storage ring
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2022 ◽  
Vol 29 (1) ◽  
Author(s):  
J. Kim ◽  
G. S. Jang ◽  
B. H. Oh ◽  
J. Lee ◽  
S. Shin

A novel scheme to measure the longitudinal emittance and phase space profile in an electron storage ring by using correlations between time and the vertical coordinate, and between energy and the horizontal coordinate, is proposed. This longitudinal profile measurement scheme will help to demonstrate recent results of advanced studies for manipulating the longitudinal beam profile and for investigating beam instability in an electron storage ring.


2022 ◽  
Vol 29 (1) ◽  
pp. 118-124
Author(s):  
Kentaro Harada ◽  
Nobumasa Funamori ◽  
Naoto Yamamoto ◽  
Yoshito Shimosaki ◽  
Miho Shimada ◽  
...  

The Hybrid Ring with a superconducting-linac injector as a highly flexible synchrotron radiation source to enable new experimental techniques and enhance many existing ones is proposed. It is designed to be operated with the coexistence of the storage (SR) bunches characterized by the performance of the storage ring, and the single-pass (SP) bunches characterized by the performance of the superconducting linac. Unique experiments can be performed by simultaneous use of the SR and SP beams, in addition to research with various experimental techniques utilizing the versatile SR beam and research in the field of ultrafast dynamics utilizing the ultrashort pulse of the SP beam. The extendability of the Hybrid Ring will allow it to be developed into a synchrotron radiation complex.


2022 ◽  
Vol 17 (01) ◽  
pp. P01001
Author(s):  
J. Xu ◽  
Z. Ren ◽  
P. Yang ◽  
G. Liu ◽  
Z. Bai

Abstract The Hefei Advanced Light Facility (HALF) is a soft X-ray diffraction-limited storage ring being designed with an energy of about 2.2 GeV and an emittance goal of less than 100 pm·rad. The present HALF lattice is a modified hybrid six-bend-achromat (6BA) lattice with a long and a short straight section in each cell. In this paper, a 7BA lattice is designed for HALF as a promising option, which follows the main feature of hybrid 7BA lattice, but to have a compact configuration and lower emittance, all bends in this lattice are combined-function bends and reverse bends. The designed HALF storage ring has a circumference of 388.8 m and 20 identical cells. Two solutions with different betatron tunes are studied for this lattice. One with smaller tunes has better nonlinear dynamics performance allowing for off-axis injection, which has a natural emittance of 67 pm·rad. The other with larger tunes has very small beta functions at the straight section as well as lower natural emittance of 59 pm·rad, which can enhance the brightness of insertion device (ID) radiation. The intra-beam scattering effect and ID radiation properties are also presented in this paper.


2021 ◽  
Author(s):  
Jian DING

Electromagnetic radiation can cause an electron to be further broken down, because the radiated photons have taken away a part of the static mass that originally belonged to the electron. This article makes use of the experimental data approved by HLS800MeV electron storage ring, and reasonably calculates that the static mass of each electron in the ring is roughly in the range of 1.16×10-33 to 3.23×10-35 (kg). Once a consensus can be reached on this, it will mean the end of the century-long wandering of modern physics. If tracing its root, the problem has lain in relying solely on experimental data, like a blind person crossing the river by feeling for stones, difficult to grasp the correct research direction. So it is pointed out that based on the continuities of the development among truths and objective things are more reliable than relying solely on experimental data. Because the experimental data are not eternal, but any truth must be eternal. So once the two are combined with each other, as if the blind person has regained his vision again. That is, only based on the concepts and methods introduced in this article "The theory on thing's limits", the correct research direction can be ensured.


2021 ◽  
Vol 16 (12) ◽  
pp. P12009
Author(s):  
A. Romanov ◽  
J. Santucci ◽  
G. Stancari ◽  
A. Valishev ◽  
N. Kuklev

Abstract We present the results of experimental studies on the transverse and longitudinal dynamics of a single electron in the IOTA storage ring. IOTA is a flexible machine dedicated to beam physics experiments with electrons and protons. A method was developed to reliably inject and circulate a controlled number of electrons in the ring. A key beam diagnostic system is the set of sensitive high-resolution digital cameras for the detection of synchrotron light emitted by the electrons. With 60–130 electrons in the machine, we measured beam lifetime and derived an absolute calibration of the optical system. At exposure times of 0.5 s, the cameras were sensitive to individual electrons. Camera images were used to reconstruct the time evolution of oscillation amplitudes of a single electron in all 3 degrees of freedom. The evolution of amplitudes directly showed the interplay between synchrotron-radiation damping, quantum excitations, and scattering with the residual gas. From the distribution of measured single-electron oscillation amplitudes, we deduced transverse emittances, momentum spread, damping times, and beam energy. Estimates of residual-gas density and composition were calculated from the measured distributions of vertical scattering angles. Combining scattering and lifetime data, we also provide an estimate of the aperture of the ring. To our knowledge, this is the first time that the dynamics of a single electron are tracked in all three dimensions with digital cameras in a storage ring.


2021 ◽  
Vol 92 (12) ◽  
pp. 123302
Author(s):  
Ji-Gwang Hwang ◽  
Gregor Schiwietz ◽  
Paul Goslawski ◽  
Markus Ries
Keyword(s):  

2021 ◽  
Vol 32 (12) ◽  
Author(s):  
Zhe Duan ◽  
Jin-Hui Chen ◽  
Hua Shi ◽  
Guang-Yi Tang ◽  
Lei Wang ◽  
...  

AbstractThe High Energy Photon Source (HEPS) is a 6 GeV diffraction-limited storage ring light source under construction. The swap-out injection is adopted with the depleted bunch recycled via high-energy accumulation in the booster. The extremely high beam energy density of the bunches with an ultra-low emittance (about 30 pm horizontally and 3 pm vertically) and high bunch charges (from 1.33 to 14.4 nC) extracted from the storage ring could cause hazardous damage to the extraction Lambertson magnet in case of extraction kicker failure. To this end, we proposed the use of a pre-kicker to spoil the bunches prior to extraction, significantly reducing the maximum beam energy density down to within a safe region while still maintaining highly efficient extractions. The main parameters of the pre-kicker are simulated and discussed.


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