\section{Verification}
\label{sec:verification}
All aspects of the instruments design need to testify if they fulfill the imposed requirements. In general parameters' verification is performed by comparing required reference values against dedicated values obtained by the instrument, mainly by review, analysis and/ or test.\\

The instrument team will summarize their findings in written reports and provide in to the prime for review.

All processes, components and materials are documented in various declared lists. \cite{dcl}, \cite{dpl}, \cite{dml}, \cite{dmpl}

\subsection{Mechanical Verification}
\label{sec:mech-verfification}
The structural machined parts of the instrument consist solely of materials selected from \cite{ecss-q-st-70-36c}, \textit{Table(s) 5-1}. Thus the verification of their basic mechanical properties is done by reviewing the corresponding supplier's conformance certificates. The applied machining techniques/ processes (conventional, CNC, etc..) are not additionally reviewed in the scope of the \acs{AHEPaM}-Project, since these processes are well established with a wide range of heritage in space projects.\\

All components used in the \acs{DM} will undergo at least one vibration test, as specified by the mission's requirements. The DM design is very close to a (hypothetical) FM design. Thus all components will be tested in a flight or flight-like configuration and will consequently be put under realistic stresses.\\

Materials that come with special characteristics or have not yet been used by the instrument team will undergo additional lab testing, depending on their nature.\\

Since \acs{ETPH} does not have a mechanical dynamics testing capabilities, vibration testing needs to take place in external facilities.

\subsection{Electronics' Verification}
\label{sec:el-verfification}
The design for the most noisy electronic parts, like main flyback converter and the secondary switching regulators for digital IO and FPGA core voltage, will use the same parts with similar circuitry as in previous missions like SolarOriter or LND. \\
Baseline for the new design of the HVPS is a current fed push pull oscillator. This a well-known circuit for HV generation for flight and successfully running on several mission. This is an oscillator which produces a sine wave on one frequency — no EMC disturbance expected.\\
The EMC and EMR requirements will be tested in an external test house, because ETPH does not have these testing capabilities. We have tested our electronic for previous mission at  TREO, a test facility very near CAU.


\subsection{Thermal Verification}
\label{sec:therm-verfification}
The type of thermal verification test applied to the unit depends on what aspect needs to be verified. \acs{ETPH} has different testing capabilities, both under ambient pressure and in vacuum. Both thermal cycling and thermal balancing tests can be conducted in our thermal-vacuum-chambers, depending on the size of the test unit. The details need to be worked out depending on the required test. The \acs{DM}-design will be accompanied where necessary by sub-assembly level thermal testing, e.g. the cherenkov detector/ \acs{PMT} setup, in order to debug the design and find potential flaws.\\

In case size constraints exceed \acs{ETPH}'s testing capabilities, there are various German test facilities available, where we have tested our components for past missions. (e.g. ZARM/ Bremen or MPS/ Göttingen).

\subsection{Detector Verification}
\subsubsection{Verification at CERN}


The verification of the electron proton separation shall be conducted at CERN where several GeV protons are available as well as highly relativistic electrons. In separate fields the instrument shall be irradiated with electrons and with protons to proof the ability of the instrument to distinguish between them. The expected signatures in the observation data shall be demonstrated.


\subsubsection{Verification at BNL}


BNL is one potential facility to calibrate the future flight units with heavy ions. This is not foreseen for the DM.

\subsubsection{Verification at HIMAC}


HIMAC is another potential facility to calibrate the future flight units with heavy ions. This is not foreseen for the DM.

\subsubsection{Verification with muons and Bi-207 at the Electronics Lab}
%\textbf{Jonas}
%Describe how we can use muons to test \ac{AHEPaM} in the lab. One short paragrph with a drawing of the sensor head.
The first step to validate and calibrate the measurement with the demo model can already be done in the electronics laboratory, even before it is brought to a particle accelerator facility. 

The muons from the Earth's atmosphere are available for this purpose, most of which are fast enough to generate Cherenkov light in the aerogel. From the estimated spectral directional flux of the muons, the response of the \ac{PMT} can be checked.

In order to roughly energy calibrate the voltage values from the ADCs at the silicon detectors, a well known $^{207}$Bi source is placed in the demo model.


%\begin{figure}
%    \centering
%   \includegraphics[width=\columnwidth]{}
%    \caption{Caption}
%    \label{fig:muons}
%\end{figure}

