; ; This document describes the HESSI shutter design. It also includes a full description ; of all materials in the x-ray path starting at the outermost thermal blankets ; around the collimator tube, to the thermal blankets under the collimator, the beryllium ; windows within and outside the cryostat. ; ;The following is the data structure used to describe all of the elements in the X-ray path. ;The thickness units default is 'cm', although 'mils' is most commonly used. ;Presently, only 'mils' is recognized as an alternative to a blank string. ;The id tag means, 0- fixed in path, 1- part of shutter_10, 2-part of shutter_01. ; ;hessi_win = { hessi_win, fraction:fltarr(4), regions:intarr(4), layers: intarr(2), $ ; thickness: fltarr(2), units:'', z:0, id:0} ; Define the fractional areas of 4 regions defining the X-ray path cross-section. ; These are the fractional values seen in the lines defining the material in each layer and segment. 0.9004, .096, 0.003, 0.0006 ;frac1, frac2, frac3, frac4 ; Top of Cryostat ; Kapton sheet, all regions, 1 sheet, 3-5 Mil thick, plastic (carbon). frac1, frac2, frac3, frac4, 1, 1, 1, 1, 12, 20, 5.48e-4, 10.96e-4, gmcm2, 6, 0 frac1, frac2, frac3, frac4, 1, 1, 1, 1, 12, 20, 2.92e-4, 5.84e-4, gmcm2, 8, 0 ; Top Blankets, all regions, 5-12 layers of 0.25-0.5 mil mylar, 200 Angstrom Al per layer. frac1, frac2, frac3, frac4, 1, 1, 1, 1, 5, 12, 5.48e-4, 10.96e-4, gmcm2, 6, 0 frac1, frac2, frac3, frac4, 1, 1, 1, 1, 5, 12, 2.92e-4, 5.84e-4, gmcm2, 8, 0 frac1, frac2, frac3, frac4, 1, 1, 1, 1, 5, 12, .540e-5, 1.08e-5, gmcm2, 13, 0 ; Top Blankets Netting, 5-12 layers of 0.3 mil mylar frac1, frac2, frac3, frac4, 1, 1, 1, 1, 5, 12, 6.6e-4, 6.6e-4, gmcm2, 6, 0 frac1, frac2, frac3, frac4, 1, 1, 1, 1, 5, 12, 3.5e-4, 3.5e-4, gmcm2, 8, 0 ; Bottom of Cryostat ; Bottom Kapton sheet, all regions, 1 sheet, 3-5 Mil thick, plastic (carbon). frac1, frac2, frac3, frac4, 1, 1, 1, 1, 12, 20, 5.48e-4, 10.96e-4, gmcm2, 6, 0 frac1, frac2, frac3, frac4, 1, 1, 1, 1, 12, 20, 2.92e-4, 5.84e-4, gmcm2, 8, 0 ; Bottom Blankets, all regions, 5-12 layers of 0.25-0.5 mil mylar, 200 Angstrom Al per layer. frac1, frac2, frac3, frac4, 1, 1, 1, 1, 5, 12, 5.48e-4, 10.96e-4, gmcm2, 6, 0 frac1, frac2, frac3, frac4, 1, 1, 1, 1, 5, 12, 2.92e-4, 5.84e-4, gmcm2, 8, 0 frac1, frac2, frac3, frac4, 1, 1, 1, 1, 5, 12, .540e-5, 1.08e-5, gmcm2, 13, 0 ; Bottom Blankets Netting, 5-12 layers of 0.3 mil mylar frac1, frac2, frac3, frac4, 1, 1, 1, 1, 5, 12, 6.6e-4, 6.6e-4, gmcm2, 6, 0 frac1, frac2, frac3, frac4, 1, 1, 1, 1, 5, 12, 3.5e-4, 3.5e-4, gmcm2, 8, 0 ;Shutters ;No Shutter substrates, all regions, 0 layers of 0 mil carbon fibers. ;Shutter 10, Thin shutter, 1st region covered, 2nd region open, 3rd region covered, 4th region closed. ;1st region- 10 mils al 0.9004, .096, 0.003, 0.0006, Ti has 8 times the stopping power/cm at 15 keV compared to Al frac1, frac2, frac3, frac4, 1, 0, 0, 0, 1, 1, 15.,15., mils, 13, 1 ;2nd region frac1, frac2, frac3, frac4, 0, 1, 0, 0, 1, 1, 40.,40.., mils, 13, 1 ;3rd region- 0.5 mils Al frac1, frac2, frac3, frac4, 0, 0, 1, 0, 1, 1, 1, 1, mils, 13, 1 ;4th region- 0.5 mils Al frac1, frac2, frac3, frac4, 0, 0, 0, 1, 1, 1, 2.5, 2.5, mils, 13, 1 ;Shutter 01, Thick shutter, 1st region covered, 2nd region covered, 3rd region open, 4th region open. ;1st region- 10 mils Ti frac1, frac2, frac3, frac4, 1, 0, 0, 0, 1, 1, 60, 60, mils, 13, 2 ;2nd region- 5 mils ti frac1, frac2, frac3, frac4, 0, 1, 0, 0, 1, 1, 15,15, mils, 13, 2 ;3rd region- 5 mils Al frac1, frac2, frac3, frac4, 0, 0, 1, 0, 1, 1, 10, 10, mils, 13, 2 ;4th region- 2 mils Al frac1, frac2, frac3, frac4, 0, 0, 0, 1, 1, 1, 1.5, 1.5, mils, 13, 2 ;Cryostat windows, all regions, 20 mil entrance window + 10 mil can window + two 5 mil internal thermal barriers of Be. frac1, frac2, frac3, frac4, 1, 1, 1, 1, 1, 1, 40., 40., mils, 4, 0 ;Cryostat mylar, all regions, 10-15 layers of 0.25-0.5 mil mylar, 200 Angstrom Al per layer. frac1, frac2, frac3, frac4, 1, 1, 1, 1, 10, 15, 5.48e-4, 10.96e-4, gmcm2, 6, 0 frac1, frac2, frac3, frac4, 1, 1, 1, 1, 10, 15, 2.92e-4, 5.84e-4, gmcm2, 8, 0 frac1, frac2, frac3, frac4, 1, 1, 1, 1, 10, 15, .540e-5, 1.08e-5, gmcm2, 13, 0 ; Bottom Blankets Netting, 10-15 layers of 0.3 mil mylar frac1, frac2, frac3, frac4, 1, 1, 1, 1, 10, 15, 6.6e-4, 6.6e-4, gmcm2, 6, 0 frac1, frac2, frac3, frac4, 1, 1, 1, 1, 10, 15, 3.5e-4, 3.5e-4, gmcm2, 8, 0