Larmor power limit for cyclotron radiation of relativistic particles in a waveguide

• Published in: New journal of physics Vol. 26; no. 8; pp. 83021 - 83034
• Main Authors: Buzinsky, N, Taylor, R J, Byron, W, DeGraw, W, Dodson, B, Fertl, M, García, A, Goodson, A P, Graner, B, Harrington, H, Hayen, L, Malavasi, L, McClain, D, Melconian, D, Müller, P, Novitski, E, Oblath, N S, Robertson, R G H, Rybka, G, Savard, G, Smith, E, Stancil, D D, Storm, D W, Swanson, H E, Tedeschi, J R, VanDevender, B A, Wietfeldt, F E, Young, A R
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 01-08-2024
• Subjects: Beta decay; Charged particles; Cyclotron radiation; Cyclotrons; Larmor power; Lorentz factor; Particle decay; Particle physics; Positrons; Radiation; Rectangular waveguides; Relativistic effects; Relativistic particles; Spectrum analysis; Standard model (particle physics); waveguide
• ISSN: 1367-2630; 1367-2630
• DOI: 10.1088/1367-2630/ad6d85

Abstract Cyclotron radiation emission spectroscopy (CRES) is a modern technique for high-precision energy spectroscopy, in which the energy of a charged particle in a magnetic field is measured via the frequency of the emitted cyclotron radiation. The He6-CRES collaboration aims to use CRES to probe beyond the standard model physics at the TeV scale by performing high-resolution and low-background beta-decay spectroscopy of 6 He and 19 Ne . Having demonstrated the first observation of individual, high-energy (0.1–2.5 MeV) positrons and electrons via their cyclotron radiation, the experiment provides a novel window into the radiation of relativistic charged particles in a waveguide via the time-derivative (slope) of the cyclotron radiation frequency, d f c / d t . We show that analytic predictions for the total cyclotron radiation power emitted by a charged particle in circular and rectangular waveguides are approximately consistent with the Larmor formula, each scaling with the Lorentz factor of the underlying e ± as γ 4 . This hypothesis is corroborated with experimental CRES slope data.