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NSTX-U Team Meeting

NSTX-U. Supported by. NSTX-U Team Meeting. 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 Seoul National U ASIPP

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NSTX-U Team Meeting

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  1. NSTX-U Supported by NSTX-U Team Meeting 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 Seoul National U ASIPP ENEA, Frascati CEA, Cadarache IPP, Jülich IPP, Garching ASCR, Czech Rep 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 February 11, 2014

  2. NSTX Team Meeting Agenda • Time: 1:30 ~ 3:00, February 11 (Tuesday), 2014 • Place: LSB 318, PPPL • • General Items (15 minutes) • • Program Item (25 minutes) • • Upgrade Project (25 minutes) • • Facility / Operations (25 minutes)

  3. Safely, Safely, Safely • • ES&H Issues (J. Levine) • • NSTX-U operational preparation activity (e.g., diagnostic installation) is commencing and we need to be extra cautious regarding safety! • • Winter weather has been quite severe! • - Proper protective clothing / equipment for outdoor work, keep warm • - Slippery road and walk-way conditions • - Proper exercise

  4. NSTX-U Research Team Has Been Scientifically Productive Very Active in Scientific Conferences, Publications, and Collaborations • Strong APS meeting (7 invited talks, 52 additional presentations) participation in the fall 2013. Three NSTX APS-DPP press releases available on the web. • Significant collaboration research contributions are being made in diverse science areas by the NSTX-U research team. A summary is available on the web: http://nstx.pppl.gov/DragNDrop/Collaboration/ • On-going active research collaboration particularly with DIII-D and EAST. Some activities resulted in IAEA synopses. • All of the FY 2013 milestones completed on schedule. • A good set of IAEA synopses (~30) being readied. • 61 refereed publications for CY 2013 with 4 PRLs. • NSTX-U FY 2014 Q1 Review held on Feb. 6, 2014. • NSTX FWP 2016 PPPL Research Council meeting held on Feb. 7, 2014.

  5. Engineering / Research Operations Preparation Ramping up for the NSTX-U Operations in Nov. 2014 • Upgrading the Plasma Control System (PCS) for NSTX-U. • Upgrading HHFW antenna feedthroughs for higher disruption forces. • Boundary Physics Operations • Improving the PFC geometry at the CHI gap to protect the vessel and coils. • Upgrading gas injection system including the massive gas injection disruption mitigation system. • Preparing lithium systems (LITERs, granule injector for ELM trigger, upward LITER). A lithium chemist hired for lithium safety and technology development. • Diagnostic Enhancements • MPTS laser and optics re-alignment and laser dump relocation. • Fabricating new port covers to support high-priority diagnostics. The last large port cover for Bay I port being fabricated. • Installing additional, redundant magnetic sensors. • Upgrading diagnostics: Bolometry (PPPL), ssNPAs, spectroscopy (collaborators) • Physics & Engineering Operations • Firing generators for 68 Transrex rectifiers replaced. Testing starting. • Repair of the Motor Generator radial arm weld cracks to complete in April. • Upgrading the poloidal field coil supplies to support up-down symmetric snowflake divertors on-going.

  6. F(14-1) Complete installation and testing of refurbished D-Site Rectifier Firing Generators. The D-site rectifiers (74 identical Transrex AC/DC Convertors of the NSTX Field Coil Power conversion System (FCPC) ) provide a pulsed power capability of 1800 MVA for 6 seconds every 300 seconds. The new 34 Firing Generator (FG) delivers firing pulses to 68 convertors with far greater resolution, precision, and repeatability for NSTX-U. Becomes particularly critical for the new 8-parallel, 130kA TF system configuration. Transrex AC/DC Convertors FY 2014 Q1 Accomplishments All 34 Firing Generators were installed in 68 rectifiers. Controls power testing is in progress. Individual rectifier power testing is starting.

  7. Repair of the Motor Generator (MG#1) • In 2004, Magnetic Particle Inspections identified cracking in the weld fillet of multiple joints between the radial arms of MG#1. Cracks were in primary load paths, taking that set out of service. MG#2 is in limited operations (run and monitor at reduced parameters) with cracks in “stiffener” welds intended to limit elastic deformation (not in primary load paths). • Over 250” of welds in 19 rotor spider joints will be ground out and replaced to restore MG#1 to its original design configuration. • A jacking system has been engineered to relieve all loads on the rotor assembly during the repair. • PPPL and GE engineering collaborated on the detailed repair procedure (D/NSTX-RP-MG-07). Status: Target completion date is Apr. 2014 A Statement of Work to perform the scope described in the repair procedure has been signed. Fixed-price proposals for the weld repairs have been received. A WAF capturing all project costs (PPPL and Sub-contractor) generated. A draft Project Management Plan has been developed. 

  8. New Compliant HHFW Antenna Feeds Will allow antenna feedthroughs to tolerate 2 MA disruptions HHFW antenna tests conducted in RFTF Installation on feed-thru Prototype compliant feeds tested successfully to 46 kV in the RF test-stand. Importance of proper back plate grounding discovered. Improving back plate ground being considered. Full compliant parts ordered. Inside of RF Test Stand with one antenna assembly.

  9. NSTX-U Lithium Capability During Initial Two Years Lithium Evaporators and Granular Injector New Upward Evaporating LITER Granule Reservoir Existing LITERS • Upward Evaporating LITER to increase Li coverage for increased plasma performance LLD LLD Struck Granule Horizontally Redirected at 70 m/s NSTX-U lithium granular injector for ELM pacing • High frequency ELM pacing with a relatively simple tool. • ELM pacing successfully demonstrated on EAST (D. Mansfield, IAEA 2012) t = 800 μs

  10. NSTX-U diagnostics to be installed during first 2 yearsHalf of NSTX-U Diagnostics Are Led by Collaborators • Edge Divertor Physics • Gas-puff Imaging (500kHz) • Langmuir probe array • Edge Rotation Diagnostics (Ti, V, Vpol) • 1-D CCD H cameras (divertor, midplane) • 2-D divertor fast visible camera • Metal foil divertor bolometer • AXUV-based Divertor Bolometer • IR cameras (30Hz) (3) • Fast IR camera (two color) • Tile temperature thermocouple array • Divertor fast eroding thermocouple • Dust detector • Edge Deposition Monitors • Scrape-off layer reflectometer • Edge neutral pressure gauges • Material Analysis and Particle Probe • Divertor VUV Spectrometer • Plasma Monitoring • FIReTIP interferometer • Fast visible cameras • Visible bremsstrahlung radiometer • Visible and UV survey spectrometers • VUV transmission grating spectrometer • Visible filterscopes (hydrogen & impurity lines) • Wall coupon analysis • MHD/Magnetics/Reconstruction • Magnetics for equilibrium reconstruction • Halo current detectors • High-n and high-frequency Mirnov arrays • Locked-mode detectors • RWM sensors • Profile Diagnostics • MPTS (42 ch, 60 Hz) • T-CHERS: Ti(R), V(r), nC(R), nLi(R), (51 ch) • P-CHERS: V(r) (71 ch) • MSE-CIF (18 ch) • MSE-LIF (20 ch) • ME-SXR (40 ch) • Midplane tangential bolometer array (16 ch) • Turbulence/Modes Diagnostics • Poloidal Microwave high-k scattering • Beam Emission Spectroscopy (48 ch) • Microwave Reflectometer, • Microwave Polarimeter • Ultra-soft x-ray arrays – multi-color • Energetic Particle Diagnostics • Fast Ion D profile measurement (perp + tang) • Solid-State neutral particle analyzer • Fast lost-ion probe (energy/pitch angle resolving) • Neutron measurements New capability, Enhanced capability

  11. D(14-1) Complete the Multi-Pulse Thomson Scattering (MPTS) diagnostic modifications MPTS Midplane Cross Section • Modification of the MPTS system is needed to accommodate the larger diameter NSTX-U Center Stack - Re-aim the laser beam, re-align the light collection optics, redesign the beam dump, and calibration probe to be ready for the first plasma. FY 14 Q1 Accomplishments: Design of the reconfigured MPTS system to meet these requirements was completed in FY2013 and three final design reviews were held to validate the design of the ex-vessel components. The new laser exit port and the new laser input port were installed on the vacuum vessel in FY2013. Fabrication and procurement of many of the needed ex-vessel components is underway and fabrication drawings for the remaining ex-vessel components are being prepared. The reconfigured MPTS diagnostic will be installed in FY2014 prior to NSTX-U first plasma and commissioned in early experimental operation following first plasma. • Ahmed Diallo recently received an Early Career Research Program award - will install a fast rep rate (10-15 kHz) burst mode (5 ms) third laser for studies of ELMs and other fast phenomena in FY15.

  12. MAPP being prepared for installation on NSTX-UContributed to R13-2 Milestone • Materials Analysis Particle Probe (MAPP) enables prompt analysis of components exposed to tokamak plasmas • Successfully demonstrated on Lithium Tokamak Experiment • Plasma performance correlated with PFC conditions from in situ measurements • Fitup in progress to check for interference with sides of slot in NSTX-U divertor To NSTX-U Vacuum Vessel R. Kaita, M. Lucia J.P. Allain, F. Bedoya

  13. Most Center Stack Diagnostics Mounted in Tiles Side of tile facing center stack casing • Most Mirnov coils, thermocouples, and Langmuir probes inserted into center stack tiles • Final set of sensors to be installed when outermost row of center stack divertor tiles becomes available • Installation of ex-vessel sensors begun • Flux loops being mounted on PF1B coils • Halo current Rogowski coils and shunt tiles to be mounted on center stack as part of tile installation procedure • Halo current Rogowski coils to be inserted behind tiles • Shunt tiles to be assembled on center stack Mirnov coil with copper electrostatic shield Thermocouple

  14. NSTX-U facility/diagnostics port assignment Port flanges designed and being procured

  15. New Port Covers Have Been Designed For Bays E, I, J, and LDetailed Design to Accommodate Enhanced NSTX-U Diagnostic Access Needs Bay I Supports XCS, TGS, IR & Visible Cameras, SSNPA, SGI, 1D CCD & EIES, Microwave Imaging, QMB, Bolometers Bay J Supports IR and Visible Cameras, UT-K and Divertor Spectrometers, Upward LITER, UCLA Reflectometer and Polarimeter, LBO, RF Probe. Bay E Supports UV Spectrometers (LoWEUS, XEUS, MonaLisa) and MIG Bay-L Cap (not shown) Supports MPTS exit window, High-k exit, plasma TV+GPI view, SSNPA, spectroscopy & CHERS view, GDC feedthroughs, magnetics feedthroughs.

  16. Draft NSTX-U Facility/Diagnostic Milestones Crucial to complete ECH/EBW and Cryo-pump Design in FY 2015

  17. A Range of Schedule Contingencies Under Consideration How to get ready for a productive research operation is a key A very preliminary run plan exercise for FY 2015 • CD-4 in October or November allows considerable flexibility in scheduling the research campaign up to 20 run weeks. • The runs assumes three weeks operation and one maintenance weeks. Some extended run weeks for the latter part of operation. • Strawman schedules involve more more time up front to bring systems online. • At moment, a 4 month period is allocated between CD-4 and the research plasma operation. • If the CD-4 date is delayed to December 2014 and beyond, the 20 run weeks in FY 2015 becomes challenging. • NSTX-U will be looking for opportunities to bring as much research run preparation tasks forward as possible. May 2015 Oct. 2014 Nov. 2014 Dec. 2014 Jan. 2015 Feb. 2015 Mar. 2015 Apr. 2015 May 2015 Jun. 2015 Jul. 2015 Aug 2015 Sep. 2015 5 Run Weeks Research Run Prep 15 Run Weeks Bakeout ISTP/Comm CD4

  18. Important message for those requirement in-vessel access Please be ready to take advantage of any access opportunities No in-vessel access planned after CD-4! • NSTX-U management will meet with those who need in-vessel access to develop a plan to accommodate your request. • Also those requiring work which is best done while machine is accessible, please let us know ASAP. We will try to accommodate you best we can. • Even those who do not need in-vessel access, and the installation scope is relatively modest, please let us know your plan now so that we can accommodate you! May 2015 Oct. 2014 Nov. 2014 Dec. 2014 Jan. 2015 Feb. 2015 Mar. 2015 Apr. 2015 May 2015 Jun. 2015 Jul. 2015 Aug 2015 Sep. 2015 5 Run Weeks Research Run Prep 15 Run Weeks Bakeout ISTP/Comm CD4

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