IEEE 2011 NSS-MIC Valencia Yiftah Silver October 26 th 2011.

Development of a Plasma Panel Radiation Detector:

Recent Progress and Key Issues

IEEE 2011 NSS-MIC Valencia

Yiftah SilverOctober 26th 2011

Yiftah Silver, Tel-Aviv University 2

Tel Aviv University, Department of Physics• Yan Benhammou, Meny

Ben Moshe, Erez Etzion, Yiftah Silver

University of Michigan, Department of Physics• Dan Levin, Claudio

Ferretti, J. Chapman, CurtisWeaverdyck, Robert Ball

Integrated Sensors, LLC.• P. S. Friedman

Oak Ridge National Laboratory• Robert Varner

10/26/2011

Plasma Panel Sensor (PPS) collaboration

3Yiftah Silver, Tel-Aviv University

Widely used, commercial product• Invented in 1964• 107-108 units manufactured 2010• ~$0.20 / sq inch with electronics• ~100,000 hour lifetime

10/26/2011

Plasma Display Panel (PDP)

matrix configuration coplanar configuration

2 main technologies


Hermetically sealed volume no gas flow Targeted cell size of about 50-200 µm excellent spatial

resolution. Scalable panel size up to meter size with thickness 0.3 - 5

cm Fast cell response rise-time ~1 ns

10/26/2011

Plasma Panel Sensor (PPS) aims to inherit PDP features

Investigate plasma panels for inexpensive, large area arrays of micro-Geiger cells for

detection of MIPs and heavily ionizing particles : gas mixture, pressure, pulse

shape…

We are trying to use plasma TV’s as radiation detectors


Test Chamber (coplanar configuration)• Surface discharge electrode studies• Gas mixture, pressure studies

Commercial PDP (matrix configuration)• Starting with commercial DC-PDP

Gas mixtures, pressure and Electric field Pulse timing – rise time, recovery time Pulse spreading

• Simulations (both test chamber and commercial PDP) COMSOL: electric field and charge motion

electric field and charge motion Estimate capacitance of cells

SPICE: Electrical characteristics of PPS signal

10/26/2011

Current progress in Plasma Panel Sensor investigation

Yiftah Silver, Tel-Aviv University 610/26/2011

Prototype PPS coplanar electrodes configuration

Electrode layout with lateral discharge gap

e-ion+


Prototype PPS test chamber

motorized Z-stage to vary drift gap

Testing glass PPS substrates Staging Vacuum-Pressure

Chamber Integrated four component gas

mixing system

First measurements with the prototype PPS test chamber have recently

commenced


Commercial monochromatic PDP study

dielectric

+ + + + + + +

- --Discharge gap

glass

Ni anode 800 m

glass

340 m

SnO2 cathodes

Columnar discharge• Pixels at intersections of

orthogonal electrode array Measurements of background

signal and response to a radioactive sources with different gases

Cosmic ray Muons detection

Simulated E-field in the PDP pixel

5 mm

0

-5 mm E-field is localizedNo E-field

e-

10/26/2011Yiftah Silver, Tel-Aviv University 9

Simulated β spectrum in panel

HVSnO2

Ni

2D readout is possible (both sense lines and HV)

Discriminator and counter

Measurements Setup (I) radioactive source response

DAQ includes:4 channels 5 GHz digitizer

Collimated 90Sr source is placed above the active area of the panel

KeV

During discharge cell becomes conductive, Voltage drops E field drops discharge self-terminates Simplified model of a capacitor discharge yield a very similar signal. (in most of

the tested conditions) A more elaborate Spice model incorporates stray capacitance and inductances


Real VS. simulated signals

Signal from panelSimulated results

nsec

nsec

100

100


Collimated 90Sr source 20cm above the panel over different parts of the active

area – 4X4 pixel array

Each bin shows the hit rate on one pixel - background subtracted

PDP 2D ReadOut

12

34

12

34

12

34

12

34


Measurements Setup (II) – Cosmic ray muons

PMT1PMT2

Both pure CF4 and SF6 gases shows a signal with a very fast response time.

Arrival time is defined with respect to the hodoscope trigger


Cosmic ray muon detection

Pure SF6200 Torr1530 Volt

14

With pure CF4 gas We have a discharge plateau with low background…

10/26/2011Yiftah Silver, Tel-Aviv University

Final voltage scan with cosmic ray muons

plateau

1780 1790 1800 1810 1820 1830 1840 1850 1860 18700

2

4

6

8

10

12

14

16

Voltage [Volt]

PP

S/T

RIG

GER

[%

]


About 8% of all triggers were associated with signal from the panel

In order to increase the geometrical acceptance we are investigating PDPs with higher resolutions i.e. smaller pixels and smaller distances between pixels with different discharge gaps

10/26/2011

Cosmic ray muons

Pixel active area ~1.3mm2 total active area: ~20mm2

Hodoscope triggering area ~250mm2 Geometric acceptance for muons ~10% When taking into account the geometric

acceptance, pixel efficiency for muon detection is in order of 80%-90%!


The detection of cosmic muons with an off-the-shelf generic PDP is established.

Prof of concept measurements have been made with different gasses: Xe, Ar, CF4, SF6, Ar-CO2, Ar-CF4 in various mixtures.

Various operating voltages and pressures are investigated

Discharge pulses: Have large amplitude - no need for amplification

electronics Uniform (for each gas) Leading edge rise time of few ns Observed pulses associated to single pixels (~1mm2)

with minimal discharge spreading between pixels

10/26/2011

Conclusions


Further explore the parameters (gas content, pressure, voltage, discharge gap etc.) for optimized detector operation

Improve ReadOut electronics Increase the number of pixels in the panel’s

active area Efficiency measurements in a muon test beam

10/26/2011

Future plans


Thank you…

Any questions?


Backup


discharge cell: important gas processesprimary ionizati

on

metastable

generation

Excitation Penning ionizati

on Image from: Flat Panel Displays and CRTs (Chapter 10) L. Tannas, Jr,

photon emission

Metastable

ejection

ion ejected electron

10/26/2011


Streamer formation


Signal from 4 pixels

RO 27(I) 26(II)

RO 29(I) 27(II)

HV 95(I) 94(II)

HV 93(I+II)

All the signals from all the measurements look the same!

26

27

28

29

30

HV

93 95

IEEE 2011 NSS-MIC Valencia Yiftah Silver October 26 th 2011.

Documents

Transcript of IEEE 2011 NSS-MIC Valencia Yiftah Silver October 26 th 2011.