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Sudden jumps in the absolute energy scale and their origin

Sudden jumps in the absolute energy scale and their origin. FF Mn-K Pos Quadrant 0. ± 5 eV. Effect of the particle background. FF Mn-K Pos Quadrant 0. + 41.5 eV. ± 5 eV. 2005 Dec 20 – 2006 Jan 01. FF AL-K Pos Quadrant 0. ± 5 eV. + 10.5 eV.

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Sudden jumps in the absolute energy scale and their origin

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  1. Sudden jumps in the absolute energy scale and their origin EPIC pn: Jumps in the energy scale

  2. FF Mn-K Pos Quadrant 0 ± 5 eV EPIC pn: Jumps in the energy scale

  3. Effect of the particle background EPIC pn: Jumps in the energy scale

  4. FF Mn-K Pos Quadrant 0 + 41.5 eV ± 5 eV 2005 Dec 20 – 2006 Jan 01 EPIC pn: Jumps in the energy scale

  5. FF AL-K Pos Quadrant 0 ± 5 eV + 10.5 eV 2005 Dec 20 – 2006 Jan 01 EPIC pn: Jumps in the energy scale

  6. Al-K: 1.486 keV, +10.5 eV  +0.707% Mn-K: 5.894 keV, +41.5 eV  +0.704%  Change in the gain, not in the offset EPIC pn: Jumps in the energy scale

  7. low background high background Energy resolution somewhat improved during high background • reduced charge loss noise  reduced charge loss • increased trap saturation Energy shift occurs also for first singles • precursors ‘invisible’ • precursors below lower threshold or in preceding frame(s) EPIC pn: Jumps in the energy scale

  8. The CTI during low and high background rev 709, low background Al-K Mn-K  decreased CTI during high background (Mn-K) rev 711, high background Al-K Mn-K EPIC pn: Jumps in the energy scale

  9. low background EPIC pn: Jumps in the energy scale

  10. high background EPIC pn: Jumps in the energy scale

  11. During episodes of high particle background the CTI is reduced. • This is most likely caused by saturation of traps due to precursors. • The charge of the precursors is below the 20 adu threshold and thus not available. • The usual CTI correction cannot be used. • But there may be a correlation with the background flux which can be used for the correction.. EPIC pn: Jumps in the energy scale

  12. Effect of the quadrant box temperature EPIC pn: Jumps in the energy scale

  13. Gain/temperature correlation: earlier investigations EPIC pn: Jumps in the energy scale

  14. Mn-Kα & Al-K position and quadrant box temperature EPIC pn: Jumps in the energy scale

  15. Quadrant box temperatures (yellow circles: no FF mode) EPIC pn: Jumps in the energy scale

  16. Mn-Kα position vs. temperature: CCD 1 & 2 EPIC pn: Jumps in the energy scale

  17. Mn-Kα position vs. temperature: CCD 3 & 4 EPIC pn: Jumps in the energy scale

  18. Mn-Kα position vs. temperature: CCD 5 & 6 EPIC pn: Jumps in the energy scale

  19. Mn-Kα position vs. temperature: CCD 7 & 8 EPIC pn: Jumps in the energy scale

  20. Mn-Kα position vs. temperature: CCD 9 & 10 EPIC pn: Jumps in the energy scale

  21. Mn-Kα position vs. temperature: CCD 11 & 12 EPIC pn: Jumps in the energy scale

  22. Mn-Kα position vs. Al-K position EPIC pn: Jumps in the energy scale

  23. Deviations of the Al-K and Mn-Kα positions EPIC pn: Jumps in the energy scale

  24. Mn-Kα position vs. Al-K position EPIC pn: Jumps in the energy scale

  25. Mn-Kα positions (after gain and CTI correction) EPIC pn: Jumps in the energy scale

  26. Mn-Kα positions after temperature (and dCTI/dt) correction EPIC pn: Jumps in the energy scale

  27. “CCD offsets” EPIC pn: Jumps in the energy scale

  28. Quadrant box temperatures Doy 2000 EPIC pn: Jumps in the energy scale

  29. EPIC pn: Jumps in the energy scale

  30. EPIC pn: Jumps in the energy scale

  31. Standard correction EPIC pn: Jumps in the energy scale

  32. with 1 adu / 2000 d drop EPIC pn: Jumps in the energy scale

  33. with 1 adu / 2000 d drop EPIC pn: Jumps in the energy scale

  34. Mn-Kα position [adu] (in quadrant 0, after 1 adu / 2000 d drop) slope: +0.43 adu / C Mean quadrant box temperature [C] (F1576..F1876) EPIC pn: Jumps in the energy scale

  35. standard correction EPIC pn: Jumps in the energy scale

  36. after temperature.. correction EPIC pn: Jumps in the energy scale

  37. standard correction EPIC pn: Jumps in the energy scale

  38. after temperature.. correction EPIC pn: Jumps in the energy scale

  39. Multiply all energies with a factor F: F = ( 1 - A(t) - B(Tq) ) C A = 4.24 *10-7 (t-t0)/[d] B = 3.65 * 10-4 Tq/[oC] C = 1.0057 t0 : 2000-Jan-01 Tq: mean of T(F1576)..T(F1876) EPIC pn: Jumps in the energy scale

  40. EPIC pn: Jumps in the energy scale

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