Troubleshooting guide

I. FLAMINGOS + KPNO 4-m Overview
FLAMINGOS is the FLoridA Multi-object Imaging Near-ir Grism Observational Spectrometer. This manual
provides the user with a good portion of the tools needed to successfully take data with FLAMINGOS at the
KPNO 4-m telescope. A knowledge of basic unix commands is assumed.
FLAMINGOS is comprised of two cryogenic dewars. The MOS dewar, closest to the telescope backplane,
contains a wheel which can position 11 slit plates in the Cassegrain focal plane. The Camera dewar,
immediately following the MOS dewar, contains all of the powered optics, filters, stops, grisms, and the
detector array. A functional diagram showing the relative layout and connections to the various electronics is
shown in Figure 1.
Array: Hawaii II 2048×2048 HgCdTe science grade array, divided into four quadrants with 8
amplifiers each (32 amplifiers for the whole array).
Linearity at 1.0V bias: 0.5% non-linear at 25,000 ADU
2.0% non-linear at 35,000 ADU
> 3% non-linear at 40,000 ADU
S' = 1.00425 S – 1.01413×10
-6
S
2
+ 4.18096×10
-11
S
3
(Anthony Gonzalez, UF)
IRLINCOR coefficients: A = 1.00425 B = -0.03323 C = 0.04489
Plate Scale and Field of View: 0.316 arcsec/pixel
10.8 arcmin FOV
Typical image quality (FWHM) = 2–3 pixels = 0.63 – 0.95 arcsec.
Detector Characteristics
Imaging Spectroscopy
Bias Voltage (Volts) 1.0 0.75
Full Well (ADU) ~50,000 ~38,000
Target Count level (ADU) 25,000 – 35,000 15,000 – 20,000
CDS Read Noise without
Differential Amplifier (e)
~40 ~40
Gain (e / ADU) ~4.9 ~4.1
NOTE: The default bias on boot of the MCE4 array controller is 0.776 V, which is not used in any observing
configuration; the initialization script initflam.pl automatically sets the bias to 1.0 V for imaging, but queries the
user if they wish to change the bias.
Filters: J, H, K, Ks, JH (0.9 μm – 1.8 μm), and HK (1.25 μm – 2.5 μm) bandpass filters.
Grisms: Two grisms are available, covering the JH (0.9 μm – 1.8 μm) and HK (1.25 μm – 2.5 μm) bandpasses.
The HK grism may be used with the HK filter to obtain H and K band spectra in first order, or it may be used
with the JH filter to obtain H band in first order, and J band in second order. For spectra in the K band only, the
K or Ks filter may be used to reduce the background.
Long Slits: 2, 3, 6, 9, 12, and 20-pixel slits are available; the 3 and 6 pixel slits cover much of the chip but the
others slits cover approximately two-thirds of the chip. All of these long slits are located on the MOS wheel.
An extra 3-pixel long slit is usually installed in one of the 11 MOS positions.
FLAMINGOS@4-m, Ver. 2.39, 2013 April 23 Page 3 of 47