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H-1 Heliac: Parameters 3 period heliac: 1992 Major radius1m Minor radius0.1-0.2m Vacuum chamber33m 2 Aspect ratio5+ Magnetic Field1 Tesla (0.2 DC) Heating.

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Presentation on theme: "H-1 Heliac: Parameters 3 period heliac: 1992 Major radius1m Minor radius0.1-0.2m Vacuum chamber33m 2 Aspect ratio5+ Magnetic Field1 Tesla (0.2 DC) Heating."— Presentation transcript:

1 H-1 Heliac: Parameters 3 period heliac: 1992 Major radius1m Minor radius m Vacuum chamber33m 2 Aspect ratio5+ Magnetic Field1 Tesla (0.2 DC) Heating Power0.2(0.4)MW GHz ECH 0.3MW 6-25MHz ICH Parameters: achieved / expected n3e18/1e19 T~100eV(T i )/0.5-1keV(T e )  0.1/0.5%

2 H-1 Heliac: Parameters 3 period heliac: 1992 Major radius1m Minor radius m Vacuum chamber33m 2 Aspect ratio5+ Magnetic Field1 Tesla (0.2 DC) Heating Power0.2(0.4)MW GHz ECH 0.3MW 6-25MHz ICH Parameters: achieved / expected n3e18/1e19 T~100eV(T i )/0.5-1keV(T e )  0.1/0.5% Complex geometry requires minimum 2D diagnostic Cross-section of the magnet structure showing a 3x11 channel tomographic diagnostic

3 Plasma production and heating: resonant and non-resonant RF m -3 Non-resonant heating is flexible in B 0, works better at low fields. Resonant heating is much more successful at high fields.  =  Ch on axis Magnetic Field (T) helicon/frame antenna Update with helium, Tesla

4 2D electron density tomography coherent drift mode in argon, 0.08T H density profile evolution (0.5T rf) Helical axis  non-circular  need true 2D Raw chordal dataTomographically inverted data

5 radius Ion Temperature Camera Hollow Ti at low B time (ms) Intensity temperature rotation

6 Confinement transitions in H-1 “Pressure” (I s ) profile evolution during transition transition P RF (kW) B 0 (T) many features in common with large machines associated with edge shear in Er easily reproduced and investigated Parameter space map,  ~ 1.4

7 ExB and ion bulk rotation velocity in high confinement mode: magnetic structure causes viscous damping of rotation 0 0 V p, V t << V ExB ~ 1/(neB) dP i /dr Radial force balance Mass (ion) flow velocities much smaller than corresponding V ExB Bulk Rotation Impeded

8 ExB and ion bulk rotation velocity in low and high confinement modes 0 0 V p, V t << V ExB ~ 1/(neB) dP i /dr Radial force balance Mass (ion) flow velocities much smaller than corresponding V ExB Fluctuations are Doppler shifted by electron ExB drift

9 Radial force balance is dominated by the ion pressure gradient and the radial electric field and is satisfied on average Radial force balance 0 0

10 Ion Temperature Camera Hollow Ti at low B 0 T i as rf power is ramped


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