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Gain Curves

Gain Curves. Jason for the SB Crew June 5, 2007. Raw 55 Fe Spectra. Start with 55 Fe spectrum from a MCA. Fit peak to gaussian. Calibration from a pulser turns channels into electrons. Mean of gaussian corresponds to signal from 109 electrons (in CF 4 ). Raw Curves.

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Gain Curves

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  1. Gain Curves Jason for the SB Crew June 5, 2007

  2. Raw 55Fe Spectra • Start with 55Fe spectrum from a MCA. • Fit peak to gaussian. • Calibration from a pulser turns channels into electrons. • Mean of gaussian corresponds to signal from 109 electrons (in CF4).

  3. Raw Curves • Procedure: • 14 hour gain saturation curve • to fully charge up the stack • waited ~2 hours with voltage on • to verify stable gain • measured gain as a function of dV • source rate: ~100 Hz

  4. Raw Curves • Procedure: • 14 hour gain saturation curve • to fully charge up the stack • waited ~2 hours with voltage on • to verify stable gain • measured gain as a function of dV • source rate: ~100 Hz

  5. P/T Corrections • sealed volume in gain test box allows for easy P/T mapping. • in very good agreement with WIS. • Therefore, gain can be adjusted for P/T variations…

  6. P/T Corrected Curves • Procedure: • 14 hour gain saturation curve • to fully charge up the stack • waited ~2 hours with voltage on • to verify stable gain • measured gain as a function of dV • corrected for P/T !! • source rate: ~100 Hz

  7. P/T Corrected Curves • Procedure: • 14 hour gain saturation curve • to fully charge up the stack • waited ~2 hours with voltage on • to verify stable gain • measured gain as a function of dV • corrected for P/T !! • source rate: ~100 Hz

  8. Gain Saturation Curve • Sample gain every two minutes for 14 hours. • Fit saturation curve to saturating exponential. • Gives the ability to extrapolate gain.

  9. Completely Corrected Curves • Procedure: • 14 hour gain saturation curve • to fully charge up the stack • waited ~2 hours with voltage on • to verify stable gain • measured gain as a function of dV • corrected for P/T !! • use extrapolated saturation curve to correct for time… • SB sees a factor of ~2 • source rate: ~100 Hz

  10. Completely Corrected Curves • Procedure: • 14 hour gain saturation curve • to fully charge up the stack • waited ~2 hours with voltage on • to verify stable gain • measured gain as a function of dV • corrected for P/T !! • use extrapolated saturation curve to correct for time… • SB sees a factor of ~2 • source rate: ~100 Hz

  11. Completely Corrected Curves • Procedure: • 14 hour gain saturation curve • to fully charge up the stack • waited ~2 hours with voltage on • to verify stable gain • measured gain as a function of dV • corrected for P/T !! • use extrapolated saturation curve to correct for time… • source rate: ~100 Hz **note** the WIS data is from two different stacks… a gem was exchanged. --maybe not comparable.

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