SSL

8”  MCP  Transporter  Update  (response  to  MCPs  damaged  in  

shipping)  

Jason  McPhate  &  Jeff  Williams  LAPP  Tuesday  Telecon  

7  August  2012  

SSLJeff’s  piece  part  measurements  Transporter  Bases  

2  

8.014±.001

8.014±.001

.0300±.0015

SSLJeff’s  piece  part  measurements  MCPs  

3  

8.003

.0475±.0025

SSLThermal  ContracIon?  

•  Transporters  are  aluminum,  TCE  =  24  µin/in/°C.  •  MCP  glass  has  TCE  =  5.5  µin/in/°C.  •  lBase  =  8.014in,  lMCP  =  8.003in    Δl  =  .011in  •  Requires  a  temperature  change  of  -­‐74°C  for  the  MCP  to  get  Ight  in  the  transporter  base.    (i.e.,  T  ≈  -­‐50°C)  

•  Googling  “fedex  cargo  hold  temperature”  turns  up  a  paper  that  measured  this.    Max  temp  swings  were  closer  to  15°C.    (h_p://Inyurl.com/cyzt7lp)    

•  Nope.  

4  

SSLExisIng  Spring  Design  

5  

Area of spring applying “extra” force at corner?

MCP

Bit of a hand waving argument.

SSLRevised  Spring  Design  (updated  INCOM  design  agrees)    

6  

Eliminates “extra” force or any corner pinching of spring.