PhotoMultiplierTubes are light amplification devices.

# Models

## XP2020

Datasheet
https://my.et-enterprises.com/pdf/XP2020.pdf
Sensitivity
https://plot.ly/~brookst/2/xp2020-sensitivity/
51 mm / 2" diameter. Typical sensitive range: 270 to 650 nm. Used in East Area CherenkovCounters.

## XP2020Q

Datasheet
http://www2.fisica.unlp.edu.ar/blogs/tgc/XP2020Q-1.pdf
Sensitivity
https://plot.ly/~brookst/0/xp2020q-sensitivity/
51 mm / 2" diameter, UV-sensitive. Typical sensitive range: 150 to 650 nm.

## 9813KB

Datasheet
https://my.et-enterprises.com/pdf/9813B.pdf
51 mm / 2" diameter. Typical sensitive range: 290 to 630 nm. Used in ScintilatorCounters.

# Quantum Efficiency

PhotoMultiplierTube sensitivity is often expressed as Radiant Sensitivity (). The quantum efficiency is given by

where is the elementary charge and is the photon energy. Like , is a function of wavelength.

# Resources

Hamamatsu PMT Basics and Applications
https://www.hamamatsu.com/resources/pdf/etd/PMT_handbook_v3aE.pdf#page=43
Chapter 4
https://www.hamamatsu.com/resources/pdf/etd/PMT_handbook_v3aE-Chapter4.pdf

-- TimBrooks - 2015-12-11

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Topic revision: r3 - 2016-02-12 - TimBrooks

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