\section{Cost estimate} \label{sec:cost} \noindent The proposed measurements will make use of the existing \compass\ spectrometer as described in Ref.~\cite{Abbon:2007pq} and of the upgrades performed during the years 2005--2010. However, the new physics programmes require a number of additions and modifications. Furthermore, some of the original equipments are by now 10 years old or more and need to be refurbished or replaced. Typical cases are the DAQ, the pumps of the polarised target (more than 25 years old) and the silicon trackers in the beam, which suffer from radiation damage. The responsibility for maintenance and operation of an existing equipment will in general stay with the same group as in the present \compass\ experiment. In Table~\ref{tab:responsibilities} these responsibilities are summarised together with those for new equipment and a first estimate of the necessary investment for construction, refurbishment or upgrade. The major new equipments for the GPD programme are the new electromagnetic calorimeter ECAL0 close to the target and the proton recoil detector RPD with its liquid hydrogen target. For the DY programme the modified polarised target with the hadron absorber are the new key elements. The considerable upgrade of ECAL1 is required for the DVCS part of the GPD programme. Here, for the cost evaluation it was assumed that ECAL2 remains unchanged and that the central holes of ECAL1 and HCAL1 are somewhat reduced (``Option 3'' on page \pageref{pag:ECAL_opt3}). The upgrade of the peripheral part of the RICH-1 photon detection is important for a stable operation of the RICH in a high-flux environment. The RICH itself is essential for the exclusive meson production part of the GPD programme as well as for the simultaneously performed measurements of unpolarised SIDIS. \begin{figure}[h] \begin{center} \includegraphics[width=0.5\hsize]{org_funds} \end{center} \caption{Tentative sharing of new investment cost between the participating countries in per cent.} \label{fig:org_funds} \end{figure} The cost estimate is in an early stage and numbers are very preliminary. The total projected investment is roughly 7~MCHF, about one quarter of the total fresh \mbox{\compass-I} investment. \compass\ is inviting and actively searching for new collaborators. Therefore changes in the responsibilities should be expected in the further development of the project. The present sharing between the participating countries is shown in Fig.~\ref{fig:org_funds}. %A small fraction of 1.6\% could not yet be attributed and is indicated by ``?''. Within the German groups the sharing is still under discussion. The item concerned is temporarily marked by ``BMBF'' in Table~\ref{tab:responsibilities}. Apart from the requested contributions by \cern\ as collaborating institute listed in Table~\ref{tab:responsibilities}, the new experiment would require from \cern\ as host laboratory the continuation of the services granted for the present \compass\ experiment, in particular in cryogenics and central data recording. The question of cost for recording media should be rediscussed. A major problem is the temperature in the experimental hall EHN2 (888). In summer it grows well over 30 degree and causes severe problems for the chambers due to thermal expansion as well as to the electronics. Before a new round of experiments is started a refurbishment of the about 35 years old ventilation system is indispensable. \begin{table}[p] \caption{Tentative responsibilities in \compass-II for detector operation and maintenance as well as estimated cost of repair, modification of existing and of construction of new equipment in kCHF.} \label{tab:responsibilities} \begin{center} %\scalebox{.8}{ \begin{tabular}{|l|lrl|} \hline Item & Institution & Invest & Remarks\\ \hline Beam Momentum Station & Bonn HISKP & & \\ Scintillating Fibres & Bonn HISKP/Erlangen & 150& more det. \\ Silicon Beam Telescope & TU Munich & 100& new wafers \\ MicroMegas & Saclay & & \\ Pixel MicroMegas & Saclay & 420& new \\ DC Drift Chambers & Saclay & & \\ GEMs \& PixelGEMs & TU Munich & & \\ Straws & Freiburg/Munich LMU & & \\ MWPCs & Turin & & \\ Rich Wall & Turin & & \\ Muon Wall 1 & JINR & & \\ W45 drift Chambers & CERN & 30& repair \\ Muon Wall 2 & IHEP Protvino & & \\ \hline Total trackers\bigstrut & & \bf 700& \\ \hline %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% ECAL0 & & & new \\ \quad Modules (250) & JINR & 372& \\ \quad Housing \& Temp. Stab. & JINR & 100& \\ \quad LED Monitoring & JINR & 40& \\ \quad Readout (MSADCs) & TU Munich & 250& \\ \quad MAPD & Saclay & 60& \\ & Warsaw UT & 90& \\ \quad Preamplifiers & Warsaw SINS/WU & 30& \\ \quad Frame & CERN & 50& \\ %\hline %Total ECAL0 & & 992& \\ %\hline ECAL1 & & & upgrade \\ \quad Shashlik Modules (600) & BMBF & 80& \\ & Mainz & 50& \\ & Freiburg & 50& \\ & Saclay & 30& \\ \quad GAMs Modules (1700) & IHEP Protvino & & exist \\ \quad PMs & IHEP Protvino & 270& exist \\ \quad HV Bases & Freiburg & 106& \\ \quad Readout (MSADCs) \& cables & Mainz & 110& \\ & Saclay & 50& \\ & TU Munich & 70& \\ \quad Monitoring ext. & Saclay & 75& \\ %\hline %Total ECAL1 & & 886& \\ %\hline ECAL2 Monitoring & Lisbon & 50& new \\ HCAL1 Modification & JINR & 50& \\ \hline Total Calorimeters \bigstrut & & \bf 1983& \\ \hline \end{tabular} \end{center} \end{table} %\newpage \begin{table}[p] \addtocounter{table}{-1} \caption{(cont'd) Tentative responsibilities in \compass-II for detector operation and maintenance as well as estimated cost of repair, modification of existing and of construction of new equipment in kCHF.} \begin{center} \begin{tabular}{|l|lrl|} \hline Item & Institution & Invest & Remarks\\ \hline %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% RPD/LH Target & & & new \\ %\hline \quad RPD Structure & Saclay & 150& \\ \quad PMs & Saclay & 60& \\ & Warsaw SINS/WU & 30& \\ & Calcutta & 30& \\ \quad Scintillators/Lightguides & Saclay & 210& \\ & Mainz/Bonn PI & 70& \\ \quad Readout & Freiburg & 190& \\ \quad HV, Crates, Electronics & Saclay & 80& \\ & Warsaw SINS/WU & 50& \\ & Warsaw UT & 20& \\ \quad LH Target & Saclay & 75& \\ & CERN & 75& \\ & Yamagata & 25& \\ \hline Total RPD\&LH Target \bigstrut & & \bf 1065& \\ \hline %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% RICH-1 Upgrade & & & upgrade \\ \quad Peripheral Chambers & Trieste/Turin & 1080& \\ & Prague & 20& \\ \quad Read-out (under study) & Trieste/Turin & 700& \\ CEDAR Upgrade & Mainz & 100& upgrade \\ \hline Total RICH \& CEDAR \bigstrut & & \bf 1900& \\ \hline %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% Polarised Target & & & \\ \quad Pumps refurbishment & Yamagata & 150& maintenance \\ \quad EIO Microwave Tube & Yamagata & 100& replacement \\ \quad Target material (NH3) & Bochum & 80& replacement \\ \quad Target holder & Bochum & 50& modification \\ \quad Cavity & Bochum & 20& modification \\ \quad & Prague & 30& \\ Hadron Absorber & Turin & 110& new \\ & Lisbon & 30& new \\ & CERN & 60& new \\ \hline Total PT \& Absorber \bigstrut & & \bf 630& \\ \hline %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %DAQ/Trigger/DCS & & & replacement/upgrade\\ Veto/Matrices & Mainz/Bonn PI & 100 & new \\ DAQ & TU Munich & 150 & replacement \\ & Turin/Trieste & 150 & \\ & Prague & 60 & \\ & Tel Aviv & 25 & \\ DCS & Lisbon & 50 & upgrade \\ \hline Total DAQ/Trigger/DCS \bigstrut & & \bf 535& \\ \hline %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% Infrastructure & CERN & \bf 250 & modification \\ \hline Total \bigstrut & & \bf 7063 &\\ \hline \end{tabular} %} \end{center} \end{table}