Clio2 User Manual
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Detector
The detector for Clio as of April 2010 is a HAWAII-1 HgCdTe array. We use two quadrants of the array to give a 512×1024 FOV. Pixels are 18.5 microns on a side.
Operational Parameters
Detector Parameters
The detector gain is 4.9 e-/dn.
At the MMT, the temperature settles to 75.6 K on the detector, and the bias is 3700 dn (measured 101021).
The approximate saturation level is 55,000 dn.
This indicates that the full well capacity of the array is 51,000 dn or 250,000 e-
The read noise for a single frame is 19 dn or 93 e- (measured 101020).
Detector characterization
Need flats at M, L, and K
Bad pixel mask
This is a minimal mask that rejects the nonsensitive areas of the Clio2 detector.
Need nonlinearity equation or estimate.
Minimum Integration Time
The minimum integration times are the following:
| Format | Array Size | Minimum | Max Coadds |
|---|---|---|---|
| Full array | (512×1024) | 280 ms | 20 |
| Strip | (300×1024) | 164 ms | 40 |
| Stamp | (200×400) | 43 ms | 100 |
Duty Cycle
The dead time for an exposure is approximately 262 msec. This would give an expected efficiency of 50% for a minimum integration time of 262.
Measured efficiency.
Dark Current
The dark current is 50 dn/s or 245 e-/s at 75.9 K (measured 101020).
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