fast timing in cosmic rays simon swordy - november 18th
Post on 19-Dec-2015
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Fast Timing in Cosmic Rays
Simon Swordy - November 18th
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Above the atmosphere
• mass identification
• trigger and charge measurement
• calorimeter albedo rejection
Ground based
• dual focus imaging systems
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Mass id science
• Be9/Be10 - age of cosmic rays should show time dilation effects which map out the density of material traveled versus time. Need lorentz factors above ~2.
• He3/4 - material traveled as a function of lorentz factor -> required to find source energy spectra of He
• antiprotons - what do these do at high energy?
• anti-deuterium - is there any of this?
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~3m
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What is the maximum detectable for a TOF system with resolution t and a separation of 3m?
t(ps) max
100 7.1
30 12.9
10 22.4
3 40.3
• probably interesting for Be9/10 and anti-deuterium
• not much good for He3/4 (need 100 or so)
• works in a region where there are no good cherenkov radiators (n>1.01 n<1.1)
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Calorimeter albedoproblem
CREAM-2004
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albedo time ~several ns
pixel detectors would be muchbetter than paddles because oftransit time in paddles
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Dual focal length cerenkov imaging
Primary, spherical1m dia, 4m focal
Detector,26x26cm1600 pixels
Fresnel lens1m focal
3m
1m
~ 18ns delay between images
- TrICE (Track Imaging Cherenkov Experiment)
U. Chicago - ANL
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0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.50
1.5
3
4.5
6
7.5
9
10.5
12
13.5
15
Emission Angle (deg)
Tim
e D
elay
(ns)
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.50
1.5
3
4.5
6
7.5
9
10.5
12
13.5
15
Emission Angle (deg)
Tim
e D
elay
(ns)
Size of Direct Cherenkovspot -> nucleus Z
• Dual focal length system• 1st image wide angle includes shower-trigger• 2nd image higher resolution finds direct Cherenkov component -> ns resolution would be useful here
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HOW MUCH?
For a NASA experiment on balloons 1 detector plane of 1mx1m could beup to $250k -> $25 per cm2
For an imaging cherenkov camera 0.6m x 0.6m could be $300k -> $80 per cm2
Probably needs to get below $100 per cm2 to be a contender.........