diff --git a/EDIT2013poster/beamerthemecpbgposter.sty b/EDIT2013poster/beamerthemecpbgposter.sty index 5787e91..9b0e33c 100644 --- a/EDIT2013poster/beamerthemecpbgposter.sty +++ b/EDIT2013poster/beamerthemecpbgposter.sty @@ -203,7 +203,8 @@ %\begin{beamercolorbox}[colsep=0.5cm]{cboxb} %\end{beamercolorbox} \hspace{12mm} -\begin{beamercolorbox}[wd=800mm,colsep=0.15cm]{cboxb} +\begin{beamercolorbox}[wd=810mm,colsep=0.15cm]{cboxb} + %841 mm for A4 portrait, wd = 841 - 2* colsep \end{beamercolorbox} } diff --git a/EDIT2013poster/contents.tex b/EDIT2013poster/contents.tex index 6c84d9e..16c0d4e 100644 --- a/EDIT2013poster/contents.tex +++ b/EDIT2013poster/contents.tex @@ -5,52 +5,63 @@ \begin{column}{\onecolwid}% the right size for a 3-column layout %--abstract block-------------------------------------------------------- \begin{alertblock}{Introduction} - Charged lepton flavor violation (cLFV) has yet to be observed and is - known to be sensitive to new physics beyond the Standard Model (SM). - Various extensions of the SM predicts that cLFV occurs at a detectable + \textcolor{red}{Charged lepton flavor violation (cLFV)} has yet to be + observed and is known to be sensitive to new physics beyond the + Standard Model (SM). + Various extensions of the SM predicts that cLFV occurs at some detectable branching ratio. Therefore, from experimental point of view, it is - attractive to search for cLFV with more powerful beams and better - detection technologies. + very attractive to search for cLFV with more powerful beams and better + detection techniques. Among the cLFV processes, $\mu-e$ conversion, a coherent neutrino-less conversion of muon to electron in the presence of a nucleus: \muecaz, is our interest. We have proposed a new search for $\mu -e$ conversion at J-PARC, the E21 experiment - \textcolor{red}{COMET}( \textcolor{red}{COherent Muon to Electron Transition}). The single - event sensitivity (SES) of COMET will be $2.6\times10^{-17}$, which is + event sensitivity (SES) of the COMET will be + \textcolor{red}{$2.6\times10^{-17}$}, which is 10,000 times better than that of the current experimental limit - set by SINDRUM II at $7\times10^{-13}$. + set by SINDRUM II at \textcolor{red}{$7\times10^{-13}$}. \end{alertblock} \begin{alertblock}{Staging approach of the COMET} In order to realize the COMET experiment, a two-stage approach has been - taken. COMET Phase-I aims at an intermediate SES of $3\times10^{-15}$, - which is an improvement of a factor of 100 compares to SINDRUM II. In - addition, the COMET Phase-I will make direct measurement of the proton - beam extinction and other potential background sources for the COMET - Phase-II experiment, using the actual COMET beam line. + taken. The first stage, \textcolor{red}{COMET Phase-I} has two major + goals: + \begin{enumerate} + \item \textcolor{red}{Search for $\mu-e$ conversion}: we aim at an + intermediate SES of \textcolor{red}{$3\times10^{-15}$}, which is an + improvement of a factor of 100 compares to SINDRUM II. + \item \textcolor{red}{Background measurements} for full COMET: make + direct measurement of the proton beam extinction and other + potential background sources, using the actual COMET beam line. + \end{enumerate} \begin{figure}[h!] \begin{center} - \includegraphics[width=0.95\onecolwid]{../figs/comet/comet_phase_1} + \includegraphics[width=0.96\onecolwid]{../figs/comet/comet_phase_1} \end{center} \caption{Schematic layout of the COMET} \label{fig:cometscheme} \end{figure} - The COMET Phase-I funding has been approved. Experimental hall - construction and beam - line design are in progress, and expected to finish in 2015. The layout - of the COMET beam line at Hadron Hall, J-PARC is shown in the Fig. - \ref{fig:cometbeamline}. For the COMET Phase-I, we will - construct the first 90 degrees of the muon beam line before extracting - to the experimental area. Data taking is expected to start around 2016. + Layout of the COMET experiment at Hadron Hall, J-PARC is shown in the + Fig~\ref{fig:cometbeamline}. For the COMET Phase-I, we will construct + the first \textcolor{red}{90 degrees} of the muon beam line before + extracting to the experimental area. + + The COMET Phase-I \textcolor{red}{funding has been approved} by KEK. + This will cover + experimental hall and beam line construction. The construction is + expected to finish in 2015, then data taking would start around + 2016. \begin{figure}[h!] \begin{center} - \includegraphics[width=0.95\onecolwid]{../figs/comet/comet_beamline} + \includegraphics[width=0.940\onecolwid]{../figs/comet/comet_in_hadron_hall} \end{center} + \vskip1.6ex \caption{COMET beam line at Hadron hall} \label{fig:cometbeamline} \end{figure} @@ -72,19 +83,21 @@ \begin{center} \includegraphics[width=0.99\twocolwid]{../figs/comet/comet_phase1_layout.png} \end{center} - \caption{Schematic lay out of the COMET Phase I} + \caption{Concept of the COMET Phase-I} \label{fig:phase1} \end{figure} \vskip-2ex \begin{columns}[t,totalwidth=\twocolwid] \begin{column}{\onecolwid} \begin{alertblock}{Proton beam} - COMET Phase-I will use an 8 GeV, 0.4 $\mu$A ($2.5 \times 10^{12}$ + COMET Phase-I will use an \textcolor{red}{8 GeV, 0.4 $\mu$A} ($2.5 \times 10^{12}$ protons/sec), slowly extracted proton - beam from the J-PARC main ring (MR). One option for the bunch - structure of the proton beam is shown in Fig \ref{fig:pbeam}. + beam from the J-PARC main ring (MR). One proposed configuration for + the bunch structure of the proton beam is shown in + Fig~\ref{fig:pbeam}. \begin{figure}[] - \includegraphics[width=0.75\onecolwid]{../figs/comet/comet_pbeam_config} + \includegraphics[width=0.65\onecolwid]{../figs/comet/comet_pbeam_config} + \vskip-1.5ex \caption{COMET proton beam acceleration bunch configuration} \label{fig:pbeam} \end{figure} @@ -92,21 +105,30 @@ \begin{alertblock}{Muon transportation} The muon beam line of COMET Phase-I includes the pion capture section and the muon transport section up to the end of first - $90^o$ bend. A high solenoidal field of 5 T is used in the pion - capture section to capture as many pions as possible. Pions and + $90^o$ bend. The field in the superconducting pion capture solenoid + is 5 T. Pions and muons - produced when pions decay in flight - goes to - a matching section, before going to the transport section with - a 3 T field. A prototype of this system has been built and operated - successfully at Osaka University. + a matching section, before going to the transport solenoid with + a 3 T field. \textcolor{red}{A prototype of this system has been + built and operated successfully at Osaka University.} Negative muons are selected by a dipole field, which is created by an additional winding on top of the solenoid windings. A collimator is placed in front of the detector section to eliminate high momentum muons (and survival pions). \begin{figure}[] - \includegraphics[width=0.75\onecolwid]{../figs/comet/mu_momentum_phase1} - \caption{Muon momentum before (upper) and after (lower) the collimator} - \label{fig:mumomentum} + \includegraphics[width=0.70\onecolwid]{../figs/comet/mu_stop_phase1} + \vskip-1.5ex + \caption{Momentum distribution of muons approaching the target + (open histogram) and those stopped by it (red)} + \label{fig:mustop} + \end{figure} + \end{alertblock} + \begin{alertblock}{Schedule} + \begin{figure}[!h] + \includegraphics[width=0.95\onecolwid]{../figs/comet/comet_phase1_sched} + %\caption{Technical driven schedule of COMET Phase-I} + \label{fig:sched} \end{figure} \end{alertblock} \end{column} @@ -115,41 +137,50 @@ \begin{alertblock}{Detectors for COMET Phase-I} There will be two detectors for two goals of COMET Phase-I: physics measurements and background measurements. - - Detector for background measurements consists of a solenoid magnet, - 0.8 - 1 T, 5 straw tube tracker layers and a crystal calorimeter. - This is regarded as a final prototype for Phase-II detector. + \begin{enumerate} + \item \textcolor{red}{$\mu-e$ conversion search:} + There are two candidates for the detector for the + search. \textcolor{red}{Baseline detector is a cylindrical + drift chamber (CDC)}, shown in the detector section in + Fig~\ref{fig:phase1}. + The CDC is chosen because it would help reducing background rate + and hit rate. The alternative option is using the same detector + for background measurements: a tranverse tracker, which is + decribed below. + + The CDC is placed inside a magnetic field of 1 - 1.5 T. It is + tuned to accept particles with momentum larger than 70 MeV/c. + Segmented triger hodoscope is located before the drift chamber, + provides timing signal and reduces protons hit rate on the + chamber. In order to reach the goal SES, energy resolution + requirement for the CDC is \textcolor{red}{1.5 MeV at 105 MeV}. + %\vskip-1ex + \begin{figure}[!h] + \includegraphics[width=0.90\onecolwid]{../figs/comet/comet_signal} + \vskip-1ex + \caption{Signal of $\mu-e$ conversion, electron with + momentum of about 105 MeV/c (red); and background from electron + from muon decay in orbit (blue).} + \label{fig:signal} + \end{figure} + + \item \textcolor{red}{Background measurements:} + A \textcolor{red}{tranverse tracker} will be used. It consists + of a solenoid magnet, 0.8 + - 1 T, 5 straw tube tracker layers and a crystal calorimeter. + This is regarded as a final \textcolor{red}{prototype for + Phase-II detector}. + \begin{figure}[!h] + \includegraphics[width=0.90\onecolwid]{../figs/comet/comet_p1_det_bg} + \vskip-1ex + \caption{Concept of the detector for background measurements} + \label{fig:phys_det} + \end{figure} + \end{enumerate} A lot of detector R\&D activities are ongoing: ECAL with GSO/LYSO crystals and APD readout; prototype of straw tube - tracker; front end electronic board. - \vskip-2ex - \begin{figure}[!h] - \includegraphics[width=0.95\onecolwid]{../figs/comet/comet_p1_det_bg} - \vskip-2ex - \caption{Concept of the detector for background measurements} - \label{fig:phys_det} - \end{figure} - There are two options for the detector for $\mu-e$ - conversion search. Baseline detector is a cylindrical drift chamber - (CDC), shown in the detector section in Fig. - \ref{fig:phase1}. The CDC would help reducing background rate and - hit rate. The other option is a transverse tracker, in - which the detector for background measurements will be reused. - - The CDC is placed inside a magnetic field of 1 - 1.5 T. The - magnetic field and radial size of the CDC are adjusted to accept - particles with momentum larger than 70 MeV/c. Segmented triger - hodoscope is located before the drift chamber, provides timing - signal and reduces protons hit rate on the chamber. In order to - reach the goal SES, energy resolution requirement for the CDC is - 1.5 MeV at 105 MeV. - \end{alertblock} - \begin{alertblock}{Schedule} - \begin{figure}[!h] - \includegraphics[width=0.95\onecolwid]{../figs/comet/comet_phase1_sched} - %\caption{Technical driven schedule of COMET Phase-I} - \label{fig:sched} - \end{figure} + tracker; front end electronic board; calculation and wire + chamber test for CDC; \ldots \end{alertblock} \end{column} \end{columns} diff --git a/EDIT2013poster/poster.tex b/EDIT2013poster/poster.tex index 681df23..2dd780c 100755 --- a/EDIT2013poster/poster.tex +++ b/EDIT2013poster/poster.tex @@ -6,7 +6,7 @@ \documentclass[final]{beamer} % use beamer \usepackage[orientation=portrait, size=a0, % poster size - scale=1.35 % font scale factor + scale=1.3 % font scale factor ]{beamerposter} % beamer in poster size % %--some needed packages-------------------------------------------------------- @@ -64,9 +64,9 @@ \newlength{\sepwid} \newlength{\onecolwid} \newlength{\twocolwid} -\setlength{\sepwid}{0.04\paperwidth} -\setlength{\onecolwid}{0.28\paperwidth} -\setlength{\twocolwid}{0.60\paperwidth} +\setlength{\sepwid}{0.025\paperwidth} +\setlength{\onecolwid}{0.30\paperwidth} +\setlength{\twocolwid}{0.625\paperwidth} %============================================================================== %==the poster content========================================================== %============================================================================== diff --git a/figs/comet/mu_stop_phase1.png b/figs/comet/mu_stop_phase1.png index af1b6ec..a794555 100644 Binary files a/figs/comet/mu_stop_phase1.png and b/figs/comet/mu_stop_phase1.png differ diff --git a/refs/Kuno_PSI_BVR.pdf b/refs/Kuno_PSI_BVR.pdf new file mode 100644 index 0000000..4d5c6f8 Binary files /dev/null and b/refs/Kuno_PSI_BVR.pdf differ