Recent experiments in the STOR-M Tokamak* Akira Hirose In collaboration with: C. Boucher (INRS-EMT),...
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Transcript of Recent experiments in the STOR-M Tokamak* Akira Hirose In collaboration with: C. Boucher (INRS-EMT),...
![Page 1: Recent experiments in the STOR-M Tokamak* Akira Hirose In collaboration with: C. Boucher (INRS-EMT), G. St. Germaine D. Liu, S. Livingstone, A. Singh,](https://reader035.fdocuments.net/reader035/viewer/2022062804/56649f0d5503460f94c21e43/html5/thumbnails/1.jpg)
Recent experiments in the STOR-M Recent experiments in the STOR-M Tokamak*Tokamak*
Akira Hirose
In collaboration with:C. Boucher (INRS-EMT), G. St. GermaineD. Liu, S. Livingstone, A. Singh, C. Xiao
Plasma Physics LaboratoryPlasma Physics LaboratoryUniversity of SaskatchewanUniversity of SaskatchewanSaskatoon, Saskatchewan, Canada
*Supported by NSERC, CRC
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PPL, Univ. of Sask.PPL, Univ. of Sask.Department of Physics & Engineering PhysicsDepartment of Physics & Engineering Physics
OutlineOutline
• Edge plasma flow measurements with Mach probes• Low frequency edge density and potential fluctuation
measurements with Langmuir probes (GAM)• Skin size ballooning mode (theory)• Density fluctuation measurements with 2 mm
microwave scattering (search for ETG and skin size mode)
• Vertical CT (compact torus) injection• Future plan
![Page 3: Recent experiments in the STOR-M Tokamak* Akira Hirose In collaboration with: C. Boucher (INRS-EMT), G. St. Germaine D. Liu, S. Livingstone, A. Singh,](https://reader035.fdocuments.net/reader035/viewer/2022062804/56649f0d5503460f94c21e43/html5/thumbnails/3.jpg)
PPL, Univ. of Sask.PPL, Univ. of Sask.Department of Physics & Engineering PhysicsDepartment of Physics & Engineering Physics
STOR-M top viewSTOR-M top view
![Page 4: Recent experiments in the STOR-M Tokamak* Akira Hirose In collaboration with: C. Boucher (INRS-EMT), G. St. Germaine D. Liu, S. Livingstone, A. Singh,](https://reader035.fdocuments.net/reader035/viewer/2022062804/56649f0d5503460f94c21e43/html5/thumbnails/4.jpg)
PPL, Univ. of Sask.PPL, Univ. of Sask.Department of Physics & Engineering PhysicsDepartment of Physics & Engineering Physics
STOR-M side viewSTOR-M side view
![Page 5: Recent experiments in the STOR-M Tokamak* Akira Hirose In collaboration with: C. Boucher (INRS-EMT), G. St. Germaine D. Liu, S. Livingstone, A. Singh,](https://reader035.fdocuments.net/reader035/viewer/2022062804/56649f0d5503460f94c21e43/html5/thumbnails/5.jpg)
PPL, Univ. of Sask.PPL, Univ. of Sask.Department of Physics & Engineering PhysicsDepartment of Physics & Engineering Physics
4-Pair Mach (Gundestrup) Probes4-Pair Mach (Gundestrup) Probes
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PPL, Univ. of Sask.PPL, Univ. of Sask.Department of Physics & Engineering PhysicsDepartment of Physics & Engineering Physics
Ohmic discharge (Ohmic discharge (IIp p counter to Bt)
Flow is predominantly along the magnetic field.
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PPL, Univ. of Sask.PPL, Univ. of Sask.Department of Physics & Engineering PhysicsDepartment of Physics & Engineering Physics
Parallel flow in the direction of current. Parallel flow in the direction of current.
t=17 ms r=10.5 cm
Bt
Ip
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PPL, Univ. of Sask.PPL, Univ. of Sask.Department of Physics & Engineering PhysicsDepartment of Physics & Engineering Physics
When the current is reversed, so is the When the current is reversed, so is the
flow.flow.
Bt
Ip
t=17 ms r=12 cm
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PPL, Univ. of Sask.PPL, Univ. of Sask.Department of Physics & Engineering PhysicsDepartment of Physics & Engineering Physics
Neoclassical theoryNeoclassical theory
• In an axisymmetric plasma,
Toroidal flow
Poloidal flow
may depend on collisionality
1 i ir dp dTEV V n
B enB dr dr
idTV VeB dr
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PPL, Univ. of Sask.PPL, Univ. of Sask.Department of Physics & Engineering PhysicsDepartment of Physics & Engineering Physics
Electrode BiasingElectrode Biasing
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PPL, Univ. of Sask.PPL, Univ. of Sask.Department of Physics & Engineering PhysicsDepartment of Physics & Engineering Physics
GAM (Geodesic Acoustic Mode)GAM (Geodesic Acoustic Mode)
• GAM frequency
• In GAM, the potential is symmetric but density perturbation is not,
• Excitation mechanism? Its roles?
sin , :GAMn poloidal angle
, (sound speed) = .ss
c Pc
R
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PPL, Univ. of Sask.PPL, Univ. of Sask.Department of Physics & Engineering PhysicsDepartment of Physics & Engineering Physics
Probes and locationsProbes and locations
= 0
- 45- 90
90
Probe locations
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PPL, Univ. of Sask.PPL, Univ. of Sask.Department of Physics & Engineering PhysicsDepartment of Physics & Engineering Physics
ObservationObservation
• Potential fluctuations have a peak at f ~ 12-15 kHz at all positions
• Density fluctuation has this peak except at the outer mid plane where it is small.
• Unclear what role is played by GAM in transport.
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PPL, Univ. of Sask.PPL, Univ. of Sask.Department of Physics & Engineering PhysicsDepartment of Physics & Engineering Physics
Power spectra of potential and density Power spectra of potential and density fluctuationsfluctuations
Density at -90 degrees (bottom)
Potential at 0 degree
Density at 0 degree
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PPL, Univ. of Sask.PPL, Univ. of Sask.Department of Physics & Engineering PhysicsDepartment of Physics & Engineering Physics
Skin size ballooning mode Skin size ballooning mode
• Skin size plasma turbulence has long been speculated. Such turbulence would explain Ohkawa diffusivity
and thus Alcator scaling • Earlier this year, a novel short wavelength
ballooning mode was predicted in the regime
2
pe
Tee
v c
qR
E en
.real De
222*
* 1 /e
De De e e De Tee i pe
ckk v
T T
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PPL, Univ. of Sask.PPL, Univ. of Sask.Department of Physics & Engineering PhysicsDepartment of Physics & Engineering Physics
Electron thermal diffusivity in units of Electron thermal diffusivity in units of gyro-Bohm gyro-Bohm 2Te
eGB en
v
L
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PPL, Univ. of Sask.PPL, Univ. of Sask.Department of Physics & Engineering PhysicsDepartment of Physics & Engineering Physics
Klystron
Directional Coupler
20dB
Two Attenuator
s
Phase
Shifter
Detector 2
Over-moded (WR-28) waveguide sections GOL
A Horn
Standard Gain Horn
Mixer
Isolator
Detector 1
Transmitted signal
Received signal
Power supply and cooling
system
Scattering Volume
Lower mirror
Upper mirror
Plasma
Reference Arm
E-H Tuner
Quartz windows
Vertical ports on STOR-M chamber
2 mm microwave scattering: experimental 2 mm microwave scattering: experimental setupsetup
Isolator
Directional Coupler
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PPL, Univ. of Sask.PPL, Univ. of Sask.Department of Physics & Engineering PhysicsDepartment of Physics & Engineering Physics
Dispersion relationDispersion relation
The solid line indicates the ion drift mode. The observed normalized frequency tends to be constant at high k.
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PPL, Univ. of Sask.PPL, Univ. of Sask.Department of Physics & Engineering PhysicsDepartment of Physics & Engineering Physics
Fueling Large TokamakFueling Large Tokamak
A.J.H. Donne et al. Fusion Sci. &Tech., January 2006 issue: “In the field of density control it has been concluded that there is not much flexibility in the fueling of ITER.” As part of their recommendations, they further state: “New fueling techniques should be tested on present devices. Given the prospects of CT (compact torus) injection, a test on a relatively large device is highly desirable.”
[Summary of 2005 IEA Workshop on Burning Plasma Physics and Simulations, Tarragona, Spain]
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PPL, Univ. of Sask.PPL, Univ. of Sask.Department of Physics & Engineering PhysicsDepartment of Physics & Engineering Physics
Compact Torus (CT) injectionCompact Torus (CT) injectionHorizontal vs. verticalHorizontal vs. vertical
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PPL, Univ. of Sask.PPL, Univ. of Sask.Department of Physics & Engineering PhysicsDepartment of Physics & Engineering Physics
USCTI with deflectorUSCTI with deflector
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PPL, Univ. of Sask.PPL, Univ. of Sask.Department of Physics & Engineering PhysicsDepartment of Physics & Engineering Physics
Effects of vertical CT injection (preliminary)Effects of vertical CT injection (preliminary)
0 5 10 15 20 25 30 350
1
2
3
4
5
6
7
8
9
n e (
1012
cm-3
)
Time (ms)
Shot: #170539
CT on
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PPL, Univ. of Sask.PPL, Univ. of Sask.Department of Physics & Engineering PhysicsDepartment of Physics & Engineering Physics
Vertical CT injection (cont.)Vertical CT injection (cont.)
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PPL, Univ. of Sask.PPL, Univ. of Sask.Department of Physics & Engineering PhysicsDepartment of Physics & Engineering Physics
Future planFuture plan
• Plasma flow: more complete plasma data are needed for comparison with the neoclassical theory
• Repetitive CT injection• Heterodyne 2 mm microwave scattering• Numerical simulations of the skin size
ballooning mode