Low Gain Avalanche Detector (LGAD) technology has been used to design and construct prototypes of time-zero detector for experiments utilizing proton and pion beams with High Acceptance Di-Electron ...Spectrometer (HADES) at GSI Darmstadt, Germany. LGAD properties have been studied with proton beams at the COoler SYnchrotron facility in Jülich, Germany. We have demonstrated that systems based on a prototype LGAD operated at room temperature and equipped with leading-edge discriminators reach a time precision below 50 ps. The application in the HADES, experimental conditions, as well as the test results obtained with proton beams are presented.
The Data Acquisition Backbone Core (DABC) is a software framework for distributed data acquisition. In 2013 Version 2 of DABC has been released with several improvements. For monitoring and control, ...an HTTP web server and a proprietary command channel socket have been provided. Web browser GUIs have been implemented for configuration and control of DABC and MBS DAQ nodes via such HTTP server. Several specific plug-ins, for example interfacing PEXOR KINPEX optical readout PCIe boards, or HADES trbnet input and hld file output, have been further developed. In 2014, DABC v2 was applied for production data taking of the HADES collaboration's pion beam time at GSI. It fully replaced the functionality of the previous event builder software and added new features concerning online monitoring.
Online Object Monitoring With Go4 V4.4 Adamczewski-Musch, J.; Essel, H. G.; Linev, S.
IEEE transactions on nuclear science,
2011-Aug., 2011-08-00, 20110801, Volume:
58, Issue:
4
Journal Article
Peer reviewed
Full data analysis is often necessary for monitoring complex nuclear and atomic physics experiments. This analysis program should run continuously getting data directly from the data acquisition to ...provide information with low latency. Several visualization and control clients, typically graphical user inter faces (GUI), should be able to inspect the results from the analysis, mostly histograms, but also other objects like parameters. It should be possible for the clients to get updates of selected data continuously without blocking user actions. The Go4 analysis framework developed at GSI provides this functionality. A Go4 analysis program may run in a server mode under control of a non-blocking GUI. Analysis and GUI run in separate tasks, optionally on different nodes. In dedicated threads they can send/receive objects asynchronously via TCP connections. Additional distributed viewers (GUIs) may connect to the same analysis. The Go4 framework is based on the analysis package ROOT developed at CERN. Data channels to the experiment specific data acquisition are implemented as data source classes (plug-ins). The GUI is implemented using the cross-platform GUI framework Qt, version 4, embedding the full ROOT graphics. User written GUIs can be attached. ROOT macros can be executed in the analysis or GUI context, respectively. Complex fits can be performed interactively by a powerful fit package. Go4 v4 runs on Linux, Solaris, Windows (XP, 7) and MacOS. Cross platform connections between G04 environments are possible. Go4 runs in production for several years mainly in the nuclear and atomic physics fields.
TRD detector development for the CBM experiment Petriş, M.; Petrovici, M.; Cătănescu, V. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
12/2013, Volume:
732
Journal Article
Peer reviewed
A transition radiation detector (TRD) prototype based on a single multiwire proportional chamber coupled with a small drift region was developed for the innermost part of the CBM-TRD subsystem. It ...preserves the same gas thickness for transition radiation absorption as the double-sided TRD prototype for which a pion misidentification probability of better than 1% for a six layer configuration was obtained. In the same time it fulfills the requirement of a high geometrical efficiency of CBM-TRD stations. The readout electrode geometry with triangular shaped pads gives access to a two-dimensional position information with a single TRD layer. The detector was tested with a mixed electron/pion beam of 1–5GeV/c momentum at the CERN PS accelerator. A pion misidentification probability of 1.18% for a six layer configuration based on this architecture was obtained. The two-dimensional position resolutions (along and across the pads) were measured. The pad signals were processed using a new front-end electronics called Fast Analog Signal Processor (FASP), designed for high-counting-rate environments. CADENCE simulations were used for further optimization of the FASP amplifier for operating this new architecture.
The Compressed Baryonic Matter (CBM) experiment is intended to run at the FAIR facility that is currently being built at GSI in Darmstadt, Germany. For testing of future CBM detector and read-out ...electronics prototypes, several test beam campaigns have been performed at different locations, such as GSI, COSY, and CERN PS. The DAQ software has to treat various data inputs: standard VME modules on the MBS system, and different kinds of FPGA boards, read via USB, Ethernet, or optical links. The Data Acquisition Backbone Core framework (DABC) is able to combine such different data sources with event-builder processes running on regular Linux PCs. DABC can also retrieve the instrumental set-up data from EPICS slow control systems and insert it into the event data stream for later analysis. Vice versa, the DIM based DABC control protocol has been integrated to the general CBM EPICS IOC by means of an EPICS-DIM interface. Hence the DAQ can be monitored and steered with a CSS based operator GUI. The CBM online monitoring analysis is based on the GSI Go4 framework which can directly connect to DABC online data via sockets, or process stored data from list-mode files. A Go4 sub-framework has been implemented to provide possibility of parallel development of analysis code for different sub-detectors groups. This allows divide the Go4 components up into independent software packages that can run either standalone, or together at the beam-time in a full set-up.
Two-dimensional position sensitive transition radiation detector Petriş, M.; Petrovici, M.; Cătănescu, V. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
06/2013, Volume:
714
Journal Article
Peer reviewed
A new transition radiation detector (TRD) prototype foreseen to fulfill the requirements of the TRD subdetector of the CBM experiment at FAIR has been designed, constructed and tested with electrons ...and pions of a few GeV/c. The detector prototype was build with the original TRD architecture which preserves the high conversion efficiency of transition radiation in a single TRD layer. This TRD architecture is based on two multiwire proportional chambers readout by a common double-sided pad read-out electrode. The triangular shape of the readout pads gives access to the position information in both coordinates which defines the readout electrode plane. Pion efficiency as a function of number of TRD layers and position resolution were studied using electron and pion beams delivered by PS at CERN. Dedicated front-end electronics, designed for high counting rate environment was used. An extrapolated pion efficiency of 0.5% for a six layer TRD configuration at 90% electron efficiency using a regular foil radiator was obtained. The position resolution across the pads is of the order of 320μm and along the pads of 5.5mm.
► Two-dimensional position sensitive TRD. ► Highly efficient dedicated front-end electronics. ► Very good pion rejection of ∼200 for six TRD layers.
Dataflow Engine in DAQ Backbone DABC Adamczewski-Musch, J; Essel, H G; Kurz, N ...
IEEE transactions on nuclear science,
2010-April, 2010-04-00, 20100401, Volume:
57, Issue:
2
Journal Article
Peer reviewed
New experiments at FAIR require new concepts of data acquisition systems. So rather than building hardware trigger configurations with strict latency limitations, self-triggered electronic systems ...will be utilized. Their front-end components will be time synchronized and will provide data furnished with time stamps. Data streams from a multitude of such components will be forwarded via a powerful sorting network to an event building farm. The Data Acquisition Backbone Core (DABC) is designed as a general purpose software framework for the implementation of such data acquisition systems. It is written in C++. Recently, we made its first version available. In this paper we describe the mechanisms of the data flow engine of DABC.
The HADES spectrometer currently operating on the beam of SIS18 accelerator in GSI will be moved to a new position in the CBM cave of the future FAIR complex. Electromagnetic calorimeter (ECAL) will ...enable the HADES@FAIR experiment to measure data on neutral meson production in heavy ion collisions at the energy range of 2-10 A GeVon the beam of the new accelerator SIS100. Calorimeter will be based on 978 massive lead glass modules read out by photomultipliers and a novel front-end electronics. Secondary gamma beam with energies ranging from 81 MeV up to 1399 MeV from MAMI-C Mainz facility was used to verify selected technical solutions. Relative energy resolution was measured using modules with three different types of photomultipliers. Two types of developed front-end electronics as well as energy leakage between neighbouring modules under parallel and declined gamma beams were studied in detail.
Data Acquisition Backbone Core DABC Adamczewski, J.; Essel, H.G.; Kurz, N. ...
IEEE transactions on nuclear science,
02/2008, Volume:
55, Issue:
1
Journal Article
Peer reviewed
For the new experiments at FAIR new concepts of data acquisition systems have to be developed like the distribution of self-triggered, time stamped data streams over high performance networks for ...event building. The Data Acquisition Backbone Core (DABC) is a software package designed for FAIR detector tests, readout components test, and data flow investigations. All kinds of data channels (front-end systems) are connected by program plug-ins into functional components of DABC like data input, combiner, scheduler, event builder, analysis and storage components. After detailed simulations real tests of event building over a switched network (InfiniBand clusters with up to 23 nodes) have been performed. With the DABC software more than 900 MByte/s input and output per node can be achieved meeting the most demanding requirements. The software is ready for the implementation of various test beds needed for the final design of data acquisition systems at FAIR.
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