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Some thoughts on Instrumental Techniques

Some thoughts on Instrumental Techniques. F. Scott Porter X-ray Astrophysics Branch NASA/GSFC. Boundary Conditions: (largely TBD) Power (low) Power source??? Mass (low) Telemetry (low) Good ergonomics large temperature extremes. In this box we want:

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Some thoughts on Instrumental Techniques

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  1. Some thoughts on Instrumental Techniques F. Scott Porter X-ray Astrophysics Branch NASA/GSFC

  2. Boundary Conditions: (largely TBD) • Power (low) • Power source??? • Mass (low) • Telemetry (low) • Good ergonomics • large temperature extremes • In this box we want: • Best spectral resolution possible • Large grasp: FOV x Eff. Area • Some spatial resolution • Long lifetime • Reasonable duty cycle

  3. What we really want:

  4. Technology choices

  5. Proportional Counters (including GEMs) • Large area (several 100 cm2 possible) • low energy threshold (with thin windows)

  6. Solid State detector • One readout node/channel • Requires cooling

  7. CCDs: Area = 44 cm2*QE For 10 deg collimation ==> AΩ = 0.11 cm2 str @ O VII EPIC/MOS CCD on XMM/Newton

  8. Charge exchange in the laboratory:

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