Experimental program of ht 7 2001 fall campaign
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Experimental program of HT-7 2001 fall campaign. HT-7 team 2001.10. The goals to be achieved. Long pulse-length operation 5-10 s shot (>1keV,>100kA,>1x10 19 m -3 ) 、 Steady-state H-mode ( 100 time energy confinement time), try 20s plasma operation

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Experimental program of HT-7 2001 fall campaign

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Experimental program of HT-7 2001 fall campaign

HT-7 team

2001.10


The goals to be achieved

  • Long pulse-length operation

    5-10 s shot(>1keV,>100kA,>1x1019m-3)、Steady-state H-mode ( 100 time energy confinement time), try 20s plasma operation

  • Preparing enough data for the invite talks for following conference: IAEA, PSI, EPS, APS。

  • 2-4 unique experiments

    IBW, LHCD, LHCD+IBW, RF conditioning.

  • Several technical improvements for SSO

    1MW CW LHCD、1MW CW ICRF、CW PF power supply and control、 ripple reduction、CW first wall and particle exhaust.


Physical program

Plasma behavior of long pulse operation

  • Profiles measurements

  • edge plasma behavior

  • impurity transport

  • recycling

  • Er and shear flow

  • Energetic particles


Physical program

PWI under steady-state condition

  • RF conditioning (B, Si, Li) in the BT present

  • Real time D2 isotropic removing with BT

  • Heat and particle exhaust with new cry-pumps

  • Monitoring of FW (Te sensor, CCD)

  • Erosion and redeposition for the new graphite and coatings


Physical program

Plasma and wave interaction

  • Coupling for the new multi-junction LHW antenna;

  • Coupling for the new RF and IBW antenna;

  • impurities generated by new antennae;

  • Power deposition control with changeable N for both LHW and RF;

  • Energetic particles behavior with reduced ripple


Physical program

Profile controls:

  • Density by molecular beam injection (MBI from HFS and LFS) and RFH

  • Te by LHCD and IBW

  • j( r ) and MHD by LHCD

  • Er , EXB shear flow and ITB by IBW

  • P ( r ) by different wall coatings( B, Si, Li)

  • Edge radiation by Ne (Si) injection


Physical program

SS H-mode(>20 E), The synergy between RF and LHCD

  • H-mode by LHCD

  • H-mode by IBW

  • LHCD+IBW(mode-conversion ,direct launching),

  • LHCD+IBWCD

  • High density (>60% GW density limit) LHCD+IBWH(5/2 D) trial


Physical program

  • Transport and confinement

  • Scaling of E and P

  • Perturbation of density by GP and SSB

  • Perturbation of temperature (relaxation) by IBW

  • MHD during LHCD and IBW

  • Zonal Flow, SOC, Rynold Stress


Physical program

new diagnostics

  • Omegatron

  • IR CCD

  • neutron detector

  • FRC fast ECE

  • fast-moving Langmuir probe

  • S-X diode spectroscopy

  • CO2 laser scattering

  • HT-7U R&D (SXA, MP)


Advanced control for steady-state operation

  • Fast particle loss reduction with reduced ripple (Fe steel inserting in VV);

  • CW PF power supply and real-time plasma control;

  • Radiative mental;

  • New RF wall conditioning trial( Si, Li);

  • New first wall material and limiter;

  • Different fueling techniques;GP,MBI,pellet

  • CW data acquisition.


Schedule of the experiments24 h /day, 7 days /week

  • Oct. 29:close of all windows

  • Oct.30-Nov.13:Vacuum and cooling down

  • Nov.14-15:RF wall conditioning and discharge

  • Nov.16-25:experiments mainly for new hardware and engineering testing

  • Nov.26-30:Long pulse trial

  • Dec.1—25 physics experiments;

  • Dec.25—30:postponed proposals

  • Dec.31 : The end


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