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Proceedings Paper

Development of a large area microstructure photomultiplier assembly (LAMPA)
Author(s): E. T. H. Clifford; M. Dick; M. Facina; D. Wakeford; H. R. Andrews; H. Ing; D. Best; M. J. Baginski
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Paper Abstract

Large area (> m2) position-sensitive readout of scintillators is important for passive/active gamma and neutron imaging for counter-terrorism applications. The goal of the LAMPA project is to provide a novel, affordable, large-area photodetector (8” x 8”) by replacing the conventional dynodes of photomultiplier tubes (PMTs) with electron multiplier microstructure boards (MSBs) that can be produced using industrial manufacturing techniques. The square, planar format of the LAMPA assemblies enables tiling of multiple units to support large area applications. The LAMPA performance objectives include comparable gain, noise, timing, and energy resolution relative to conventional PMTs, as well as spatial resolution in the few mm range. The current LAMPA prototype is a stack of 8” x 8” MSBs made commercially by chemical etching of a molybdenum substrate and coated with hydrogen-terminated boron-doped diamond for high secondary emission yield (SEY). The layers of MSBs are electrically isolated using ceramic standoffs. Field-shaping grids are located between adjacent boards to achieve good transmission of electrons from one board to the next. The spacing between layers and the design of the microstructure pattern and grids were guided by simulations performed using an electro-optics code. A position sensitive anode board at the back of the stack of MSBs provides 2-D readout. This presentation discusses the trade studies performed in the design of the MSBs, the measurements of SEY from various electro-emissive materials, the electro-optics simulations conducted, the design of the 2-D readout, and the mechanical aspects of the LAMPA design, in order to achieve a gain of > 104 in an 8-stage stack of MSBs, suitable for use with various scintillators when coupled to an appropriate photocathode.

Paper Details

Date Published: 3 May 2017
PDF: 11 pages
Proc. SPIE 10183, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XVIII, 101830K (3 May 2017); doi: 10.1117/12.2261696
Show Author Affiliations
E. T. H. Clifford, Bubble Technology Industries, Inc. (Canada)
M. Dick, Bubble Technology Industries, Inc. (Canada)
M. Facina, Bubble Technology Industries, Inc. (Canada)
D. Wakeford, Bubble Technology Industries, Inc. (Canada)
H. R. Andrews, Bubble Technology Industries, Inc. (Canada)
H. Ing, Bubble Technology Industries, Inc. (Canada)
D. Best, SCI Technology, Inc. (United States)
M. J. Baginski, SCI Technology, Inc. (United States)

Published in SPIE Proceedings Vol. 10183:
Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XVIII
Augustus Way Fountain III; Jason A. Guicheteau, Editor(s)

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