Pulser spectra

• Changes to the nn pulser circuit yesterday have improved the peak widths on the p+n side
• p+n peak widths averact around 100 channels
• n+n around 1000 at 0xa threshold
• n+n 1.8.L spectra - attachment 1
• p+n 1.8.L spectra attachment 2

p+n peak widths

n+n peak widths

Daily checks

• Fee temperatures ok - attachment 3
• Bias and leakage currents ok - attachment 4
• Stats spectra with current grounding - attachment 5
  • Current grounding is just a cable going between each adaptor board and its respective FEE
  • Interfee grounding done by power supply and also pulser circuit
• Rates for each of the asics - attachment 6
• p+n waveforms - attachment 7
• n+n waveforms - attachment 8
  • Lots of noise evident on them

Plans for the day

• Connect FEEs up to the copper earth bars installed
• Powercycle and check noise levels
• If n+n remains significantly higher investigate the n+n pulser circuit further
• Investigate the effects of different jumper connetions At present n+n have all LK jumpers on and p+n have lk2-4