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MOS2 CCD2 & CCD5 noise problems

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MOS2 CCD2 & CCD5 noise problems

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  1. MOS2 CCD2 & CCD5 noise problems Tony Abbey, Leicester University XMM Calibration/Ops Meeting Mallorca 1-3 Feb 2005

  2. Introduction • Alerted to changes in noise on MOS2 CCD2 and 5 by SSC/Ballet/Altieri et al • CCD2 – low energy spectral noise • CCD5 – strange flat spectrum with cut off at approx 1keV • Seems to be more frequent in later revolutions, although we had problems right from the start • This is work in progress………… XMM Calibration/Ops Meeting Mallorca 1-3 Feb 2005

  3. Spectral comparison of CCD5 and CCD4 on rev 891 (Ballet/Ceballos) XMM Calibration/Ops Meeting Mallorca 1-3 Feb 2005

  4. Back in the early days – rev 23 – bad noise often on CCD2 until reset voltage tweaked.Note column noise on CCD4 and general extra brightness on CCD5 XMM Calibration/Ops Meeting Mallorca 1-3 Feb 2005

  5. Revs 1-199 animation Click on e:\xmm_ccd_images\mos2_animated_1-199_16col.gif XMM Calibration/Ops Meeting Mallorca 1-3 Feb 2005

  6. Rev 23 noise does not have the spectral cut-off of the later occurrences such as rev 885 XMM Calibration/Ops Meeting Mallorca 1-3 Feb 2005

  7. MOS2 focal plane view rev 880 ccd2 noisy -> <- ccd5 quiet XMM Calibration/Ops Meeting Mallorca 1-3 Feb 2005

  8. MOS2 focal plane view rev 885 ccd2 normal -> <- ccd5 noisy(ish) XMM Calibration/Ops Meeting Mallorca 1-3 Feb 2005

  9. CCD2&5 spectral comparison rev 880 XMM Calibration/Ops Meeting Mallorca 1-3 Feb 2005

  10. CCD2&5 Spectral comparison rev 885 XMM Calibration/Ops Meeting Mallorca 1-3 Feb 2005

  11. Rev 885 CCD5 Events < 250DN XMM Calibration/Ops Meeting Mallorca 1-3 Feb 2005

  12. CCD5 noise distribution885 - 0203720201m2002 Areas of 150 rows high and ditto for 150 columns wide XMM Calibration/Ops Meeting Mallorca 1-3 Feb 2005

  13. CCD5 First 2 columns – rev 885 XMM Calibration/Ops Meeting Mallorca 1-3 Feb 2005

  14. What to do next? • Do we want to try moving some clock voltages around? • Open to the floor for suggestions XMM Calibration/Ops Meeting Mallorca 1-3 Feb 2005