C1XS is an X-ray spectrometer comprising 24 Swept Charge Device (SCD) detectors and a precision 6 mm collimator/filter assembly. The detectors are arranged in three (2 x 4) arrays of 8 detectors each, providing an overall 28 by 28 degree Field-Of-View in the 0.8-20keV range with a resolution of 85 eV at 1.25 keV.  The SCDs are based upon CCD technology, but have a significantly lower readout noise and can also operate at higher temperatures than standard X-ray CCDs (The C1XS SCDs will operate with good signal-to-noise at -10 degrees Celsius).  This is achieved by an electrode and clocking arrangement that continuously 'sweeps' the charge to an amplifier at one corner of the chip. The instrument is from Rutherford Appleton Laboratory, UK.

An X-ray Solar Monitor (XSM) supports the C1XS observations, providing calibration solar spectra for the lunar data collected by C1XS from which absolute elemental abundances can then be derived. XSM has a wide 104 degree field-of-view and operates in the 1.2-20keV
range with a resolution of 200 eV at 5.9 keV. Stand-alone observations of long-term solar X-ray emission will also be made.  The detector comprises a silicon PIN diode cooled by a
Peltier element. The instument is from Oxford Instruments, Finland, Observatory of the
University of Helsinki and Rutherford Appleton Laboratory, UK.

• Browse C1XS FTP Directory
• Read C1XS Instrument Catalog
• Download C1XS EAICD

SIR (Sub Infrared Spectrometer) is a miniaturised point-spectrometer with a novel InGaAs array detector, designed to provide good signal to noise at temperatures of around -70 degrees Celsius.  The spectrometer operates in the 0.9-2.4 micrometer wavelength range and has 256 spectral channels with a resolution per channel of 6nm/pixel. This is coupled to a lightweight off-axis telescope, which has an aperture of 70mm and a field of view of 1.1mrad. A dedicated radiator provides passive cooling of the optics and the spectrometer during observations. The instument is from Max Planck Institute for Solar system science, Germany.

• Browse SIR-2 FTP Directory
• Read SIR-2 Instrument Catalog
• Download SIR-2 EAICD