From dsd@pikaia Fri Jan 24 10:45:12 1997 Received: from pikaia.mit.edu by wiwaxia AA12392; Fri, 24 Jan 97 10:45:12 EST Received: by pikaia AA04053; Fri, 24 Jan 97 10:45:11 EST Date: Fri, 24 Jan 97 10:45:11 EST From: David Davis To: dd@pikaia, dph@pikaia, hermanm@pikaia, wise@pikaia Subject: Preliminary grating eff HETG Status: R Here's the first pass at the grating efficencies for the HETG Suite 29 Grating Eff Notes: The first measurement of the individual suites was done incorrectly at the 0 order, so for instance Suite 29.004 should have started with the HETG +4 order, the actual sequence is 0,+5,+6,+7,-4,-5,-6,-7. Suite 29.005 is 0,0,+1? Suite 29.003-4 HETG Fe Ka (6.4 keV) Focal Plane - no grating SSD 5543.25 +/- 13.89 cts/s SSD_5 6.50 +/- 0.08 cts/s/cm^2 HETG Order Efficiency (%) Predicted Eff (%) Eff/Pred_eff 0 7.8 +1 Zero Order 8.88 -1 8.64 8.81 0.98 +2 0.42 0.51 0.82 -2 0.40 0.54 0.77 +3 0.36 0.53 0.68 -3 0.37 0.52 0.71 +4 zero order done 0.19 -4 0.13 0.17 0.77 +5 0.04 0.11 0.36 -5 0.04 0.10 0.40 +6 0.029 0.066 0.44 -6 0.026 0.062 0.42 +7 0.008 0.033 0.24 -7 0.009 0.034 0.27