Yiftah Silver Tel Aviv University September 27 th 2012.

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]

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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