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Enhanced Scintillating Tracker for Evaluating the 2nd Generation Borehole Muon Detector at the Hawaii Muon Beamline.

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Title:Enhanced Scintillating Tracker for Evaluating the 2nd Generation Borehole Muon Detector at the Hawaii Muon Beamline.
Authors:Le, Khanh P.
Contributors:Electrical Engineering (department)
Date Issued:May 2018
Publisher:University of Hawaiʻi at Mānoa
Abstract:Muon tomography generates three-dimensional volume images from measuring the
ux and
angular distribution of cosmic ray muons [1]. When comparing the imaging capability to X-rays,
muons can penetrate much thicker materials. The muons ability to penetrate deep into materials,
like rock and metal, makes muon detectors ideal for subsurface geological feature reconstruction. In
the past, muon detectors have been used by Luis Alvarez in an attempt to discover hidden chambers
in the Second Pyramid of Chep-hren in Giza and successfully image the displacement of magma in
active volcanoes [2{4]. In the early days of muon tomography, detectors were very large and had
very low resolution. Early detectors used large drift tubes and Photo-Multiplier Tubes to measure
ux attenuation. With advancements in readout electronics and Silicon Photo Multipliers,
modern detectors are much smaller in size, have higher resolution, and come at a lower cost.
The Borehole Muon Detector (BMD) project intends to greatly reduce the size, power expendi-
ture, and operational cost of current muon detection technology [5]. Muon detection starts when a
muon passes through the detector's scintillating planes, exciting scintillating materials, and result-
ing in a
ash of light. The
ash of light, consisting of only a few dozen photons, is then measured
in units of photoelectrons, is then converted to an electrical pulse by photosensors and saved in the
TARGETX ASIC. Information from the TARGETX is read out using a Spartan 6 FPGA and sent
back to the PC via standard ber optic Ethernet link for analysis and reconstruction. When fully
realized, the BMD will be approximately 1 m long with a diameter of 15.24 cm (6 in). The full
detector encloses all readout electronics, scintillating planes, and an integrated Thermo-Electric
Cooler. The design is intended for deployment in subsurface boreholes with diameters greater than
17.78 cm (7 in), up to a depth of 914 m (3000 ft) [5], and has the capability to collect data for long
periods of time.
This document focuses on the design of the 2nd generation center daughter cards, development of
the readout rmware and software, and construction of the tracker planes to be used in the Hawai'i
Muon Beamline. The initial results from calibration, pedestal subtraction, sine wave reconstruction,
LED pulsar test, and RC gain circuit evaluation of the 2nd generation BMD center daughter cards
are also included.
Description:M.S. Thesis. University of Hawaiʻi at Mānoa 2018.
Rights:All UHM dissertations and theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission from the copyright owner.
Appears in Collections: M.S. - Electrical Engineering

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