Aladdin passive - LF20
Passive harmonic cavity case w/ LF20 Aladdin lattice:
Fig. 5 (a) & 5 (b) of [1]
Fig. 4 (a) of [2]
[1]: Bosch, R. A., Kleman, K. J., & Bisognano, J. J. (2001). Robinson instabilities with a higher-harmonic cavity. Physical Review Special Topics-Accelerators and Beams, 4(7), 074401.
[2]: Bosch, R. A. (2005). Instabilities driven by higher-order modes in a radio frequency system with a passive higher-harmonic cavity. Physical Review Special Topics-Accelerators and Beams, 8(8), 084401.
Imports
import numpy as np
import matplotlib.pyplot as plt
from mbtrack2 import CavityResonator
from aladdin import aladdin
from albums.scan import scan_psi_I0
from albums import SystemState
from albums import EquilibriumOptions, TheoryOptions
from albums import DEFAULT_FLOWS
Ring and cavity setup
ring = aladdin(mode="LF20", V_RF=50e3)
MC = CavityResonator(ring, m=1, Rs=0.5e6, Q=8000, QL=8000, detune=100e3)
MC.beta = 11
MC.Vc = 50e3
MC.theta = np.arccos(ring.U0/MC.Vc)
HC = CavityResonator(ring, m=4, Rs=1.24e6, Q=20250, QL=20250, detune=100e3)
Benchmark
points = 50
currents = np.linspace(0, 300e-3, points)
psi_HC_vals = np.linspace(80, 90, points)
method = "Bosch"
flow = DEFAULT_FLOWS[method]
flow_no_coupling = DEFAULT_FLOWS[f"{method}_no_coupling"]
N_sigma = 20
tau_boundary = ring.sigma_0*N_sigma
eq_opts = EquilibriumOptions(tau_boundary=tau_boundary,
passive_harmonic_cavity=True,
auto_set_MC_theta=True,
optimal_tunning=True)
Passive harmonic cavity - Robinson instabilities without coupling
Fig. 5 (a) in [1]
result = scan_psi_I0(
SystemState(ring, [MC, HC]),
psi_HC_vals,
currents,
flow=flow_no_coupling,
eq_opts=eq_opts,
theory_opts=TheoryOptions(mode_coupling=False))
result.plot("xi")
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Passive harmonic cavity - Robinson instabilities with coupling
Fig. 5 (b) in [1]
result = scan_psi_I0(
SystemState(ring, [MC, HC]),
psi_HC_vals,
currents,
flow=flow,
eq_opts=eq_opts,
theory_opts=TheoryOptions(mode_coupling=True))
result.plot("xi")
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Passive harmonic cavity - Robinson instabilities with coupling and HOM
Fig. 4 (a) in [2]
result = scan_psi_I0(
SystemState(ring, [MC, HC]),
psi_HC_vals,
currents,
flow=flow,
eq_opts=eq_opts,
theory_opts=TheoryOptions(mode_coupling=True, f_HOM=1e9, Z_HOM=10e3))
result.plot("xi")
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