Constrains inside Quadrupole?

[PCaminal]

Hi all,

is there any way to constrain the Twiss parameters INSIDE a quadrupole?

Thanks a lot in advance!
Cheers,
Pau Gonzalez

[PCaminal]

I mean, I know that you could define a quadrupole which is the half of the width and put a mark in between. So, if I want a quadrupole with a total width of 0.25 m, I would do:

in the .ele file:
...
Q1: QUAD,L=0.125,K1=-0.5397597812035915
M1: MARK, FITPOINT=1
...

and in the .lte file:
...
BLINE: LINE=(...Q1,M1,Q1, ...
...

But is this the best solution to do that?
Thanks a lot in advance, again!
Cheers,
Pau

[michael_borland]

Pau,

Splitting the quadrupole is the only way to do this in elegant.

--Michael