simulations of the TS signals show acceptable accuracy down to1×1019m-3electron density, sufficient to measure the edge gradient and even a small region outside the separatrix.

ID 418826
DOI 10.1088/1748-0221/15/01/C01011
PRODUCT TYPE Journal Article
LAST UPDATE 2022-02-07T10:09:48Z
EU PROJECT EUROfusion
TITLE Implementation of activities described in the Roadmap to Fusion during Horizon 2020 through a Joint programme of the members of the EUROfusion consortium
FOUNDING PROGRAM H2020
TOP