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\begin{center} The photo of the diagnostics.\end{center}}


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%\href{http://golem.fjfi.cvut.cz/shots/39417/}{
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{\begin{center} The relevant diagnostic line from the discharge \href{http://golem.fjfi.cvut.cz/shots/39417/}{\#39417}.\end{center}}
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\begin{document}
\title{Research into Runaway electron physics basis on the small tokamak GOLEM \\brief summary of the REs@tGOLEM current status \\for the Grant proposal}
\maketitle
\def\vcite#1{[#1]\nocite{#1}}

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\section{Introduction}

This document serves as a very rough (with the minimum necessary energy to create it) introductory overview of the activities in the area of physics and diagnostics of the Runaway electrons issues on the Golem tokamak through the relevant lists of publications for a given issue.

%Radiation processes generated by Runaway electrons in tokamaks topic.





\section{REs Physics}
\begin{refsection}

Comparison of COMPASS and GOLEM tokamaks is in the Master thesis \vcite{FickerMT15}. One paragraph in the article \vcite{StockelJOFE19} is dedicated to Runaway electrons.

\printbibliography[heading=subbibliography]

\end{refsection}



\section{REs Diagnostics}

\subsection{Scintillation probes}
\begin{refsection}


\GWisf{/Diagnostics/Radiation/ScintillationProbes/PhotoGallery/HXRScintprobes.jpg} 

A set of scintillation probes with various crystals is installed on the Golem tokamak i) NaI(Tl) 2"x2" N/A, ii)  YAP(Ce) 1"x1" Hamamatsu R6094, iii)  NaI(Tl) 2"x2" ET Enterprises 9266B, iv) CeBr3/YAP(Ce) 1"x1" Hamamatsu R3998-02, v) CeBr3/YAP(Ce) 1"x1" Hamamatsu R1234A and vi) LYSO.

\GWiss{/Diagnostics/Radiation/ScintillationProbes/PhotoGallery/39417Screenshot.png} 

Especially CeBr3 crystal were tested at the tGOLEM and then used at TCV and COMPASS  tokamaks, see
\vcite{CerovskyJINST22}.

In vessel RE probe proposal in the \vcite{DhyaniJINST19} and \vcite{DhyaniEPS19} contributions.
\printbibliography[heading=subbibliography]
\end{refsection}

\subsection{Strip detector}
To measure the spatial and velocity distribution of Runaways.
\GWisf{/Experiments/RunAwayElectronStudies/Diagnostics/Slides/StripDetector/DetectorOnFlanche.png} 
\GWiss{/Diagnostics/Radiation/StripDetector/Photogallery/39417Screenshot.png} 
\begin{refsection}

This issue have been covered in these articles: \vcite{SvihraFUSENGDES18}, \vcite{NovotnyJINST20} and \vcite{TunklMT22}.

\printbibliography[heading=subbibliography]
\end{refsection}


\subsection{ECE radiometer}
A 16-channel heterodyne radiometer capable of directly measuring the emission of low-energy Runaway electrons via electron cyclotron emission.
\begin{refsection}
\GWisf{/Diagnostics/Radiation/ECEradiometer/PhotoGallery/20230116_075212.jpg}
\GWiss{/Diagnostics/Radiation/ECEradiometer/PhotoGallery/39417Screenshot.png} 

Inspiration from the COMPASS tokamak installation and experimentation is in the \vcite{FarnikEPJ19} and \vcite{FarnikRSI19} publications.
\printbibliography[heading=subbibliography]
\end{refsection}



%\section{cosi}
\subsection{Timepix3}
\begin{refsection}

\subsubsection{Advacam variant}
\GWisf{Diagnostics/Radiation/Timepix/Advacam/PhotoGallery/22ComptonCamera}
\GWiss{/Diagnostics/Radiation/Timepix/Advacam/PhotoGallery/39417Screenshot.png} 

See \vcite{LinhartIEEE18} and \vcite{MalecIEEE21} articles. This is the first use of this detector on the Golem tokamak, and the results are summarized in the Štepán Malec diploma  thesis  \vcite{MalecMT23}



\subsubsection{Nikhef variant}
This diagnostics was tested at the tGOLEM without publication. Results from the COMPASS installation are summarized in the  \vcite{KulkovJINST22} paper.

\printbibliography[heading=subbibliography]
\end{refsection}






\section{Other possible RE relevant diagnostics/issues}
\begin{refsection}
\begin{itemize}
\setlength{\itemsep}{-5pt}
\item Some Runaway Electron Modeling:
\begin{itemize}
\setlength{\itemsep}{-5pt}
\item The simulation is being worked on radiation generation and transport in a simplified GOLEM tokamak model in the FLUKE systems (Jaroslav Čeřovský initiative for scintillation probes). 
\item Geant4 simulation toolkit and the models are used to simulate a RE interaction in the tokamak and with the strip detector \vcite{TunklMT22}.
\end{itemize} 
\item Magnetohydrodynamics, see \vcite{SaranchaJPCS21}, \vcite{MarkovicMT12}.
\GWisf{/Diagnostics/Magnetic/MHDringThomas/PhotoGallery/0412/CIMG9704.JPG} 
\GWiss{/Diagnostics/Magnetic/MHDringThomas/PhotoGallery/39417Screenshot.png} 
\item Isotopic studies, see \vcite{SaranchaPAST21}.
\item Tomography.
\GWisf{/Diagnostics/Radiation/FastCameras/FastCamMiniUX/PhotoGallery/DSCN1924.JPG} 
\GWiss{/Diagnostics/Radiation/FastCameras/FastCamMiniUX/PhotoGallery/39417Screenshot.png} 
\item Biasing electrode.
\GWisf{/Infrastructure/Tools/BiasingElectrode/PG/BiasingProbe.jpg} 
\GWiss{/Infrastructure/Tools/BiasingElectrode/PG/39417Screenshot.png} 
\item Possible working gasses: Hydrogen, Helium, Argon, Deuterium.
\item Foreseen diagnostics: i) Vertical and horizontal Bolometry, ii) A 32-channel high-resolution optical spectrometer capable of measuring ion temperature and plasma poloidal rotation rate.
\item {Preionization possible: i) cosmic rays, ii) electron gun/tungsten filament, iii) MW via magnetron 2.45 GHz}
\item Hypothetical diagnostics: 
\begin{itemize}
\setlength{\itemsep}{-5pt}
\item Cherenkov detector. This detector was used in the CASTOR era, see \vcite{VachaMT07}. Then an experimental campaign at the tokamak COMPASS is described in the  \vcite{CerovskyMT18}. There are some indications that we could agree with colleagues from Poland and try to implement the diagnostics again on this tokamak. 
\item Calorimeter, see installation at the COMPASS in the \vcite{CaloudMT20} . 
\end{itemize} 
\end{itemize} 

\printbibliography[heading=subbibliography]
\end{refsection}


\section{Possible comparative studies with tokamak COMPASS results}

\begin{refsection}
See \vcite{FickerNF17}, \vcite{CerovskyMT18}, \vcite{FickerMT15}, \vcite{VlainicPhD17}.
\printbibliography[heading=subbibliography]
\end{refsection}

\section{The team}

\subsection{The core (proposal)}

Honza Mlynář, Ondra Ficker a Eva Macúšová, Vojtěch Svoboda (chief engineer), Jana Brotánková, Daniel Mazur, Matěj Tomeš, David Břeň.

\subsection{Possible contributors and their roles}

\begin{itemize}
\setlength{\itemsep}{-5pt}
\item {\bf Scintillation probes:} Jaroslav Čeřovský (PhD student), Jakub Vinklárek (Bachelor student). Expected Bachelor project 2023 "Characterization of scintillation detectors at GOLEM tokamak for
Runaway electron studies").
\item {\bf Tomography:} Jan Mlynář, Sara Abbasi (Postdoc). Expected grant proposal at the Czech grant agency.
\item {\bf Strip Detector:} Marek Tunkl (PhD in the Joint program). 
\item {\bf Timepix detectors:} Štěpán Malec (Master student, 2023 PhD planned), Sergei Kulkov (PhD student).
\item {\bf ECE radiometer:} Vladislav Ivanov (PhD in the Joint program), , Michal Farník (PhD student).
\item {\bf MHD activity:} Jana Brotánková?, Vladislav Ivanov (PhD in the Joint program).
\item {\bf The supervisory role/coordination of the REs experiments @tGOLEM: } Vojtěch Svoboda, Lukáš Lobko (PhD in the Joint program).
\item {\bf Optical spectrometry: } Matěj Tomeš (IPP Prague).
\item {\bf Bolometry: } Probably only if we invited Jakub Svoboda to help us somehow with it.
\item {\bf Physics periscope: } Ondřej Ficker, Jan Mlynář, Evka Macúšová (IPP Prague).
\item {\bf Numerical modeling } Jaroslav Čeřovský, Marek Tunkl.
\item Other possible contributors: Roger Jasper? (Ghent University), Jan Čečrdle, nepojmenovaný doktorand ...?
\item ( ... Missing Honza St\"ockel.)
\end{itemize} 

Notes
\begin{itemize}
\setlength{\itemsep}{-5pt}\item Most here mentioned contributions are, besides the links, available \href{http://golem.fjfi.cvut.cz/wiki/Experiments/RunAwayElectronStudies/Library/}{here}.
\end{itemize} 


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