Improving the X-IFU count rate capability through defocussing

Defocussing of the Athena optics is now a requirement and can be considered in evaluating the count rate performance of the X-IFU. Defocussing spreads the source counts over a large number of pixels (1000). Each pixel can sustain a count rate of the order of 40-50 cps. A Crab like source would produce about 90 000 cps over the full TES array. Therefore it is obvious that with defocussing, the X-IFU is capable of observing bright point sources. [caption id="attachment_770" align="aligncenter" width="300"] Broad band (0.2-12 keV) high resolution and total throughputs[/caption] High throughput for mid and high resolution events (spectral resolution less than 10 eV) is certainly required around the Iron like between 5 and 8 keV. The use of Be filters would remove a large fraction of the soft photons and therefore reduce the overall count rate of point sources while preserving the interesting events above 5 keV. The X-IFU can achieve throughputs as high as 70% with maximum defocussing and the use of Be filter. The above number will reduce (by a few 10% at 1 Crab) if events affected by cross talk are removed. [caption id="attachment_771" align="aligncenter" width="300"] The high+mid resolution event fraction in the 5-8 keV band.[/caption] The figures shown above are courtesy of Philippe Peille (December 2016), on behalf of the end-to-end simulator team.

Release of the January 2017 issue of the X-IFU Gazette

Thanks to Françoise Douchin, on behalf of the editorial team, I am please to announce the release of the January 2017 issue of the X-IFU Gazette. Enjoy the reading. Don't hesitate to provide feedback to Françoise on the content of the X-IFU Gazette. Best regards, Françoise and Didier

Best wishes for 2017

On behalf of the X-IFU consortium, we would like to wish you a happy, healthy and peaceful New Year.We are clearly living through difficult times, so developing education, promoting culture and improving human knowledge should remain priorities for those intending to make our Earth a better place to live in. This is why your contribution to the development of the X-IFU is also important, as it will eventually lead to breakthroughs in our understanding of the whole Universe. All the best and best regards,Didier and Thien

Team calendar

In order to keep you posted on what is going on in the X-IFU Consortium, check this TeamUp link here and bookmark it.