Fast Ion Loss Detectors for Wave-Particle Interaction Studies - - PowerPoint PPT Presentation

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Fast Ion Loss Detectors for Wave-Particle Interaction Studies Poloidal array of energy and pitch/energy resolving detectors will measure ICRH tail ion fluxes escaping the plasma. D.C. Pace 1 , R.S. Granetz 2 , S.J. Zweben 3 , D.S. Darrow 3 , C.

SLIDE 1

Fast Ion Loss Detectors for Wave-Particle Interaction Studies

Shot 1101216005 t = 0.86 s 1 MeV H+, v||/v = 0.1

D.C. Pace1, R.S. Granetz2, S.J. Zweben3, D.S. Darrow3,

C. Fiore2, S. Wukitch2,
A. Bader2, R. Parker2,

J.H. Irby2, and M. García-Muñoz4

1ORISE, 2MIT, 3PPPL, 4IPP

Poloidal array of energy and pitch/energy resolving detectors will measure ICRH tail ion fluxes escaping the plasma.

Presented at the 2011 Alcator C-Mod Ideas Forum Plasma Science and Fusion Center, MIT January 10 - 12, 2011

SLIDE 2

Pitch (v||/v) and energy are measured by

imaging scintillator plates

Narrow aperture causes scintillator strike position

to be a function of energy and pitch

Alfvén eigenmode (AE) analysis

– lost orbits calculated from measurements – simulation using measured AE properties identifies initially confined orbits that are placed on loss orbits due to the interaction*

Significant contributor to Alcator C-Mod research

– ICRH efficiency and model validation – perturbation losses: sawteeth, ELMs, AEs – companion to CNPA (cross-constraining) – high-Z wall performance

Phase Space Measurements of Lost Energetic Ions Elucidate Behavior in the Core

Contour represents a NOVA-K calculated TAE with n = 2 and peak δTe/<Te> ≈ 8 x 10-3, DIII-D. D.C. Pace, et al., PPCF, submitted (2010) *M.A. Van Zeeland, et al.,

Phys. Plasmas, submitted (2010)

Fast Ion Loss Detectors 2011 Alcator C-Mod Ideas Forum January 10-12, 2011

1.0 1.5 2.0 2.5 R (m)

0.0 0.5 1.0 1.5 z (m) 1.0 1.5 2.0 2.5 R ( ) 5 5 5 Lost Ion Confined Ion FILD

Shot 142111 t = 570 ms

SLIDE 3

Energy selection is determined

by gold film thickness

Construct/install five units

during 2011 vent

Pitch/energy resolving unit to

follow (test on S3)

Fast Ion Loss Detectors 2011 Alcator C-Mod Ideas Forum January 10-12, 2011

Scintillator Detectors are Sampled at 2 MHz, Capable of Resolving High Frequency MHD Activity

Film Scintillator Glass Probe Shaft Mirror Lens Fiber Optic Ion Impacts Film Size ~ 1 cm

Fast Ion Loss Detectors for Wave-Particle Interaction Studies - - PowerPoint PPT Presentation

Fast Ion Loss Detectors for Wave-Particle Interaction Studies

D.C. Pace1, R.S. Granetz2, S.J. Zweben3, D.S. Darrow3,

J.H. Irby2, and M. García-Muñoz4

Poloidal array of energy and pitch/energy resolving detectors will measure ICRH tail ion fluxes escaping the plasma.

Presented at the 2011 Alcator C-Mod Ideas Forum Plasma Science and Fusion Center, MIT January 10 - 12, 2011

imaging scintillator plates

to be a function of energy and pitch

– lost orbits calculated from measurements – simulation using measured AE properties identifies initially confined orbits that are placed on loss orbits due to the interaction*

– ICRH efficiency and model validation – perturbation losses: sawteeth, ELMs, AEs – companion to CNPA (cross-constraining) – high-Z wall performance

Phase Space Measurements of Lost Energetic Ions Elucidate Behavior in the Core

1.0 1.5 2.0 2.5 R (m)

0.0 0.5 1.0 1.5 z (m) 1.0 1.5 2.0 2.5 R ( ) 5 5 5 Lost Ion Confined Ion FILD

by gold film thickness

during 2011 vent

follow (test on S3)

Scintillator Detectors are Sampled at 2 MHz, Capable of Resolving High Frequency MHD Activity

Energy Resolving Unit (shield, aperture not shown)

ideal mounting position (facing B-port)

/home/pace/lossDetector/cmod- lossDetector.pdf