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Updating GC particle optimization example #44

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Merged
EstevaoMGomes merged 1 commit into from
Jul 17, 2026
Merged

Updating GC particle optimization example #44

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10 changes: 6 additions & 4 deletions examples/coil_optimization/optimize_coils_particle_confinement_guidingcenter.py
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Original file line number Diff line number Diff line change
Expand Up @@ -46,7 +46,10 @@
order=FOURIER_ORDER,
R=LARGE_R, r=SMALL_R,
n_segments=N_SEGMENTS,
nfp=NFP, stellsym=STELLSYM)
nfp=NFP, stellsym=STELLSYM,
scaling_type="L2",
scaling_factor=1.2,
scale_fixed=1.0)
init_coils = Coils(curves=init_curves, currents=jnp.array([COIL_CURRENT]*N_COILS))
init_field = BiotSavart(init_coils)

Expand All @@ -56,7 +59,7 @@
BAXIS_WEIGHT = 1.; BAXIS_TARGET = 5.7
RADIAL_DRIFT_WEIGHT = 1.

def loss_particle_radial_drift(field, particles, timestep=1.e-8, maxtime=1e-5, num_steps=300, trace_tolerance=1e-5, model='GuidingCenterAdaptative',boundary=None):
def loss_particle_radial_drift(field, particles, timestep=1.e-8, maxtime=1e-4, num_steps=300, trace_tolerance=1e-5, model='GuidingCenterAdaptative',boundary=None):
particles.to_full_orbit(field)
tracing = Tracing(field=field, model=model, particles=particles, maxtime=maxtime,
timestep=timestep,times_to_trace=num_steps, atol=trace_tolerance,rtol=trace_tolerance,boundary=boundary)
Expand All @@ -65,8 +68,7 @@ def loss_particle_radial_drift(field, particles, timestep=1.e-8, maxtime=1e-5, n
Z_axis=field.z_axis
#Ideally here one would differentiate in time through diffrax !TODO
r_cross=jnp.sqrt(jnp.square(jnp.sqrt(jnp.square(xyz[:,:,0])+jnp.square(xyz[:,:,1]))-R_axis+1.e-12)+jnp.square(xyz[:,:,2]-Z_axis+1.e-12))
v_r_cross=jnp.diff(r_cross,axis=1)#/tracing.times_to_trace*tracing.maxtime
return (jnp.sum(jnp.square(jnp.average(v_r_cross,axis=1))))
return jnp.average(r_cross[:,-1]) # Average radial end position of all particles at the end of the tracing, ideally this should be zero for perfect confinement

def normB_axis(field, npoints=15):
R_axis=field.r_axis
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