%info@http:://golem.fjfi.cvut.cz/wiki/root/GW4reports

\def\GWpar{
\label{sec:remote-discharge-setup}
The discharge setup procedure consists of several steps corresponding to the
tabs in the control room page. The
control page serves as a walk-through which guides the user through the setup
procedure. All settable parameters are perfectly safe. At each step the user selects a value of some numeric parameter
and/or a given option with a checkbox and then moves to the next step by clicking
the \textbf{Next} button. The description of the steps (tabs) follows:
\par
\begin{enumerate}
\item \textbf{Introduction:} This step only briefly describes the configuration
  procedure and shows the full engineering scheme and rendering of the GOLEM
  tokamak.
\item \textbf{Working gas:} In this step the pressure $p_{WG}$ (in mPa) and type
  (Hydrogen or Helium) of the neutral working
  gas from which the plasma forms is set. The working gas pressure must be high
  enough for any plasma to form, but low enough for the neutral gas to breakdown
  into plasma according to Pachen's law. The vacuum stand and working gas
  reservoirs with a system of valves responsible for maintaining the configured
  pressure in the vacuum vessel are shown in the engineering scheme and the 3D
  model rendering.
\item \textbf{Preionization:} The pre-ionization method (electron gun or no
  pre-ionization) is selected in this step.  Pre-ionization is necessary for any
  plasma to form. The neutral working gas must first be (partially) ionized in
  order to break down into a plasma. Using the electron gun will locally ionize
  the gas. Without any ionization, no plasma can form a a so called ``vacuum
  discharge'' (useful for calibration) will be executed. The approximate
  location of the electron gun and ionization sphere is shown in the engineering
  scheme and the 3D model rendering.
\item \textbf{Magnetic field:} In this step the voltage $U_{B_t}$ (in Volts) on the capacitors to be
  discharged into the toroidal field coils is set. The higher the voltage, the
  larger the magnetic field confining the plasma. The engineering scheme shows
  the equivalent electric circuit responsible for charging the capacitors and
  then discharging them into the coils. The 3D model rendering shows the magnetic
  field coil (gray casings) with current feeds (red and blue) and green toroidal magnetic field lines.
\item \textbf{Electric field:} In this step the voltage $U_{E_t}$ (in Volts) on the
  capacitors to be discharged into the primary transformer winding is set. The higher
  the voltage, the larger the electric field which breaks down the gas into a
  plasma and then induces a current in the plasma which continues to heat it. The engineering scheme shows
  the equivalent electric circuit responsible for charging the capacitors and
  then discharging them into the coils. The 3D model rendering shows the iron 
  transformer core (gray) and the primary winding (blue) and the electric field
  lines (light blue) induced by the transformer. With higher access levels the
  controls of the optional time delay between the discharging of the capacitors
  for the electric and magnetic fields.
\item \textbf{Submit:} The final step where the selected discharge configuration
  is submitted into the discharge requests queue along with a comment describing
  the configuration (i.e. the scientific aim). The comment is mandatory and must
  be put into the input field above the \textbf{Submit} button. Once the comment
  field is filled, clicking the \textbf{Submit} button will send the discharge
  request into the queue. After a successful submission a green alert box will
  appear below the Submit button and will show the request number and the
  estimated time to the execution of the requested discharge configuration. The
  panel also features button links to the Live real-time view of the experiment
  and the Introduction step to restart the walk-through. It is also possible to
  just go back to a specific step via the tabs at the top and change some
  parameters and then go back to the Submit step and submit the modified
  configuration. The 3D model rendering shows a view of the tokamak with a
  plasma.
\end{enumerate}}