Snout assembly

DSSSDs

Upstream   3208-10/3208-18/3208-20
Downstream 3131-5/3131-10/3131-12

p+n junction side bias continuity checked OK for *all* wafers
 all c. 22 Ohm as expected

n+n Ohmic side bias continuity checked OK for both DSSSDs
 upstream 73 Ohm, downstream 92 Ohm

n+n Ohmic side bias wafer #2 
 positioned at top of snout assembly ( lower stage snout side marked 'T' )

p+n junction side faces downstream


Distances

Using top edge of lower stage snout as reference

ref - middle of upstream bPlas 8.0cm
ref - upstream DSSSD 11.0cm
ref - downstream DSSSD 12.0cm
ref - middle of downstream bPlas 14.0cm

Measurements consistent to +/-1mm between LHS and RHS of snout assembly as viewed from top side 


13.00 At this position the Kapton PCBs bulged in/out and there was some concern that when the upper stage
snout was installed it would the Kapton PCBs into the 'active' area. It was decided to move the 2x bPlas
and 2x DSSSDs c. 5mm downstream.

Jeroen and Phillip cut sections from 4x PEEK 6mm spacers so that they would clip onto 3mm dia support rods.

We raised the assembly fro the inter stage and inserted the modified spacers between the inter stage and 
the other spacers above. The Kapton PCBs now run fairly straight to the DSSSD connectors.

Distances re-measured as

Using top edge of lower stage snout as reference

ref - middle of upstream bPlas 8.6cm
ref - upstream DSSSD 11.5cm
ref - downstream DSSSD 12.4cm
ref - middle of downstream bPlas 14.5cm