Elegant users forum

michael_borland wrote:The problem is more likely to be in the .lte file. You can email it to me (borland at aps.anl.gov) if you don't want to post it.

Things to check are a sufficient number of kicks (N_KICKS parameter) on KQUAD and CSBEND elements.

--michael

Thank you. I already email to you.

HI Michael

ele file was attached already as the first attached file. 'da_fma.ele'
I modified my question topics

And I checked the .twi file also.
the nux and nuy are .22 and .16.

Hi michael, A result of the tune footprint of FMA is shown in fma2216.png. The tune of the lattice is (.22, .16), But the top in the tune footprint plot is not. the top in the tune footprint is like (.204, .163). fma2216.png Another result plot is made by LEGO．　 LEGO result.png I changed several num...

Hi wguo, Could you attach an example with multipole errors of the dipoles. Thank you. Guohui There is a way to add multipole errors for the dipoles--by using the MULT element. It can be used as a zero length kick element. Even though dipole magnets might be long , the multipoles are really generated...

Guohui, So centroid[0] means x, centroid[1] means x', centroid[2] means y, centroid[3] means y', centroid[4] means t, centroid[5] means p. if we want a centroid offset of x = 0.001 m and y = 0.001 m , we should write : centroid[0, 2] ={1e-3, 1e-3}. Is it right? That's not quite right. centroid[4] i...

Guohui, And what's the meaning of ' centroid[2] = 1e-3 ' ? a y offset=0.001 m ? In your definition of centroid, it is double centroid[6] = {0.0, 0.0, 0.0, 0.0, 0.0, 0.0}; And I guess {0.0, 0.0, 0.0, 0.0, 0.0, 0.0} is values in (x, x’, y, y’, t, p) Is it right? Yes, that's all correct, except centro...

Guohui, If I understand correctly, you want to set the initial y coordinate to a fixed value and scan the x coordinate to find the aperture. You can do this by simply creating a line of particles in phase space, e.g., &bunched_beam n_particles_per_bunch = 100, bunch = %s.bun, ! 20mm horizontal size...

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Hello, Michael, and other experts, Usually we make dynamic aperture line survey as shown in follow figure. DAline-survey.jpg And we can use like follow words to get the dynamic aperture for the line (X= n*sigma_x, Y=n*sigma_y), (X= -n*sigma_x, Y=n*sigma_y) and (X= 0*sigma_x, Y=n*sigma_y). &find_aper...