Error in calculating dynamic aperture in presence of

[ranamonikaa]

Hi,
I am attempting to calculate the dynamic aperture with an initial momentum offset applied to the beam. However, regardless of how small the momentum spread is, I consistently encounter the following error:
Unable to update page--new number of rows less than previous number (SDDS_UpdateBinaryPage)
Problem setting SDDS parameter values (do_aperture_search)
This issue arises when I include the following line in the input:
&vary_element name=MALIN, item=DP, initial=-0.0025, final=0.0025, index_number=0, index_limit=11 &end
If I remove this line, the dynamic aperture calculations run successfully without any errors.

I'm unable to determine what is causing this behavior. I’ve attached the relevant .ele and .lte files for reference. Any help in resolving this would be greatly appreciated.

Thank You!

[michael_borland]

I downloaded your files and they work without errors. Perhaps try the latest version of the code?

--Michael

[ranamonikaa]

I have tried this with the latest version and still getting the same errors. is there anything else that I should do?

-Monika

[michael_borland]

Monika,

I was able to reproduce this error. I'm not sure why I didn't see it before.

The problem is that you have a WATCH element in the beamline while doing a DA search. This causes some confusion in the code about the length of the table necessary to store the data. I'll see what I can do to fix the problem.

Meanwhile, a workaround is just to remove that WATCH element.

--Michael