[labnetwork] Pyrogenic internal torch

[Scott Blondell]

Greetings Labnetters,

We're in the process of tweaking our wet ox process. Hardware changes provided an opportunity to consider
alternatives to our current internal "candy cane" torch arrangement employed in several tubes. Currently running 6" silicon
in 205/211mm quartz w/candy cane torch. This doesn't give us the luxury of a simple visual inspection without pulling the tube.

A straight coaxial torch is being qualified now, and it's presenting some challenges. Growth rates are lower than predicted and
across boat uniform is >6%.

Polling the audience: what are your preferences - cane v straight?; straight torch design details/vendors?; gas flows?
There's a lot of knobs to turn - at 2/runs per day it's slow to fine tune.

We do have an MRL external torch that served us well for lower temp processes. Space and budget precludes using it in
multiple tubes.

Appreciate any feedback, tips or outright opinions.

Regards,

Scott P. Blondell
Fac. Mgr.
RIT SMFL
315.738.4073
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