mm, relder, liberty, kaf, ebg Mike, Dick, Bob, Kathy and Gene, Below are tabulated some efficiency values from all the pre/post radiation X-GEF runs on proton-exposed gratings. Note that some of the "pre-exposure" tests have incomplete data sets on disk as we were aware; these are date codes: 001101, 001113, and 001114. Can the data be recovered from tape for these? I do not know of any further analysis plans; the data are available in various files in the /nfs/cenx3/d11/tgs/ directory and my notes are in ~dd/text/VSG/rad_test.txt . -Dan - - - - - Grating/Test Region 1 keV 4 keV 8 keV BarFrac/RectThick MA1025/010301 p0: 11.69 25.24 11.40 0.61/4213 MA1025/001207 p0: 11.09 25.16 11.54 0.61/4272 MA1026/010301 p0: 12.15 24.34 10.75 0.62/4066 MA1026/001116 p0: 12.08 24.19 10.68 0.62/4081 MB1148/010302 p0: 17.29 20.52 8.07 0.49/3353 MB1148/001117 p0: 17.08 20.90 8.27 0.49/3405 MB1158/010302 p0: 14.87 22.77 9.53 0.47/3901 MB1158/001117 p0: 14.75 22.92 9.57 0.47/3848 MA1022/010307 p0: 12.49 23.28 10.07 0.60/3929 MA1022/001116 p0: 12.46 23.48 10.19 0.60/3957 ME1409/010307 p0: 19.83 21.48 8.27 0.48/3286 ME1409/001127 p0: 20.35 21.49 8.23 0.48/3248 HC2214/010308 p0: 7.72 23.22 10.93 0.56/4477 HC2214/001101 p0: test not analyzed: missing data HC2214/960207 ave: 7.81 23.42 11.08 0.55/4558 HC2259/010308 p0: 5.33 27.15 15.51 0.55/5531 HC2259/001101 p0: test not analyzed: missing data HC2259/960307 ave: 5.46 26.17 14.63 0.56/5516 HB2104/010309 p0: 6.66 30.20 17.56 0.55/5725 HB2104/001113 p0: test not analyzed: missing data HB2104/960730 ave: 6.14 29.65 17.40 0.57/5714 HE2426/010309 p0: 4.11 18.51 9.52 0.59/4974 HE2426/001115 p0: 3.61 18.36 9.56 0.62/4774 HE2412/010312 p0: 5.82 25.93 14.24 0.57/5331 HE2412/001115 p0: 5.58 26.01 14.33 0.57/5346 HF2517/010312 p0: 8.33 25.20 12.00 0.57/4639 HF2517/001114 p0: test not analyzed: missing data HF2517/960428 ave: 7.95 24.80 12.00 0.55/4731 The top line in each set is the "after" measurement (as indicated by the date code under "Test"). Most of these results are for the central strip region "p0" of the gratings; MEGs are tested at 5 valid regions (m8,m4,p0,p4,p8); HEGs at 3 (m4,p0,p4). In the 4 cases where pre-exposure data are not complete, earlier (1996!) "ave:" values are shown for reference. The efficiency values tabulated are the values of the 1st order efficiency model which best fits the measured efficiency data points; 19 or so individual X-GEF measurements (0th, +/-1st, +/-2nd orders) go into the model fit. The "BarFrac" is an approximation to the grating bar 'duty cycle' in the bizzarre multi-vertex model bar shape, giving an idea of the line-to-period ratio for the shape. The "RectThick" is similarly an estimate of the 'average thickness' of the bar region of the model shape. ==========