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Current News

Status, May 24th, 2006
Detector Focus Shift Complete

The E2V 2kx2k 2.3m Imager has been at RSAA for the last 2 weeks and has undergone
a change in the nominal position of the CCD.

The detector has been moved forward in the dewar by 4.5mm.

This should provide the abilaity to focus the camera on the Echelle spectrograph.
A stand-off ring has also been provided so that the camera can still be focussed on
the Nasmyth platform and operated normally for this focal station.

The following image shows a 3600s dark exposure taken at -120C through the Left-hand
ouput amplifier. Similar data has been obtained in Split and Op(R) configurations.
All indications are that the Imager is operating nominally and is therefore being
returned to Siding Spring this weekend
for Bruce Peterson's run on the 31st May 2006

3600s Dark Exposure.

Imager CCD at T=-120C - Ouput Amp(L), JPG image of 3600s dark frame.

Output Amp(L) R/O 3600s Dark frame FITS data (9Mby).

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New Focus Posn. Pictures.

The detector itself was moved forward in the dewar - leaving the mechanical arrangement -
The Detector Mount Block (DMB) in place. To achieve this - 4 stand-offs were made and
these were fitted underneath the detectors PCB. This allowed the CCD surface to be moved
without resorting to making new mount block componenets.

A shim, of the same thickness (4.5mm) as the stand-offs, was also made to fill the gap
between the back of the detector and the surface of the DMB. All this can be seen in
the accompanying pictures.

1. Existing Arrangement before focus shift.

2. Components used to achive the shift in focus.

3. Position of PCB after stand-offs installed.

4. Detector mounted with mating shim to DMB.

5. Another view of detector and PCB.

6. View from side showing shim arrangement.

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E2V Detector now operating and set to be returned to Siding Spring.

Details relating to the present state of the Imager CCD contamination
may be found here

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The picture below illustrates the appearance of the new E2V (Dewar 6)
camera mounted at the Nasmyth focus of the 2.3m telescope.

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E2V 2048x2048, 13.5um pixel CCD for 2.3m Imager.

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The following table illustrates the performance characteristics for the new E2V 2kx2k direct Imager.

GAIN	CDS Gain	System Gain(e/adu)	Noise(e)	Bias(adu)
0	9.5	0.53	4	1190
1	4.75	1.1	3.6	1181
2	2	2.4	4.4	1166
3	1	5.6	6.8	1155

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Spectral Response Charcteristics

The following diagram illustrates the spectral performance characteristics for the new E2V 2kx2k direct Imager.

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Dark Current Frame

A 3000s dark frame showing the effects of cosmic ray events and the slight difference in bias level when performing a split-register read-out (the non-default read-out mode).

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Fringing in I Band Image

A frame taken in the I band showing the effects of fringing arising from multi-layer interference effects in the thinned, non-deep depleted CCD.

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Documentation Available

E2V 2.3m Imager Manual.
E2V 2.3m Hardware Modifications.
E2V CCCD for 2.3m Imager.

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Assembly & CCD Controller Hardware

1. Looking into dewar during construction showing LN2 can.

2. Detector mount block and Flex connectors.

3. Detector mount, PCB and Flex connectors.

4. Liquid Nitrogen can and cold strap mounting blocks.

5. Looking into dewar during construction.

6. Detector mount block and socket installed in dewar.

7. Detector mount block showing Flex Ccts and chip socket.

8. Front of dewar showing E2V CCD and 2 calibration LEDs.

9. Front of Dewar showing E2V CCD mounted at the focal plane.

10. Front of dewar showing E2V CCD and 2 calibration LEDs.

11. ARC Clock Generation Card.

12. ARC 250Mhz Fibre Optic Timing Card.

13. ARC Utility Card.

14. ARC dual channel Video processor Card.

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Enquiries about the 2.3m E2V Imager?
detman@mso.anu.edu.au

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