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Describe the bug

mrsimulator is returning spectra with periodic dimensions, even though spectra shouldn't be periodic

To Reproduce

Steps to reproduce the behavior:

from mrsimulator import Simulator, SpinSystem, Site
from mrsimulator.method.lib import BlochDecaySpectrum
import matplotlib.pyplot as plt

H_site = Site(isotope="1H", shielding_symmetric={"zeta": 13.89, "eta": 0.25})
spin_system = SpinSystem(sites=[H_site])

static = BlochDecaySpectrum(channels=["1H"])
mas = BlochDecaySpectrum(channels=["1H"], rotor_frequency=1000)  # in Hz

sim = Simulator(spin_systems=[spin_system], methods=[static, mas])
sim.run()

print(sim.methods[0].simulation.x[0].period)

returns 25000 Hz

Expected behavior

Would expect a period of infinity (this is what I get if I print the period of a csdf object with periodic unchecked in RMN)

Desktop (please complete the following information):

• OS: Windows 11
• Python version: 3.9.19
• mrsimulator version: 0.8.0rc