IceCube PMTs Pre-Shipping Calibration (FY2004)

• Gain-HV scan and the charge resolution by taking SPE charge histogram.
• Noise Rate with 0.25 SPE threshold at gain of 5x10^7
• HWHM of SPE pulse waveform by taking waveform data.
• After-pulse
• 2D uniformity scan (at room temperature)
• QE scan (a part of the tubes we receive)

• Presentation of Master thesis by K.F
• Master thesis by K.F

• July 2004 Batch
• August 2004 Batch
• September 2004 Batch
• October 2004 Batch
• November 2004 Batch
• December 2004 Batch
• January 2005 Batch

• Subpulses after SPE pulse

• Presentation by HAMAMATSU co.ltd in the meeting in June 6 Powerpoint 372 kbyte

  setup for the charge spectrum calibration

  
  

  

  setup for taking the WaveForm data

  
  

  

  setup for the Noise Rate measurement

  
  

  

  Gate of Noise Rate is variable time scale.
  

• Mesurement Result preliminary since 10/2004(Chiba univ. vs Hamamatsu)

  This "HV vs HV" figure is comparison mesurement Chiba univ and Hamamastu at 5*10E07 Gain

  

  
  

  This "HV vs HV" figure is comparison mesurement Chiba univ and Hamamastu at 1*10E07 Gain

  
  

  

  
  
  
• Mesurement Result preliminary since 7/2004(Charge Resolution, Peak to Valley Ratio, NoiseRate)

  Charge resolution distribution

  

  
  

  Peak to Valley Ratio distribution

  

  
  

  Noise Rate distribution