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Enhancing Power Handling Capabilities of CHI Gap Shields in NSTX Upgrade

The NSTX Upgrade aims to improve the power handling capability of the CHI gap shields due to issues related to plasma and heat degrading discharge performance and damaging diagnostics. The focus is on installing armor on the outboard side of the CHI gap to mitigate heat flux impacts, particularly for the new, narrower inner target configuration. Graphite is ruled out as a potential candidate due to high temperature bake-out requirements. The armor is expected to enhance tolerance to transient movements and improve heat flux handling, with candidate concepts already under consideration.

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Enhancing Power Handling Capabilities of CHI Gap Shields in NSTX Upgrade

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  1. NSTX Supported by CHI Gap Shields SPG, HK, RR Columbia U CompX General Atomics FIU INL Johns Hopkins U LANL LLNL Lodestar MIT Nova Photonics New York U ORNL PPPL Princeton U Purdue U SNL Think Tank, Inc. UC Davis UC Irvine UCLA UCSD U Colorado U Illinois U Maryland U Rochester U Washington U Wisconsin Culham Sci Ctr U St. Andrews York U Chubu U Fukui U Hiroshima U Hyogo U Kyoto U Kyushu U Kyushu Tokai U NIFS Niigata U U Tokyo JAEA Hebrew U Ioffe Inst RRC Kurchatov Inst TRINITI NFRI KAIST POSTECH ASIPP ENEA, Frascati CEA, Cadarache IPP, Jülich IPP, Garching ASCR, Czech Rep

  2. Desire to Improve the Power Handling Capability of the CHI Gap • Issue: Plasma & heat entering the CHI gap has been known to • degrade discharge performance due to heat flux on SS, and • damage diagnostics in the CHI gap, • Problem may be more severe in NSTX-Upgrade, where the horizontal inner target is more narrow. • Goal: Install armor on outboard side of CHI gap. • Graphite is not considered a plausible candidate due to high temperature bake-out requirement. • Provides 2 benefits • For cases with OSP on OBD bull-nose tiles, armor increases tolerance to transient inboard motion of the SP. • For cases with OSP in the inner horizontal target, armor improves power handling of the far(ther) SOL heat flux. • Not planning for this armor to be a primary, “steady-state” power handling component. • Have already identified candidate concepts, and are working with engineering to implement.

  3. Concept for Moly. Tile • asdfd

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