Experimental setup

Collimator parameters: in upstream side of wall 5/8 $\rightarrow$ 3/4", in downstream side of wall 1/2".

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), $P_B = 3.97 Torr$, $P_C = 4.5 Torr$.

Figure 5: Beam produces nuclear fragments on $C^{12}$ and Al and fission fragments on $U^{235}$. P = 4.96 Torr (heptane), $N_{T1} \sim 4.6/100 sec$ (beam off), $N_{T1} \sim 2.75/100 sec$ (beam on!). Chambers are not stable due to vacuum leak. If nothing was changed this geometry was used to get all the energy spectra (http://www.iac.isu.edu/mediawiki/index.php/Energy_spectra_%28fiss_frag%29)

Figure 6: ADC distributions of $T_2$ (left) and $T_1$ (right). Data obtained via experimental setup shown in Figure 5.