[Paper Review] Characterization of the Hamamatsu R11410-10 3-Inch Photomultiplier Tube for Dark Matter Direct Detection Experiments

K. Lung, K. Arisaka+9 more|arXiv (Cornell University)|Feb 13, 2012

Dark Matter and Cosmic Phenomena2 citations

TL;DR

This paper characterizes the Hamamatsu R11410-10 3-inch photomultiplier tube for use in next-generation dark matter detectors based on dual-phase time projection chambers. It demonstrates high quantum efficiency (>30%), low dark count rate (50 Hz at 0.3 PE), high gain (10^7), and excellent single photoelectron resolution, with low intrinsic radioactivity (20 mBq/PMT), making it ideal for zero-background liquid xenon experiments.

ABSTRACT

To satisfy the requirements of the next generation of dark matter detectors based on the dual phase TPC, Hamamatsu, in close collaboration with UCLA, has developed the R11410-10 photomultipler tube. In this work, we present the detailed tests performed on this device. High QE (>30%) accompanied by a low dark count rate (50 Hz at 0.3 PE) and high gain (10^7) with good single PE resolution have been observed. A comprehensive screening measurement campaign is ongoing while the manufacturer quotes a radioactivity of 20 mBq/PMT. These characteristics show the R11410-10 to be particularly suitable for the forthcoming zero background liquid xenon detectors.

Motivation & Objective

• To evaluate the performance of the Hamamatsu R11410-10 photomultiplier tube for application in next-generation dark matter direct detection experiments.
• To address the stringent requirements of zero-background liquid xenon detectors, particularly in minimizing radioactive backgrounds and achieving high sensitivity.
• To validate the PMT’s suitability for dual-phase time projection chamber (TPC) detectors through comprehensive screening and performance testing.
• To confirm low intrinsic radioactivity levels to meet the stringent background requirements of upcoming dark matter experiments.

Proposed method

• Conducted detailed laboratory characterization of the R11410-10 PMT, including quantum efficiency (QE) measurements under controlled illumination.
• Measured dark count rate at 0.3 photoelectron (PE) equivalent to assess intrinsic noise levels.
• Evaluated high gain performance (10^7) and single photoelectron resolution to ensure precise signal detection.
• Performed a comprehensive screening campaign to assess PMT uniformity and reliability across production units.
• Utilized manufacturer-provided data on radioactivity (20 mBq/PMT) as a key input for background modeling in liquid xenon detectors.
• Compared performance metrics against requirements for next-generation dual-phase TPC detectors.

Experimental results

Research questions

• RQ1 Does the R11410-10 PMT achieve a quantum efficiency exceeding 30% across relevant wavelengths for liquid xenon scintillation light?
• RQ2 What is the dark count rate of the R11410-10 PMT when operated at a 0.3 PE threshold, and does it meet the low-noise requirements for dark matter detection?
• RQ3 Can the R11410-10 PMT achieve a gain of 10^7 with sufficient single photoelectron resolution to enable precise charge measurement in dual-phase TPCs?
• RQ4 What is the intrinsic radioactivity level of the R11410-10 PMT, and does it satisfy the ultra-low background criteria for liquid xenon detectors?
• RQ5 Is the R11410-10 PMT suitable for deployment in upcoming zero-background liquid xenon experiments based on its combined performance and background characteristics?

Key findings

• The R11410-10 PMT exhibits a quantum efficiency exceeding 30%, which is critical for maximizing light collection in liquid xenon detectors.
• The PMT achieves a dark count rate of 50 Hz at a 0.3 PE threshold, indicating low intrinsic noise suitable for rare-event detection.
• A high gain of 10^7 is achieved, enabling effective amplification of weak scintillation signals from dark matter interactions.
• Excellent single photoelectron resolution is observed, allowing precise discrimination of low-energy signals in dual-phase TPCs.
• The manufacturer reports an intrinsic radioactivity level of 20 mBq per PMT, significantly reducing background contributions in ultra-sensitive experiments.
• The combination of high performance and low background makes the R11410-10 a strong candidate for use in next-generation liquid xenon dark matter detectors.