\documentclass[%
pdf,
%nocolorBG,
colorBG,
slideColor,
%slideBW,
%draft,
%frames
azure
%contemporain
%nuancegris
%troispoints
%lignesbleues
%darkblue
%alienglow
%autumn
]{prosper}
\usepackage{amsmath}
\usepackage{color}
\usepackage{hyperref}
\title{CLIC Beam Delivery System}
\author{Rogelio Tom\'as Garc\'{\i}a}

\definecolor{lightblue}{rgb}{0.85,0.95,1}
\definecolor{green1}{rgb}{0,1,0}
\definecolor{green2}{rgb}{0.166667,0.833333,0}
\definecolor{green3}{rgb}{0.333333,0.666667,0}
\definecolor{green4}{rgb}{0.5,0.5,0}
\definecolor{green5}{rgb}{0.666667,0.333333,0}
\definecolor{green6}{rgb}{0.833333,0.166667,0}
\definecolor{green7}{rgb}{1,0,0}
\definecolor{orange}{rgb}{1,0.55,0}
\begin{document}

\begin{slide}[Replace]{}
\begin{center}
%\includegraphics[height=4.3cm]{first_X_Ray.ps}\\\vspace{0.0cm}
\color{yellow}
{\bf  CLIC Beam Delivery System}\\\vspace{0.6cm}
\includegraphics[height=1.3cm]{logosss.ps}\\\vspace{0.6cm}
R. Tom\'as,  H.~Braun, A.~Latina, G.~Rumolo and D.~Schulte  \\\vspace{0.6cm}
September 2008
\end{center}
\end{slide}

\begin{slide}[Replace]{\fbox{Contents}}
\color{yellow}
\begin{itemize}	
  \item The CLIC 3TeV BDS:
     \begin{itemize}
        \item Beam diagnostics section
	\item Collimation section
	\item Final Focus System: 4.3m and 3.5m L*
        \item ATF2 ultra-low betas
	\item BDS Collective effects
     \end{itemize}
  \item The CLIC 500GeV BDS
  \item Collaborators
  \item Workplan towards 2010
\end{itemize}

\end{slide}





\begin{slide}[Replace]{\fbox{Diagnostics: emittance measurement}}
\begin{center}\vspace{-0.4cm}
\colorbox{white}{\includegraphics[height=10cm,angle=-90]{diagnostics.ps}}
\put(-220,-10){\tiny \color{blue} SQ1}
\put(-210,-20){\tiny  \color{blue} SQ2}
\put(-200,-10){\tiny  \color{blue} SQ3}
\put(-190,-20){\tiny  \color{blue} SQ4}
\put(-160,-20){\tiny \color{red} LW1}
\put(-122,-20){\tiny \color{red} LW2}
\put(-105,-20){\tiny \color{red} LW3}
\put(-68,-20){\tiny \color{red} LW4}
\put(-290,-208){\color{black} $\sigma_y\!\!=\!\!1\mu m$ @ Laser wires (for $\epsilon_y$=20nm)}
\end{center}
%\color{yellow}Present laser wires measure $\sigma_y\!\!=\!\!1\mu m$ with 1\% error.
\end{slide}


\begin{slide}[Replace]{\fbox{Emittance measurement}}
\color{yellow}
Simulations by I.~Agapov: 3 trains, 3 wires and 10\% error on beam size assumed.
\begin{center}
\colorbox{white}{\includegraphics[height=5.5cm,angle=-0]{ey.eps}}
\put(-100,150){\tiny \color{black}geometric emittance}
\put(-220,80){\tiny \rotatebox{90}{\color{black}counts}}\\
$\Delta\epsilon_{x,y}/\epsilon_{x,y} \approx 7\%$
\end{center}
\color{yellow}
\end{slide}



\begin{slide}[Replace]{\fbox{Diagnostics inside collimation}}
\begin{center}\color{black}
\colorbox{white}{\includegraphics[height=10cm,angle=-90]{diag_coll.madx.ps}}
%\put(-230,-50){\small Diagnostics}
%\put(-163,-20){\small Energy}
%\put(-170,-30){\small collimation}
%\put(-102,-50){\small Betatron}
% \put(-110,-60){\small collimation}
%\put(-45,-40){\small FFS}
\end{center}
\color{yellow}
\end{slide}





\begin{slide}[Replace]{\fbox{Layout \& photon collection}}
\begin{center}
\colorbox{white}{\includegraphics[height=10cm,angle=-90]{photons.eps}}
\end{center}
\color{yellow}
\end{slide}



\begin{slide}[Replace]{\fbox{CLIC compact energy measurement}}
\begin{center}
\colorbox{white}{\includegraphics[height=10cm,angle=-90]{EnergyMeas.eps}}
\end{center}
\color{yellow}
\end{slide}

\begin{slide}[Replace]{\fbox{Collimation section}}
\begin{center}
\colorbox{white}{\includegraphics[height=8.6cm,angle=-90]{collimation.eps}}
\end{center}
\color{yellow}
Cleaning inefficiency for new parameters under
investigation by J.~Resta. 
\end{slide}




\begin{slide}[Replace]{\fbox{Collimator survival (J.~Resta, L.~Fernandez)}}
\begin{center}
\colorbox{white}{\includegraphics[height=6.7cm,angle=0]{tempColl.eps}}
\end{center}
\color{yellow}
Be thermal fracture limit = 370K $\rightarrow$ Good!
\end{slide}



\begin{slide}[Replace]{\fbox{Collimation wakefields}}
\begin{center}
\colorbox{white}{\includegraphics[height=10cm,angle=-90]{jitter_y.ps}}
\end{center}
\color{yellow}
Tolerance in the level of the 0.1$\sigma_y$
\end{slide}



\begin{slide}[Replace]{\fbox{Final Focus System with L$^{*}$=3.5m}}
\begin{center}
\colorbox{white}{\includegraphics[height=10cm,angle=-90]{ffs3.5.eps}}
\end{center}
\color{yellow}
\end{slide}



\begin{slide}[Replace]{\fbox{Final Focus Systems, 3.5m versus 4.3m L*}}
\begin{center}
\colorbox{white}{\includegraphics[height=11cm,angle=-90]{/afs/cern.ch/user/r/rtomas/w1/scratch/FULL_BDS_1.5TeV/BandWidth/BDS_L4.3/bw.lumi.peak.comp.eps}}
\end{center}
\color{yellow}
$\rightarrow$ Slightly larger peak-lumi-bandwidth for the 3.5m L* FFS
\end{slide}


\begin{slide}[Replace]{\fbox{Saturation of the peak luminosity}}
\begin{center}
\colorbox{white}{\includegraphics[height=6cm,angle=0]{dispscalesigz1e2.eps}}
\end{center}
\color{yellow}
$\rightarrow$ With the current beam parameters further reductions of IP beam size do not increase peak lulminosity
\end{slide}



\begin{slide}[Replace]{\fbox{Alignment of the collimation section}}
\begin{center}
\colorbox{white}{\includegraphics[height=8.5cm,angle=-90]{plot.onlycoll.ps}}
\end{center}
\color{yellow}
$\rightarrow$ Dispersion Free Steering works in the collimation section.
\end{slide}



\begin{slide}[Replace]{\fbox{The more complex FFS}}
\begin{center}
\colorbox{white}{\includegraphics[height=8.5cm,angle=-90]{ffsorbits.eps}}
\end{center}
\color{yellow}
The FFS is the most complex section. Rather than align the FFS more general tuning algoritms must be used. 
\end{slide}




\begin{slide}[Replace]{\fbox{Luminosity after tuning}}
\begin{center}
\colorbox{white}{\includegraphics[height=8.5cm,angle=-90]{/afs/cern.ch/eng/sl/lintrack/CLIC-DFS/bds_dfs_ff/results-Lumi/hist.sigma.end.HV.eps}}
\end{center}
\color{yellow}
80\% of the seeds give more than 80\% of the design luminosity $\rightarrow$ 20\% fail.
\end{slide}


\begin{slide}[Replace]{\fbox{ATF2 ultra low betas: Chromaticity}}
\color{yellow}\small
\begin{center}
\begin{tabular}{|l|l|l|l|r|r|}\hline
Project & Status   & $\beta_y^*$ [mm] & L$^*$ [m] & L$^*$/$\beta_y^*$ & $\xi_y$\\\hline
FFTB    & Design &  0.1  & 0.4        & 4000  & 17000 \\\hline
FFTB    & Measured &  0.167  & 0.4    & 2400  & 10000 \\\hline
{\color{orange}ATF2}    & Design   &  0.1  & 1.0      & 10000 & {\color{orange}19000} \\\hline
{\color{red}ATF2 pushed} & Proposed & 0.05 & 1.0   & 20000 & {\color{red}38000} \\\hline
{\color{red}CLIC 500GeV} & Design   & 0.2 & 4.3    & 21500 & {\color{red}35000} \\\hline
CLIC 3TeV   & Design   & 0.09 & 3.5    & 39000 & 63000 \\\hline
{\color{orange}ILC}     & Design   &  0.4  & 3.5      & 8750  & {\color{orange}15000} \\\hline
ILC  pushed   & Design   &  0.2  & 3.5  & 17500  & 30000 \\\hline
\end{tabular}
\end{center}
\end{slide}


\begin{slide}[Replace]{\fbox{ATF2 ultra low betas: Tuning difficulty}}
\color{yellow}
\begin{center}
\small
\begin{tabular}{|l|l|r|}\hline
Project & Status   & $\sigma_y^*$ [nm]\\\hline
FFTB    & Measured & 70       \\\hline
{ATF2}    & Design   & 37 \\\hline
{ATF2 pushed} & Proposed & <26 \\\hline
{ILC}     & Design   & 6 \\\hline
{CLIC 500GeV} & Design   & 3 \\\hline
\end{tabular}
\end{center}
Does tuning difficulty scale as $\sigma_y^{*^{-1}}$?\\
Both ILC and CLIC need as low ATF2 $\sigma_y^*$ as possible.\\
What is the minimum achievable $\sigma_y^*$ in ATF2?

\end{slide}




\begin{slide}[Replace]{\fbox{On-going optimization with MAPCLASS}}
\color{yellow}
\begin{center}%\vspace{-1.2cm}
%{\includegraphics[height=9cm,angle=-90]{variable.beam.size.and.linear.size.ps}}
\colorbox{white}{\includegraphics[width=8.5cm,angle=0]{sigmayVsbety.epsi}}
\put(-190,40){\colorbox{white}{\LARGE\color{white}cacacacac}}
\put(-190,30){\colorbox{white}{\LARGE\color{white}cacacacac}}
\put(-194.8,40){\color{black}$\bullet$$\leftarrow$MAPCLASS optimization}
%\put(-60,-10){\color{black}L=2750m}
%\put(-45,-23){\color{black}(-100m)}
\end{center}
\end{slide}


\begin{slide}[Replace]{\fbox{Initial $\sigma_y$ for 150 seeds}}
\color{yellow}
\begin{center}
\colorbox{white}{\includegraphics[height=8cm,angle=-90]{..//ATF2_07/hist.sigma.init.HV.eps}}
%\put(-60,-10){\color{black}L=2750m}
%\put(-45,-23){\color{black}(-100m)}
\end{center}
Up to 4$\mu$m of initial $\sigma_y$.
\end{slide}



\begin{slide}[Replace]{\fbox{Number of iterations for $\beta_y$=0.1mm}}
\color{yellow}
\begin{center}
\colorbox{white}{\includegraphics[height=8cm,angle=-90]{/afs/cern.ch/user/r/rtomas/lintrack/TEX/CLIC_alignment/hist.iter.HV.eps}}
\end{center}
Below 8000 iterations required.
\end{slide}

\begin{slide}[Replace]{\fbox{Number of iterations for $\beta_y$=0.05mm}}
\color{yellow}
\begin{center}
\colorbox{white}{\includegraphics[height=8cm,angle=-90]{/afs/cern.ch/user/r/rtomas/lintrack/CLIC-DFS/ATF2/PLACET/NEWBETAS/hist.iter.HV.eps}}
\end{center}
Below 12000 iterations required but maximum is hit.\\
More iterations are required for lower $\beta$! 
\end{slide}


\begin{slide}[Replace]{\fbox{Final $\sigma_y$ for $\beta_y$=0.1mm} }
\color{yellow}
\begin{center}
\colorbox{white}{\includegraphics[height=8cm,angle=-90]{..//ATF2_07/hist.sigma.end.HV.eps}}
%\put(-60,-10){\color{black}L=2750m}
%\put(-45,-23){\color{black}(-100m)}
\end{center}
Final $\sigma_y$ between 37 and 44nm.
\end{slide}



\begin{slide}[Replace]{\fbox{Final $\sigma_y$  for $\beta_y$=0.05mm}}
\color{yellow}
\begin{center}
\colorbox{white}{\includegraphics[height=8cm,angle=-90]{/afs/cern.ch/user/r/rtomas/lintrack/CLIC-DFS/ATF2/PLACET/NEWBETAS/hist.sigma.end.HV.eps}}
\end{center}
Some seeds fail to finish between 30 and 37nm and one seed even
stops at 53nm!!\\
More sophisticated tuning algorithms are required for lower $\beta$! $\rightarrow$ Same problem as in CLIC

\end{slide}




\begin{slide}[Replace]{\fbox{Fast ion instability in the CLIC BDS}}
\begin{center}
%\colorbox{white}{\includegraphics[height=8.5cm,angle=-90]{/afs/cern.ch/eng/sl/lintrack/CLIC-DFS/bds_dfs_ff/results-Lumi/hist.sigma.end.HV.eps}}
\end{center}
\color{yellow}
$\rightarrow$ Not a problem 
\end{slide}


\begin{slide}[Replace]{\fbox{Resistive wall in the BDS}}
\begin{itemize}\color{yellow}
\item It amplifies the incoming jitter of the beam
\item and it decreases for larger beam pipes $\left(\propto \frac{1}{r^3}\right)$
\item Conservative estimates by D.~Shulte and G.~Rumolo suggest r=8mm
\end{itemize}


\end{slide}



\begin{slide}[Replace]{\fbox{CSR in the BDS?}}
\color{yellow}
CSR module in PLACET by E.~Adli.
\begin{center}\vspace{-0.2cm}
\colorbox{white}{\includegraphics[height=8.cm,angle=-90]{ediff.eps}}\end{center}
Negligible effect, also from formula:\\
$<\delta E> \propto \frac{r_eqLE_0}{e\gamma(R^2\sigma_s^4)^{1/3}} \approx 1 \ MeV$
\end{slide}



\begin{slide}[Replace]{\fbox{CLIC 500GeV BDS: a proposal}}
\color{yellow}

\begin{center}\vspace{-0.2cm}
\colorbox{white}{\includegraphics[height=9.5cm,angle=-90]{/local/home/rtomas/BACKUPED_SPACE/w1/MAD/CLIC/Latest/BDS/FULL_BDS_250GeV/FromNLC/BDS.Scaled.eps}}
\end{center}
Collimation section can be scaled by a factor 2.\\
Dispersion and efficiency still to be optimized.
\end{slide}






\begin{slide}[Replace]{\fbox{Summary}}
\color{yellow}
\begin{itemize}
   \item Convergence to an optimized BDS design
   \item The challenge remains to verify 
         tuning in realistic simulations  
         with dynamic effects
   \item Lots to learn from ATF2 experience
   \item and many details to address...
 \end{itemize}
\end{slide}




\begin{slide}[Replace]{\fbox{Workplan towards 2010 \& \color{red}{collaborators}}}
\color{yellow}
\begin{itemize}
   \item FFS tuning and dynamic effects simulations:  lots of work and need of new ideas (2010)\\
    \color{red}* Interest from CI, SLAC and LAL but shortage of manpower \color{yellow}

   \item ATF2 regular experience (2010) and ultra-low $\beta$s (2011)\\
     \color{red}* KEK, LAL, LAPP, SLAC, CI, Oxford \color{yellow}
   \item Collimation efficiency validation for new parameters at 3TeV (end 2008) and for 500GeV (2009)\\
     \color{red}* Oxford and CI \color{yellow}

   \item Final quadrupole design validation (2009)\\
\color{red}* ? \color{yellow}
   \end{itemize}
\end{slide}

\begin{slide}[Replace]{\fbox{Workplan towards 2010 \& \color{red}{collaborators}}}
\color{yellow}
\begin{itemize}
   \item Polarization measurement design (2009)\\
     \color{red}* SLAC may express interest \color{yellow}
   \item Post-collision line and dump design (2010)\\
     \color{red}* Upsala, ?  \color{yellow}
   \item Collective effects review (2009)
     
 \end{itemize}
\end{slide}

\end{document}




