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1 Aerospace and Energetics Research Program University of Washington Seattle, WA 44th Annual Meeting of the Division of Plasma Physics of the American Physical Society November 11 - November 15, 2002 Orlando, FL
2 Ion Doppler Measurements in the HIT-II Spherical Torus P. Gu, T. R. Jarboe, B. A. Nelson A. J. Redd, R. J. Smith University of Washington M. Nagata, T. Uyama Himeji Institute of Technology
3 Abstract (Revised) Plasmas using coaxial helicity injection (CHI) current drive and ohmic ramping with peak current 248 ka were successfully produced on HIT-II. This demonstrates that a plasma can be produced using CHI and successfully transferred to another current drive method. A study of the ion toroidal velocity and temperature for various ion species (OV, NIV) using Ion Doppler Spectroscopy (IDS) has been investigated. IDS data from repeatable discharges, taken using chords with various impact parameters will be presented.
4 Doppler Broadening Measurement Doppler shift caused by thermal particle motion: λ = λυ/c whereλ : wavelength of the line [Å], υ : particle velocity [m/s], c : speed of light [m s -1 ] A Maxwellian velocity distribution gives rise to a Gaussian line profile: I( λ) = I0 exp[ Mc ( λ) /2κTiλ where M : mass of the emitting atom [kg], κ : Boltzmann's Constant [ev k -1 ] ] λ The Full Width at Half Maximum (FWHM) D λ D 5 = λ( κti / µ ) 1/ 2 where µ : atomic weight [g/mol -1 ] Ti : ion temperature :
5 CHI Discharges Show Larger Rotation Velocity Than CHI-Ohmic Mixed Discharges OV Line, Chord #9: SN (UPPER) Ip (A) n e_avg (m -3 ) IDS #7 IDS #10 IDS #8 IDS #11 IDS #9 IDS #12 Time (ms)
6 (cont.) OV Line, Chord #9: SN (LOWER) Ip (A) n e_avg (m -3 ) IDS #7 IDS #10 IDS #8 IDS #11 IDS #9 IDS #12 Time (ms)
7 Highest Toroidal Velocity at the Edge in CHI Discharges (OV Line) Chord #9: SN (upper) Chord #6: SN (upper) Chord #3: SN (upper) Chord #2: SN (upper)
8 CHI Flow Data Show OV Rotation Linear with R impact (ω=64000s -1 ) Chord #9: Impact Radius 41.4 cm----sn 19213, SN D Chord #6: Impact Radius 32.1 cm----sn Chord #3: Impact Radius 21.4 cm----sn 19208, SN Chord #2: Impact Radius 17.6 cm----sn 19204, SN Averaged over 3 ms < t < 6 ms. Note: To determine if thin shell or rigid rotor rotation, an intensity inversion is necessary.
9 Central Line Determined Using the Radial Port (Ip=248 ka) OV Line: SN Ip (A) IDS #9 IDS #6 IDS #10 IDS #7 IDS #11 IDS #8 IDS #12 Time (ms)
10 Raw Data Show Rotation Changes Direction after the Peak Current OV Line, Chord #1: SN Ip (A) IDS #9 IDS #6 IDS #10 IDS #7 IDS #11 IDS #8 IDS #12 Time (ms)
11 OV Line Burned through during High Current (248 ka) Ohmic Discharges (Velocities chords 10-6) Chord #10: SN Chord #9: SN Chord #8: SN Chord #7: SN Chord #6: SN 24557
12 OV Rotation Velocity Changes Direction Before and After the Peak Current during Ohmic Discharges(chords 4-1) Chord #4: SN Chord #3: SN Chord #2: SN Chord #1: SN 24563
13 NIV Rotation Velocity Does Not Show Rigid Rotor during Ohmic Discharges (chords 10-7) Chord #10: SN Chord #9: SN Chord #8: SN Chord #7: SN 24462
14 (cont.) (chords 6-3) Chord #6: SN Chord #4: SN Chord #3: SN 24465
15 OV Line Burned through during Ohmic Discharges in High Plasma Current (248 ka) (Temperatures chords 9-6) Chord #9: SN Chord #8: SN Chord #7: SN Chord #6: SN Instrument Temperature
16 Highest OV Temperature Seen at the Peak Current (248 ka) Chord #2: SN Chord #1: SN Instrument Temperature
17 NIV Temperature Is also Highest at the Peak Plasma Current (130 ka) (chords 7-3) Chord #7: SN Chord #6: SN Chord #4: SN Chord #3: SN Instrument Temperature
18 Both OV and NIV Have the Same Temperature OV, Radial Port: SN NIV, Radial Port: SN Instrument Temperature Instrument Temperature
19 Summary OV line was burned through during ohmic discharges in high current plasmas (Ip=248 ka). OV rotation velocity changes direction before and after the peak current during ohmic discharges. OV flow data show rigid rotor rotation with ω=64000s -1 in pure CHI discharges while NIV flow data do not show rigid rotor in ohmic discharges. OV temperatures are ~ 80 ev near the edge for high plasma currents (248 ka), and NIV central temperatures can be as high as ~ 100 ev with different plasma conditions (130 ka). Both OV and NIV temperature profiles show the same temperature (~ 40 ev) from the same radial port, for the same plasma conditions.
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