A Cryocompatible Scintillating Fiber Tracker

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Tags: cryocompatible | fiber | scintillating | tracker | voltmeter

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Title: A Cryocompatible Scintillating Fiber Tracker

1
A Cryo-compatible Scintillating Fiber Tracker

2
Contents

3
Questions

4
Proposal

Build a prototype tracker here at Fermilab after
the questions about specification have been
answered.
We have the facilities
Machining
Cryogenic systems
Test beam and sources
DAQ systems
We have the people
Technicians
Mechanical engineers
Electrical engineers
Experimental physicists

5
Proposal

Make a tracker that works well in room
temperature.
Fully characterize the FT performance with cosmic
muons, test beam and sources. (This may mean
building more than one tracker.)
Figure out how to (adiabatically?) bring down the
temperature of the trackers environment without
damage.
Constant tensioning/insulation
Photodetector location
Figure out how to bring the light out of the
cryogenic vessel if photodetecors are outside
vessel
Compatibility of photodetector type with the
cryogenic environment
Long-term issues

6
Show-and-tell A quick test
7
Show-and-tell A quick test

Test module consists of 100 1mm scintillating
fibers encapsulated at both ends within lucite
rods. The ends are polished.
One end of the test module was coupled to a PMT.
The base output was connected to a high impedance
volt meter.
Liquid nitrogen was poured into a cylinder to
immerse about ½ of the light-tightened module.
A ? source was aimed at the lower end of the test
module during the pouring process.
Source-on and source off voltages were factor of
4.
No significant change in output was observed for
a few minutes until the black tape wrapping
cracked, producing massive light leaks.