Commercial and Cost Effective Production of Two-Dimensional Read-Out Boards for Sub-Atomic Particle Detectors Page: 4 of 17
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coordinates is uniform across the readout board ( 10% is typically adequate). Thus, both the
magnitude of the charge sharing ratio and its uniformity across a board are of interest.
The work plan was to produce boards of two different geometries: a multi-plane variant (Figure
5), and a single plane variant (Figure 10). The multi-plane version had varying strip width and
strip pitch across the board, yielding a gradient of trace widths and pitches. The single plane
board had pads and strips of fixed dimension and pitch across the board.
After the initial production run was verified, the readout boards were sent to Yale, where they
were incorporated into an existing GEM setup and tested, and will see interaction with an
existing GEM foil setup. From these experiments, data was obtained and analyzed and the
second production run was configured
The second run of readout boards concentrated primarily on reproducibility. Using the analysis
from the first part of Phase I, multiple iterations, in fewer numbers than before, were produced.
These boards were sent to the collaborating institutions, tested, and analyzed.
The second set of readout boards, which will be much fewer in quantity, will directly lead to the
future production of a final readout board, as we feel that the knowledge gained from the two
initial production runs will allow us to gain a reliable understanding of the manufacturing
process and enable us to demonstrate reproducibility of the results. The Phase I Task Schedule
is outlined in Table 1 below.
All aspects of the work plan were completed during the Phase I time period.
1.1 Technical Objectives
The specific goal of Phase I is to produce a series of readout boards that meet or exceed the
performance required for use in a GEM tracking detector. Mutli-plane and single plane boards
with a variety of parameters will be evaluated for performance in GEM chambers, uniformity of
physical parameters, ease of manufacture and reproducibility. The boards will be evaluated with
optical measurements and operated in a GEM chamber to assess the uniformity and resolution.
Also, the calculations used to estimate charge sharing will be vetted or tuned so as to provide a
useful tool for understanding new layouts. Detailed measurements will be carried out by the
research collaborators. BNL, MIT and Yale have significant experience in operating and
characterizing the performance of GEM chambers using a variety of measurements with
radioactive sources, X-ray machinesgenerators, cosmic rays and test beams. Also the
collaborators can perform physical measurements with a variety of instruments including an d
OGP coordinate measuring machine. The goal of Phase I is to understand the advantages and
limitations of single plane and multi-plane boards produced with precision etching, and to
develop the techniques that will later be used in production of the resulting readout structures.
1.2 Technical Objective 1. Produce and evaluate a variety of Bi-planar Boards.
Tech-Etch initially produced 3 bi-planar boards using the etched polyimide technique. These
boards have fixed strip width and pitch (700 pm / 800 pm) on the bottom layer and 16
combinations of width and pitch on the top layer. Figure 3 illustrates the layout and details are in
Table 1 (All Tables are located in Appendix A).
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Crary, David & Majka, Richard. Commercial and Cost Effective Production of Two-Dimensional Read-Out Boards for Sub-Atomic Particle Detectors, report, October 22, 2010; United States. (digital.library.unt.edu/ark:/67531/metadc835497/m1/4/: accessed November 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.