xp-720: ebw coupling at 8-36 ghz in h-mode plasmas
DESCRIPTION
XP-720: EBW coupling at 8-36 GHz in H-Mode Plasmas. Target discharge: I p =1 MA, B t =4.5 kG, T e (0)~0.75 keV, n e (0)~6x10 13 cm -3 Vertical position scan target plasma zmaxis=-2.1 cm moved to 0 cm and -2.8 cm. XP-720: EBW coupling at 8-36 GHz in H-Mode Plasmas. Outer gap scan - PowerPoint PPT PresentationTRANSCRIPT
XP-720: EBW coupling at 8-36 GHz in H-Mode Plasmas
• Target discharge: Ip=1 MA, Bt=4.5 kG,
Te(0)~0.75 keV, ne(0)~6x1013 cm-3
• Vertical position scan– target plasma zmaxis=-2.1 cm– moved to 0 cm and -2.8 cm
0.7
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0.5
0.4
0.3
0.2
0.1
Trad
[keV]
1.00.80.60.40.20.0
Time [s]
Vertical Scan, f=15.5 GHz zmaxis = 0 cm zmaxis = -2.8 cm
XP-720: EBW coupling at 8-36 GHz in H-Mode Plasmas
0.15
0.10
0.05
0.000.80.60.40.20.0
Time (s)
Outer Gap Scan gap=7.9 cm gap=4.4 cm gap=11.2 cm
• Outer gap scan– target plasma outer gap = 7.9 cm– moved to 4.4 and 11.2 cm
f=17 GHz
XP-720: EBW coupling at 8-36 GHz in H-Mode Plasmas
0.12
0.10
0.08
0.06
0.04
0.02
0.00
Trad [keV]
0.80.60.40.20.0
Time [s]
Target plasma, κ=2.06 κ=2.37, 4.5-5 TF ramp kG
=28 f GHz
0.14
0.12
0.10
0.08
0.06
0.04
0.02
0.00
Trad [keV]
0.80.60.40.20.0
Time [s]
Target plasma, κ=2.06 κ=2.37, 4.5-5 TF ramp kG
=17 f GHz
• Bootstrap current scan– target plasma, Bt=4.5 kG, κ=2.06
– increased κ to 2.37, TF ramp 4.5-5 kG at t=0.4 s
– Future work:• Try to reduce noise/possible ground loop in 8-18 GHz radiometer• Increase beam power to increase edge bootstrap current fraction• Introduce early H-L transition in H-mode target plasma