Copasetic Flow

Summary :  Initial results from the Dewar attenuation tests look odd.  They won’t be conclusively odd until all the sources have been measured for the same counting time.  At the moment, the Cs 137 32 keV line is less attenuated than the 22 keV Cd 109 line which is expected, but it also appears to be less attenuated than the Cd 109 88 keV line which is not expected.  It seems like a higher energy should have an easier time getting through the Dewar material. To Do Today: .        Calculate the count rate from the Cs 137 source and compare it to the expected flux from Hirsch’s theory .        Run a simulation on a much smaller diameter coil looking into quenching the small YBCO superconductor. .        Analyze the overnight run on Cs 137 Bias 1500 V Gate Window 0.5 uS Threshold 1.5mV Attenuatio...

Summary:   Longer spectrum runs were performed on each of the available low energy sources.  The channel vs. energy graph was re-plotted based on the new data.  The behavior is still linear.  The only issue at the moment, is that the signal levels are close to the noise count levels, causing the peaks from each of the sources to be fairly broad.  This should be OK.  since we're just looking for evidence of a signal at all, resolution won't be critical in this application.  The iron magnet cooling supply was completely installed and can supply two gallons per minute to the magnet, meeting the specification.  A Cs 137 Dewar attenuation spectrum was started.  The data will be collected on the morning of the 21 st . Bias 1500 V Gate Window 0.5 uS Threshold 1.5mV Attenuation 0 dB Data set HBC_00015 Source Cs 137 Taped to window Start Time 8:53 AM ...