VLT Budget Information: FY2001/2002
· Program Element: / Remote Handling.· Program Element Mission: (25 words or less) / Development of a FM coherent laser radar (FM CLR) for remote metrology, mapping, inspection, and motion detection of plasma facing surfaces and fusion reactor components.
· Element Five-Year Goals: (list up to five) / 1. Perform metrology and surface mapping in operating fusion experiments (e.g. NSTX) using the prototype FM CLR system – an ex-vessel unit, operating under atmospheric conditions.
2. Explore the use of Doppler corrected range measurements to study disruption induced motion of plasma facing components (PFCs).
3. Develop collaborations utilizing the FM CLR in major fusion experiments abroad (e.g. LHD, JT-60U).
4. Design, build, and test a FM CLR system for in-vessel metrology and surface mapping of PFCs in fusion experiments.
5. Design a burning plasma fusion reactor relevant FM CLR device.
· Relationship to FESAC Major MFE and IFE Goals: (25 words or less)
(Goals List: Attachment III) / Relates well with item # 4 of the FESAC MFE-specific goals. Would be valuable in assessing component stability and positioning accuracy of drivers and fusion chamber structures in IFE systems.
· Principal FY1999/2000 Achievements: (list up to five) / 1. High precision (< 0.1 mm precision in range values up to 22 m) metrology measurements were performed and high quality images of surfaces were produced using the FM CLR technique.
2. The prototype CLR unit was used for remote measurements to study the flaking phenomena of the TFTR inner limiter graphite tiles.
3. Gathered interest in collaboration from major fusion experiments abroad (LHD & JT-60U).
4. Demonstrated in the laboratory that Doppler corrected range measurements can be done with sub millimeter precision if the component vibration frequency is below about 10 Hz (this frequency limit could be improved).
· Identify Key Connections to Other Program Elements / Permits rapid verification of crucial in-vessel component positioning (such as the first wall tiles and the ICH antenna). Efficiently provides visual quality images of plasma facing surfaces without illumination and human entry into the vessel. A diagnostic tool for studying PFC motion during disruption.
FY2001
· President’s Budget: / $200K.
· Expected Deliverables and Key Milestones:
(list up to five) / 1. Conduct measurements of PFC structures in NSTX for quantitative comparison with baseline measurements made during the machine opening.
2. Conduct range measurements through a laser window (by correcting for the effect of the window).
3. Determine the amplitude and frequency of the motion of a selected PFC by conducting Doppler corrected range measurements.
4. Design and build an in-vessel compatible FM CLR system and use it for the measurement of divertor stripes pattern in LHD (subject to receiving the funds from Japan).
· Participating Institutions and Proposed Funding: /
ORNL ($200K) and PPPL
· Issues: / The usefulness of the technique can be significantly increased if an in-vessel vacuum compatible FM CLR unit, incorporating high-speed acousto-optic scanning technique, is built. This intermediate step will help in advancing the technique closer to what is needed for burning plasma applications. This would require about $350K of capital money. LHD has been asked to fund this activity and they are considering this option.· Incremental Request: / $75K.
· Additional Expected Deliverables: / Design and build a universal deployment mechanism for use in different fusion experiments.
FY2002
· Flat Budget:
(same as FY01 President’s Budget) / $200K
· Expected Deliverables and Key Milestones:
(list up to five) / 1. Characterize the spherical torus component motion and hysteresis during high power operation.
2. Investigate internal reconnection events in NSTX.
3. Carry out measurement of divertor stripes pattern in LHD (subject to CLR equipment procurement funding by Japan).
4. Conduct measurements in JT-60U (subject to funding by Japan).
· Incremental Request: / $100K
· Additional Expected Deliverables: / Relate PFC motion with J X B forces using TSC modeling and analysis.
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