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Plasma Panel Sensor UM/TAU/IS/ORNL meeting with GE
Yiftah Silver Tel Aviv University
September 27th 2012
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The university, people and the laboratory Response to radiation
• Long exposure to the source• Spatial resolution position scan
Proton Test beam• The facility and set-up• Results
Summary
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Outline
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Largest university in Israel ~20 Experimental HEP faculty
members taking part at (partial list):• CERN: ATLAS at the LHC• DESY:ZEUS• Fermilab: SELEX • ILC / CLIC• Jefferson Lab• SLAC: BaBarat
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Tel-Aviv University
The Tel-Aviv University PPS team
Professor Erez Etzion Dr. Yan Ben-Hammou Meny Ben-Moshe Nir Guttman Yiftah Silver
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Tel Aviv HEP laboratory•15 years of detectors R&D for High energy physics and the LHC•Development and testing of the TGCs for the ATLAS experiment •Development of the STGC for the ATLAS upgrade
The lab is currently under construction, moving into a bigger room to better accommodate the test-bench, gas system, electronics etc.
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• Long duration exposure to Ru106 source The source is placed over the same area in the panel for 14
hours Signals induced in the panel are counted
• Spatial resolution position scan Moving the Ru106 source in 1mm steps above the panel In each position the source is left for a 5 minute measurement From this measurement we can also see the pixels’ uniformity.
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Response to radiation
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Experiment setup
Each RO line is X100 Attenuated
Micrometer translation precision of collimated source
Discriminator
10 Read Out lines
VME V560counter
Panel fill: CF4 gas, 600 Torr
Rquench=20MΩ
Rout
HV supply
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Source position
Source sits here
1cm thick, Delrin collimator, with a 3 mm slit opening
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Long exposure to Ru-106 source
Collimated Ru106 source placed above channel 7 for 14 hours
Minimal spreading to pixels far away from the source
Elapsed time
[min]
10
One full turn moves the source by 1mm 16 measurements 5minutes each and 1mm
apart.
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Position scan
Illustration picture
119/7/2011TAU - status report
49mm
50mm
51mm
52mm
53mm
54mm
55mm
56mm
60mm
59mm
58mm
57mm
cpm
Channel
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Source position measurement
Gaussian fit results graph X-axis relative distance to the first position The electrode pitch in this panel (10 electrodes per inch)
is the slope of this line: 0.4 electrodes per mm…
Strip number vs. Micrometer position
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Panel uniformity
Each point is the total hit rate in the panel per minute Vs. the position of the source
Both source and collimator aperture size are larger than the electrode pitch
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Beam experiment was held at the ProCure facility in Illinois March 2012
IBA cyclotron accelerate protons to energies ranging from 70 to 250 MeV
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IBA Proton beamProton beam tunnel
Cyclotron
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Before the setup of the PPS test bench
Inside the patient room a computer controlled, robotic table with an XYZ translation system (six degrees of freedom) with a 0.1mm accuracy
A set of perpendicular lasers are being used in the room to show the position of the beam’s center path
A closer look at the proton delivery system
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The facility
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Set up The panel was filled with 99% Ar and 1% CO2 at 600 Torr. 11 HV channels with 860 Volt each, separately quenched with a 200
resistor 17 channels read out with ATLAS modified MDT DAQ (Robert Ball’s
presentation) Trigger is the logical OR between all RO channels
M
The panel
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The beam The estimated beam current is about 1 nA with beam energy 226.09
MeV, Gaussian distributed with 0.5 cm width This correspond to proton rate larger than 1 GHz on the entire spread of
the beam (13.3 cm) The actual rate of protons from a 1mm hole in the center of the beam
was measured to be about 2 MHz
The panel
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Position scan
Two position scans • 1cm steps - using a brass collimator with a 1cm diameter hole placed
2.5 cm away from the beam center• 1mm steps with 1 mm diameter hole directly in the center of the
beam The table (the panel) is translated up-down by 1 cm (mm) between
measurements, beam position is fixed
The panel
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1cm scan
Number of hits per channel
Reconstructed centeroid of the hit map Vs. the PDP relative displacement respect to the initialposition
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1mm scan
Number of hits per channel
Reconstructed centeroid of the hit map Vs. the PDP relative displacement respect to the panel’s initialposition.
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Measurements at UM, TAU and at a test beam shows that the panel’s granularity can be exploited in order to detect stream of particles with sub-millimeter separation
The single channel response, up to the intrinsic (geometrical) limits of this device is demonstrated
At the proton test beam the panel successfully detect the position of a 1mm beam with very high intensity (~1MHz)
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Summary