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Recent Progress in ITER Diagnostics Development in Japan

Recent Progress in ITER Diagnostics Development in Japan. Y. Kusama for H. Ogawa, S. Kasai, T. Sugie 1) , T. Hatae, K. Sato, Y. Neyatani, Y. Kawamata, K. Kurihara, K. Ebisawa 2) Japan Atomic Energy Agency (JAEA) 1) ITER-IT, 2) AITEL Corp. 10th Meeting of the ITPA Topical Group

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Recent Progress in ITER Diagnostics Development in Japan

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  1. Recent Progress in ITER Diagnostics Development in Japan Y. Kusama for H. Ogawa, S. Kasai, T. Sugie1), T. Hatae, K. Sato, Y. Neyatani, Y. Kawamata, K. Kurihara, K. Ebisawa2) Japan Atomic Energy Agency (JAEA) 1)ITER-IT, 2)AITEL Corp. 10th Meeting of the ITPA Topical Group on Diagnostics Kurchatov Institute, Moscow, Russia, 10 – 14 April, 2006

  2. Outline • Recent Progress in Designs and R&Ds of ITER Diagnostics (Partially related to ITA Task ITA 55-10) • Impurity Flux Monitor (Divertor) • Thomson Scattering (Edge) • Neutronics Analysis for the Port Plug Design • Integrator for Magnetic Measurement • Planed Designs and R&Ds in 2006 (considered to be carried out under new ITA Task)

  3. Impurity Influx Monitor (Divertor) Mechanical Design - H. Ogawa, S. Kasai, T. Sugie (ITER-IT) Alignment Optics Primary Mirror Front End Optics in Upper Port to Plasma Field lens Correction lens Secondary Mirror Front End Optics in Equatorial Por Micro-lens Array Cassegrain Telescope Front End Optics in Divertor Cassette Collection Optics Front End Optics on Divertor Diagnostics Support Structure

  4. Design and R&D Plan in 2005 - 2006 JAEA Impurity Influx Monitor (Divertor) Design of Header Optics - Conceptual design of front end optics with the mirror folder for the integration into the ports. - Conceptual design of the cooling channel for the optical components. - Estimation of the temperature rise of the cooled optical components by a simple model calculation. - Studies of productivity and integration of optical components. R&D of the optical components - Prototype micro retro-reflector array (10 mm x 10 mm) made of nickel is produced for feasibility study and optical properties (reflectivity, scattering property of reflective light, etc.) will be studied. - Prototype micro-lens array (100 channels) made of fused silica is produced for feasibility study and optical properties ( the imaging property and the transmissivity, etc. ) will be studied.

  5. Mechanical Design of Front End Optics of Upper Port • As a result of the integration in the upper port, optical components were installed inside the pipe (ID: 300 mm) for the remote-handling of the port plug. • Three mirrors can be installed on the mirror mounting module with 300 mm diameter. It is also used for a neutron shielding and cooling the mirror. • The tilt angel of each mirror can be adjusted and be fixed before the installation on the port. Port Plug Pipe Front End Optics To Collection Optics Holder for Third Mirror Third Mirror First Mirror Holder for First Mirror Shutter Second Mirror Mirror Mounting Module Shutter Cross-sectional View of Mirror Holder to Plasma

  6. Mechanical Design of Shutter • Rotary disk shutter driven by the wire is designed. It is also used for the sensitivity calibration. • Bearings made of non-magnetized stainless steel (housing) and Silicon Nitride (ball) is a candidate for a fixed and flexible pivot in this area. • Further R&D such as double-sealed bellow type linear motion feedthrough and/or wire-winding mechanism is necessary for a realization. Shutter Plate (micro retro-reflector array is mounted) to Plasma to Collection optics Third Mirror First Mirror Pulleys Micro Retro-Reflector Array (for Calibration) Driving Wire Holder for Shutter to Collection Optics Shutter Second Mirror to Plasma Schematic Drawing of Front End Optics and Shutter Bottom View of Shutter

  7. Development of the edge Thomson scattering diagnostic system for ITER(progress report) T. Hatae for JA diagnostics group (Japan Atomic Energy Agency)

  8. Design and R&D Plan in 2005 - 2006 JAEA Thomson Scattering (Edge) • Development SLM laser oscillator based on the design carried out in 2004. • Design of high-average-power laser system (Flash-lamp-pumped high power amplifier) toward final performance (5J, 100Hz) • Optimization of collection optics, and engineering design of port plug

  9. Nd:YAG laser system for the edge Thomson system for ITER • A high output-energy (5J) and high repetition-rate (100 Hz) YAG-laser is required to the edge Thomson scattering system in ITER. • To develop the high power laser, stimulated-Brillouin-scattering-based phase conjugate mirrors are to be used to compensate the wavefront distortion induced in the high-power amplifying laser rods. • In the laser system, stable single-longitudinal-mode (SLM) is necessary to draw out its performance of the phase conjugate mirror. 1000W 100W 10W Average power = 1W

  10. A flash-lamp-pumped high power laser amplifier is under development • Amplification test will be carried out soon using new SLM laser oscillator. • Cr,Nd:YAG ceramics (not Nd:YAG synthetic crystal) is used as the laser medium. • Pumping energy: 100 J • Repetition rate: 100 Hz • Average input power: 10 kW • Pumping: 6 flash lamps

  11. Collection optics • Collection optics designed by US team during ITER-EDA has the vacuum boundary at the center of the port plug. • JA team is investigating the possibility to move the vacuum boundary to the end of the port plug for • easy maintenance, and • reducing radiation damage of the lens and fiber optics.

  12. 27 33 35 10 26 32 34 37 25 24 19 18 11 12 29 31 28 5 23 21 7 17 13 9 30 6 22 8 36 20 14 15 16 4 3 1000.00 MM Optimization of collection optics design is carrying out • Optical configuration is almost the same as the US design. • Vacuum boundary is arranged at the end of the port plug. • Considering the influence by the radiation, the lens is arranged more backward. Secondary mirror (toroidaly concave mirror) Slenderly cut lens To fiber coupling optics Third mirror(cylindrical concave mirror) Vacuum window (~100mm in diameter) Primary mirror (flat mirror) To fiber coupling optics 30.79° Intermediate image （possible to set a slit for shield） Secondary mirror (toroidaly concave mirror)

  13. Neutronics Analysis of Upper Port Y. Kusama, K. Ebisawa Objectives • Evaluation of the following engineering quantities; • Neutron Streaming through a Large Optical Labyrinth, Gaps between the Port Plug and the Vacuum Vessel Port, • Nuclear Heating of Diagnostic Components and the Port Plug, • Neutron and Gamma-ray fluxes and fluence on the Diagnostic Components, • Radioactivity of the Port Plug and External Dose Rate, • Relocation of front balk shield to the rear end.

  14. Progress in Neutronics Analysis • Nuclear Heating for cooling channel design • Total ~550 kW on BSM, about half of the specification (maximum input) • Maximum heat load on the side plates: 30 mW/cm3 • First Mirror: 16 mW/cm3, • At the end of Labyrinth: below 0.1 mW/cm3 • Flange Portion: negligible

  15. Optical Labyrinth of Edge Thomson Scattering: Original configuration designed by US HT in the EDA 1st Mirror 16 mW/cm3 6.6E+12 n/cm2/sec Fiber window 90x50 Fluence: 7E+14 n/cm2, 10 kGy 2.32ｍ Vacuum window 100x100 Fluence: 8E+13 n/cm2, 1kGy 1.07ｍ 0.89ｍ 2nd Lens 180x50 0.1mW/cm3 Fluence: 1.4E+17n/cm2, 1MGy 0.85ｍ 0.43ｍ Larger Aperture than original500x120 1.9E+14 n/cm2/sec 31度 1.50ｍ 2nd Mirror 0.7 mW/cm3 Fluence: 5E+17 n/cm2, 6 MGy

  16. Neutron fluence* and Gamma-ray absorbed dose on the candidate optical materials • Originally proposed • lens location: • 1.4E+17 n/cm2, 1 MGy, • marginal to use silica glass • Originally proposed • fiber location: • 7E+14n/cm2, 10 kGy, • some transmission • loss in fiber • *Plant life time accumulation • is considered • (= 0.3 MWa/m2 on the 1st wall) KUVI-S, HO<10E-4% X: 1E+17 n/cm2 J.Nucl.Mater.212215(1994),1059 SI Fiber Irrad. JMTR Task T246

  17. Neutron Streaming and bulk shielding Nucleat heating in TFC: Max. 2E-2mW/cm3 Flange External Dose Rate: 6 mSv/h Mirrors Labyrinth streamings Aperture Gap streamings Cooling Pipes Lens Relocate front bulk shield (1m) to the rear BSM Nuclear heating: 550 kW BSM support Cut out of the Lower Blanket

  18. External Dose Rate around the flange for maintenance scheme • Vacuum window: 6 mSv/hr 11.5 days after shutdown, satisfy the requirement <100 mSv/hr • 1 m apart from the flange: 4 mSv/hr, allow hands-on access • Influence on Magnet by relocation of the shield • Maximum Nuclear Heating in the TF Coil:100 times high flux than before, but still order of 1E-2 mW/cm3, satisfy the requirement <1 mW/cm3

  19. Integrator for Magnetic Measurement- Design, fabrication and test of new integrator- Y. Kawamata, K. Kurihara, I. Yonekawa Scope of Design Works and Results under ITA 55-10 (1) Investigate a method to avoid the saturation of the integrator circuit FET for circuit protection is damaged by excessive voltage inputs due to successive disruptions. The input circuit should be robust to them. (2) Design and fabricate a new integrator (3) Test newly fabricated integrator, statically and by using the thunder surge simulator (that simulates extremely high voltage input at disruption) to confirm performance Three types of input circuit (Attenuator type, Zener diode type, Power Mos-FET) have been fabricated and tested. The Zener diode type has been found to be acceptable and tested in JT-60U. (4) Discuss and propose methods to allow the integrator reject common-mode currents due to RIEFM The effect of RIEMF would be neglected.

  20. Integration gap occurs after excessive voltage inputs due to successive disruptions Disruptions Excessive voltage inputs Current flows over the limit of FET The oxide film of FET-Zener diode is damaged

  21. Circuit Type 1: An attenuator with feedback compensator to keep the attenuation ratio, and high-voltage resistant operational amplifier (250 V). < Linearity Test > 0.0008 % FS (10 V range) < 0.001 % FS (Op. amplifier spec.) Signal input circuit using attenuators Feedback compensator to keep the attenuation ratio seems to provide stability of measurements. < Conclusion > · Acceptable for the accurate magnetic measurement.

  22. Test of “Attenuator Type” in JT-60U discharges The “Attenuator Type” was applied to one of the magnetic probes of JT-60U and tested in disruptive discharges. “Gap Phenomenon” has been perfectly resolved so far and integration error caused by over range had been successfully corrected. Integration Results

  23. Design and R&D Plan in 2005 - 2006 JAEA Microfission Chamber • Design of installation, cabling, ---. • Optimization of installation position, especially position of MCF for low fusion power operation.

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