Status And Performance

The integration of the cooling system was essentially complete one year ago (see Fig. 3). Before integrating the science array, it was tested intensively (flexure, leaks, spilling, LN2 flow, etc.). The results are very satisfying. The performance is well within the specifications with the mosaic reaching a temperature to within ±1 K even below the nominal operating temperature (128K for 155K specified). The hold time is ~40 hours.

We would like to thank everyone who gave us the opportunity to develop this system. Special thanks to Olaf Iwert who, as project manager of the detector system, put the necessary pressure on us to build a good and well optimized system. Thanks to Dietrich Baade who is responsible for OmegaCAM and head of the Optical Detector Team (ODT) and gave us his trust. Thanks to Jesper Thillerup who helped with the integration and supervised the development of the cooling controller by an external contractor, all other ODT staff. And last, but not least, Guy Hess who carefully designed the detector head.

[1] Iwert, O., et al., The OmegaCam 16K*16K CCD detector system for the ESO VST, these proceedings.

[2] Capaciolli, M. et al., 2002, Proc. SPIE, 4836, 43.

[3] Kuijken, K. et al., 2002, The ESO Messenger, 110, 15.

Figure 3. Cooling system.

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