;
; 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.
;
; Here is an email from April 1999 from Paul Turin on the mylar in the X-ray path within the cryostat.

;Richard,
;I think I finally have the correct cryostat blanket info. Blanketing in
;front of the detectors is as following (going in the direction of X-ray
;travel):
;
;Outer shield blankets:
;
;1-mil mylar, VDA 1 side
;1/4-mil mylar, VDA 2 sides
;1/4-mil mylar, VDA 2 sides
;
;1/4-mil mylar, VDA 2 sides
;1/4-mil mylar, VDA 2 sides
;
;1/4-mil mylar, VDA 2 sides
;1-mil mylar, VDA 1 side
;                                                                                  
;Inner shield blanket:
;
;1-mil mylar, VDA 1 side
;8 layers 1/4-mil mylar, VDA 2 sides
;1-mil mylar, VDA 1 side
;
;All netting has cutouts over detectors.
;
;Total material in path = 7.25 mils mylar 
;VDA = Vapor-Deposited Aluminum, Angstroms thick
;
;
;Paul Turin
;Space Sciences Lab
;U.C. Berkeley
;pturin@ssl.berkeley.edu
;
; 7.25 mils mylar = .002192 *  gm/cm2/mil * 7.25 mils of carbon
; 	plus
;		    .001168 * gm/cm2/mil * 7.25  mils of oxygen
; 


;
;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(5), regions:intarr(5), 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.
0.850, .050, .0874, 0.012, 0.0006 ;frac1, frac2, frac3, frac4, frac5

; Top of Cryostat
; Kapton sheet, all regions, 1 sheet, 3-5 Mil thick, plastic (carbon). 
frac1, frac2, frac3, frac4, frac5, 1, 1, 1, 1, 1,       1, 1,  3.,  5.,  mils,  6,  0 

; Top Blankets, all regions,  5-12 layers of 0.25-0.5 mil mylar, 200 Angstrom Al per layer.
frac1, frac2, frac3, frac4, frac5, 1, 1, 1, 1, 1,       5, 12,  0.25, 0.5,  mils,  6,  0 

; Bottom of Cryostat
; Bottom Kapton sheet, all regions, 1 sheet, 3-5 Mil thick, plastic (carbon). 
frac1, frac2, frac3, frac4, frac5, 1, 1, 1, 1, 1,        1, 1,  3.,  5.,  mils,  6,  0 

; Bottom Blankets, all regions, 5-12 layers of 0.25-0.5 mil mylar, 200 Angstrom Al per layer.
frac1, frac2, frac3, frac4, frac5, 1, 1, 1, 1, 1,  5, 12,  0.25, 0.5,  mils,  6,  0 

;Shutters
;Shutter substrates, all regions, 4 layers of 5 mil carbon fibers.
;frac1, frac2, frac3, frac4, frac5, 1, 1, 1, 1,1,  4, 4,   5.,  5.,  mils,  6,  0 

;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, frac5, 1, 0, 0, 0, 0  1, 1,   15.,15.,  mils,  13,  1 
;2nd region
frac1, frac2, frac3, frac4, frac5, 0, 1, 0, 0, 0  1, 1,   15.,15.,  mils,  13,  1 

;3nd region
frac1, frac2, frac3, frac4, frac5, 0, 0, 1, 0, 0,    1, 1,   40.,40..,  mils,  13,  1 
;4th region- 0.5 mils Al   
frac1, frac2, frac3, frac4, frac5, 0, 0, 0, 1, 0,    1, 1,  1, 1, mils,  13,  1 
;5th region- 0.5 mils Al
frac1, frac2, frac3, frac4, frac5, 0, 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,frac5  1, 0, 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,  7.25 mil mylar, carbon
frac1, frac2, frac3, frac4, frac5, 1 1, 1, 1, 1,  1, 1,  .015892, .015892,  gmcm2,  6,   0 

;Cryostat mylar, all regions,  7.25 mil mylar, oxygen
frac1, frac2, frac3, frac4, frac5, 1 1, 1, 1, 1,  1, 1,  .008468, .008468,  gmcm2,  6,   0