Elegant users forum

Sorry I didn't see this one sooner. The best way to compute the beam sizes with coupling is using the moments_output command. I've attached an example. For example, to see the vertical beamsize due to quadrupole tilt errors % elegant parMoments.ele % sddsplot -column=s,s3 parMoments.mom -split=page ...

Sorry I didn't see this item sooner. CSBEND is different from KQUAD and KSEXT in that it includes explicit parameters for the higher multipoles. You can use K1, K2, K3, ..., K8 or B1, B2, B3, ..., B8. Please see this link for more details: http://www.aps.anl.gov/Accelerator_Systems_Division/Operatio...

Chris, There are two main options: 1. In run_setup, use the centroid parameter to specify the name of a file to which centroid information will be written. The relevant quantity is Cdelta, defined as <p>/pCentral-1. 2. Add several WATCH elements with mode="coordinate" to see the change in the partic...

Chris,

I'll add this to the list.

I can't think of a way to do it in the present version.

--Michael

Chris, There are several ways to do this. 1. Inside the lattice file, define a variable and then use it in the element definitions % 10.7 sto phase1 l1: rfca,phase="phase1",... l2: rfca,phase="phase1" etc. 2. Same as 1, but set the phase1 value in the elegant command file: &rpn_expression expression...

There is a bug in the LSRMDLTR element when the field expansion is set to "leading-terms" or "exact". The longitudinal magnetic field has the wrong sign, leading to incorrect vertical focusing. For those who build from source, a corrected file is attached. This fix will appear in the next release. T...

Chris,

You can do this by using the matrix_output command to get the matrix into an SDDS file, e.g.,

&matrix_output
SDDS_output = <filename>,
SDDS_output_order = 1
&end

This will output the first-order matrix elements vs s for the beamline named in run_setup.

--Michael

Frank,

I don't think you missed anything. It doesn't appear to be in the manual.

I'll add it. Thanks for the suggestion.

--Michael

Frank, The problem is that the name of the element starts with a digit. While this is legal in elegant, it causes problems when elegant attempts to create a parameter in the .fin file corresponding to the varied quantity. The reason is that SDDS forbids names that start with digits, because it cause...

Hisham, Unfortunately there's no element that combines all of those fields conveniently. There are two options: * Add two zero-length MULT elements on either side of the KQUSE element. Set ORDER=3 to get octupole field. * Use KQUAD, and specify the sextupole and octupole fields using the SYSTEMATIC_...