1. The MOSS Camera on H-1NF Clive Michael John Howard PRL,RSPhysSE,ANU Outline: MOSS (Modulated Optical Solid-State Spectrometer) Camera imaging Results and interpretation acknowledgements: B. Blackwell, A. Cheetham, R. Davies, J. Wach

2. Instrument measures: H Spectroscopic measurement of ION/ATOM: U TEMPERATURE U FLOW SPEED U SPECTRAL LINE INTENSITY H SPATIAL & TIME RESOLVED H VIEWING CHORD EMISSION WEIGHTED H spectroscopically, from DOPPLER BROADENING of transition radiation

3. MOSS Spectrometer is a Pockel’s cell Fixed delay, modulated Fourier transform spectrometer N 0 ~ 1000-5000, N 1 =1/4

4. Fringe contrast Fringe phase Measurement principle H Contrast => Temperature H Phase => Flow

5. H Achieves 2-D Imaging U Light collection simple H MOSS has capability for a wide field of view U Camera takes advantage of this H Compact and simple H MOSS uses large aperture optics, Grating spectrometer images through very thin slit Motivation for camera: to have multi- channel experiment

6. Camera Imaging principle

7. Field of View and etendue Contrast rolls of slowly. Contrast falls off fast! Usable field of view Phase pattern in detector plane

8. Field of View and etendue

9. Specifications Field of View  plasma :6 deg Number of Channels:16 Aperture:50mm Spectral Resolution :1/5000 (configurable from 1/20000 to 1/1000) Detector array:Multi-anode PMT f 1 is fixed. f 2 is chosen so that  camera =  plasma

11. Instrumentation

12. A Typical Temperature Profile H Ti Profile “Hollow” U implies ion heating in edge H Centre Ti rises slower than edge U Ion-Ion equilibration time: 2ms: comparable to rise time in centre U Ions are heated at edge and heat diffuses towards centre Aside: potential profile evolves on same timescale as Ion temperature

14. Abel inversion: Projection->Profile Camera FIR Interferometer Light intensity Fringe contrast (Temperature) Double inversion necessary H Transport studies: Assume flux surfaces have same T, I, n e H Combine MOSS Camera and FIR interferometer for studies of U Force balance U Ion transport studies (RF modulation,...) 

15. Conclusions H MOSS Camera has etendue orders of magnitude higher than traditional grating spectrometers H Field widening improves FOV by ~15 H Interesting and (Challenging) results => U Hollow temperature profile U Low rotation H Radial profiles -> Transport studies U RF modulation U Why are ions hot?