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Summary of Presentations on Plasma Start-up and Progress on Small ST devices from STW2011

NSTX. Supported by. Summary of Presentations on Plasma Start-up and Progress on Small ST devices from STW2011. College W&M Colorado Sch Mines Columbia U Comp-X General Atomics INL Johns Hopkins U LANL LLNL Lodestar MIT Nova Photonics New York U Old Dominion U ORNL PPPL PSI

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Summary of Presentations on Plasma Start-up and Progress on Small ST devices from STW2011

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  1. NSTX Supported by Summary of Presentations on Plasma Start-up and Progress on Small ST devices from STW2011 College W&M Colorado Sch Mines Columbia U Comp-X General Atomics INL Johns Hopkins U LANL LLNL Lodestar MIT Nova Photonics New York U Old Dominion U ORNL PPPL PSI Princeton U Purdue U SNL Think Tank, Inc. UC Davis UC Irvine UCLA UCSD U Colorado 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 KBSI KAIST POSTECH ASIPP ENEA, Frascati CEA, Cadarache IPP, Jülich IPP, Garching ASCR, Czech Rep U Quebec R. Raman University of Washington, Seattle, WA • This work is supported by US DOE contract numbers FG03-96ER5436, DE-FG02-99ER54519 and DE-AC02-09CH11466 The Joint Meeting of5th IAEA Technical Meeting on Spherical Tori16th International Workshop on Spherical Torus (ISTW2011)2011 US-Japan Workshop on ST PlasmaSeptember 27-30, 2011 National Institute for Fusion Science, Toki, Japan

  2. Plasma Start-up, Small STs, Spheromaks • NSTX (CHI) PPPL – Raman • PEGASUS (Gun start-up) Univ. of Wisconsin – Fonck • QUEST (RF start-up) Kyushu University – Hanada, Idei, Nishino, Tanaka, Hasegawa, Yoshida • LATE (RF start-up) Kyoto University – Uchida, Watanabe • UTST & MAST (Merging start-up) Univ. of Tokyo - Yamada • TST-2 (Lower Hybrid) Univ. of Tokyo – Wakatsuki, Ejiri • HIST (Univ. of Hyogo) – Nagata • SUNIST (Tsinghua Univ.) – Tan, Xie • VEST (Seoul National Univ.) Hwang, Chung • LTX (PPPL) – Majeski • MEDUSA (Univ. of Nuevo León) – Ribeiro • TOKASTAR-2 (Nagoya Univ.) Hasegawa • HIT-Si (Steady State Inductive start-up) Univ. of Washington – Victor • TS3, TS4 (Univ. of Tokyo) – Y.Ono • Covered in this Talk, Covered by others/PPPL work

  3. Pegasus (Fonck)

  4. Experiments Confirm Relaxation Limit Scaling with Toroidal Field and Injector Current

  5. Gun-Electrode Geometry: PF induction, Plasma size

  6. Active Gun / Passive Electrode Assembly Points to Simpler, Higher Ip Operation

  7. Initial Tests of Gun/Electrode Helicity Injection Systems are Promising (up to 170kA achieved)

  8. Now Developing Larger Surface Area Electrodes

  9. VEST, Seoul National University (Hwang, Chung)

  10. Double Null Merging with Partial Solenoids

  11. Sequential Plasma Injection for Ramp-up

  12. Innovative Divertor Concepts

  13. UTST (Univ. of Tokyo) - Yamada Double Null Merging (DNM) in UTST with external PF coils - up to 190kA obtained with Central Solenoid induction (~50kA without) PS coils generate STs at null point

  14. Double Null Merging – only (50 kA)

  15. Double Null Merging + CS induction (160 kA)

  16. HIT-SI Spheromak, Brian Victor (U Washington)Ip of 50kA and Record CM of 3 obtained Advances in steady inductive helicity injection for plasma start-up and toroidal current drive

  17. Improvement in Toroidal Current is as a result of improved wall conditioning and density control

  18. HIST – Univ. of Hyogo (Nagata)

  19. Double Pulsing CHI discharge

  20. Flux and Current Amplification

  21. Ribeiro - poster • The former spherical tokamak MEDUSA (Madison EDUcation Small Aspect ratio tokamak, R < 0.14m, a < 0.10m, BT< 0.5T, Ip < 40kA, 3ms pulse) is currently being transferred to the Autonomous University of Nuevo León (UANL), Mexico • Goal is student training

  22. Tokastar-2, Nagoya Univ., Hasegawa

  23. Preliminary Test with OH induction produced 90A

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