Presentation is loading. Please wait.

Presentation is loading. Please wait.

HL-2A Heating & Current Driving by LHW and ECW study on HL-2A Bai Xingyu, HL-2A heating team.

Published byHenry Gilmore Modified over 8 years ago

Similar presentations

Presentation on theme: "HL-2A Heating & Current Driving by LHW and ECW study on HL-2A Bai Xingyu, HL-2A heating team."— Presentation transcript:

1 HL-2A Heating & Current Driving by LHW and ECW study on HL-2A Bai Xingyu, HL-2A heating team

2 HL-2A Outline  Introduction  EC experiments ECCD experiments ECRH experiments Pre-ionization and Assisted Startup  LHCD experiments  LHCD &ECCD experiments  Summary

3 HL-2A Introduction HL-2A is a normal Tokamak device of China, located in SWIP Chengdu Sichuan Province. Its main parameters ： B t =2.7T, t=5s, R=1.65m, r=0.4m, T e =5keV, I p =450kA, n e =6*10 19 m -3 HL-2M is on building

4 HL-2A Introduction EC system ：  68GHz : 6*500kW gyrotrons 2 antenna in 2 windows Rotatable mirror Duration 1s*4+1.5s*2  140GHz : 2*1MW gyrotrons 1 shared antenna Rotatable mirror Duration 3s 8 gyrotrons for ECRH

5 HL-2A Introduction LH system ： 2*500kW klystrons 2*12 antenna n || =2.75 f=2.45GHz

6 HL-2A Outline  Introduction  EC experiments ECCD experiments ECRH experiments Pre-ionization and Assisted Startup  LHCD experiments  LHCD &ECCD experiments  Summary

7 HL-2A EC experiments EC antenna structure of HL-2A EC antenna (new) ：  Rotatable in P direction: Lower 2 mirrors 1MW/140GHz only  Rotatable in T direction: All mirrors Left for right & right for left

8 HL-2A In ECRH condition, I p =I OH +I b +I EC Where I OH =V l / R V l is loop voltage R is the plasma resistance I b ≈c ɛ 1/2  p I p is Bootstrap current c≈1/3 is proportionality constant ɛ is the aspect radio I EC is driving current ECCD experiments For the plasma is approximate constant, R&  p is constant We know that I EC0 =0 when EC is injected in vertical direction So the driving current in different direction can be obtained by I EC ≈(1-c ɛ 1/2  p )(I p -V l I p0 /V l 0 ) Where I p0 &V l 0 are separately plasma current and loop voltage in vertical injection condition

9 HL-2A ECCD experiments ShotΦ (degree) dI OH /dt (kA/s) I EC (kA)  EC (10 19 A m -2 W -1 ) 20104-8-10.534-11.910.098 20105-6-11.402-25.660.122 20106-4-10.149-5.8130.033 201070-9.78200 20108-10-10.51-11.530.08 ECCD efficiency has an optimized inject angle

10 HL-2A ECRH experiments H mode is obtained for the first time on HL-2A in 2009 （ shot 11333 ） H mode can be obtained by ECRH and NBI or only NBI on HL-2A PEC=1.62MW ， PNBI=0.26MW (22151) NBI power is much less than the H mode threshold (MIN NBI power is 570kW for L-H transition) The output power of EC system (3MW/68GHz) can reach 2.5MW Can H mode be obtained only by ECRH ? ECRH NBI

11 HL-2A ECRH experiments ECRH-H mode W7-AS [V. Erckmann, PRL1993] 0.45MW/140GHz/X2 DIII-D [J. Lohr, PRL1988] 60GHz/0.9MW/X2 r/a - 0~0.3 ASDEX-U [F. Ryter, NF2009] 140GHz/>1.3MW/X2 r/a=0~0.3

12 HL-2A ECRH experiments SMBI makes ne increase rapidly. limit cycle oscillation (LCO) appears in the following ne-decrease section Conditions: Siliconized wall Ne is controlled above 1.5 by SMBI Displacement and X point angle control Bt=1.34 ， inject point r/a=0.45 ECRH power1.5MW Long SMBI

13 HL-2A ECRH experiments LCO phenomenon with ELMs feature 22909 NBI H-mode 23065 1kHz Bt~1.31T, r/a~0.3, P ECRH ~1.6MW During ECRH ， the displacement is controlled minus to avoid cutting off. Ne is feedback controlled 1.75 by SMBI. LCO frequency is 2-3kHz. Once (700ms~800ms) 1kHz component appears. And the oscillation waveform has ELMs feature

14 HL-2A ECRH experiments Pump out phenomenon: Ne decreases while ECRH power increases and remain stable at a certain value. In the new profile, ne decreases in core and increases on the edge. Ne profile is changed from peaking to hollow NBI ECRH In the ECRH H mode experiments, pump out phenomenon is a big problem ECRH Te ↑ ne ↓ Power threshold ↑ electron-ion collision rate ↓ Ti ↓ Harder L-H transition

15 HL-2A Pre-ionization & Assisted Startup On HL-2A, in order to build up scenarios for ECRH pre-ionization and assisted startup to relax the conditions required to breakdown and startup plasma on HL-2M, and to clarify the ITPA IOS2.3 open issue, ECRH pre-ionization and assisted startup experiments have been carried out during 2010, 2011 and 2012 experiment campaigns

16 HL-2A Pre-ionization & Assisted Startup Waveform for min ECRH power and pure ohmic start up Min breakdown voltage ： 0.5V Toroidal Electric field ： 0.05V/m ( 1/6 ITER value) Tt is the smallest value ever obtained by Tokamak Min breakdown voltage of ohmic: 3.4V The minimum breakdown voltage was reduced much

17 HL-2A ITPA IOS2.3 open issue The earlier application of loop voltage does not delay or hinder the avalanche formation on HL-2A, and even better than that of later application of loop voltage. There is no problem for earlier application of loop voltage. Why shorter delay times for earlier application? Loop voltage may accelerate the initial free electrons (about 0.03 eV) to a higher energy value close to subcritical energy, so the X2 mode absorption rate become higher, which causes the earlier breakdown.

18 HL-2A Pre-ionization & Assisted Startup Shot: 14444 O1-mode P=200kW t=108ms, 117ms Shot: 16289 X2-mode P=600kW t=108ms, 117ms angle 0°, Shot: 16617 X2-mode P=800kW t=126ms, 135ms angle 20°  The minimum ECRH powers O1- mode ： 200kW X2- mode ： 300kW  Parameter influence wall condition prefilled gas pressure field null structure toroidal injection angle

19 HL-2A Outline  Introduction  EC experiments ECCD experiments ECRH experiments Pre-ionization and Assisted Startup  LHCD experiments  LHCD &ECCD experiments  Summary

20 HL-2A In LHCD condition, I p =I OH +I b +I LH Where I OH =V l / R While without LHCD, I p0 =I OH0 + I b0 For the plasma current is feed back controlled, I p should be the same as that without LHCD. I b is considered to be constant and small (less than 10% I p ) I p = I p0, I b = I b0, I p ≈ I OH =V l / R, So, I LH =I OH0 -I OH Which means I LH ≈ I p Δ V l /V l But the fact is a little more complex. Ip is not controlled completely. LHCD experiments

21 HL-2A I LH is formed by 2 components: I LH =I ΔVl + ΔI p Where ΔI p can be read from data Typical LHCD result on HL-2A

22 HL-2A LHCD experiments Shot LHCD power （ kW ）  LH (10 19 Am -2 W -1 ) RC （ % ） limiter （ cm ） Ne (10 19 m -3 ) 975157.50.08530.6391.1 9752570.09428.9391.8 976389.80.01315.5380.9 977195.80.05936.4380.86 977295.10.06235.8380.92 9773101.20.03337381.85 9778123.10.03223.2380.84 9782119.20.07726.8380.57 978892.50.15529.8381.45 978992.20.25436.3380.91 979095.10.17136.3380.82 979193.50.18135.7380.95 996448.40.0120.3380.56 996539.30.0535.1380.6 LHCD efficiency on HL-2A

23 HL-2A Outline  Introduction  EC experiments ECCD experiments ECRH experiments Pre-ionization and Assisted Startup  LHCD experiments  LHCD &ECCD experiments  Summary

24 HL-2A LHCD &ECCD experiments Full CD obtained by LHCD&ECCD shot RC （ % ） With ECCD 977136.4 NO 977235.8 NO 977337 NO 977434.2 YES 977528.2 YES 977625.1 YES 977722.3 YES 977823.2 YES 9779Ip disturb YES 9780Ip disturb YES 978126.2 YES 978226.8YES ECCD improve absorption of LHW Why ECCD can improve LHW absorption ？ Pump out phenomenon makes particle move out, which increase edge density. That form a puffing gas effect on the edge, which make LHW coupling better.

25 HL-2A Outline  Introduction  EC experiments ECCD experiments ECRH experiments Pre-ionization and Assisted Startup  LHCD experiments  LHCD &ECCD experiments  Summary

26 HL-2A Summary  EC experiments was carried out on HL-2A ECCD efficiency was estimated and compared with theory H mode experiments by ECRH only was tried. LCO phenomenon with ELMs feature was obtained Pre-ionization and assisted startup experiment by ECW was carried out. The smallest Toroidal electric field ever in Tokamak is obtained. The result shows that earlier application of loop voltage does not delay or hinder the avalanche formation, even better, which solves ITPA IOS2.3 open issue  LHCD experiments was carried out on HL-2A LHCD efficiency was estimated  LHCD &ECCD experiments was carried out also Full CD was observed ECCD improve LHCD coupling phenomenon was achieved and analyzed

27 HL-2A

Download ppt "HL-2A Heating & Current Driving by LHW and ECW study on HL-2A Bai Xingyu, HL-2A heating team."

Similar presentations

HL-2AHL-2A ECRH pre-ionization and assisted startup on HL-2A SONG Xianming, CHEN Liaoyuan ZHANG Jinghua, ZHOU Jun, LI Jiaxian Southwestern Institute of.

HL-2AHL-2A ECRH pre-ionization and assisted startup on HL-2A SONG Xianming, CHEN Liaoyuan ZHANG Jinghua, ZHOU Jun, LI Jiaxian Southwestern Institute of.
JongGab Jo, H. Y. Lee, Y. H. An, K. J. Chung and Y. S. Hwang* Effective pre-ionization using fundamental extraordinary mode with XB mode conversion in.

JongGab Jo, H. Y. Lee, Y. H. An, K. J. Chung and Y. S. Hwang* Effective pre-ionization using fundamental extraordinary mode with XB mode conversion in.
ASIPP Characteristics of edge localized modes in the superconducting tokamak EAST M. Jiang Institute of Plasma Physics Chinese Academy of Sciences The.

ASIPP Characteristics of edge localized modes in the superconducting tokamak EAST M. Jiang Institute of Plasma Physics Chinese Academy of Sciences The.
1 G.T. Hoang TORE SUPRA Association Euratom-Cea TTF, Madison, Apr 2003 G.T. Hoang, C. Bourdelle, B. Pégourié, J. F. Artaud, J.Bucalossi, F. Clairet, C.

1 G.T. Hoang TORE SUPRA Association Euratom-Cea TTF, Madison, Apr 2003 G.T. Hoang, C. Bourdelle, B. Pégourié, J. F. Artaud, J.Bucalossi, F. Clairet, C.
1 Recent Experimental Results on HL-2A HL-2A Team presented by X.T. Ding Southwestern Institute of Physics, Chengdu, China In collaboration with USTC,

1 Recent Experimental Results on HL-2A HL-2A Team presented by X.T. Ding Southwestern Institute of Physics, Chengdu, China In collaboration with USTC,
HL-2A Southwestern Institute of Physics 1/15 Experimental Studies of ELMy H-mode on HL-2A Tokamak Y. Huang J.Q.Dong, L.W.Yan, X.T.Ding X.R.Duan, HL-2A.

HL-2A Southwestern Institute of Physics 1/15 Experimental Studies of ELMy H-mode on HL-2A Tokamak Y. Huang J.Q.Dong, L.W.Yan, X.T.Ding X.R.Duan, HL-2A.
New Experimental Results Obtained using Microwave Reflectometry in HL-2A Tokamak W.W. Xiao1), X.T. Ding1), X.L. Zou2), Z.T. Liu1), Y.D. Gao1), J.Q. Dong1),

New Experimental Results Obtained using Microwave Reflectometry in HL-2A Tokamak W.W. Xiao1), X.T. Ding1), X.L. Zou2), Z.T. Liu1), Y.D. Gao1), J.Q. Dong1),
Fundamental X-mode Electron Cyclotron Current Drive using Remote-Steering Symmetric Direction Antenna at Larger Steering Angles H. Idei 1, K. Hanada 1,

Fundamental X-mode Electron Cyclotron Current Drive using Remote-Steering Symmetric Direction Antenna at Larger Steering Angles H. Idei 1, K. Hanada 1,
D. Borba 1 21 st IAEA Fusion Energy Conference, Chengdu China 21 st October 2006 Excitation of Alfvén eigenmodes with sub-Alfvénic neutral beam ions in.

D. Borba 1 21 st IAEA Fusion Energy Conference, Chengdu China 21 st October 2006 Excitation of Alfvén eigenmodes with sub-Alfvénic neutral beam ions in.
1 Electron Bernstein Wave Research and Plans Gary Taylor Presentation to the 16th NSTX Program Advisory Committee September 9, 2004.

1 Electron Bernstein Wave Research and Plans Gary Taylor Presentation to the 16th NSTX Program Advisory Committee September 9, 2004.
1 ST workshop 2008 Conception of LHCD Experiments on the Spherical Tokamak Globus-M O.N. Shcherbinin, V.V. Dyachenko, M.A. Irzak, S.A. Khitrov A.F.Ioffe.

1 ST workshop 2008 Conception of LHCD Experiments on the Spherical Tokamak Globus-M O.N. Shcherbinin, V.V. Dyachenko, M.A. Irzak, S.A. Khitrov A.F.Ioffe.
1 ST workshop 2005 Numerical modeling and experimental study of ICR heating in the spherical tokamak Globus-M O.N.Shcherbinin, F.V.Chernyshev, V.V.Dyachenko,

1 ST workshop 2005 Numerical modeling and experimental study of ICR heating in the spherical tokamak Globus-M O.N.Shcherbinin, F.V.Chernyshev, V.V.Dyachenko,
H. Urano, H. Takenaga, T. Fujita, Y. Kamada, K. Kamiya, Y. Koide, N. Oyama, M. Yoshida and the JT-60 Team Japan Atomic Energy Agency JT-60U Tokamak: p.

H. Urano, H. Takenaga, T. Fujita, Y. Kamada, K. Kamiya, Y. Koide, N. Oyama, M. Yoshida and the JT-60 Team Japan Atomic Energy Agency JT-60U Tokamak: p.
Advanced Tokamak Plasmas and the Fusion Ignition Research Experiment Charles Kessel Princeton Plasma Physics Laboratory Spring APS, Philadelphia, 4/5/2003.

Advanced Tokamak Plasmas and the Fusion Ignition Research Experiment Charles Kessel Princeton Plasma Physics Laboratory Spring APS, Philadelphia, 4/5/2003.
Study of transport simulation on RF heated and current driven EAST plasma Siye Ding Under instruction of Prof. Baonian Wan 12/09/2009.

Study of transport simulation on RF heated and current driven EAST plasma Siye Ding Under instruction of Prof. Baonian Wan 12/09/2009.
Profile Measurement of HSX Plasma Using Thomson Scattering K. Zhai, F.S.B. Anderson, J. Canik, K. Likin, K. J. Willis, D.T. Anderson, HSX Plasma Laboratory,

Profile Measurement of HSX Plasma Using Thomson Scattering K. Zhai, F.S.B. Anderson, J. Canik, K. Likin, K. J. Willis, D.T. Anderson, HSX Plasma Laboratory,
H-mode characteristics close to L-H threshold power ITPA T&C and Pedestal meeting, October 09, Princeton Yves Martin 1, M.Greenwald, A.Hubbard, J.Hughes,

H-mode characteristics close to L-H threshold power ITPA T&C and Pedestal meeting, October 09, Princeton Yves Martin 1, M.Greenwald, A.Hubbard, J.Hughes,
Excitation of ion temperature gradient and trapped electron modes in HL-2A tokamak The 3 th Annual Workshop on Fusion Simulation and Theory, Hefei, March.

Excitation of ion temperature gradient and trapped electron modes in HL-2A tokamak The 3 th Annual Workshop on Fusion Simulation and Theory, Hefei, March.
The study of MARFE during long pulse discharges in the HT-7 tokamak W.Gao, X.Gao, M.Asif, Z.W.Wu, B.L.Ling, and J.G.Li Institute of Plasma Physics, Chinese.

The study of MARFE during long pulse discharges in the HT-7 tokamak W.Gao, X.Gao, M.Asif, Z.W.Wu, B.L.Ling, and J.G.Li Institute of Plasma Physics, Chinese.
Longwen Yan, Experimental Progress on HL-2A, 6-8 Jan. 2014, Tsinghua University, Beijing 1/29 HL-2A Southwestern Institute of Physics, Chengdu, China Experimental.

Longwen Yan, Experimental Progress on HL-2A, 6-8 Jan. 2014, Tsinghua University, Beijing 1/29 HL-2A Southwestern Institute of Physics, Chengdu, China Experimental.

Similar presentations

Ads by Google