Experimental setup

Figure 1: 8:21 am - $40 mAmps$ pulse, 200 ns, 300 Hz, $10^3 secs$ of beam, 6 fissions. 9:10 am - Threshold 80 mV, $N_{T1} = 17.6 counts/10 min$.

Figure 2: $\Delta T = 200 ns$, $I_e = 40 mA$, $f = 300 Hz$, $E_e = 20 MeV$, $q = 8.7 nC/pulse$. $N_{T1} = 12 counts/10 min$, $N_{T2} = 35 counts/10 min$

Figure 3: $\Delta T = 200 ns$, $I_e = 40 mA$, $f = 300 Hz$, $E_e = 20 MeV$, $q = 8.7 nC/pulse$. $N_{T2} = 46 counts/10 min$, threshold = 80 mV, $P_B = 33.9$

Figure 4: $\Delta T = 200 ns$, $I_e = 40 mA$, $f = 300 Hz$, $E_e = 20 MeV$, $q = 8.7 nC/pulse$. $N_{T2} \sim 48 counts/10 min$, $N_{T1} (thresh = 30 mV, beam on) = 1065 counts/10 min$, threshold = 80 mV, $P_B = 33.9$

Figure 4: This new architecture is used for obtaining timing spectra during runs 60 - 63 (http://www.iac.isu.edu/mediawiki/index.php/Timing_spectra), $P_B = 3.97 Torr$, $P_C = 4.5 Torr$