Re: Cathode Films from Sheldahl

[Simon Taylor <staylor@jlab.org>]

Hi, Fernando,

As far as thickness goes, 900 Angstroms of Gold should be okay:
For each gold layer I get  900 x 10^-10 m x 19.3 g/cm^3 / (6.4 g/cm^2) = 
2.7 x 10^-5 X0,
compared to 1.3 x 10^-4 X0 for 2 microns of Copper.  My concern for such 
a thin layer of conductor is handling:  I can well imagine it could be 
quite easy to cause breaks in the strips due to scratches...  Also, we 
would probably have to do some selective plating near where the strips 
need to be connected to the outside world.

Simon


Fernando J. Barbosa wrote:
>
> Sheldahl has a series of gold deposited materials that can be used for 
> the cathodes. These materials are normally specified as thermal 
> barriers in satellites but can be used for the FDC cathodes. Part # 
> 146437 (see below) is a standard product with 900 angstroms of Au on 
> 25 micrometer Polyimide and can be delivered in 48 inches wide rolls. 
> The left column below is for standard products (available) and they 
> range from 8 to 127 micrometer Polyimide.