Elegant users forum

In updating the code to supply dalphax/dp and dalphay/dp to the twiss output file, I realized that the value being provided for optimization of dalphax/dp was incorrect (it is actually filled with dbetax/dp). This will be fixed in the next release. If you build from source, the attached file can be...

Guohui, From the manual and example of ELEGANT, I learned how to make correction of linear chromaticity. And for a collider, usually First-order corretion of chromaticity is needed at IP, like W function in MADX. The W function: W=SQRT(a^2+b^2), And b=1/beta * d(beta)/dp ; a= d(alf)/dp - alf * b; S...

And for the RANDOM_MULTIPOLES of KQUAD and KSEXT, if I don't write "random_number_seed = 0," in the &run_setup, the random value will keep the same when I do another process by &load_parameters and using the same lattice. In the situation of orb_corr.ele I uploaded, Is it right? Because I need many...

Guohui, About the multiple error of quadrupole and sextupole. I read them from sdds files into a lattice file. When I do many processes, I write a parameters file as shown in orb_corr.ele, like model.param0. Then my 3rd question: how can I find those multiple error of quadrupole and sextupole in th...

Hi, all. From the manual and example of ELEGANT, I learned how to make correction of linear chromaticity. And for a collider, usually First-order corretion of chromaticity is needed at IP, like W function in MADX. The W function: W=SQRT(a^2+b^2), And b=1/beta * d(beta)/dp ; a= d(alf)/dp - alf * b; S...

LEGO and elegant use different conventions for the order of multipoles. E.g., LEGO uses order=1 for dipoles, while elegant uses order=0, etc. The SDDS file has a column for each convention. You can learn more about the convention in elegant from the manual, particularly section 9.1 and the manual e...

The SDDS file for the quadrupole multipoles looks fine, except the entry for LEGOOrder=4 is incorrect (seems you copied the random rather than the systematic value). If is not a problem to have the extra order column (LEGOOrder); elegant will only look at the order, an (upright multiple), and bn (s...

michael_borland wrote:Not sure what the question is here...

--Michael

I finished the questions. I met some problem of upload pictures that moment

According to multiple error of PEP II, Multipole error of PEP II magnets.jpg and definition in ELEGANT, I made ELEGANT input as follow for Quadrupole and Sextupole QSPDS02: KQUAD, L=0.8, K1=-0.0696970675375, TILT=0, N_KICKS=20,& systematic_multipoles="quadSysMult.sdds",& random_multipoles="quadRanMu...

The DA search in elegant looks for the boundary between particle loss and particle survival. Particle loss can occur through various mechanisms Particle loss can occur when a particle hits a physical aperture, which can be defined by the user using MAXAMP, ECOL, RCOL, and SCRAPER elements, as well ...