The OPAL Discussion Forum

[Nicole Neveu <nneveu AT hawk.iit.edu>]

Hi All, 

I realized I didn't "reply all" when I commented on this. 

For reference on the opal list: 

--------------------------------------------------------

Hi Jon, 

I haven't looked at the h5 file recently, but I think the phase results are saved there?

Andreas can correct me if that's wrong. I say that based on OPAL 1.9 std output:

Ippl{0}> GUN_phi = 133.8499 [deg], corresp. in Astra = 243.8499 [deg],

Ippl{0}> E = 8.9337 [MeV], phi_nom = -20.0000 [deg]

Ippl{0}> Ez_0 = 64.0000 [MV/m]

Ippl{0}> time = 0.0000 [ns], dt = 1.0000 [ps]

Ippl{0}>

Ippl{0}> L1_phi = 316.7651 [deg], corresp. in Astra = 76.3815 [deg],

Ippl{0}> E = 19.1312 [MeV], phi_nom = 0.0000 [deg]

Ippl{0}> Ez_0 = 25.0000 [MV/m]

Ippl{0}> time = 2.2444 [ns], dt = 1.0000 [ps]

.

.

.

Ippl{0}> Saved phases in the h5 file: Cav-1-name -> GUN --- Cav-1-value -> 2.3361

Ippl{0}> Saved phases in the h5 file: Cav-2-name -> L1 --- Cav-2-value -> 6.0455

Nicole

On Mon, Feb 19, 2018 at 1:37 PM, Jonathan Edelen <jedelen AT radiasoft.net> wrote:

Hi Christof,

That will be good to keep in mind. Nicole's suggestion was exactly what I needed.

Thanks!

Jon

On Mon, Feb 19, 2018 at 12:29 PM, Christof Metzger-Kraus <christof.j.kraus AT gmail.com> wrote:

Hi Jon,

do you use version 1.9 of opal? Then you could, instead of APVETO, add an error to the lag using DLAG. If you set APVETO and change LAG then possibly the design trajectory changes. In contrary DLAG doesn't change the design trajectory. Unfortunately this feature doesn't seem to be documented yet

Christof

Am 19.02.2018 4:47 nachm. schrieb "Jonathan Edelen" <jedelen AT radiasoft.net>:

Hi Andreas,

I would like to run a simulation with autophasing on, then take the results of the autophase algorithm and re-run the simulation with autophasing off. Then perform perturbation studies on upstream cavities with downstream cavities at a constant absolute phase.

Jon

On Mon, Feb 19, 2018 at 3:30 AM, Adelmann Andreas (PSI) <andreas.adelmann AT psi.ch> wrote:

Hi Jon, use APVETO (https://gitlab.psi.ch/OPAL/src/wikis/Manual/elements) 

to flag the cavity (ies).

Cheers Andreas 

------
Dr. sc. math. Andreas (Andy) Adelmann
Staff Scientist

Paul Scherrer Institut WBBA/219 CH-5232 Villigen PSI
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On 19 Feb 2018, at 05:58, Adelmann Andreas (PSI) <andreas.adelmann AT psi.ch> wrote:

Begin forwarded message:

From: Jonathan Edelen <jedelen AT radiasoft.net>
Date: 19 February 2018 at 03:20:51 CET
To: Andreas Adelmann <andreas.adelmann AT psi.ch>
Subject: Running Opal without Autophase

Hi Andreas,

I am trying to make some comparisons between OPAL and measurements taken at Fermilab and I would like to run opal without autophasing to mimic the physics in the machine when we scan the phase of the gun relative to other cavities. Is there a way to export the results of the autophase routine and then use those results directly with autophasing off? This would hopefully give me the initial cavity phases from tune up and then I can vary the gun phase from there.

Best

Jon