IceCube PMTs Pre-Shipping Calibration (FY2004)

IceCube/ PMTs / PMTs Screening

PMT Pre-Shipping Calibration @ -32C (FY2004)

Following items are planned to be measured in the pre-shipping Freezer measurement in 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)

Approximately 10 % of the ordered tubes (12 or 10 tubes / month) will be shipped to Chiba, measured, and shipped back to Hamamatsu.

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