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ITER wide-angle viewing thermographic and visible system

ITER wide-angle viewing thermographic and visible system. Y.Corre, S.Droineau, A.Geraud, D.Guilhem , R.Jasper, E.Thomas, G.Madalluno, J.B.Migozzi, C.Walker. Duties : - IR Thermography of the main chamber - Visible Spectroscopy (D a , impurities: W, Be, C…) - Runaway Studies.

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ITER wide-angle viewing thermographic and visible system

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  1. ITER wide-angle viewing thermographic and visible system Y.Corre, S.Droineau, A.Geraud, D.Guilhem, R.Jasper, E.Thomas, G.Madalluno, J.B.Migozzi, C.Walker Duties: - IR Thermography of the main chamber - Visible Spectroscopy (Da, impurities: W, Be, C…) - Runaway Studies

  2. This presentation Our “know-how” for TORE-SUPRA Optical and Mechanical Pre-designs of IR and VIS Spatial resolution Pellet viewing Points to be Adressed and Developments Conclusions

  3. IR Thermography on Tore-Supra

  4. Feed-Back ControlParticipates to the security of PFC • Feed-Back on surface temperature of PFC • Antenna limiter protections (LHCD, ICRH) • Main Toroidal Pumped Limiter • Feed-Back compatible with others feedback • Width of current profile  n// • Vloop Poloidal Field Current • Heating power  IR thermography • Detection and Killing of ARCs at the LHCD mouth

  5. Global Assembly : Ports Configurations Study ITER preliminary design EQ #3 • STARTING POINT: • 4 Mounting places : EQ#01, EQ#03, EQ#09, EQ#12 • 2 known & approved (by ITER Team) port configurations : 1 + 3 • Preliminary design in Port 1 and Port 3 (C.Walker 2001)

  6. Diagnostics space occupation port plug EQ#01 Side view Top view

  7. Points of Interest Blind Spot Blind Spot

  8. REFERENCE Optical Line Distance between Front-End mirror and Cassegrain Relay is FIXED Fixed Fixed

  9. Generic Viewing Line Head mirrors + Deflecting flat mirrors in the dogleg + Cassegrain telescopes + Adaptative relay 2 Cassegrains telecopes Head mirrors Adaptative relay IR Visible Flat Mirrors

  10. Visible and IR Cassegrain telescopes embedded together Visible Image Visible Cassegrain IR Image IR Cassegrain

  11. Ray tracing of one hollow relay IR IR Visible Field groups

  12. General view of an assembled line(from the Cassegrain telescopes to the Bio-shield) Auto-Adaptative « sliding » relay Auto-Adaptative relay : - 5 mm in X,Y directions - 45 mm Z direction y z x

  13. Integration of Optical design into a Mechanical design

  14. Interference 3 Interference 1 and 2 Clashes Port-Plug#1

  15. An opening is necessary on the side for mirrors adjustments Bio-Shield Side view of the port-plug Opening to access the mirrors adjustments

  16. Infrared Cameras Expected F-number on IR sensor : • 1200 x 1000 pixels array with 15µm pitch (y=18mm x 15mm), then: FN = y / SQGE = 3.3 Maximum Resolution : • If one inject the “point size” 1pt =  . FN ( @ 55% ensquared energy) it comes (resolution = SQGE / ): • - For IR : Resolution @3µm = 1800pts Resolution @5µm = 1080pts • - For hollow Visible : Resolution @400nm = 3375pts Resolution @700nm = 1928pts

  17. Spatial resolution and wall covering EQ#01, 03, 09, 12 r (cm) top outer wall median in  inner wall  (radian)  z (m) median out top /2 divertor in divertor out outer wall r (m)  (radian) Sampling : poloidal section = 150 points reproduced every  1 ~ 60000 points main chamber view: (, ) Divertor Good Coverage of the first wall > 80% Outer wall completely covered (r  9 mm) Half inner wall is viewed with : good resolution. Small areas not seen : top part and divertor region

  18. Pellet viewing The respective locations of the pellet tracks and endoscopes from a top view. 2 LFS injections 3 HFS injections P6 track P6 track P18 track P12 track P12 track

  19. #01 LEFT #01 RIGHT P18 P6 #01 DIVERTOR Same views for #03, #09 and #12 Conclusion: Good for Pellet tracking P18 Port plug EQ#01

  20. DEVELOPMENTS I.Wide band Visible and Infrared antireflection coating for lenses Simplified architecture Reduction of Optical and Mechanical tolerances Large increase of the Visible performances (but not the IR) II.Test the auto-adaptative shifting relay (solution more reliable than active method) : Relative movement of the machine respectively to the bio-shield, Can accommodate the ITER on-axis translation (45mm) and the transverse directions (5mm) III.Optical generic line choice and optimisation Actually not fully designed  missing elements / information Broadband coating ? Number of beam-splitters ? IV.A mechanical design should be done when points I to III will be achieved V.Any type of cooled infrared camera (3µm – 5 µm) is sensitive to magnetic field

  21. Points to BE ADRESSED • New optical calculations • Use Up-to-Date DATA(diagnostics, pupils, AR coating, etc…) • Remove off-Axis (8° between Optical Axis and Blind Spot) • Mechanical update to take into account new optical design • Design a test-stand (how to qualify the IR endoscopes)

  22. CONCLUSIONS TORE-SUPRA  FEED-BACK and ARC-DETECTION with IR Thermography ITER  Architecture design of a GENERIC Optical and Mechanical Line CLASHES : Some identified  Have to be solved COVERAGE and SPATIAL RESOLUTION : have been estimated  Good Is-it adequate for : - IR-Thermography ?  YES - Visible Spectroscopy : - Da ?  YES - W ?  NO - Be ?  To be checked - Runaways (10-50 MeV with detection limit of 1 kA) ?  YES - Pellets Injections (#06, #12 and #18) ?  YES - Replacing IR-Divertor thermography ?  NO

  23. Thank you for your attention

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