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<font color="#000099"><b><font color="#3333ff">Physics Seminar<br>
Friday, Oct. 14, 2011<br>
1:30PM<br>
Room F224/225<br>
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Cookies & Coffee at 1:15<br>
<br>
</font></b></font><b><font color="#cc0000">Thomas K Hemmick
<br>
Stony Brook University</font><br>
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"New Technologies for Cherenkov Light Detection"</font>
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With each new generation of detectors, experimental physics becomes
<br>
more ambitious. This includes low mass and high precision tracking
<br>
techniques as well as advanced methods of particle identification
<br>
pushing the lab momentum threshold ever higher. Cherenkov light, and
<br>
particularly ring imaging of that light provides exquisite precision
<br>
in particle velocity for high momentum PID. Advancing the boundary of
<br>
high momentum particle ID requires harvesting sufficient light from
<br>
low index radiators and is frequently hampered by cost-driven space
<br>
limitations on the radiator gas length. A novel approach was
<br>
successfully demonstrated in the PHENIX "Hadron-Blind Detector" using
<br>
CsI photocathodes directly evaporated upon Au-coated GEM foils. This
<br>
techniques was shown to yield 22 photo-electrons from only 50 cm of
<br>
CF4 gas (n=1.00062). The technology of the existing HBD and new
<br>
research directions driven by requirements of a future Electron-Ion
<br>
Collider will be discussed.
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Thomas K Hemmick
<br>
Stony Brook University
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