©Anglo-Australian Observatory 1998, PO Box 296, Epping
NSW 1710 Australia
THE LARGE FORMAT 2Kx4K PIXEL DEVICES
The following pages contain information on the AAO's commissioned devices
from the MIT/Lincoln Labs/University if Hawaii large format detector consortium,
and form EEV.
The MITLL3 is available for common use on Taurus, UCLES, UHRF and RGO Spectrograph.
MITLL3 - Deep Depletion Device
MITLL3 has been returned to service - 28 August
EEV2 - A blue sensitive 2Kx4K EEV CCD is also available.
MITLL2A - Lumogen coated Epitaxial Silicon (post-Mar
MITLL2A is no longer offered - 28 August 2002.
MITLL2- Lumogen coated Epitaxial Silicon (pre-Mar
|August 2002 - MITLL3 and MITLL2a suffered failures in 2002A.
MITLL3 has been repaied and returned to service. MITLL2A cannot be repaired
and is no longer offered.
March 2000 - MITLL2 suffered a catastrophic failure in January
2000. This was due to a design flaw in our Oxford Instruments dewars, which
saw weakened dewar support struts chew Al shavings from the dewar wall.
These worked their way throughout the dewar, and appear to have enventually
damaged the on-chip amplifier then in use.
In March 2000, the chip was returned to Epping, where John Barton swapped
its operation to the other amplifier. From this date forward the device
was known as MITLL2A. As of April 6, it has successfully been used
on UCLES. See the MITLL2A page for further information.
UHRF and UCLES Observers must note that dark-current levels which
have been observed at the telescope may compromise their observations of
faint targets, unless their detector can be mounted well in advance of
their run. The AAO will make every effort to ensure this is done. Nonethless,
observers are strongly advised to read the following report.
The page on Serial Links contains some information
on the serial links used to transfer data between the CCD Controllers out
on the telescope and the Large External Memory (XMEM) which composes the
images for you. Because of the huge data rates required move these 0.3Gbit
images in a reasonable amount of time, they revealed shortcomings in our
"copper" serial links. In particular NONASTRO speed is not available unless
one of the new optical fibre links is used.
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Chris Tinney, MITLL Project Scientist firstname.lastname@example.org