Experimental setup

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

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

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

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

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), [math]\displaystyle{ P_B = 3.97 Torr }[/math], [math]\displaystyle{ P_C = 4.5 Torr }[/math]