The OPAL Discussion Forum

[Christof Metzger-Kraus <christof.j.kraus AT gmail.com>]

Hi Anastasia,

the aperture in Opal-T is the same for all elements except for the dipoles. Since version 2.0 it is defined with a string defining the shape and the dimensions of the aperture. The examples you've found aren't supported anymore. 

What is it exactly that doesn't work with the aperture in the RF cavity element? 

Cheers, 

Christof 

<aaierides AT gmail.com> schrieb am Mi., 13. Mai 2020, 20:37:

Hi OPAL team,

I have been trying to assign the aperture attribute in RFCAVITY, and seems
like it isn't implemented for this OPAL element. Is that the case?

I have defined the RFCAVITY as follows:

CAV: RFCAVITY, L = L_CAV, Z = 0, X = 0, Y = 0, VOLT = VOLT_CAV, APERTURE =
"CIRCLE(${BEAM_DIAM}, 1)",  FMAPFN = "FIELDMAP.dat", FREQ = RF_FREQ;

I saw in some examples that the APERTURE is defined a bit differently as:

APERTURE = {0.001, 0.003}

Is this the correct way of defining the aperture for some elements and not
others?

It appears that the APERTURE attribute as defined in the RFCAVITY example
above works just fine for a DRIFT, but to not work for some other elements.

Any help on this would be greatly appreciated.

Thanks,

Anastasia