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 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

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

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…

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

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

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

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

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

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.