Status Alcator C-Mod Engineering Systems. DoE Quarterly Review October 27, 2005

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1 Status Alcator C-Mod Engineering Systems DoE Quarterly Review October 27,

2 Outline Run campaign Up-to-Air Machine Status Lower Hybrid Cryopump Tungsten Tiles Schedule/Plans 2

3 FY2005 Run Campaign First plasma 2/01/05 End of campaign 8/31/ discharges All JOULE and PEA milestones completed on or ahead of schedule 3

4 FY2005 Run Campaign 1. Operate the C-Mod facility for 17 weeks (+/- 10%) of single shift research (4 days per week, 8 hours per day). [Level 1 JOULE target] [Sept 30, 2005] complete August 31, 2005 with 18.4 weeks of operation 2. Measure plasma behavior with high-z antenna guards and input power greater than 3.5 MW. [Level 1 JOULE target] [Sept 30, 2005] complete Sept 23, Investigate massive gas puff disruption mitigation of high pressure plasmas. [Sept 30, 2005] complete June 3, First operation of the Lower Hybrid microwave system into the C-Mod torus. [Sept 30, 2005] complete April 10, Measure upper divertor chamber pressures with the divertor baffle prototype and compare with previous results obtained without the baffles; assess implications for the planned divertor cryopump. [June 30, 2005] complete March 3, First operation of the long pulse diagnostic neutral beam. [July 31, 2005] complete May 20, Utilize all-digital real-time control system for closed-loop feedback control of tokamak discharges; compare performance to that from the analog-digital hybrid plasma control system. [April 30, 2005] complete February 2, Compare ~50 MHz D( 3 He) minority ICRF heating to ~80 MHz D(H) minority ICRF heating at B ~ 5 Tesla. [Sept 30, 2005] complete July 25, Implement a second multi-pulse laser, interleaving the two lasers to double the average measurement rate (to 60 Hz) for the core and edge Thomson scattering diagnostics. [Mar 31, 2005] complete February 8, Implement all-digital fire-wire based miniature CCD cameras for improved sensitivity and higher spatial resolution imaging of in-vessel components during tokamak plasma operation. [Sept 30, 2005] complete February 18, First tokamak plasma operation with prototype tungsten divertor tiles. [April 30, 2005] complete February 4, Measure dependence of the threshold for error-field induced locked modes as a function of toroidal field at fixed q and Greenwald fraction. The results should provide improved constraints on the size scaling for extrapolation to ITER. [July 31, 2005] complete March 1,

5 Current Up-To-Air Vent on 9/12/05 and pump-down on 10/03/05 Removal of J-Port Faraday screen and installation of new septa All outer divertor cover plates were removed and cleaned and dust was removed from under the plates Walls, tiles, mirrors, and windows were cleaned MSE calibrations and tests were performed Bolometer array alignment checked CXRS views confirmed CNPA line-of-sight improved A new periscope was installed at K-Port top Alignment and view of the LANL IR camera checked K-Port limiter melt zones removed FRC-ECE mirrors inspected and cleaned Both the D- and E-Port antennas were inspected and cleaned 5

6 Machine Status Machine is leak-tight and has been baked Vacuum conditions generally as good or better than just before the up-to-air (except for hydrogen background) ECDC discharge cleaning is ongoing Extensive maintenance of power supplies, ICRF systems, and alternator during up-to-air period Full cool-down to begin 10/27 Power tests begin on 10/28 6

7 Lower Hybrid System Extensive R&D performed to apply acceptable nickel plating to the couplers Geometry required careful design of anodes to properly plate waveguide interior --- particularly corners Extensive co-operation with vendor required to arrive at proper cleaning and plating process All four couplers have been successfully plated along with several test samples Extensive testing procedures developed Brazing of test samples proceeding this week Braze wetting test of couplers very successful All twelve klystrons have been operated simultaneously into dummy loads at a total power level of 1.7 MW 7

8 Lower Hybrid System Schedule Rough schedule showing approx times for each step Cool-down of brazing furnace is limiting factor 8

9 Cryopump Shim plates (14) Shelves (35) Support Posts (35) Components are arriving Shelves in-house Support posts inhouse Tiles have begun to arrive ( a few out 840) Vacuum test stand and associated instrumentation is in-house Shim plates are in production 9

10 Tungsten Tiles Test Tiles Bolt secures tiles and anchor to support plate Laminate of 4 mm thick tungsten plates Will form a toroidal belt of tiles on the lower outer divertor Test tile sent to Juelich, Germany for extensive high power testing program Installation during next up-to-air Thermocouple leads Copper test plate 10

11 Plans/Schedule Plasma operation begins 10/31/05 Operation of J-Port antenna w/o Faraday shield Up-to-Argon to install launcher as completion of couplers allows: approx 12/05 Lower hybrid and continued J-Port experiments Up-to-Air Install cryopump Install W tiles Numerous diagnostic changes Cryopump commissioning and lower hybrid Overall schedule and total number of run weeks will depend on actual FY06 funding Currently assuming 12 weeks of research operation 11

12 Schedule Option A D and E and J-Port antennas operate well 18 weeks of physics research possible 12

13 Schedule Option B Full ICRF Power is not available from D or J-Port antennas 18 weeks of physics research possible 13

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