Adamczewski-Musch, J.

Linev, S.

Ovcharenko, E.

Ugur, C.

GSI Repository

GSITemplate2007 HADES trbnet data formats for DABC and Go4 J. Adamczewski-Musch1,  S. Linev1, E.Ovcharenko2, and C.Ugur1 1Common Systems/Electronics, GSI, Darmstadt, Germany, 2ITEP, Moscow, RussiaIntroduction The hadaq data format via the trbnet transport protocol is used for many years to take data of the HADES exper-iment. The new TRB3 generation of read-out hardware is investigated for application with several FAIR experi-ments, e.g. PANDA and CBM. To support such develop-ments, plug-in software has been implemented for the data acquisition framework DABC and the online/offline analysis framework Go4.  Plug-in for DABC The hadaq plug-in defines an additional software li-brary with the DABC framework. It provides classes to receive trbnet packets from the front-end boards via mul-tiple UDP/Ethernet data streams and to align different message streams with respect to the “readout id” of the central trigger system (CTS). The resulting events may be stored in the standard HADES list mode data (hld) for-mat. This re-implements the basic functionality of the current HADES production event builder software (Fig.1). The existing HADES event builder control sys-tem may even control the DABC event builders, since the export of the required parameters via shared memory to EPICS is completely emulated here.  A special DABC software module (“MbsTransmitter”) allows wrapping the original hadaq data format into ge-neric data packets of the MBS framework. As a conse-quence, data from trbnet frontends can be combined with data from other sources with MBS-type format by means of the generic MBS combiner module of DABC. Addi-tionally, the trbnet data can be stored in MBS listmode (lmd) format or can be delivered to online monitoring clients like Go4 via standard MBS streamserver or event-server protocols. As the hadaq plug-in can read hld files, also a conversion between hld and lmd files is possible.  Implementations for Go4 Generic unpacker code for trbnet data has been imple-mented as Go4 “processor” class. This expects the hadaq events to be wrapped into MBS event containers, as it is delivered by the DABC hadaq plug-in. Besides a special Go4 “user event source” class allows to read data directly from hld files and to wrap them into MBS containers as input for the processor. So the Go4 online analysis can either directly connect to the DABC application for quali-ty monitoring or it can replay recorded data both from hld or lmd formatted list-mode files.  On top of this generic scheme, dedicated analysis codes for the TRB3 FPGA-TDC frontends [1] have been im-plemented in Go4. They can evaluate the TDC frontend format with up to 65 channels of time stamped messages. Each hit message contains a coarse time and a fine time counter value and leading/trailing edge property. A cali-bration procedure for the fine time counters allows cor-recting FPGA variations to improve individual channel resolution to 10 ps. An absolute timestamp range of 45 minutes is achieved by evaluating intermediate “epoch counter” messages. The time difference of each hit against a reference channel can be used in Go4 for hit selection with a time cut.   Figure 1: DABC components configured for HADES event building: Combined data channels can be saved as hld or lmd files. Go4 online monitoring may connect to MBS streamserver socket. The existing HADES event-builder control system with EPICS is fully supported.  Applications At a test beam of CBM detector prototypes at CERN PS in November 2012, the DABC hadaq plug-in per-formed self triggered data readout from parts of the CBM-RICH prototype. The TRB3-TDC analysis had been inte-grated to the Go4 based CBM test beam framework [2] and was here running in the online monitoring.  A first version of the Go4 hadaq analysis was used for test beams of PANDA-DIRC collaboration at MAMI fa-cility in February 2012. Most recent tests at COSY facili-ty did benefit from applying the CBM improved analysis.  References [1] C. Ugur, W Koenig, J. Michel, M. Palka, and M.  Traxler, “Field Programmable Gate Array Based Data Digitisation with Commercial Elements”,  TWEPP-12, Oxford, September 2012, (JINST, ac-cepted for publication) [2] J. Adamczewski-Musch, N. Kurz, S. Linev, and P. Zumbruch, “Data acquisition and online monitor-ing software for CBM test beams”, CHEP 2012, NY, May 2012 (J. Phys.: Conf. Ser. 396 01 2001) GSI SCIENTIFIC REPORT 2012 PHN-SIS18-ACC-41FAIR@GSI 297

HADES trbnet data formats for DABC and Go4

http://repository.gsi.de/record/52192/files/PHN-SIS18-ACC-41.pdf

HADES trbnet data formats for DABC and Go4

Abstract

Similar works

Full text

Available Versions

GSI Repository