Speaker
Mr
Gergo Hamar
(Wigner RCP, Budapest)
Description
Novel Cherenkov detector upgrades favour GEM and Thick-GEM based
MPGD systems. These detectors have reduced ion backflow, fast signal formation, high gain, and could suppress the MIP signals as well. Their common drawbacks are the inefficiencies of photo-electron collection from the top of the TGEM and the local variation of multiplication due to the special geometry.
The developed high resolution scanner[1] using a focused UV light gave the possibility to study single photo-electron response of MPGDs in the submilimeter scale. Revealing the microstructure of photo-efficiency and local gain provides a new tool to quantitatively compare different TGEM geomertries and field-configurations, and thus optimize the detector parameters.
The presentaion will focus on the key elemets of the scanning system; and on the microstructure evolution of different Thick-GEM configuraions.
[1]: Nucl.Instr.Meth.A 694 (2012) 16
Primary author
Mr
Gergo Hamar
(Wigner RCP, Budapest)