Re: neutron detector rings

[René Prieels <R.Prieels@fynu.ucl.ac.be>]

Dear Peter,

This will depend on the torque you will exert on the DEMON external 
tube. The external diameter is not precise enough to fit  closely into 
the holder ring you are speaking on.  There can be a small tilt. I 
nevertheless suspect that the external cylinder of the DEMON detector 
is rigid enough to sustain the torque even if inserted in a 10 cm 
length tube.
On the other hand, the two independent rings  insures constraints on 
the whole, reduce the tilt  and define also the longitudinal  position 
of the detector.
So there is a compromise between holding and the position versatility.  
Concerning the possibilities to vary the longitudinal position of the 
detector: 10 cm gives the biggest variations,  20 seems constraining, 
15 was ideal for us.
So 10 cm seems not really forbidden.

Best regards,
Rene




Le 05-juin-05, à 05:10, Peter Kammel a écrit :

> Dear Rene,
>
> I am just getting ready to leave to PSI tomorrow. I talked
> with our techs on Friday. Their neutron detector support
> bars are well under way. One question here:
> They are just milling support rings (to be welded on to the
> bars) of 20 cm height. The Demon structure used 15 cm
> high rings. Could we cut our rings in half to have only
> 10 cm height? The other dimensions are very close to
> the rings used at Demon.
>
> If would save us some milling work. But if there is
> any doubt we will stay with our 20 cm height.
>
> Thanks
>
> Peter
>
>
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  René PRIEELS                                   Universite Catholique 
de Louvain
  email: R.Prieels@fynu.ucl.ac.be     Departement de Physique / FYNU
  Tel  : ++ 32 (0)10 / 47 32 09             Chemin du cyclotron, 2
  Fax  : ++ 32 (0)10 / 45 21 83            B-1348 Louvain-la-Neuve - 
BELGIUM
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