Speaker
Juan Francisco Rivero-Rodriguez
Description
See the full Abstract at http://ocs.ciemat.es/EPS2018ABS/pdf/P1.1016.pdf
Development and installation of a scintillator based detector for fast-ion
losses in the MAST-U tokamak
J.F. Rivero-Rodriguez1,2, M. Garcia-Munoz2,3, L. Sanchis2,3, R. Martin4, K.G. McClements4,
R.J. Akers4, A. Snicker5, J. Ayllon-Guerola1,2, J. Buchanan4, P. Cano-Megias2,3, J.
Galdon-Quiroga2,3, D. Garcia-Vallejo1, J. Gonzalez-Martin1,2 and the MAST Upgrade and
MST1 Team*
1
Department of Mechanical Engineering and Manufacturing, University of Seville, Spain.
2
Centro Nacional de Aceleradores (CNA) (Universidad de Sevilla, CSIC, Junta de Andalucía).
3
Department of Atomic, Molecular and Nuclear Physics, University of Seville, Spain.
4
CCFE, Culham Science Centre, Abingdon, Oxon, OX13 3DB, UK.
5
Aalto University, Department of Applied Physics, P.O. Box 14199, FI-00076
A scintillator-based detector for fast-ion losses due to MHD instabilities and externally-applied
3D fields has been developed and installed in the MAST-U tokamak [1]. The detector has a
pitch-angle resolution of 2-3º and sufficient energy resolution to separate all three NBI
injection energy components. The detector head is mounted on a rotatory drive to change the
aperture orientation on a shot-to-shot basis, adapting the detector velocity-space coverage to the
equilibrium q95, an especially important feature for a spherical tokamak. A synthetic diagnostic
that includes detector head geometry, scintillator efficiency and optical transmission has been
constructed. Full orbit simulations have been carried out using the ASCOT [2] and LOCUST
[3] codes to estimate the predicted signals in MHD quiescent plasmas heated by on- and
off-axis NBI and with and without externally applied 3D fields. The impact that externally
applied 3D fields with different toroidal and poloidal spectra have on the NBI distribution has
been estimated and will be discussed in the presentation.
[1] J.F. Rivero-Rodriguez et al, 22nd Topical Conference on High Temperature Plasma Diagnostic (accepted).
[2] E. Hirvijoki et al, Comput. Phys. Commun. 185 (2014), 1310-1321.
[3] R. Akers et al., 39th EPS Conference & Int. Congress on Plasma Physics, P5.088 (2012)
* See author list of “H. Meyer et al 2017 Nucl. Fusion 57 102014”
