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SUNIST Spherical Tokamak rd th SUNISTSUNIST The 3 IAEA TCM on Spherical Torus and the 11 STW, St. Petersburg Preliminary experiment of plasma current startup by ECR wave on SUNIST spherical tokamak HE Yexi, ZHANG Liang, *FENG Chunhua, FU Hongjun, GAO Zhe, TAN Yi, WANG Wenhao, *WANG Long, *YANG Xuanzong, XIE Lifeng [email protected], 86-10-62791874 (o), 86-10-62782658 (fax) SUNIST United Laboratory Department of Engineering Physics, Tsinghua University, Beijing 100084, P.R.China *Institute of Physics, Chinese Academy of Science, Beijing 100080, P.R.China This work was supported by JSPS-CAS Core-University Program on Plasma and Nuclear Fusion, the National Nature and Science Fund of China (Grant numbers: 10275041 and 10375089) , and International Atomic Energy Agency (Research contract No. 12935/R0) . SUNIST- Sino UNIted Spherical Tokamak UNISTSUNISTUNISTSUNIST OUTLINE SUNIST spherical tokamak Preliminary result Remained questions UNISTSUNISTUNISTSUNIST SUNIST spherical tokamak SUNIST United Laboratory SUNIST United Laboratory founded in 2004, consists of Department of Engineering Physics, Tsinghus University (DEP) ; Institute of Physics, Chinese Academy of Science (IOP) and keeping very close collaboration with Southwestern Institute of Physics (SWIP) and Institute of Plasma Physics, Chinese Academy of Science (IPPAS). Members of SUNIST Laboratory He, Yexi Department of Engineering Physics, Tsinghua University, Beijing 100084, P.R.China, 86-10- 62791874(lab), 86-10-62782658(fax), [email protected] (e-mail) Yang, Xuanzong Institute of Physics, Chinese Academy of Science, Beijing 100080, P.R.China 86-10- 82649132(office), [email protected] (e-mail) Wang, Long Institute of Physics, Chinese Academy of Science, Beijing 100080, P.R.China 86-10- 82649137(office), [email protected] (e-mail) Feng, Chunhua Institute of Physics, Chinese Academy of Science, Beijing 100080, P.R.China 86-10- 82649132(office), [email protected] (e-mail) Gao, Zhe Department of Engineering Physics, Tsinghua University, Beijing 100084, P.R.China, 86-10- 62776446(lab), 86-10-62782658(fax), [email protected] (e-mail) Wang, Wenhao Department of Engineering Physics, Tsinghua University, Beijing 100084, P.R.China, 86-10-62776446(lab), 86-10-62782658(fax), [email protected] (e-mail) Xie, Lifeng Department of Engineering Physics, Tsinghua University, Beijing 100084, P.R.China, 86- 10-62776446(lab), 86-10-62782658(fax), [email protected] (e-mail) SUNISTSUNIST SUNIST spherical tokamak SUNIST spherical tokamak SUNIST main parameters: major radius R 0.3m minor radius a 0.23m Aspect ratio A ~1.3 elongation κ ~1.6 toroidal field （R0） BT 0.15T plasma current IP 0.05MA flux (double swing) ΔΦ 0.06Vs UNISTSUNIST UNISTSUNIST SUNIST spherical tokamak SUNIST spherical tokamak magnets and power supply Vacuum vessel and BV magnet assembling toroidal magnet pre-assembling Cross section and designed magnetic surface coil turn L(μH) R(mΩ) ID(kA) VC(V) Capacitor(mF) TF 24 508 4.72 9.4 200 2560(1280) HF 236 519 17.8 13 3000 13.3/1280 EF 26 684 15 1.5 1200/120 1(2)/476(18.8) SUNISTSUNIST SUNIST spherical tokamak SUNIST spherical tokamak vacuum and vacuum vessel main parameters – vacuum vessel: outer diameter 1.2 m inner diameter 0.13 m height 1.2 m volume ~ 1 m3 surface area ~ 2.3 m2 vacuum pumps: TMP (1000l//s) Sputtering Ti pump (200l/s) wall conditioning: baking: PTC（Curie point 160 0C) glowing discharge, siliconization -5 background pressure: ~ 6×10 Pa -7 3 leaking rate on cross seal: ≯2×10 Pam /s SUNISTSUNIST SUNIST spherical tokamak SUNIST spherical tokamak diagnostics and data acquisition Diagnostics electromagnetic probes: 2 Rogowski probes, 9 flux loops (4 inside vessel) 15 2-D minor probes (13 in one poloidal cross section) electrostatic probes: sets of movable 4 probes for Isi, Φ, and Vtoroidal Data acquisition: 48 channel ADC: 32ch new, 16ch used in CT-6B SUNISTSUNIST SUNIST spherical tokamak Typical Discharge UNISTSUNISTUNISTSUNIST OUTLINE SUNIST spherical tokamak Preliminary result Remained questions SUNISTSUNIST Preliminary result Typical discharge of ECR startup Microwave: Pout < 100kW, t pulse ~ 30 ms, f = 2.45 GHz background pressure ~ 1×10-4 Pascal hydrogen pressure ~ 1×10-2 Pascal during discharge SUNISTSUNIST Preliminary result Discharge with a group of plasma current peaks SUNISTSUNIST Preliminary result Dependence of plasma current on vertical field SUNISTSUNIST Preliminary result Electrode arrangement SUNISTSUNIST Preliminary result Typical discharge with electrode assistance SUNISTSUNIST Preliminary result Plasma current counteracted by electrode current SUNISTSUNIST Preliminary result One special discharge with electrode assistance SUNISTSUNIST Preliminary result Performances of preliminary ECR current startup Plasma current is just spikes ~ hundreds millisecond of bottom width when the plasma existed during wave injecting from the lightening signal. The dependence of driven IP on vertical field is consistent with the toroidal plasma current by vertical field drift effect in ECR plasma. IP could increase above 10% (Fig. 7) in co-direction, IP would be counteracted more obviously (Fig.8), in counter- direction with electrode discharge assistance. We obtained one special discharge that the currents of plasma and electrode are cutoff and extended to wave timescale. UNISTSUNISTUNISTSUNIST OUTLINE SUNIST spherical tokamak Preliminary result Remained questions SUNISTSUNIST Remained questions Remained questions This kind of plasma current spike is impossible to develop to typical ST plasma current. It is necessary to rearrange launch system of microwave for better coupling to plasma. SUNISTSUNIST Remained questions Remained questions The discharge shown in Fig. 9 suggests that there is a discharge regime with no limitations of density cut off on ECR current startup and Ii-sat with electrode discharge assistance. The questions are why this regime exists and how to find it for developing it from occasional event to reproducible discharge. SUNISTSUNIST Remained questions Remained questions In preliminary experiments, the background pressure of vacuum vessel increased from less than 1×10-4 Pascal up to a balanced value, ~ 3×10-4 Pascal. Driven plasma current decreased with the increase of background pressure just like to scan fuelling gas to higher pressure. It is necessary to control wall condition for further experiments. rd th SUNISTSUNIST The 3 IAEA TCM on Spherical Torus and the 11 STW, St. Petersburg Preliminary experiment of plasma current startup by ECR wave on SUNIST spherical tokamak THANKS SUNIST- Sino UNIted Spherical Tokamak SUNISTSUNIST A questions about central solenoid - Is it impossible to keep? hard mode save mode too high J CS,then stress,thermal load in high Φ neutron problem moderate J CS, just operating very short time operation mode conclusion Impossible to keep ?.
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