Large Area Picosecond Photodetector (LAPPD ${}^{\mathrm{TM}}$ ) - Pilot production and development status

Journal Article · Fri Dec 07 00:00:00 EST 2018 · Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment

DOI:https://doi.org/10.1016/j.nima.2018.11.137· OSTI ID:1564252

Minot, M. J. ^[1]; Adams, B. W. ^[1]; Aviles, M. ^[1]; Bond, J. L. ^[1]; Cremer, T. ^[1]; Foley, M. R. ^[1]; Lyashenko, A. ^[1]; Popecki, M. A. ^[1]; Stochaj, M. E. ^[1]; Worstell, W. A. ^[1]; Wetstein, M. J. ^[2]; Elam, J. W. ^[3]; Mane, A. U. ^[3]; Siegmund, O. H. W. ^[4]; Ertley, C. ^[4]; Frisch, H. J. ^[5]; Elagin, A. ^[5]; Angelico, E. ^[5]; Spieglan, E. ^[5]

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1. Incom, Inc, Charlton, MA (United States)
2. Iowa State Univ., Ames, IA (United States)
3. Argonne National Lab. (ANL), Lemont, IL (United States)
4. Univ. of California, Berkeley, CA (United States)
5. Univ. of Chicago, IL (United States)

Here, we discuss performance results achieved for fully functional sealed Large Area Picosecond Photodetectors (LAPPD (TM)) in tests performed at Incom Inc., as well as independent test results reported by our early adopters. The LAPPD is a microchannel plate (MCP) based large area picosecond photodetector, capable of imaging with single-photon sensitivity at high spatial and temporal resolutions in a hermetic package. The LAPPD has an active area of 350 square centimeters in an all-glass hermetic package with a fused silica window and bottom plate and sidewalls made of borosilicate float glass. Signals are generated by a bi-alkali Na₂KSb photocathode and amplified with a stacked chevron pair of MCPs produced by applying resistive and emissive atomic layer deposition coatings to glass capillary array (GCA) substrates. Signals are collected on RF stripline anodes applied to the bottom plates which exit the detector via pin-free hermetic seals under the side walls. LAPPD test and performance results for product produced and delivered to early adopter customers during the first half of 2018 are reviewed. These results include electron gains ≥ 7.5 x 10⁶ @ 850/950 V (entry/exit MCP), low dark noise rates (22 Cts/s/cm²), single photoelectron (PE) timing resolution of 64 picoseconds RMS, and single photoelectron spatial resolution along and across strips of 2.8 mm and 1.3 mm RMS respectively. Many of these devices also had very high QE photocathodes that were uniform over the full 195 mm x 195 mm window active area (LAPPD #15 QE% @ 365 nm Max/Avg/Min = 25.8/22.3 ± 3/15.7). An update is additionally provided of developments that enable capacitive signal coupling from the detector to application specific pads or stripline readout patterns deployed on printed circuit boards positioned beneath the file, outside of the vacuum package. We conclude with examples of how sensors offering picosecond timing, in diverse applications can bring transformative change to detector technology and applications in future experiments.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP); USDOE Office of Science (SC), Nuclear Physics (NP); USDOE Office of Science (SC), Basic Energy Sciences (BES)
• Grant/Contract Number: AC02-06CH11357; SC0011262; SC0009717; SC0015267
• OSTI ID: 1564252
• Alternate ID(s): OSTI ID: 1636291
• Journal Information: Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 936, Issue C; ISSN 0168-9002
• Publisher: Elsevier
• Country of Publication: United States
• Language: English

Related Subjects

47 OTHER INSTRUMENTATION
LAPPD
Large area photodetector
Picosecond timing
ALD MCP
Microchannel plate
Photon counting