Lattice command

[mahendra2]

Can you explain what Lattice command do, say if i define a FODO with lattice command and i only define the fodo elements but not keep with in lattice command . Then what will be the difference?

[Didier]

Dear Sir, Hello

I don't understand what you're asking. Please be more specific. Some examples ?

Regards,

Didier

[mahendra2]

say i have one structure file like Lattice 2 1 ,drift, quad, drift, quad, drift, lattice_end and another i dont use Lattice command so structure file like drift, quad, drift, quad, drift and transport beam in both how the result is different or what is difference between this two structure file.
can you explain when to use lattice command

[Didier]

Dear Sir,

DIRFT QUAD DRIFT QUAD, normally it's LATTICE 4 1, because your period is made up of 4 elements.
Anyway, this lattice command doesn “t change anything to the simualion in these elements, it just allows the code to know your period in order to calculate the phase advances according to the period you're defined.

Regards,

Didier

[mahendra2]

is lattice 2 2 can be used instead of lattice 4 1

[Didier]

In your case, I don't think so.

[mahendra2]

i want to get the best value of quad strength which match the beam with given twiss parameter, how to do? my structure file is like:
DRIFT 200 100
MATCH_FAM_GRAD 1 1
QUAD 100 20 100
DRIFT 400 100
MATCH_FAM_GRAD 1 2
QUAD 100 -20 100
DRIFT 200 100
set_twiss 1 -1.246384 1.002772 1.246384 1.002772 0 0 (desired twiss at input and output)
END
is it correct ? i am not getting change in quad strength from 20

[Didier]

Dear Sir,

Follow the right syntax :

Code: Select all

DRIFT 200 100
MATCH_FAM_GRAD 1 1
QUAD 100 20 100
DRIFT 400 100
MATCH_FAM_GRAD 1 2
QUAD 100 -20 100
DRIFT 200 100
set_twiss 1 -1.246384 1.002772 1.246384 1.002772 0 0 0 0 0 0 1 1
DRIFT 0 100
END

Generally speaking, I can't check whether what you're doing is correct without your project configuration files. On the other hand, I suggest you don't use this method (MATCH8FAM_XXX...) but rather the ADJUST commands associated with diagnostic elements such as DIAG_XXX. It''s easier to andestand and use and powerful.

Regards,

Didier