The target ladder is set for position 7 - the double alpha source.

Looking at the FAIR DAQ, for the Far S2 the first RAL amplifier (XV) shows:

• Alphas at channel 700
• Pulser centroid at channel ~2640, with 9 channel FWHM -> corresponds to 44 keV FWHM at 4.91 keV/channel

The close S2 shows:

• Alphas at channel 700
• Same pulser centroid as far S2, with 6 channel FWHM -> corrsponds to 24 keV FWHM at 4.91 keV/channel

We reenabled the top ICU box channels 0 and 5 (disabled during Feb 2018 shift)

We started an alpha-source run using the 241Am and 239Pu source, type: EA X, product number: 111109-1242002. Photo of source storage case is attached.

Alpha activity at 25/03/2010: 8.153 kBq

We found the following strange behaviour

With DAQ list mode OFF:

• Trigger rate ~2300 - 2700/s
• Event mult ~ 140
• DT~18%

With DAQ list mode ON:

• Trigger rate ~300 - 900/s
• Event mult ~140
• DT ~ 70 - 90%

Currently ADC 2, 3, 4, and 5 are in use by the far and near S2's. ADC 6 and TDC 7 are not currently in use (we will need ADC 6 for the pin diode)

We set the lower threshold for ADC6 and TDC7 to 2046 out of 2047 channels - effectively disabling the two.

Now with list mode ON:

• Trigger rate ~ 1500 - 1700 /s
• Event mult ~ 65 - 70
• DT ~ 30 - 50 %

We restarted the DAQ machine

We started an alpha source run:

• Run number: 181122123034
• DT ~ 7 - 19%
• Trigger rate ~ 700 - 1000/s
• Event mult ~ 63

The PB-4 Pulser Settings are:

• Frequency: 250 Hz
• Delay: 1 us
• Rise Time: 0.1 us
• Fall Time: 100 us
• Reference: INT
• Polarity: +ve
• Amplitude on scope: 260mV
• Attenuation: X10 (X10 switch up, X2, X5, and the other X10 switch are down)