GLAST LAT project pitch adapter review

GLAST LAT Project Pitch Adapter Review, 20 January 2005 1 GLAST Large Area Telescope: GLAST Large Area Telescope: Pitch Adapter PWB Metrology Bill Craig, Charlie Young Stanford Linear Accelerator Center bcraig@slac.stanford.edu 650-926-2983 Gamma-ray Large Gamma-ray Large Area Space Area Space Telescope Telescope GLAST LAT Project Pitch Adapter Review, 20 January 2005 2 CMM Surface Scan Overview CMM Surface Scan Overview  6 parts were taken to LLNL for metrology – 4 parts, 2 of the -05 series, 2 of the -10 series.  Several non-contact methods attempted, none were successful at getting a good view of the whole radius  Performed dense CMM scan at 1mm steps in Z, 3mm of Y travel in 115 steps, 1.5mm probe radius.  Surface data shows features on few cm length scales with amplitude of 50 to 100 microns.  No apparent difference on surface plots between the older -05 series and the newer -010 series for the few parts tested GLAST LAT Project Pitch Adapter Review, 20 January 2005 3 Coordinate system for CMM scans Coordinate system for CMM scans Serial Number X=0 X=355 Y Z Boards were held flat by custom fixturing. IE 176 CMM GLAST LAT Project Pitch Adapter Review, 20 January 2005 4 Board 2100 Surface Board 2100 Surface GLAST LAT Project Pitch Adapter Review, 20 January 2005 5 Board 2146 Surface Board 2146 Surface GLAST LAT Project Pitch Adapter Review, 20 January 2005 6 Board 11312 Surface Board 11312 Surface GLAST LAT Project Pitch Adapter Review, 20 January 2005 7 Board 11314 Surface Board 11314 Surface GLAST LAT Project Pitch Adapter Review, 20 January 2005 8 CMM residuals CMM residuals  For each of the 4 boards, subtract a typical Y-Z plane trace from the surface.  Plot residuals to look for correlation length scales  On 3 of 4 evidence for ~10 cm length scale for variations, amplitude of 50 to 100 microns.  No apparent difference between -05 and -10 series GLAST LAT Project Pitch Adapter Review, 20 January 2005 9 Board 2100 Residuals Board 2100 Residuals Subtracted X scan [10] and smoothed with 2D 11 pixel width boxcar GLAST LAT Project Pitch Adapter Review, 20 January 2005 10 Board 2146 Residuals Board 2146 Residuals [...]... 4) Full arc 13 GLAST LAT Project Pitch Adapter Review, 20 January 2005 Board 2100 Radial Profile 14 GLAST LAT Project Pitch Adapter Review, 20 January 2005 Board 2146 Radial Profile 15 GLAST LAT Project Pitch Adapter Review, 20 January 2005 Board 11312 Radial Profile 16 GLAST LAT Project Pitch Adapter Review, 20 January 2005 Board 11314 Radial Profile 17 GLAST LAT Project Pitch Adapter Review, 20 January... Board to be sectioned at a broken trace as shown 21 GLAST LAT Project Pitch Adapter Review, 20 January 2005 45 degree sectioning of 1” lengths 22 GLAST LAT Project Pitch Adapter Review, 20 January 2005 Italian side CMM profile 23 GLAST LAT Project Pitch Adapter Review, 20 January 2005 Teledyne side CMM profilometery 24 GLAST LAT Project Pitch Adapter Review, 20 January 2005 Taylor-Hobson profilometery... 30 GLAST LAT Project Pitch Adapter Review, 20 January 2005 Board 2123 Radial Profile SLAC profilometer data -10 series board 31 GLAST LAT Project Pitch Adapter Review, 20 January 2005 Board 11127 Radial Profile SLAC profilometer data -05 series board 32 GLAST LAT Project Pitch Adapter Review, 20 January 2005 Board 11313 Radial Profile SLAC profilometer data -05 series board 33 GLAST LAT Project Pitch. .. for the sudden failure  18 GLAST LAT Project Pitch Adapter Review, 20 January 2005 Sectioning instructions    Diane Kolos at GSFC has boards and will do sectioning and SEM analysis Instructions written by C Young and sent to her on 13 January Status? 19 GLAST LAT Project Pitch Adapter Review, 20 January 2005 Pitch Adapter Geometry 20 GLAST LAT Project Pitch Adapter Review, 20 January 2005 Board... should correlate these findings against the spatial distribution of failures on the most recent Teledyne attempts 27 GLAST LAT Project Pitch Adapter Review, 20 January 2005 Board 2257 Radial Profile SLAC profilometer data -10 series board 28 GLAST LAT Project Pitch Adapter Review, 20 January 2005 Board 2057 Radial Profile SLAC profilometer data -10 series board 29 GLAST LAT Project Pitch Adapter Review, .. .GLAST LAT Project Pitch Adapter Review, 20 January 2005 Board 11312 Residuals 11 GLAST LAT Project Pitch Adapter Review, 20 January 2005 Board 11314 Residuals 12 GLAST LAT Project Pitch Adapter Review, 20 January 2005 Radial profiles  For each of 355 X scans, perform four 3 point radius determination... Board 11313 Radial Profile SLAC profilometer data -05 series board 33 GLAST LAT Project Pitch Adapter Review, 20 January 2005 Board 11317 Radial Profile SLAC profilometer data -05 series board 34 GLAST LAT Project Pitch Adapter Review, 20 January 2005 CMM profilometry Board 2132 35 GLAST LAT Project Pitch Adapter Review, 20 January 2005 CMM profilometry Board 2108 36 ... worth doing detailed correlation between failure sites and surface features 26 GLAST LAT Project Pitch Adapter Review, 20 January 2005 Summary    No obvious visual clues from most of the profilometry Some indication of differences in radial profile between the small number of -05 and -10 series boards profiled – More radial variation in the -05 series boards but generally flat radial profile as function... sections of the 2k series board Worst Peak to Peak 30 microns, mean is 10 microns Definitely periodic on few mm length scales (corresponds to tools marks visible on part under microscope) 25 GLAST LAT Project Pitch Adapter Review, 20 January 2005 Visual Inspection    Scanned ~5 boards of the 11k series that had been rejected for breaks Verified that breaks occurred in clumps – Few single breaks – Typical . 11312 Surface GLAST LAT Project Pitch Adapter Review, 20 January 2005 7 Board 11314 Surface Board 11314 Surface GLAST LAT Project Pitch Adapter Review, 20. width boxcar GLAST LAT Project Pitch Adapter Review, 20 January 2005 10 Board 2146 Residuals Board 2146 Residuals GLAST LAT Project Pitch Adapter Review, 20