Elegant users forum

Hi,

I have a linac comprised of a number of cavities. I would like to vary the phase at which these are run. Is there a way I can define a single phase variable in the lattice file and change one number rather than many 10s of cavities individually?

Thanks,
chris

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 = "10.1 sto phase1"

&run_setup ... &end

3. Use the alter_elements command from within the elegant command file
&run_setup ... &end

&alter_elements
name = L*, type=RFCA, item=PHASE, value=10.1
&end

--Michael