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Forum: Processes Involving Optical Photons
Re: Warning Problem with Cerenkov Process and EM Option 4 (or 3...) (Nicole Ackerman)
Date: Mar 04, 09:08
From: Daren Sawkey <Daren Sawkey>

Hi,

Re: the infinite loop, in version 10.4.patch3 we tried to add protection against this.

https://bugzilla-geant4.kek.jp/show_bug.cgi?id=1992

At the time it appeared the infinite loop would only happen for steps < 1e-16 mm. You see it happen for slightly larger steps.

We'll fix it for the next patch release. Meanwhile you can either try to change the value here:

http://www-geant4.kek.jp/lxr/source/processes/electromagnetic/xrays/src/G4Cerenkov.cc#L556

or, note that the cause is likely to be something numeric. Try changing RINDEX by a small amount. With

/opnovice2/boxProperty RINDEX .000002 1.33 .000008 1.330000001

the infinite loop seems to go away.

Re: changes in results. I don't see anything in the history files that would suggest the results have intentionally changed. If you get results that are wrong etc. please post either here or in bugzilla.

-- Daren.

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