Detector software

Abstract for a contribution to the SFAIR/SKF meeting in Stockholm, Sweden. The talk is intended to be held during the SFAIR part of the meeting, which will take place October 18th - 20th. The submission deadline for the abstract is October 8th. As for the general topic of this talk, I will focus on the tracking concepts and developments we are pursuing in the Uppsala group. For more details, please refer to the attached document.

Reworked rules 2017/06

Talk given at FAIR@Teheran workshop (BFC delegation to Iran).

Abstract and Poster for the ACAT 2017 conference is attached as .pdf

update: Current Version of the proceeding is now included

A key aspect of the PANDA experiment at the future FAIR facility is the production and spectroscopy of ΛΛ hypernuclei. The double hypernuclei are produced in a two-stage target system consisting of a primary in-beam filament to produce low momentum Ξ− hyperons which are stopped and converted into two Λ hyperons in a secondary external target.

A system of piezo motors will be used to steer the primary target in two dimensions. This allows to achieve a constant luminosity by adjusting the position and provides the replacement of eventually broken target wires.

The poster shows the first prototype mounted with vacuum-capable motors. The optical wire-based sensor in development for position control is presented. Motion and position control is managed using the EPICS framework.

The construction of large scale high energy physics experiments present many
exciting challenges in various fields. One crucial task the development of technology
has to handle is the immense amount of data generated by detectors in accelerator
experiments. This paper deals with the upcoming PANDA experiment currently
in construction in Darmstadt, Germany, which is expected to generate data at a
rate of 200 GB/s. The size of the data stream has to be significantly reduced
by a triggering system, which filters the data before storage. Triggering systems
have traditionally been implemented in hardware, by tuning the detectors to only
collect data for short time windows when signals are registered. However, due to
the high technical demands, the PANDA experiment will use an entirely software-
based trigger. The filtering will be performed using algorithms to reconstruct physical
observables from the raw data which are then used to select the interesting data
segments for storage.
This paper describes the implementation of a prototype for real-time software
triggering for a subdetector of the PANDA experiment. The prototype is highly
scalable and implemented with the use of the MPI and OpenMP frameworks. In addition, new algorithms for early event reconstruction based on raw data are
presented.

The PANDA experiment at the international accelerator Facility for Antiproton and Ion Research in Europe (FAIR) near GSI, Darmstadt, Germany will address fundamental questions of hadron physics.
Excellent Particle Identification (PID) over a large range of solid angles and particle momenta will be essential to meet the objectives of the rich physics program.
Charged PID for the barrel region of the PANDA target spectrometer will be provided by a DIRC (Detection of Internally Reflected Cherenkov light) detector.

The PANDA Barrel DIRC will cover the polar angle range of 22-140 degrees and separate charged pions from kaons for momenta between 0.5 GeV/c and 3.5 GeV/c with a separation power of at least 3 standard deviations. The design is based on the successful BABAR DIRC and the SuperB FDIRC R&D with several important improvements to optimize the performance for PANDA, such as a focusing lens system, fast timing, a compact fused silica prism as expansion region, and lifetime-enhanced Microchannel-Plate PMTs for photon detection.
We will discuss the baseline design of the PANDA Barrel DIRC, based on narrow bars made of synthetic fused silica and a complex multi-layer spherical lens system, and the potentially cost-saving design option using wide fused silica plates, and present the result of tests of a large system prototype with a mixed hadron beam at CERN.

The high precision experiment PANDA is specifically designed to shed
new light on the structure and properties of hadrons. PANDA is a fixed
target antiproton proton experiment and will be part of Facility for
Antiproton and Ion Research (FAIR) in Darmstadt, Germany. When
measuring the total cross sections or determining the properties of
intermediate states very precisely e.g. via the energy scan method, the
precise determination of the luminosity is mandatory.
For this purpose, the PANDA luminosity detector will measure the
2D angular distribution of the elastically scattered antiproton trajectories.
For the determination of the luminosity the parametrization of
the differential cross section in dependence on the scattering angle is
fitted to the measured angular distribution. The fit function is highly
complex as it is not only able to corrected for the detection efficiency
and resolution, but also the antiproton beam shift, spotsize, tilt and
divergence. As most of these parameters are extracted from the fit,
this method is extremely powerful as it delivers also beam properties.
This poster will cover the complete luminosity determination procedure,
which is capable of extracting the luminosity with an accuracy
in the permille level.