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The Hawaii Muon Beamline.

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Title:The Hawaii Muon Beamline.
Authors:Bynes, James L., III
Contributors:Electrical Engineering (department)
Date Issued:Dec 2017
Publisher:University of Hawaiʻi at Mānoa
Abstract:High Energy Physics (HEP) instrumentation development programs often require extensive tests
of experimental equipment such as silicon pixel detectors, single photon sensitive detectors for
Cherenkov radiation, particle time of
ight systems, etc. These tests are usually conducted at
accelerator research facilities where available beam-time is not only limited, but also expensive.
The Hawaii Muon Beamline (HMB) will use cosmic-ray generated muons to enable performance
evaluations of such devices under test. HMB is a beam telescope constructed out of four posi-
tion sensitive tracking detectors and a calorimeter system for measurement redundancy. Position
tracking detectors are built using an array of geiger-mode avalanche photodiodes, also known as
Multi-pixel Photon Counter (MPPCs), coupled to square Polyvinyl Toluene (PVT) scintillator
blocks. The MPPCs are positioned orthogonally along the block edges. Charged particles traveling
through a scintillation block emit detectable amounts of light. The analog output pulses from the
MPPCs trigger the TARGETX waveform digitizing ASIC which samples at 1 Giga Sample per
second (GSPS). From the pulse amplitudes, being proportional to the amount of light, the charged
particle penetration position can be estimated in a 2D plane. To construct the HMB, each pair of
tracking detectors need to be placed vertically, one on top of the other, providing the entrance and
exit position of the beam. In between both pairs, space is made available for a device under test.
In addition, a separate calorimeter system composed of four rectangular blocks of Sodium Iodide
(NaI) crystals coupled to photomultiplier tubes (PMT) is placed below and o -axis of the lower pair
tracking system. This calorimeter system is used to measure the deposited energy of the particle
exiting the system and to veto shower events. HMB enables to handle sub-nanosecond timing of
signals, and its digital processing core is implemented on an FPGA, which instructs a PC to read
out from each detector subsystem via Gigabit Ethernet. The collected data allow post-processing
algorithms to determine the precise trajectory of the passing particle, hence enables the use of
this information to categorize the device under test. This document focuses on the construction of
HMB. It describes in detail its electronic readout system and presents some initial results.
Description:M.S. Thesis. University of Hawaiʻi at Mānoa 2017.
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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