PID Cherenkov Session at CM 21/1

PID-Cherenkov subgroup meeting, Tuesday, 9th March, 14:00h

Ilknur Koeseoglu & Lisa Brueck, Giessen, The updates on the EDD project

Tests with the recent TOFPET-ASIC which works with positive and
negative signals were performed. The EDD radiator equipped with
liquid cooled read-out modules was setup in the Giessen Cosmic
Station (GCS) and the Cherenkov pattern measured. The cooling was done
with heat pipes. Simulation of the cooling was validated with
measurements and the help of a heat camera.

Simon Bodenschatz, Giessen, GCS Status Update - Simulations and
Measurements

Simon gave an update on the status of the GCS. The light tightness was
improved by a housing for the MCP-PMTs and a box for the radiator.
The simulation of the radiator is done in Geant4. Internal reflection
photons are not yet realistic, eg. with a reflection probability.

Georg Schepers, GSI, Status of the Q&A-measurement of the Nikon radiators at GSI

The radiator bars from Nikon were delivered (98+14) to GSI. All bars meet
fabrication specs, and Georg is now performing detailed QA in the GSI DIRC lab.
He improved the measuring quality of the internal reflection probability by
searching the maximum light intensity over the photo diode which has an
inhomogeneous spatial sensitivity. He observes a shift of the internally reflected
laser beam when scanning the radiator bar. The amount of the shift does not
affect the performance of the DIRC. Five Nikon bars are to be measured
for the later use in the pollution setup.

Katja Gumbert, Erlangen, Properties of the MCP-PMTs for the Endcap Disc Dirc

Results of measurement for 3x100 pixel tubes from Photonis were shown which are intended
to be used in the Endcap Disk DIRC. The ES440 showed a drop in QE simply by aging
on the shelf. The gain of these 10um channel plates if sufficient for the use in PANDA.

Daniel Miehling, Erlangen, Update on Lifetime Measurements and short look on CE measurement setup

Best sensor the Photonis 90011393 is at 29 C/cm² (almost 60 years of PANDA lifetime :) ) 
without any sign of cathode damage. The Photek sensors already show aging effects, no matter if
the side was illuminated or covered or the sensor even was off (< 1C/cm2). They probably
suffer from micro-leaks.