Difference between revisions of "Collimation System"
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| + | Figure 1. Images of the GlueX active collimator during assembly. There are 4 identical inner wedges and another set of 4 identical outer ones. The rows of pins on the inner radius of each wedge are critical to their performance as a local photon flux monitor. | ||
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Revision as of 14:00, 27 October 2014
The GlueX active collimator consists of 8 separate tungsten wedges placed symmetrically in two concentric rings around a 5-mm diameter clearance hole. It can be placed over any primary collimator aperture that is 5mm in diameter or smaller, and provide 8 independent signals which come into balance when the photon beam spot is properly centered on the collimator aperture. The wedges are mounted as shown inside a cylinder made of boron nitride, a white soft ceramic material that is an excellent insulator as well as being machinable and mechanically robust. The placement of the wedges on the boron nitride substrate are shown below.
Figure 1. Images of the GlueX active collimator during assembly. There are 4 identical inner wedges and another set of 4 identical outer ones. The rows of pins on the inner radius of each wedge are critical to their performance as a local photon flux monitor.
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