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Performance requirements
The 3DEES instrument

The specifications of the 3DEES include the following  Performance requirements:


Specific assessment strategy
PR1, PR2, PR3
Power consumption
Advances in component miniaturisation (including FEE ASIC, multichannel ADC, etc...), digital filtering techniques and high performance DC-DC converters suggest that these requirements are within the reach of technologies.
PR4, PR5, PR6
Energy measurement range
Energy resolution
Energy accuracy
New charged particle detection concepts allow that the 0.1 – 7 MeV energy range can be covered by a single compact instrument, with positive impacts on PR1, PR2 and PR3.
The final energy resolution/accuracy will be derived from the requirements on data, but 16 channels can readily be implemented.
PR7, PR8, PR9, PR10
Angular resolution
Angular binning
Angular coverage
3D coverage
Higher angular resolution (<5 degrees) has positive impact on particle discrimination capabilities. Optimised collimators are believed to provide the required angular resolution.
The final number of angular channels will be derived from simulation of angular distribution extraction from counts, but 18 is assumed to be a minimum (the 18 polar angle channels will possibly be at different azimuthal angles)
Electron detection rate
Non-paralysable instruments actually loose or mis-classify particles due to pile-up. In order to provide the instrument with capabilities to detect up to 109 /(cm² s), the pile-up issue will be addressed by investigating algorithm to extract individual pulse amplitudes from piled-up signals. A workaround to the pile-up issue would be to use small area front sensors (small geometrical factor) for GTO.
PR12, PR13, PR14, PR15
Purity of electron channels
Time resolution
Instrument lifetime
Target orbit
As mentioned above, reduction of F.O.V angle improves particle discrimination in particle telescopes, by reduction of the variance on the path length. Thereby, search for high angular resolution will lead to improved particle discrimination capabilities so as to expect <10% contamination of electron spectra.

The 3DEES will also be made compliant with specific Functional requirements.