A setup for the precision measurement of multianode photomultiplier efficiency

TL;DR

This paper introduces an experimental setup for precisely measuring the efficiency of multianode photomultiplier tubes, crucial for applications like cosmic ray detection, achieving a few percent uncertainty through calibration with a NIST photodiode.

Contribution

The paper presents a novel calibration method for multianode photomultiplier efficiency using NIST standards, applicable to various photodetectors with high precision.

Findings

Achieved efficiency measurement uncertainty of a few percent.

Demonstrated calibration technique on multianode photomultiplier tubes.

Validated method with example results for cosmic ray detection applications.

Abstract

In many applications, such as the detection of ultra-high energy cosmic rays using the air fluorescence method, the number of photons incident on the detector must be known. This requires a precise knowledge of the absolute efficiency of the photodetectors used. We present an experimental setup for measuring the single photoelectron gain and efficiency of multi-anode photomultipliers with a total uncertainty on the order of a few percent. This precision is obtained by using a comparison to a NIST calibrated photodiode, and the presented method can be applied to both vacuum photomultiplier tubes and other photodetectors. This work is motivated by the need to calibrate the focal surface of the EUSO-Balloon instrument, which is a technical pathfinder for the future JEM-EUSO mission. A complete discussion of photomultiplier calibration is presented and the efficiency measurement technique is discussed in detail. Example results are given to illustrate the key points of the method.