\includegraphics[width=\textwidth]{gfx/trb3/cts-web}\\
(b)
\end{minipage}
- \caption{(a) The TRB3 without any mezzanine cards. (b) Screenshot
+ \caption{(a) The TRB3 without any mezzanine cards. (b) Screen shot
showing the Central Trigger System web interface.}
\label{fig:trb3}
\end{figure}
Any user can profit from several common software developments for this
platform concerning data acquisition and analysis. The well
-established HADES eventbuilder software \cite{michel-twepp2011} can be
+established HADES event-builder software \cite{michel-twepp2011} can be
applied to acquire the data delivered by the front-ends and save them
to HLD formatted files. The stored TDC data stream can be subsequently
analysed offline by a ``standalone'' unpacker code
\cite{unpacker-web}, solely based on the ROOT software package. This
includes well-tested methods for calibration of the delay lines.
-DABC \cite{dabc-pub,dabc-web} and Go4 \cite{go4-web} software provide
-an alternative way to readout and analyse data from the TRB3. DABC can
-be used like the standard HADAQ software for acquiring and storing
-data in HLD files. However, at the same time, DABC can deliver data to
-a running Go4 analysis via a TCP/IP socket connection. As the main
-advantage of such a approach, many detector and electronics tests can
-be performed without writing files to disk and showing results
-immediately on the display. Moreover, a standard web browser can be
-used for live monitoring of DABC and Go4.
+The data acquisition and analysis framework DABC \cite{dabc-web} and
+Go4 \cite{go4-web} provide an alternative way to readout and analyse
+data from the TRB3 \cite{dabc-pub}. DABC can be used like the standard
+HADAQ software for acquiring and storing data in HLD files.
+Additionally, DABC can deliver data at the same time to a running Go4
+analysis via a TCP/IP socket connection. The main advantage of such
+technique is that many detector and electronics tests can be performed
+without writing files to disk, just showing results immediately on the
+Go4 display. Moreover, a standard web browser can be used for live
+monitoring of DABC and Go4.
Depending of experimental needs, a Go4-based analysis provides
-different methods of TDCs channels calibration. Typically, the
-calibration is automatically recalculated when a specified number of
-hits accumulated in each channel. To achieve a sufficient accuracy,
-about $10^5$-$10^6$ hits should be accumulated in each channel.
+different methods of TDC channels calibration. Either the calibration
+is automatically recalculated when a specified number of hits
+(typically $10^5$-$10^6$) has been accumulated in each channel.
Alternatively, one can store calibration functions determined by
-separate measurements (static approach). Later such calibration files
-can be used for any following measurements, which is especially useful
-in the case of low statistics.
+separate measurements (``static approach'') and use such calibration
+files for any following measurements. This is especially useful in
+case of low statistics.
\section{Front-end Electronics}\label{sec:frontends}
(\cref{fig:padiwa}). It uses the LVDS input buffers of a Lattice
MachXO2 FPGA to realise a leading edge discriminator for $16$ analogue
input signals. Besides that, few standard components like the MMIC
-BGA2802 ($20$\,dB wideband amplifiers) and RC low-pass filters are
+BGA2802 ($20$\,dB wide-band amplifiers) and RC low-pass filters are
used to generate the threshold voltages via pulse-width modulation.
Using test pulses with an amplitude of $500$\,$\mu$V and a length of
$6$\,ns, a time precision of the full system including the TRB3 of
The TRB3 can also be used as an infrastructure to read out specialised
integrated solutions using the peripheral FPGAs, for example to
provide a timing reference, transport the acquired data to the
-eventbuilder and configuration of the attached ASIC via slow control.
+event-builder and configuration of the attached ASIC via slow control.
This was realised for the n-XYTER ASIC
\cite{nxyter-2006,nxyter-twepp2007}, which provides the digital
timestamp and the analogue pulse height of self-triggered $128$
$855$\,MeV. A Cherenkov counter prototype using the DIRC principle was
placed in the beam line. The prototype comprises a highly-polished
fused silica bar with a lens attached, an oil-filled expansion volume
-and a photon detector matrix of $6$ $64$-channel MCP-PMTs, which
-were read out by the TRB3 system. In total, 4 TRB3s with TDC
+and a photon detector matrix of $6$ $64$-channel MCP-PMTs, which were
+read out by the TRB3 system. In total, 4 TRB3s with TDC
implementations were used with two different discriminator front-ends:
the PaDiWa and the NINO ASIC. The beam current was set to achieve a
trigger rate of approximately $6$\,kHz. The results show a worse
Cherenkov photon detection for PaDiWa with respect to the NINO ASIC,
as seen in the hit patterns, which is probably caused by differences
in the amplification stage (the gain of the latter is about $10$ times
-larger).
-% **Comment Michael**: I think we can not state that, as we don't know
-%the internal structure of the NINO and the physical threshold of the NINO
-%discriminators. You can say that the gain is more than a factor of 10 higher....).
-However, the TRB3 provided a stable platform for a successful
+larger). However, the TRB3 provided a stable platform for a successful
test beamtime.
\section{Outlook and Future Developments}\label{sec:outlook}
The Mainz TRB3 TDC Unpacker,
\href{https://github.com/neiser/mz-unpacker}{https://github.com/neiser/mz-unpacker}.
-\bibitem{dabc-pub} J. Adamczewski-Musch, S. Linev, E.Ovcharenko, and
- C.Ugur, \emph{HADES trbnet data formats,for DABC and Go4}, GSI
- Scientific Report 2012, PHN-SIS18-ACC-41, Darmstadt, 2013.
-
\bibitem{dabc-web}
The DABC website,
\href{http://dabc.gsi.de}{http://dabc.gsi.de}.
The Go4 website,
\href{http://go4.gsi.de}{http://go4.gsi.de}.
+\bibitem{dabc-pub} J. Adamczewski-Musch, S. Linev, E.Ovcharenko, and
+ C.Ugur, \emph{HADES trbnet data formats for DABC and Go4}, GSI
+ Scientific Report 2012, PHN-SIS18-ACC-41, Darmstadt, 2013.
+
\bibitem{nxyter-2006} A.S. Brogna et al., \emph{N-XYTER, a CMOS read-out
ASIC for high resolution time and amplitude measurements on high
rate multi-channel counting mode neutron detectors}, Nucl. Instrum.
jspc29 / publication.git / commitdiff