The OPAL Discussion Forum

["Kuske, Bettina" <bettina.kuske AT helmholtz-berlin.de>]

Hi Wie Hou,

 

as Nicole pointed out; you have to use “WRITETOFILE = True,” command

to get the initial distribution.

Besides:

·         ASTRA uses the z and pz relative to the reference particle, and OPAL uses

absolute values.

·         Units in OPAL are ‘m’ for position and ‘bg’ for the momentum

·         ASTRA uses ‘m’ and ‘eV/c’

So there is a little more conversion to be done. (also the different order: x, px, y py, z, pz)

 

Bettina

 

 

 

 

From: opal-request AT lists.psi.ch <opal-request AT lists.psi.ch> On Behalf Of Wei Hou Tan
Sent: Mittwoch, 12. Februar 2020 20:17
To: Nicole R Neveu <nneveu AT stanford.edu>
Cc: opal <opal AT lists.psi.ch>
Subject: Re: [Opal] Loading initial distribution from Astra

 

Hi Nicole,

 

I am doing fine here, Philippe is quite happy with OPAL and hence we decide to use it to cross check results from ASTRA, IMPACT-T, etc.

There was no error when I ran both OPAL and ASTRA, just that they both gave different distributions.

I suspect that something is wrong when I converted ASTRA distribution (particle.ini) to OPAL format (opal.ini) but I could not figure out yet.

Here I attach log files from ASTRA and OPAL for your reference.

 

Thanks.

 

Regards

Wei Hou

---

From: Nicole R Neveu <nneveu AT stanford.edu>
Sent: Thursday, February 13, 2020 2:44 AM
To: Wei Hou Tan <tanweihou AT outlook.com>
Cc: opal <opal AT lists.psi.ch>
Subject: Re: [Opal] Loading initial distribution from Astra

 

Hi Wei Hou,

 

I’m doing good, and you?

 

Also, could you please send your error message?

I probably won’t get to this today, but I’ll try to take a look soon.

I’m doing similar comparisons.

 

Thanks,

 

Nicole

 

From: Wei Hou Tan <tanweihou AT outlook.com>
Date: Wednesday, February 12, 2020 at 10:38 AM
To: Nicole R Neveu <nneveu AT stanford.edu>
Subject: Re: [Opal] Loading initial distribution from Astra

 

Hi Nicole,

 

How are you ?

Here I attach all related input files for both ASTRA and OPAL.

Thanks.

 

Regards

Wei Hou

---

From: Nicole R Neveu <nneveu AT stanford.edu>
Sent: Thursday, February 13, 2020 2:01 AM
To: Wei Hou Tan <tanweihou AT outlook.com>; opal <opal AT lists.psi.ch>
Subject: Re: [Opal] Loading initial distribution from Astra

 

Hi Wei-Hou,

 

Can you please send error file / related input files.

 

Thanks,

 

Nicole

 

From: <opal-request AT lists.psi.ch> on behalf of Wei Hou Tan <tanweihou AT outlook.com>
Reply-To: Wei Hou Tan <tanweihou AT outlook.com>
Date: Wednesday, February 12, 2020 at 9:40 AM
To: opal <opal AT lists.psi.ch>
Subject: [Opal] Loading initial distribution from Astra

 

Guten Tag,

 

This is Wei-Hou TAN, graduate student from the Northern Illinois University working with Prof. Philippe Piot.

 

I would like to use my ASTRA initial distribution in OPAL to compare both ASTRA and OPAL simulation results.

However, I could not make it work.

The step0 distribution in OPAL hdf5 file is different from that of in ASTRA, it is shorter.

 

Here is what I did:

I generated my ASTRA distribution in the following format, then rearranged columns in red circles to produce correct format for OPAL.

Then in OPAL, I wrote the following:

Dist: DISTRIBUTION, TYPE = FROMFILE,

        FNAME = "opal.ini",

        EMISSIONMODEL = ASTRA,

        EMITTED = True;  

 

Is it correct ?

Thank you.

 

Regards

Wei Hou

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