XRT CCD basics

XRT CCD specification

• image area : 2048(H)x2052(V), pixel size: 13.5x13.5 μm
• serial register : 50+2048+50=2148 pix.(additional 50 pix at both ends).
• 3-phase device.
• non-MPP mode
  MPP: Multi-Pinned Phase : a technique to reduce dark noise in a CCD.
  reference 1 from a MSSL page 1
  reference 2 from a MSSL page 2
• camera gain: 59.1 + 0.026T(C) [electrons/12bitADU] at R-port
• dark current figure of merit : 0.4 [nA/cm^2]
• charge transfer efficiency (CTE):
  parallel transfer > 0.999996
  serial transfer > 0.999999 (-93C < T < -50C)

Image format

Dark patterns

dark current model
(from Kano et al., 2008, Solar Physics vol.249, p.269.)
(original reference: Janesick., 2000, "Scientific Charge-Coupled Devices", SPIE Bellingham.)