Changeset 751 in ETALON for papers/2016_HDR_ND/Advanced_diags/emittance.tex

Timestamp:

Nov 30, 2017, 11:58:33 PM (7 years ago)

Author:

delerue

Message:

HDR updated

File:

• papers/2016_HDR_ND/Advanced_diags/emittance.tex (modified) (9 diffs)

papers/2016_HDR_ND/Advanced_diags/emittance.tex

@@ -93 +93 @@
 \includegraphics[height=6.6cm]{Advanced_diags/runrun1_PP_shot100_10d_despeckle_cropped2.jpg}  & \\
 \end{tabular}
-\caption{Example of pepper-pots measurements similar to those reported in~\cite{Delerue:2010oda}. Left: image measured by the camera. Right False colors image and slits profiles.
+\caption{Example of pepper-pots measurements similar to those reported in~\cite{Delerue:2010oda}. Left: image recorded by the camera. Right: False colors image and slits profiles.
 \label{fig:measurements_pp} }
 \end{center}
@@ -104 +104 @@
 \begin{center}
 \begin{tabular}{cc} 
-  \includegraphics[width=8cm]{Advanced_diags/DLS_PP_image.png} & \includegraphics[width=8cm]{Advanced_diags/DLS_PP_diag.png} 
-\end{tabular}
-\caption{XXX Example of pepper-pots measurements similar to those reported in~\cite{REF DLS Delerue:2010oda}. Left: image measured by the camera. Right False colors image and slits profiles.
+  \includegraphics[width=7cm]{Advanced_diags/DLS_PP_image.png} & \includegraphics[width=7cm]{Advanced_diags/DLS_PP_diag.png} 
+\end{tabular}
+\end{center}
+\caption{Pepper pot measurement at the DIAMOND Light Source as reported in the booster to synchrotron line with a beam energy of \SI{2}{GeV} and \SI{3}{GeV}.  Left: image recorded by the camera. Right: transverse emittance calculated shot by shot on several images. Images taken from~\cite{thomas:in2p3-00851886}.
 \label{fig:measurements_pp_DLS} }
-\end{center}
-\end{figure} 
-
-I also investigated how to apply this technique to protons with measurements on LINAC2 at CERN.
-
-- Image CERN
-XXXXXXXXXXXXXXX
+\end{figure} 
+
+I also investigated how to apply this technique to protons with measurements on LINAC2 at CERN however the lack of time before changing job did not allow me to release the results of these measurements
 
 One of the concerns with that technique expressed several times during conferences was that the length of the pepper-pot channel might biais the emittance measurement. To validate my approach I made several calculations and GEANT4 simulations. The calculations have been published in~\cite{Delerue:2010pm} and I reproduced below the main arguments taken from~\cite{Delerue:2010pm} and encourage the interested reader to refer to the full publication.
@@ -675 +672 @@
 
 \begin{figure}[htbp]
+\begin{center}
 \includegraphics[height=6.5cm]{Advanced_diags/P1010015_cropped.JPG} 
 \caption{The multiple OTR and pepper-pot test beam line during a test installation at the Diamond Light Source before its shipment to Frascati.}
 \label{fig:motr_line}
-\end{figure} 
-
-\begin{figure}[htbp]
+\end{center}
+\end{figure} 
+
+\begin{figure}[htbp]
+\begin{center}
 \includegraphics[height=6.5cm]{Advanced_diags/DLS_beamline.png} 
-\caption{XXX The multiple OTR and pepper-pot test beam line during a test installation at the Diamond Light Source before its shipment to Frascati. Image taken from~\cite{1748-0221-6-07-P07004}.}
+\caption{Drawing of the multiple OTR and pepper-pot test beam line that has been used both at Frascati's Beam Test Facilty and at the Diamond Light Source. Image taken from~\cite{1748-0221-6-07-P07004}.}
+\end{center}
 \label{fig:motr_DLS_beamline}
 \end{figure} 
@@ -690 +691 @@
 
 \begin{figure}[htbp]
+\begin{center}
 \includegraphics[height=6.5cm]{Advanced_diags/multiple_OTR_DLS.png} 
+\end{center}
 \caption{Beam size on the fourth OTR screen during the Diamond Tests as function of the screens inserted upstream. We can see that the effect of the upstream screens on the beam size measured on the lat screen is negligible in x and about 5\% in y as was expected from our calculations.
 Image taken from~\cite{1748-0221-6-07-P07004}.}
@@ -697 +700 @@
 
 \begin{figure}[htbp]
+\begin{center}
 \includegraphics[height=6.5cm]{Advanced_diags/OTR_images_DIAMOND.png} 
+\end{center}
 \caption{
 Beam size on the fourth OTR screen during the Diamond Tests as function of the screens inserted upstream. We can see that the effect of the upstream screens on the beam size measured on the lat screen is negligible in x and about 5\% in y as was expected from our calculations.
@@ -725 +730 @@
 
 \begin{figure}[htbp]
+\begin{center}
 \includegraphics[height=6.5cm]{Advanced_diags/Nuclear_Emulsions_Image.png} 
+\end{center}
 \caption{Image of electrons on nuclear emulsions. Image taken form~\cite{reportAnaSimic}.}
 \label{fig:emulsions_image}
@@ -732 +739 @@
 
 \begin{figure}[htbp]
+\begin{center}
 \includegraphics[height=6.5cm]{Advanced_diags/Nuclear_Emulsions_Tracking.png} 
+\end{center}
 \caption{Emittance measurement using nuclear emulsions tracking.}
 \label{fig:emulsions_tracking}
@@ -751 +760 @@
 
 \begin{figure}[htbp]
+\begin{center}
 \includegraphics[height=6.5cm]{Advanced_diags/OTR_mask_setup.png} 
+\end{center}
 \caption{Layout of the masked OTR setup as taken from~\cite{reportBasJanZandt}.}
 \label{fig:masked_OTR_setup}
@@ -761 +772 @@
 
 \begin{figure}[htbp]
+\begin{center}
 \includegraphics[height=6.5cm]{Advanced_diags/Masked_OTR_Energy_Measurement.png} 
+\end{center}
 \caption{Simulations of  energy measurements using masked OTR taken from~\cite{reportBasJanZandt}.}
 \label{fig:masked_OTR_simul}
 \end{figure} 
 
-I am aware that at least another group has demonstrated the use of OTR to measure the energy of the beam\cite{xxx}. I am not aware of any group having used OTR to measure a beam energy spectrum or transverse emittance.
+I am aware that at least another group has demonstrated the use of OTR to measure the transverse emittance of a beam~\cite{Bisesto:2017qyu}. 
 
 
 \section{Overview of emittance measurement}
 
-My work on transverse emittance measurement has led to the conception and on beam demonstration of several single shot transverse emittance measurement diagnostics. The figure~\ref{fig:emulsions_emittance XXX} shows the type of beam parameters  where each of these techniques apply.
+My work on transverse emittance measurement has led to the conception and on beam demonstration of several single shot transverse emittance measurement diagnostics. The figure~\ref{fig:diags_range} shows the type of beam parameters  where each of these techniques apply.
+The emulsions can only be used on beams that have a low density as each impact needs to be resolved separately. The pepper-pots can measure higher density beams, but preferably at low energy (up to a few energy). The OTR based method is also for high density beams (when the OTR light is strong enough) and are better suited to high energy as the scattering is inversely proportional to the energy.
 
 
 \begin{figure}[htbp]
 \includegraphics[height=6.5cm]{Advanced_diags/3_techniques.png} 
-\caption{XXX Accuracy of the emittance reconstruction depending on the electrons density (simulations taken from \cite{reportNickShipman2}).}
-\label{fig:emulsions_emittance XXX}
+\caption{Range of applicability of the three techniques discussed in this chapter: the emulsions are better suited to low density beams; the pepper-pots are better suited to high density beams and rather low energy (up to a few GeV) whereas the OTR techniques are better suited to high intensity high energy beam..}
+\label{fig:diags_range}
 \end{figure}