Reflectivity and polarization sensitivity of a bent crystal with DLC deposition

Details Reflectivity and polarization sensitivity of a bent crystal with DLC deposition Reflectivity and polarization sensitivity of a bent crystal with DLC deposition

Jul 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010spie.7732e.151i&link_type=abstract

Space Telescopes and Instrumentation 2010: Ultraviolet to Gamma Ray. Edited by Arnaud, Monique; Murray, Stephen S.; Takahashi,

Physics

Optics

Scientific paper

We report a development of a bent crystal for use of X-ray polarimeter. A Si(100) crystal sheet was deposited with DLC (Diamond-Like Carbon) and bent by the difference in the internal stress between the DLC and Si. An angular reflectivity of the crystal was measured at 8 keV (Cu-Kα). The center of the reflection peak appeared at the Bragg angle expected for the (400) plane of Si(100). With the bending of the crystal, the angular width of the peak is broadened. A sample indicated the angular width of 2 degree, which is equivalent to the energy width of 0.5 keV. The modulation factor was measured to be more than 0.9 for 8 keV energy emission. If the energy of the X-ray emission is at Fe-K lines (~7 keV), which are very important for X-ray astronomy, the Bragg angle becomes more close to 45 degree. It means that higher sensitivity for the polarization would be expected for these lines. The sensitivity in wide energy band with the high modulation factor indicates that the bent crystal can be a new tool for the X-ray polarimeter. A preliminary design of the polarimetric optics composed by the Si(100) crystal and a small-size detector (e.g. X-ray CCD camera) is proposed. For celestial objects with large spatial extent with large emitting energy band, our optics could collect X-rays much more efficiently than existing optics with high signal to noise ratio. Any kind of crystals can be bent with our method, and then a combination of different crystals will further improve the performance of the polarimetric optics.

Affiliated with

Also associated with

No associations

Rating

Reflectivity and polarization sensitivity of a bent crystal with DLC deposition does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Reflectivity and polarization sensitivity of a bent crystal with DLC deposition, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Reflectivity and polarization sensitivity of a bent crystal with DLC deposition will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1375674