Submitted by g.schepers on Thu, 04/04/2019 - 16:18.
The Barrel DIRC of the PANDA experiment at FAIR will cleanly
separate pions from kaons for the physics program of PANDA. Innovative solutions
for key components of the detector sitting in the strong magnetic eld of the compact
PANDA target spectrometer as well as two reconstruction methods were developed
in an extensive prototype program. The technical design and present results from
the test beam campaigns at the CERN PS in 2017 and 2018 are discussed.
The PANDA experiment at the future Facility for Antiproton and Ion Research (FAIR) will address
fundamental questions of hadron physics with unprecedented precision.
To reach this goal excellent Particle Identification (PID) is essential over a large range of particle momenta and solid angles.
Most of the phase space will be covered by two innovative DIRC (Detection of Internally Reflected Cherenkov light) detectors.
The Endcap Disc DIRC and Barrel DIRC will cover the polar angle range from 5 to 22$^\circ$ and 22 to 140$^\circ$, respectively.
Both detectors rely on high precision optical components, lifetime-enhanced Microchannel Plate PMTs (MCP-PMTs), and fast readout electronics.
The DIRC detectors of the PANDA experiment at FAIR will use multi-anode MCP-PMTs as photon sensors. After long and extensive R&D work
the performance parameters of the recent 2'' MCP-PMT models are converging towards the required values. The lifetime of most ALD-coated
MCP-PMTs is well surpassing the DIRC requirements with the best tube currently reaching >22 C/cm2 without aging. The performance of the most advanced MCP-PMTs from PHOTONIS and Hamamatsu fulfill basically all requirements with a highlight being the high DQE of almost 30% for the PHOTONIS 9002108. The improvements of the latest MCP-PMT models compared to former tubes are emphasized in this paper. In addition, some performance features of a recently developed 2'' MCP-PMT by Photek Ltd are presented and discussed.
The future PANDA experiment with a next generation detector will focus on hadron
spectroscopy. It will use cooled anti-proton beams
with a momentum between 1.5 GeV/c and 15 GeV/c
interacting with various targets. This allows to direct
form all states of all quantum numbers and measure
there widths with an accuracy of a few tens of keV
The experiment will be located at the Facility for
Anti-Proton and Ion Research in Germany, which is currently under construction.
The electromagnetic target calorimeter of the PANDA experiment has the challenging aim to
detect high energy photons with excellent energy resolution over the full dynamic range from
15 GeV down to a few tens of MeV inside a 2T solenoid. To reach this goal, improved
PbWO 4 scintillator crystals (PWO-II) cooled down to −25°C have been chosen. They provide
a fast decay time for highest count rates, short radiation length for compactness, improved
light yield for lowest thresholds and excellent radiation hardness. The target calorimeter itself
is divided into a barrel shaped structure and two endcaps. Individual crystals will be read out
with two precisely matched large area avalanche photo diodes. In the very inner part of the
forward endcap, vacuum phototetrodes will be used instead.
The talk will give an overview of the PANDA experiment and focuses on its calorimeter
including the scintillator material and the production status. Furthermore, the construction and
assembly procedure will be presented.
This work was upported by the BMBF.