Abstract
Micro-channel plate (MCP)-based photodetectors are capable of picosecond level time resolution and sub-mm level position resolution, which makes them a perfect candidate for the next generation large area photodetectors. The large-area picosecond photodetector (LAPPD) collaboration is developing new techniques for making large-area photodetectors based on new MCP fabrication and functionalization methods. A small single tube processing system (SmSTPS) was constructed at Argonne National Laboratory (ANL) for developing scalable, cost-effective, glass-body, 6 cm×6 cm, picosecond photodetectors based on MCPs functionalized by Atomic Layer Deposition (ALD). Recently, a number of fully processed and hermitically sealed prototypes made of MCPs with 20 μm pores have been fabricated. This is a significant milestone for the LAPPD project. These prototypes were characterized with a pulsed laser test facility. Without optimization, the prototypes have shown excellent results: the time resolution is ∼57 ps for single photoelectron mode and ∼15 ps for multi-photoelectron mode; the best position resolution is ≤0.8 mm for large pulses. In this paper, the tube processing system, the detector assembly, experimental setup, data analysis and the key performance will be presented.
Original language | English |
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Pages (from-to) | 84-93 |
Number of pages | 10 |
Journal | Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment |
Volume | 804 |
DOIs | |
State | Published - Dec 21 2015 |
Externally published | Yes |
Funding
We would like to thank Ronald Kmak (ANL) for the design of the vacuum chamber. We also thank Joe Gregar (ANL) of the Argonne glass shop, for his talent work on the frit seal. We are deeply grateful to Matthew Wetstein (University of Chicago) and Bernhard Adams (ANL) for their advice on detector testing. Work at ANL was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences and Office of High Energy Physics under contract DE-AC02-06CH11357 . Use of the Center for Nanoscale Materials was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences , under Contract no. DE-AC02-06CH11357 .
Keywords
- MCP-PMT
- Micro-channel plate
- Photodetector
- Position resolution
- Single photoelectron
- Time resolution