Operation of the NuMI beam monitoring system Page: 3 of 8
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js5 'FIGURE 2. Exterior photograph of the rear of the Hadron Monitor. Shown are the 98 feedthroughs
for the high voltage and signal channels. Also visible are the hard-line cables designed to survive the
radiation environment.
The Hadron Monitor
The Hadron Monitor is a 7 x 7 array of pixels, separated by 4.5" center-to center,
for a total array area of about 1 m2. The pixels are housed within a monolithic gas
vessel that is installed as a single unit. Ceramic feedthroughs are used for all electrical
connections through the vessel wall. The chamber plates are mounted directly on the
feedthroughs to minimize internal electrical connections.
Custom hardline cable brings the electrical connections across the body of the
Hadron Monitor to each of its feedthroughs (shown in Fig. 2). These cables lie in the
beam, so they are subject to radiation damage and possible signal pickup. To guard
against both, the cables are designed with both polyimide and ceramic insulators about
the conductor, with the whole shielded by aluminum tubing.
To allow possible replacement, the Hadron Monitor was designed to limit
radioactivation. Aluminum was used instead of steel wherever possible, and only the
minimum amount of material as necessary was used.
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Zwaska, Robert M.; Indurthy, Dharma; Keisler, Ryan; Kopp, Sacha; Mendoza, Steven; Pavlovich, Zarko et al. Operation of the NuMI beam monitoring system, article, June 1, 2006; Batavia, Illinois. (https://digital.library.unt.edu/ark:/67531/metadc884334/m1/3/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.