The OPAL Discussion Forum

[Anastasiya Bershanska <nastya AT mit.edu>]

Hello Matthias,

I’ve added FMLOWE and FMHIGHE. However, MATCHEDGAUSS still doesn’t converge even though I have a distribution that can be accelerated in the same cyclotron with the same initial conditions. Is it possible there’s another bug in the code (like negative initial momentum) or that matched distribution is initialized with non-zero initial phase?

Thank you,

Anastasiya

On Aug 1, 2018, at 4:29 AM, Frey Matthias (PSI) <matthias.frey AT psi.ch> wrote:

Hi Anastasiya

You don't specify "FMLOWE" and "FMHIGHE" in the Cyclotron definition. Those are the minimum and maximum energy of the cyclotron in MeV. This can cause the problem. Yes, it's a bug in the sense that it doesn't throw an error when these aren't specified. I will change that.

But try with specifying those.

Best,

Matthias

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Von: opal-request AT lists.psi.ch [opal-request AT lists.psi.ch]" im Auftrag von "Anastasiya Bershanska [nastya AT mit.edu]
Gesendet: Mittwoch, 1. August 2018 00:32
An: opal AT lists.psi.ch
Betreff: [Opal] [OPAL] MatchedGauss doesn't work

Hello,

I’m trying to generate a matched distribution for a cyclotron and get error “didn't find any matched distribution” in Distribution::CreateMatchedGaussDistribution. A distribution that works should exist (because it’s been calculated before for different harmonic). Is there possibly a bug in the code?

Thank you,

Anastasiya 

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