1. MPGD 2015
Concise Summary
Amos Breskin

2. Grazie SILVIA & her local TEAM ! + all committee members !

3. “cooking” for us a variety of “TASTY MPGD TOYS”
Grazie CHEF RUI !
“cooking” for us a variety of “TASTY MPGD TOYS”

4. RD51 The prime roles of our community:
Study basic detector physics (theory, experiment)
Conceive new detector concepts (& readout)
Build detector systems for experiments (“the real life”)
Educate the younger generation
Disseminate new detector technologies
Gas-avalanche Detectors:
A fascinating, ever-growing field
With many multidisciplinary applications
Far behind Particle Physics!

5. OLD GOOD WIRE CHAMBERS - GAIN RESOLUTION
CHARPAK 1968
cathode
anode wires
ATLAS 2015
~50 years…
1924 – 2010 e-
ion
1992
WIRE CHAMBERS
Gain ~ 104
Resolution ~ 100mm
Timing ~ 10s-100s ns
Rate ~ 104 Hz/mm2
Thin-Gap wire Chambers (TGC)
being upgraded for sLHC…
Status: 50mm resolution

6. Leading MICRO-PATTERN GAS DETECTORS
Oed 1988
Sauli 1997
Giomataris 1998
MICRO-STRIP CHAMBER
MSGC
GAS ELECTRON MULTIPLIER
(GEM)
MICROMEGAS
DRIFT ELECTRODE
Resolution:
Few 10s mm
ANODE STRIP
CATHODE STRIPS
<100 mm
140 mm
Drift + thin multiplication-strips
on insulator
MICRO-PIXEL
THGEM
2004
Resolution:
Few 100s mm

7. Usual “Problems”
Discharge limits (dynamic range)  resistive electrodes
Ion backflow blocking (TPC, RICH)  cascades, staggered holes, graphene coatings
Photon feedback (noble gases)  cascades, staggered holes
Resolutions (physical limits, readout)
Rate capability (space charge, charge removal)
Large-area detectors (production; industrialization)
Readout electronics

8. Position resolutions needed: 10s microns - to - centimeters!
Applications
Tracking in HEP
TPC
Calorimetry (DHCAL)
Single-photon (UV, visible) imaging (RICH)
Neutron & x-ray imaging
Cryogenic T (UV detectors, electron detectors)
Nuclear Physics
Homeland security
etc
50mm
Position resolutions needed:
10s microns - to - centimeters!

9. A 2-THGEM and MicroMegas GPM with position sensitive pad readout
2-THGEM with RPWELL with position sensitive pad readout
A triple THGEM GPM with position sensitive pad readout

10. Summary of summary… Molto-Interesting Conference
Good variety of talks, posters & reviews
Focused on HEP…though many other fascinating applications!
I limited myself to some of the topics presented and discussed others I find important
sLHC & (may be) ILC are still far - but B-factories, Nucl.Phys., RHI, SR, neutron sources, space & ground astro-activities, medical etc – are good “customers”!
Room for good R&D for training and motivating the younger generation!
Amos Breskin – Vienna 2010

11. BRESSLER

12. Gaseous Photo-Multipliers (GPMs) for future dark matter searches
ERDAL
GPMs
WIS R&D on GPMs for future multi-ton LXe TPCs for dark matter searches (within DARWIN)
Aim for 4π coverage – not practical with PMTs (cost, bulkiness) or SiPMs (dark count rate)
Successful demonstration of 4” cryogenic triple-THGEM GPM with reflective CsI coupled to dual phase LXe TPC:  (arXiv: )
- Stable gain ~ 105
Large dynamic range: 1 – O(103) photoelectrons
1 ns timing (~ 200 PEs)
Expected PDE ~15% after optimization
4” triple-THGEM GPM
Also: on-going R&D on n/γ imaging with pixilated readout (arXiv: )
CsI coated

13. Graphene: opaque to ions and
transparent to electrons
Graphene on GEM

14. Alexeev JINST2013