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RF Noise XMP - Dave Swain's Comments

RF Noise in Vacuum Fire each transmitter separately, no plasma or field, but take a "shot" to get B-dot coil signals as well as rf signals. This can be done nights, weekends, or does it? Analyze to see what signal levels are in various B-dot control coils are vs transmitter.

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RF Noise XMP - Dave Swain's Comments

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  1. RF Noise in Vacuum Fire each transmitter separately, no plasma or field, but take a "shot" to get B-dot coil signals as well as rf signals. This can be done nights, weekends, or does it? Analyze to see what signal levels are in various B-dot control coils are vs transmitter. Maybe do full transmitter shot in vacuum with all 6 sources on Should we try slow, fast, and CD phasing? RF Noise XMP - Dave Swain's Comments 1

  2. RF Noise with Plasma Look at the noise on the B-dot coils as a function of transmitter Maybe multiple transmitters with different phasing, outer gap, (inner gap?),.... what else? Can we still fire each transmitter sequentially during the same shot? This would decrease the number of shots needed. My guess is 5-10 shots needed RF Noise XMP - Dave Swain's Comments - II 2

  3. Vacuum Breakdown Voltage Usual conditioning, but we take some "official" shots once conditioning looks pretty good, just so we will have vacuum operating voltages with no B-field documented? Vacuum Breakdown with B-field Same as above, but lets put the magnetic field on. This may use up a few "real" shots. Useful to document the degradation of breakdown with JUST B-field. Neutral Pressure Scan with No Plasma? Might give an idea of whether the neutral pressure is a factor in the breakdowns with plasma. May want to add B also? Probably wait on this one. RF Breakdown XMP - Dave Swain's Comments 3

  4. RF Breakdown XMP - Dave Swain's Comments - II • Look for Breakdown During Plasma Shot. • Maybe power ramp of ~100 ms duration to scope out breakdown voltage; need stable quiescent plasma. • Data-mining showed no big correlation of breakdown to any of the usual knobs that are easy to adjust, so I don't know whether its worth doing B, I, or gap scans • Look at Power Delivered vs. Number of Transmitters • During past ops, it seemed a few transmitters could deliver almost as much power as all six. It might be good to check this out by running (say) only two transmitters and seeing what the breakdown power and voltage are and compare to all six 4

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