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Beam Measurements in Vertical Array at R=79.9 cm

Analysis of beam signals in 7 channels with same central wavelength, beam profiles, and filter tuning. Detailed findings and comparison with theoretical models.

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Beam Measurements in Vertical Array at R=79.9 cm

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  1. BES Beam Measurements6/24/05 R. Bravenec

  2. Beam Signals 7 channels in vertical array at R = 79.9 cm Bandpass filters were all tuned to the same central wavelength (660 ± 1 nm). shot 1050525022: Vb= 42 kV Ib,max= 5.0 A nl_04 ~ 0.64

  3. Beam Profile, t = 0.479 s • Offset? • Channel 4 no longer significantly larger than others. • Amplitudes factor ~2 lower than model assuming 2 A neutrals at plasma edge. Vb= 42 kV Ib= 5 A nl_04 ~ 0.64

  4. Profile Before Beam • Smooth profile -> good channel-to-channel calibration (ch. 4 a little high)

  5. Beam Signals 7 channels in vertical array at R = 79.9 cm Bandpass filters were all tuned to the same central wavelength (658.5 nm). shot 1050525022: Vb= 46.5 kV Ib,max= 4.3 A nl_04 ~ 0.55

  6. Beam Profile, t = 0.525 s • NOT Gaussian Vb= 46.5 kV Ib= 4.3 A d1/e = 13.8 cm zpeak= -0.05 cm

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