measurements with micromegas detector prototypes for the atlas myon system anna ravensburg and...
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Measurements with Micromegas Detector Prototypes for the Atlas
Myon System
Anna Ravensburg and Pascal GrobeckerCERN Internship 08.04. – 19.04.2013
http://www.atlas.ch/photos/muons-tgc.html
Micromegas
2
The ATLAS - Detector
3
*http://core.physicsinfo.co.uk/filestore/104/atlas.jpg
Task: To build Myon-Detectors (blue) which work fasterTime: About 5 years
Setup of a Particle Detector
4+
-+
Argon
Electric Field Particle
-+
-
Avalanche-Effect
5+
-+
Argon
Electric Field Particle
-+
-
- +
Micro-Mesh Gaseous Detector
6
Changed from http://en.wikipedia.org/wiki/File:MMPrincipe.png
Problems at ATLAS with Micromegas
7
Dust between Mesh and Strips
8
Changed from http://en.wikipedia.org/wiki/File:MMPrincipe.png
Irragularities of the Electric Field
9
Our tasks
10
Building a Micromegas Detector
11
Gas in
Gas out
Preamplifier
Fe55
Building a Setup for Measurements
Oscilloscope
To Power Supply
To Amplifier
12
Building a Setup for Measurements
A Strips: +534VB Drift: -300V
13
Our Measurements
14
Our Measurements
36 86 136 186 2360
50
100
150
200
250
300
350
400
450
500
Channel
Num
ber o
f inc
iden
ces
15
Fe55: radioactive source
6 keV
Ar: Excitation
Peakpositiony x 1 2 3 4 5
1 129 153 169 175 1502 144 159 169 172 1563 154 168 167 170 1644 168 176 168 171 1565 165 171 168 164 150
Deviation from averagey x 1 2 3 4 5
1 20.49% 5.70% 4.17% 7.86% 7.54%2 11.24% 2.00% 4.17% 6.02% 3.85%3 5.08% 3.55% 2.93% 4.78% 1.08%4 3.55% 8.48% 3.55% 5.40% 3.85%5 1.70% 5.40% 3.55% 1.08% 7.54%
16
Building a Micromegas Detector
17
Gas in
Gas out
Preamplifier
Fe55
Full Width at Half Maximum (FWHM)y x 1 2 3 4 5
1 64 42 46 48 482 57 40 43 45 583 62 44 48 46 524 59 45 47 49 555 65 51 44 48 55
1836 86 136 186 2360
50
100
150
200
250
300
350
400
450
500
Channel
Num
ber o
f inc
iden
ces
Half MaximumFWHM
Gain Curve
19
460 470 480 490 500 510 520 530 54010
15
20
25
30
35
40
45
50
55
Voltage
Peak
posi
tion
Measurement of cosmic radiation
20
Setup
21
Scintillators
Lead
Micro-megas
Our Measurements
22Fit Panel
ConsoleData of a Micro-megas detector with fitting line
Comparision of different Detectors
23
Conclusion
24
Thank you for giving us the chance to come to CERN and have 12 great days! 25
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