Imaging subsystem for space science: WSO/UV imaging subsystem
e2v is providing a detection subsystem for the WSO-UV space mission, which is a major international collaboration with Russia in the leading role. This subsystem will enable scientists to study the Universe in ultraviolet wavelength (120-310nm).
- The flatness of the CCDs is 9.43 microns measured peak to valley.
- The enclosures maintain CCDs at -100 °C, while contributing no more than 3W heat into the cooling system.
- The noise performance is better than 3 e- at 50kHz pixel readout.
- The subsystem’s enclosures maintain ultra-high vacuum conditions for up to 9 years.
- The subsystem is fully qualified to survive launch while maintaining alignment.
The subsystem architecture:
- 3 cryostat enclosures are composed of a window, a cold finger, ION pump and getter pump with a CCD central support. Each cryostat contains a CCD.
- 3 CCDs 272 with three different Anti Reflection (AR) coating variants, which are optimised for different wavelengths. They feature high guaranteed QE below 200nm and high CTE Low Dark Current.
- 3 electronic drive modules.
- Cable harnesses connect the enclosures to the spacecraft cooling system.