Elegant users forum

Zhe, I think I've fixed these issues, using an approach similar to what you tried, but in a way that applies also to other elements. In the end, I had to disable the "exact" misalignment subroutines used by the tracking routines and use the versions that are linear in the errors. There's a bug in my...

Zhe,

Thanks, I'll check it out and let you know.

--Michael

Cai, If you want to compute the pole-tip field after the fact, you can use data in the parameter file (obtained via the parameters field in run_setup) as in sddsprocess run.param run.Btip -match=column,ElementParameter=K1 \ -define=parameter,H,"<energyInGeV> 1e9 * c_mks /",units=T*m \ -define=col,Bt...

Chao,

Your understanding of the cascaded filters is correct. There's a typo in your message
y[n] = \sum a_i y_{i-1} + \sum b_i y_{i-1}
should be
y[n] = -\sum a_i y_{i-1} + \sum b_i x_{i-1}

--Michael

Without a lattice file it isn't possible to say what the problem might be.

--Michael

Chao, Your understanding of the basic process is correct. The filter coefficients are dimensionless. For the voltage feedback, the voltage error is multiplied by 2(1+beta)/Ra to convert it to a current error. There is no separate gain control. The filter coefficients determine the gain. The manual p...

Pradeep, To understand the expression, you should first realize that before the expression is executed, the beam arrival time (Ct) is pushed onto the stack. In the example, T0=3.68e-6 is the revolution time, so "3.68e-6 /" results in the turn number (Ct/T0) being on the top of the stack. We then div...

Perhaps the attached example will help.

--Michael

Sara, I identified several issues The bunch interval (duplicate_stagger in makeBeam.ele) is wrong for your 500 MHz rf system. It should be a multiple of 1/MainRfFrequency. The Q of your harmonic cavity is very high. Even for SC cavities, we need to load the cavity to prevent very high beam-induced v...

These improvements are incorporated into the latest release, version 2022.2.

--Michael