Improvement the Bending Magnet Power Supply Performance for TPS Storage RING

Abstract

In the TPS (Taiwan Photon Source) facility, current stability of the electron beam depends on the bending magnet power supply and an orbit FOFB system to compensate the magnetic field. Due to the output current stability of the bending magnet power supply drifts with temperature so the orbit FOFB system should be applied to fine tune magnetic field and the photon beam should circulate in storage ring. In this paper, to stabilize the temperature of regulation circuit’s temperature box of the bending magnet power supply, the long-term output current stability is improve from ± 50ppm to ± 10ppm, and orbit FOFB system substantially reduce the tune X of beam position, effectively increasing the beam current stability and quality. In the TPS (Taiwan Photon Source) facility, current stability of the electron beam depends on the bending magnet power supply and an orbit FOFB system to compensate the magnetic field. Due to the output current stability of the bending magnet power supply drifts with temperature so the orbit FOFB system should be applied to fine tune magnetic field and the photon beam should circulate in storage ring. In this paper, to stabilize the temperature of regulation circuit’s temperature box of the bending magnet power supply, the long-term output current stability is improve from ± 50ppm to ± 10ppm, and orbit FOFB system substantially reduce the tune X of beam position, effectively increasing the beam current stability and quality.

Cosmological Constraints on Neutrino Masses in Light of JWST Red and Massive Candidate Galaxies

“…in Equation (5) gives a likelihood of cosmological parameters and SFE. For more detailed information of the data set, such as the redshifts and stellar masses of the candidate galaxies, we refer the readers to Wang et al (2023a).…”

“…Labbé et al (2023) found six candidate massive galaxies (stellar mass 10 10 solar masses) at 7.4 z 9.1. This finding suggests that either the star formation efficiency (SFE) significantly exceeds its typical values in low-redshift galaxies, or the halo mass function is about 2σ higher than the prediction of the standard ΛCDM cosmology (Haslbauer et al 2022;Wang et al 2023a;Boylan-Kolchin 2023;Lovell et al 2023;Qin et al 2023). Although at the current stage a large SFE cannot be theoretically excluded (Zhang et al 2022;Qin et al 2023), a large SFE at z  7 tends to enhance the UV radiation from galaxies, causing a faster reionization process that is in tension with observation (Goto et al 2021;Wold et al 2022;Lin et al 2024).…”

“…The aim of this section is to extend the likelihood of massive galaxy counting in Wang et al (2023a), which we sketch below, to massive neutrino models.…”

“…We adopt the triangular distribution function, which is shown to be a more conservative estimation than smooth distributions, e.g., the skew-normal distribution. See Wang et al (2023a) for more detailed description of the algorithm and its theoretical explanation.…”

“…calculator in Wang et al (2023a). As shown in the left panel of Figure 2, the expected number of massive galaxies 〈N th 〉 decreases with the sum of neutrino masses, while the other cosmological parameters (Ω m = 0.3158, Ω b = 0.04939, h = 0.6732, A s = 2.101 × 10 −9 , n s = 0.9661) are fixed at the Planck best-fit values (Aghanim et al 2020).…”