The OPAL Discussion Forum

["Dr. Simon Friederich" <s.friederich AT uni-mainz.de>]

Hello again,

I am sorry. I forgot to correct the LAG:

steerer: RFCAVITY,  APERTURE = "circle(0.04)", L=0.09, Z=0.1,
    FREQ=1e-10,  // 3DDynamic as static field
    VOLT = 1, // Normalization must not be used (see annotation below)
    APVETO = TRUE,  // Correction: Not autophased
    LAG=PI/2, // Correction: default = 0, δE=VOLT⋅sin⁡(2π(LAG−HARMON⋅f0t)), see manual 11.15\delta E=\mathrm{VOLT}\cdot\sin(2\pi(\mathrm{LAG}-\mathrm{HARMON}\cdot f_0 t))
    FMAPFN="H-fieldmap_steerer_3DDynamic.t7";

Best regards
Simon

Am 01.03.2021 um 10:02 schrieb Dr. Simon Friederich:

Dear all,

Am 01.02.2021 um 09:54 schrieb Christof Metzger-Kraus:

Alternatively: If I chose 3DDynamic with only zero E-field columns but non-vanishing B-field, does this work as expected?

In case others might find this useful:

I tested it. 3DMagnetostatic does not work for RFCavity elements (yet), but 3DDynamic with Zero-E-field columns does.
Here an example of a steerer (dipole) field I've implemented:
steerer: RFCAVITY,  APERTURE = "circle(0.04)", L=0.09, Z=0.1,
    FREQ=1e-10,  // 3DDynamic as static field
    VOLT = 1e12, // Normalization must not be used (see annotation below), hence a high amplitude is needed
    FMAPFN="H-fieldmap_steerer_3DDynamic.t7";

Head of fieldmap file:

Important is here:
The first line in the fieldmap must contain "3DDynamic FALSE", otherwise OPAL won't run
(I guess, because of "Ex, Ey, Ez = 0", the algorithm can not normalize it).

Best regards
Simon

-- 
Dr. Simon Friederich
Helmholtz-Institut Mainz | Insitut für Kernphysik
Kollaboration ACID       | B
Johannes Gutenberg-Universität Mainz
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55128 Mainz, Deutschland

Tel.: +49 (0)6131 39-23160
E-Mail: s.friederich AT uni-mainz.de