The OPAL Discussion Forum

[John Parrack <jparrack AT g.ucla.edu>]

Also I can run a version that is just a closed mask with only the vertical stripe gaps if that’s helpful Dr. Adelmann. 

On Tue, Jul 25, 2023 at 13:59 John Parrack <jparrack AT g.ucla.edu> wrote:

Hi Adelmann, yes, I've run identical versions of the mask without vertical stripes (this mask and other variations) Whenever the stripes are not present, I have no issue. 

I could play around with the thickness of the vertical lines in this configuration, I've done other configurations with 20 bars instead of 26 and the thicker stripes between them caused no issue. 

I can definitely try to create this same mask with thicker gap lines if you think it will help diagnose the problem. Ultimately though, I ideally need to be able to simulate the mask with the thinner stripes as it models a physical mask element we're using.  

On Tue, Jul 25, 2023 at 12:55 Adelmann Andreas <andreas.adelmann AT psi.ch> wrote:

ok it looks like the simulation is setup nicely and from the output file I can not spot an obvious problem. 

I have two things you maybe can check easily: 

1. try to make the vertical line thicker 

2. Can you make two masks, one with the vertical stripes and one with the rest? 

Thanks & 

Cheers A
------
Dr. sc. math. Andreas (Andy) Adelmann
Paul Scherrer Institut OHSA/D17 CH-5232 Villigen PSI
Phone Office: xx41 56 310 42 33 Fax: xx41 56 310 31 91
Zoom ID: 470-582-4086 Password: AdA
Zoom Link: https://ethz.zoom.us/j/4705824086?pwd=dFcvT1pMMGY0bHg0dTNncUNZZTJkZz09

-------------------------------------------------------
Friday: ETH HPK G 28   +41 44 633 3076
============================================
The more exotic, the more abstract the knowledge, 
the more profound will be its consequences.
Leon Lederman 
============================================

On 25 Jul 2023, at 17:29, John Parrack <jparrack AT g.ucla.edu> wrote:

On Mon, Jul 24, 2023 at 12:14 PM Adelmann Andreas <andreas.adelmann AT psi.ch> wrote:

Can you send me the slurm output from the EEX simulation?

Cheers A
------
Dr. sc. math. Andreas (Andy) Adelmann
Paul Scherrer Institut OHSA/D17 CH-5232 Villigen PSI
Phone Office: xx41 56 310 42 33 Fax: xx41 56 310 31 91
Zoom ID: 470-582-4086 Password: AdA
Zoom Link: https://ethz.zoom.us/j/4705824086?pwd=dFcvT1pMMGY0bHg0dTNncUNZZTJkZz09

-------------------------------------------------------
Friday: ETH HPK G 28   +41 44 633 3076
============================================
The more exotic, the more abstract the knowledge, 
the more profound will be its consequences.
Leon Lederman 
============================================

On 24 Jul 2023, at 17:11, John Parrack <jparrack AT g.ucla.edu> wrote:

To reproduce, unzip MLCv2_Setup and convert input file to find requisite files in your directory. Run simulation on the EEX portion of the beamline using the MLCv2-Mask21f.pbm mask element. Extract the resulting h5 (or data around mask at step 16,17,18 or so) and view the distribution using the PlottingScript. 

If I follow this procedure using a mask without vertical stripes it seems to work normally, for the Mask21f (and 4o other variations on it) I observe the bleed through effect at the masking step and this leads to the witness beam being connected to the main distribution at the end of the beamline (an issue for us). 

Please let me know if you have any questions. Very possible I've made some mess along the way but I've been struggling to sort it out myself. 

 MLCv2_Setup.zip

On Mon, Jul 24, 2023 at 12:59 AM Adelmann Andreas <andreas.adelmann AT psi.ch> wrote:

Hi, this has nothing to do with AMR grids and yes in OPAL-t AMR is not supported.

Can you please send us a reproducer including the analysis script? Thanks Andy

------
Dr. sc. math. Andreas (Andy) Adelmann
Paul Scherrer Institut OHSA/D17 CH-5232 Villigen PSI
Phone Office: xx41 56 310 42 33 Fax: xx41 56 310 31 91
Zoom ID: 470-582-4086 Password: AdA
Zoom Link: https://ethz.zoom.us/j/4705824086?pwd=dFcvT1pMMGY0bHg0dTNncUNZZTJkZz09

-------------------------------------------------------
Friday: ETH HPK G 28   +41 44 633 3076
============================================
The more exotic, the more abstract the knowledge, 
the more profound will be its consequences.
Leon Lederman 
============================================

On 21 Jul 2023, at 17:23, Joel Andersson <joean407 AT gmail.com> wrote:

Hello,

Just out of curiosity, have you tried with different grid sizes to see if there is any correlations between bleeding and grid points?

Best regards

Joel

Den fre 21 juli 2023 17:12John Parrack <jparrack AT g.ucla.edu> skrev:

Hello, I'm having an issue with some of the simulations I'm trying to run and having difficulty resolving it. I was hoping to reach out for help. 

The issue appears to be that when I use certain masks elements, I see bleed through in a particular region. An example is attached below. The masking element contains thin vertical stripes and I've attempted to test many variations on it but this seems to correlate with this bleed through effect in the lower left quadrant just after the masking step. If I use an identical mask without the vertical striping it looks as expected but the vertical striping is an important feature of the simulation.

Would love some direction or guidance towards eliminating this issue. I'm out of ideas. 

--

John Parrack

Particle Beam Physics Lab | Undergraduate Physics | UCLA

<PlottingScript.txt><MLCv2-Mask21f.png><PlottingScript.ipynb><MLCv2-Mask21f.pbm>

<slurm-3085.out>

--

John Parrack

Particle Beam Physics Lab | Undergraduate Physics | UCLA