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Merge pull request #120 from fsoubelet/ibs_gpu_fix
IBS CUDA GPUs
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examples/005_ibs/004_tracking_with_kicks_tbt_emittances.py
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| Original file line number | Diff line number | Diff line change |
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| # copyright ################################# # | ||
| # This file is part of the Xfields Package. # | ||
| # Copyright (c) CERN, 2021. # | ||
| # ########################################### # | ||
| import xfields as xf | ||
| import xobjects as xo | ||
| import xpart as xp | ||
| import xtrack as xt | ||
| from xfields.ibs._formulary import _gemitt_x, _gemitt_y, _sigma_delta, _bunch_length | ||
| import numpy as np | ||
| import matplotlib.pyplot as plt | ||
|
|
||
| # context = xo.ContextCupy() | ||
| context = xo.ContextCpu(omp_num_threads="auto") | ||
|
|
||
| ########################## | ||
| # Load xt.Line from file # | ||
| ########################## | ||
|
|
||
| fname_line_particles = "../../../xtrack/test_data/clic_dr/line.json" | ||
| line: xt.Line = xt.Line.from_json(fname_line_particles) | ||
| line.build_tracker(_context=context) | ||
| cavities = [element for element in line.elements if isinstance(element, xt.Cavity)] | ||
| for cavity in cavities: | ||
| cavity.lag = 180 | ||
| tw = line.twiss(method="4d") | ||
|
|
||
| ####################################### | ||
| # Create and Install IBS Kick Element # | ||
| ####################################### | ||
|
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||
| # ibs_kick = xf.IBSKineticKick(num_slices=50) | ||
| ibs_kick = xf.IBSAnalyticalKick(formalism="nagaitsev", num_slices=50) | ||
| line.configure_intrabeam_scattering( | ||
| element=ibs_kick, name="ibskick", index=-1, update_every=50 | ||
| ) | ||
|
|
||
| ################################ | ||
| # Generate Particles and Track # | ||
| ################################ | ||
|
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| nturns: int = 2000 | ||
| epsx, epsy, sigd, bl = [], [], [], [] | ||
|
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| particles = xp.generate_matched_gaussian_bunch( | ||
| num_particles=2500, | ||
| total_intensity_particles=int(4.5e9), | ||
| nemitt_x=5.66e-7, | ||
| nemitt_y=3.7e-9, | ||
| sigma_z=1.58e-3, | ||
| line=line, | ||
| _context=context, | ||
| ) | ||
|
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||
| for turn in range(nturns): | ||
| line.track(particles, num_turns=1) | ||
| epsx.append(_gemitt_x(particles, tw.betx[0], tw.dx[0])) | ||
| epsy.append(_gemitt_y(particles, tw.bety[0], tw.dy[0])) | ||
| sigd.append(_sigma_delta(particles)) | ||
| bl.append(_bunch_length(particles)) | ||
|
|
||
| ############################# | ||
| # Plot turn-by-turn results # | ||
| ############################# | ||
|
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||
| turns = np.arange(nturns) + 1 # start from 1 | ||
| epsx = np.array(epsx) | ||
| epsy = np.array(epsy) | ||
| sigd = np.array(sigd) | ||
| bl = np.array(bl) | ||
|
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||
| fig, axx = plt.subplots() | ||
| axx.plot(turns, 1e10 * epsx, c="C0", label=r"$\varepsilon_x$") | ||
| axx.set_xlabel("Turn") | ||
| axx.set_ylabel(r"$\varepsilon_x$ [$10^{-10}$m]") | ||
| axy = axx.twinx() | ||
| axy.plot(turns, 1e13 * epsy, c="C1", label=r"$\varepsilon_y$") | ||
| axy.yaxis.set_label_position("right") | ||
| axy.set_ylabel(r"$\varepsilon_y$ [$10^{-13}$m]") | ||
| fig.legend(loc="upper center", bbox_to_anchor=(0.5, 0.95), ncols=2) | ||
| fig.tight_layout() | ||
| fig.show() | ||
|
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||
| fig2, axd = plt.subplots() | ||
| axd.plot(turns, 1e3 * sigd, c="C2", label=r"$\sigma_{\delta}$") | ||
| axd.set_xlabel("Turn") | ||
| axd.set_ylabel(r"$\sigma_{\delta}$ [$10^{-3}$]") | ||
| axb = axd.twinx() | ||
| axb.plot(turns, 1e3 * bl, c="C3", label=r"$\sigma_z$") | ||
| axb.yaxis.set_label_position("right") | ||
| axb.set_ylabel(r"$\sigma_z$ [$10^{-3}$m]") | ||
| fig2.legend(loc="upper center", bbox_to_anchor=(0.5, 0.95), ncols=2) | ||
| fig2.tight_layout() | ||
| fig2.show() |
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