...

 The current material definition is:

<composite name="blanket" density = "0.081">
<addmaterial material="Aluminum">
<fractionmass fraction="27" />
</addmaterial>
<addmaterial material ="Silicon">
<fractionmass fraction="144" />
</addmaterial>
<addmaterial material ="Oxygen">
<fractionmass fraction="70" />
</addmaterial>
<addmaterial material ="Carbon">
<fractionmass fraction="530" />
</addmaterial>
<addmaterial material ="Hydrogen">
<fractionmass fraction="26" />
</addmaterial>
</composite>

...

Please refer to Figure 3 of this document.

Final Design 

Here is a link to the final design document. 

Currently in the simulation we model the blanket as simple boxes on the top and four sides without the crown.  It may be time to modify that.  But for the time being we will provide number both for this simplified blanket model and something closer to reality that includes the crown.

Simplified version (without crown):
Distance from bottom of MMS and top of top ACD tiles: 3.23 cm
Distance from bottom of MMS and top of side ACD tiles:  0.23 cm
Distance between MMS and start of side ACD tiles:  1.80 cm

With Crown:
Distance from bottom of MMS and top of top ACD tiles: 0.69 cm
Distance from bottom of MMS and top of side ACD tiles:  0.23 cm
Distance between MMS and start of side ACD tiles:  1.80 cm

Note that the big difference is the distance between the top of the ACD tiles and the bottom of blanket, due to the need in the simplified model to have one box represent the blanket along the top, which must also clear the crown of the tiles themselves.

Final Design 

Here is a link to the final design document. 

Note the crown on the top,  currently we Note the crown on the top,  Bill asked that we attempt to retain our current volumes and adjust the density accordingly.  We will neglect the crown at this time and continue to model the blanket as simple boxes on the top and four sides. 

The blanket is constructed of mulitple layers of material:
Kevlar C21H15N3O3
56 cm radiation length
6 layers on the top, 8 layers on the sides
Nextel Al2O3 (62.5%) SiO2 (24.5%) B2O3 (13%)   
42 cm radiation length
4 layers
Solomide Foam density = 0.005 g/cm3 
No chemical formula is provided
Material properties 0.0036 g/cm2
0.65 cm thickness/layer (density 0.0055 g/cm3)
according to the final design document, Composition similar to that of Kapton. Equivalent thickness of Kapton determined by scaling by the density = 0.010 cm
Radiation length of Kapton 28.2 cm
MLI&Handling Layers density = 1.4 g/cm3
Thickness 0.07 cm total of all materials
Area density 0.098 g/cm2
Radiation length 28.2 cm
From the description sounds like mostly Kapton (C22H10N2O5)  The only other material explicitly mentioned is Germanium, but after consulting with Dave Thompson (GSFC) it was decided that could be ignored..it only contributes 1000 Angstroms, or 0.00001 cm.

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