SOLEIL II optimize RoQ/Q0

Code to optimize RoQ/Q0 for a given beam current.

Is similar to Fig.7 in [1] (lower resolution and using Venturini solver to be faster).

[1] Gamelin, A., Gubaidulin, V., Alves, M. B., & Olsson, T. (2024). Semi-analytical algorithms to study longitudinal beam instabilities in double rf systems. arXiv preprint arXiv:2412.06539.

Imports

import numpy as np
import matplotlib.pyplot as plt
from mbtrack2 import CavityResonator
from albums import scan_RoQ_Q0
from albums import SystemState
from albums import EquilibriumOptions, OptimiserOptions
from albums import DEFAULT_FLOWS

Ring and cavity setup

from mbtrack2 import Synchrotron, Electron
from mbtrack2 import Optics

def SOLEIL_II(V_RF=1.7e6):
    """
    SOLEIL II lattice v2366 w/ RF parameters from November 2023 RF budget.

    Parameters
    ----------
    V_RF : float, optional
        Total RF voltage in [V]. 
        The default is 1.7e6.
        
    Returns
    -------
    ring : Synchrotron object
        TDR lattice v2366_v3.

    """
    L = 353.97
    E0 = 2.75e9
    particle = Electron()
    ac = 1.05751e-04
    tune = np.array([54.2, 18.3])
    chro = np.array([1.6, 1.6])
    beta = np.array([3.288, 4.003])
    alpha = np.array([0, 0])
    dispersion = np.array([0, 0, 0, 0])
    h = 416
    particle = Electron()
    mcf_order = np.array([-0.00192226,  0.00061511,  0.00010695])
    U0 = 469e3
    tau = np.array([7.64e-3, 13.83e-3, 11.64e-3])
    sigma_delta = 9.063e-4
    emit = np.array([83.7e-12, 83.7e-12*0.01])
        
    optics = Optics(local_beta=beta, local_alpha=alpha, 
                  local_dispersion=dispersion)
    ring = Synchrotron(h, optics, particle, L=L, E0=E0, ac=ac, U0=U0, tau=tau,
                   emit=emit, tune=tune, sigma_delta=sigma_delta, chro=chro, 
                   mcf_order=mcf_order)
    
    tuneS = ring.synchrotron_tune(V_RF)
    ring.sigma_0 = (ring.sigma_delta * np.abs(ring.eta()) 
                    / (tuneS * 2 * np.pi * ring. f0))
    ring.get_longitudinal_twiss(V_RF)
        
    return ring
ring = SOLEIL_II(V_RF=1.7e6)

MC = CavityResonator(ring, m=1, Rs=5e6, Q=35.7e3, QL=6e3, detune=1e6, Ncav=4)
MC.Vc = 1.7e6
MC.theta = np.arccos(ring.U0/MC.Vc)

HC = CavityResonator(ring, m=4, Rs=2.358e6, Q=31e3, QL=31e3, detune=1e6, Ncav=1)

Optimize scan RoQ/Q0

bounds = [20, 90] # Min/Max values for psi_HC
psi0_HC = 85 # Initial guess for psi_HC
I0 = 0.5 # Beam current, A

Q0_vals = np.linspace(10e3, 50e3, 21)
RoQ_vals = np.linspace(30, 90, 21)

eq_opts = EquilibriumOptions(I0=I0,
                             tau_boundary=None,
                             set_MC_phase_HCpassive=True)  # set the MC phase to cancel the HC losses
opti_opts = OptimiserOptions(auto_psi_input=True,  # use xi_init_input instead of psi0_HC
                             xi_init_input=0.8,    # init guess for stable xi
                             loop_option=True)     # check the result of each optimization point

result = scan_RoQ_Q0(
            SystemState(ring, [MC, HC]),
            Q0_vals,
            RoQ_vals,
            flow=DEFAULT_FLOWS["Venturini"], # much faster for a notebook, set to DEFAULT_FLOWS["Alves"] to get the same as in the paper
            eq_opts=eq_opts,
            psi0_HC=psi0_HC,
            bounds=bounds,
            opti_opts=opti_opts)

result.plot("Touschek")                          # optimised Touschek-ratio map
result.after_opti.plot("Touschek")              # instability map just inside the optimum
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/home/gamelina/Python_dev/albums/albums/plot_func.py:380: UserWarning: No artists with labels found to put in legend.  Note that artists whose label start with an underscore are ignored when legend() is called with no argument.
  ax.legend(loc="lower right")
../_images/3c7897e454c48da98548bc759211ff021439238ba441b57030a938190670e67f.png ../_images/19fdd918ea1695068eeddf78ede341b09bf1b46cffcaea6c38f0a3c5acd171a2.png