THE BELL SYSTEM TECHNICAL JOURNAL, MAY 1953 



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MAGNETIC FIELD PARAMETER, $ 



Fig. 5 — Noise change in a filament with uniform volume generation and equal 

 surface recombination rates. 



but the result is still rather complicated unless ^i = ^2 = ^. If we there- 

 fore restrict ourselves to that case we find 



Ai + A2 = 



B 



Xo 



D{1 + ^) a ' 



+ ^ 



and 



and 



1 + ^ 



2D I 



x|1 



Xq 



/:,u...^=g'(A^a+i))- 



