Greetings,

    I have made some preliminary estimates of the mass of the copper
wires on the latest pigtail design. The estimates include only the
copper in the cables. I have not included the pins or contacts on the
connectors, insulation, nor the short CPC stub itself.

The spreadsheet can be found at:
http:/www-cdf.fnal.gov/upgrades/svxii/barrel_testing/pigtail_description.html

I am using the wire choices which give 1.117 W per cable

Here are the highlights:
-----------------------

	Total         	Total        Fraction	 
	Cross- 		Mass 	     of Total	 
	sectional	             Mass (%)	 
Type	Area (cm^2)     (g/cm)       of Pigtail	 
----    -----------    --------      --------	 

LV        0.075          0.67		68		
Bias      0.020   	 0.17		17
Fib	  0.016		 0.14		15
----------------------------------------------
Total     0.111          0.98          100
----------------------------------------------
  
Further, assume the following lengths for the cables:
(I only account for the length which shadows the SVXII)

Bulkhead 0: L = 6"
Bulkhead 1: L = 8"
Bulkhead 2: L = 18"
Bulkhead 0: L = 18"
Bulkhead 1: L = 8"
Bulkhead 2: L = 6"

Total Mass Calculation:
-----------------------

Total Mass = (0.98 g/cm)*(6+8+18+18+8+6)*(2.54 cm/inch)*(12 Pigtails/barrel)

		=====================
		Total Mass  = 1.91 kg
		=====================


To set the scale, according to the SVXII Material Budget sheet, 
---------------------------------------------------------------
(I'm not sure how up to date the material spreadsheet is, but I assume
it's within 20%?)


		Mass of  Ladders 	= 1.8 kg
			 Hybrid  	= 3.2 kg
			 HDI     	= 0.34 kg
			 Bulkheads	= 0.82 kg
			 Port Cards     = 1.79 kg
			 OuterScreen    = 0.15 kg
			 ------------------------
			 total            8.1 kg  
			

  Not included are: 
     spacetube, barrel mounts, cooling supply/return lines, temp probes, fiber optics.


So, I suspect that the pigtail cables will be about 25% of the entire SVXII.

In terms of scattering at a radius outside SVXII ladders, it will probably nearly 
double the mass out there.

As a side note, I explores the reduction in mass if we use Kapton cables
for the Bias and Fib. In this case, the total mass will be 0.73 g/cm. This
translates to a total mass of 1.42 kg for the Pigtail cables.

Again, for these calcualtions, I have only estimated the mass from the
copper wires, but I suspect this is the majority of it.