From: Andreas Neiser Date: Wed, 23 Oct 2013 05:38:55 +0000 (+0200) Subject: Cahit changes incorporated, but Padiwa transparent missing X-Git-Url: https://jspc29.x-matter.uni-frankfurt.de/git/?a=commitdiff_plain;h=22be3ab7b1a7502fdfe06cd7f6ffc486e048b195;p=publication.git Cahit changes incorporated, but Padiwa transparent missing --- diff --git a/2013-twepp-neiser-trb3_applications/.gitignore b/2013-twepp-neiser-trb3_applications/.gitignore index f7eba6f..2d1c9a0 100644 --- a/2013-twepp-neiser-trb3_applications/.gitignore +++ b/2013-twepp-neiser-trb3_applications/.gitignore @@ -5,3 +5,5 @@ *.log *.sed *-poorman.* +*.loc + diff --git a/2013-twepp-neiser-trb3_applications/twepp2013-neiser-trb3.pdf b/2013-twepp-neiser-trb3_applications/twepp2013-neiser-trb3.pdf index 89d6408..4b18121 100644 Binary files a/2013-twepp-neiser-trb3_applications/twepp2013-neiser-trb3.pdf and b/2013-twepp-neiser-trb3_applications/twepp2013-neiser-trb3.pdf differ diff --git a/2013-twepp-neiser-trb3_applications/twepp2013-neiser-trb3.tex b/2013-twepp-neiser-trb3_applications/twepp2013-neiser-trb3.tex index 61b972c..0b17a65 100644 --- a/2013-twepp-neiser-trb3_applications/twepp2013-neiser-trb3.tex +++ b/2013-twepp-neiser-trb3_applications/twepp2013-neiser-trb3.tex @@ -3,30 +3,30 @@ \documentclass{JINST} -\usepackage{changes} -\definechangesauthor[name={Cahit Ugur}, color=orange]{CU} +%\usepackage{changes} +%\definechangesauthor[name={Cahit Ugur}]{CU} \title{TRB3: A 264 Channel High Precision TDC Platform and Its Applications} -\author{J.~Adamczewski-Musch$^a$, -M.~Hoek$^b$, -W.~Koenig$^a$, +\author{A.~Neiser$^a$\thanks{Corresponding author.}, +J.~Adamczewski-Musch$^b$, +M.~Hoek$^a$, +W.~Koenig$^b$, G.~Korcyl$^c$, -S.~Linev$^a$, +S.~Linev$^b$, L.~Maier$^d$, J.~Michel$^e$, -A.~Neiser$^b$\thanks{Corresponding author.}, M.~Palka$^c$, M.~Penschuck$^e$, -M.~Traxler$^a$, -C.~U\u{g}ur$^a$,~ +M.~Traxler$^b$, +C.~U\u{g}ur$^b$,~ and A.~Zink$^f$ \\ -\llap{$^a$} GSI Helmholtz Centre for Heavy Ion Research GmbH\\ -Planckstr. 1, Darmstadt, Germany\\ -\llap{$^b$} Institute of Nuclear Physics,\\ +\llap{$^a$} Institute of Nuclear Physics,\\ J.-J.-Becher Weg 45, Mainz, Germany\\ +\llap{$^b$} GSI Helmholtz Centre for Heavy Ion Research GmbH\\ +Planckstr. 1, Darmstadt, Germany\\ \llap{$^c$} Department of Physics, Astronomy and Applied Informatics, Jagiellonian University\\ Reymonta 4, Cracow, Poland\\ @@ -157,22 +157,19 @@ subsequently analysed offline. There are also interfaces to DABC \cite{dabc-web} which enables online monitoring and calibration of the TRB3 read-out. -Since the length of the total propagation delay on each delay line of the TDC -depends highly on the specific placing and routing of the elements inside the -FPGA, a proper calibration of this fine-time is necessary. This can be done -simply by assuming that each element has the same propagation delay, but this -limits the time precision to about $1$\,ns. \added[id=CU]{(where did you get - this information from? From my measurements I get up to 40 ps precision. But - sometimes there is the risk of getting double or more peaks. So this method - is only for test purposes. I don't think this should be in the paper.)} If -one assumes that the read-out clock is uncorrelated to the measured signals, a -\emph{flat} fine-time histogram of all detected signals is expected. Any -deviation must be due to different propagation delays, thus each element -can be calibrated appropriately (details see \cite{ugur-twepp2011}). However, -if the detector signal rate is not sufficient (leading to insufficient -statistics in the fine-time histogram), artificial hits stemming from an -uncorrelated signal source must be additionally generated and read-out. This -technique is already available on the TRB3 and is currently under test. +Since the length of the total propagation delay on each delay line of +the TDC depends highly on the specific placing and routing of the +elements inside the FPGA, a proper calibration of this fine-time is +necessary. If one assumes that the read-out clock is uncorrelated to +the measured signals, a \emph{flat} fine-time histogram of all +detected signals is expected. Any deviation must be due to different +propagation delays, thus each element can be calibrated appropriately +(details see \cite{ugur-twepp2011}). However, if the detector signal +rate is not sufficient (leading to insufficient statistics in the +fine-time histogram), artificial hits stemming from an uncorrelated +signal source must be additionally generated and read-out. This +technique is already available on the TRB3 and is currently under +test. \section{Front-end Electronics}\label{sec:frontends} @@ -195,7 +192,7 @@ technique is already available on the TRB3 and is currently under test. \centering \begin{minipage}{0.4\linewidth} \centering - \includegraphics[width=\textwidth]{gfx/frontends/padiwa_transparent.png}\\ + \includegraphics[width=\textwidth]{gfx/frontends/padiwa}\\ (a) \end{minipage} \quad @@ -214,13 +211,11 @@ The PaDiWa\footnote{Acronym for PANDA, DIRC, WASA.} is the first front-end board following the COME\&KISS principle (\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. \replaced[id=CU]{Besides that, few standard components like $10$x -MMIC wideband amplifiers and RC low-passes are used to generate the -threshold voltages via PWM.}{Besides that, only standard components like an $10$x -MMIC wideband amplifier and RC low-passes to generate the -threshold voltages via PWM are used.} 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 $23$\,ps was measured +input signals. Besides that, few standard components like $10$x MMIC +wideband amplifiers and RC low-passes are used to generate the +threshold voltages via PWM. 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 $23$\,ps was measured \cite{ugur-twepp2012}. This front-end has been successfully used in the test beamtimes, see \cref{sec:juelich,sec:mainz}. @@ -350,14 +345,14 @@ Finally, we present some planned or ongoing extensions of the platform. The detection of leading and trailing edge in a single TDC channel, which doubles the number of channels per board for timestamp and width measurements. This feature is highly desired for the -described charge-to-width front-end. The temperature -\replaced[id=CU]{independence}{stability} of the PaDiWa thresholds and of the -TDC calibration is currently investigated. There are also two further -front-end developments: Integration of the MuPix ASIC for the PANDA luminosity -detector and the SPADIC ASIC for a TPC in Mainz. Since both ASICs use the -CBMnet protocol, an implementation of CBMnet on the TRB3 was -started. Furthermore, an extension of TrbNet with defined propagation delays -of trigger signals for PANDA is being developed and tested. +described charge-to-width front-end. The temperature independence of +the PaDiWa thresholds and of the TDC calibration is currently +investigated. There are also two further front-end developments: +Integration of the MuPix ASIC for the PANDA luminosity detector and +the SPADIC ASIC for a TPC in Mainz. Since both ASICs use the CBMnet +protocol, an implementation of CBMnet on the TRB3 was started. +Furthermore, an extension of TrbNet with defined propagation delays of +trigger signals for PANDA is being developed and tested.