An early analysis of a fused silica loaded cavity by Sigma Tau:
http://www.dtic.mil/cgi-bin/GetTRDoc?AD=ADA497003&Location=U2&doc=GetTRDoc.pdf
<http://www.dtic.mil/cgi-bin/GetTRDoc?AD=ADA497003&Location=U2&doc=GetTRDoc.pdf>
Although the dielectric constant tempco and thermal expansion tempco of
fused silica is low so is the dielectric constant so the reduction in
cavity volume is relatively small.
The reduced Q of a dielectric loaded cavity may also be an issue in the
absence of cryogenic cavity cooling.
Bruce
Poul-Henning Kamp wrote:
In message<4c7eb534.2040...@xtra.co.nz>, Bruce Griffiths writes:
The tempco of the dielectric constant of sapphire is quite large so the
cavity resonance tempco is somewhat larger than that of an unloaded
copper or aluminium cavity.
Yes, they write that cavity autotuning is a must.
I still think that is a smaller problem than getting hold of and
maching an unloaded cavity with the necessary shields.
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