PANDA FRICH status, Sergey Kononov, BINP
The FRRC funding finished in 2017, small NSU funding stopped in 2020,
therefore, there is no active work on FRICH TDR. Other FARICH R&D connected
to the Super Charm-Tau factory is ongoing. Sergey showed some results about
a neural network approach for reconstruction. He also showed a
FEE for the FARICH with SiPM, cooled down to -40 degree Celsius.
The Giessen Cosmic Station Status Update, Simon Bodenschatz, JLU-Giessen
Measurements with the prototype radiator were done in a light tight
box within the GCS. The single photon resolution is estimated to be around
10 mrad. The trigger efficiency is about 2300 events in half an hour.
There is a problem with condensation at the cooled parts of the detector not
present in the later PANDA setup.
The EDD electronics update, Ilknur Koeseoglu, JLU-Giessen
Ilknur showed the historical development of the TOFPET ASIC
which meanwhile can measure positive and negative signals and the development
of the customized FPGA and ASIC boards. Latter boards arrived 2 weeks ago and
she showed the plans for testing them.
The Custom PCB cooling system for Magnet Box design,
Lisa Brueck, JLU-Giessen
The magnet box for testing magnetic fields effects on the FEE-PCBs serves also
for liquid cooling studies. The requirement is a target temperature of
18-20 degree with an heat generation of ~40 Watts. The measured temperatures
are in good agreement with simulations.
The magnetic field measurements for FEE, Leonard Welde, JLU-Giessen
The study of the magnetic fields in the magnetic box between two layers of
permanent magnets show a maximum attainable field of 0.26 Tesla at a distance
of 60 mm between the plates. Larger distances yield lower fields and better
field homogeneity.
Update on the quality of radiation bars, Georg Schepers, GSI
Georg gave a short oral report about activities and improvements of the
quality assessment of the radiator bars, all already delivered to GSI.
Update on MCP-PMT production and further plans, Jochen Schwiening, GSI
Also a short oral report about the status of MCP-ordering from PHOTONIS.
Update on 3x100 MCP-PMTs, Katja Jumbert, FAU-Erlangen
Katja presented results on the PHOTONIS-MCPs with a 3x100 strip arrangement
of the type xxP541 and ES440. The formerly observed drop of QE
of 943P541 and 946P541 without illumination has stopped. The timing precision
for those tubes was in the order of 30 ps (RMS ~100 ps), the after pulse
probability .09% per pixel. A recently received 105P541 shows good QE but has
problems with the anode current at high gain or illumination. This needs
further studies.
Results of the B-field measurements, Steffen Krauss, FAU-Erlangen
Steffen showed results from the study of two MCP-PMTs, one a PHOTEK A1200116,
the other one a PHOTONIS 9002192. The PHOTEK showed 42 ps (200 ps RMS) timing
precision without magnetic field and 59 ps (200 ps RMS) precision in a
field of 1 Tesla. The PHOTONIS tube showed a similar behavior. The charge
sharing between pixels decreases with the increase in the magnetic field.
Update on Lifetime Measurements, CE and rate stability with TRB system,
Daniel Miehling, FAU-Erlangen
Most sensors with ALD coating have lifetime > 5C/cm2. He showed
collection efficiencies which show different values when measured at different
times. The extraction of this quantity uses a fit of the
measured charge spectrum which had an issue. This is meanwhile solved.
Measuring the rate stability of sensors offered a surprise when looking
to areas with differing QE (one half already aged, the other not). The sides
with the higher QE show a better rate stability. There is already a little model
to describe this effect.
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