The beam energy measurement system for the Beijing electron–positron collider

Abakumova, E.V.; Ачасов, М. Н.; Blinov, V.; Cai, Xinxia; Dong, Haiyi; Cheng-Dong, Fu; Harris, F. A.; Kaminsky, V.V.; Краснов, А. А.; Liu, Q.; Mo, X. H.; Muchnoi, N. Yu.; Nikolaev, I. B.; Qin, Q.; Qu, Haiyan; Olsen, S. L.; Pyata, E.E.; Shamov, A.G.; Shen, C. P.; Todyshev, K. Yu; Varner, G.; Wang, Yifang; Xiao, Qun; Xu, Jun; Zhang, J.Y.; Zhang, T.B.; Zhang, Y.H.; Жуков, А. А.

doi:10.1016/j.nima.2011.08.050

Cited by 64 publications

(57 citation statements)

References 20 publications

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“…Two days were used to perform the ψ scan. The mass difference between the PDG (2010) value and the measured result by BEMS is 1 ± 36 keV, the deviation of which indicates that the relative accuracy of BEMS is at the level of 2 × 10 −5 [10].…”

Section: Introductionmentioning

confidence: 87%

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Measurement of the ripple of magnet power supply and its effect to the beam energy

Zhang

Cai

et al. 2017

Radiat Detect Technol Methods

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Objective: This study is aimed at measuring the ripple of magnetic power supply of BEPCII and checking its effect to beam energy. Materials and methods: A sensor made of printed circuit board coils is designed and manufactured. The sensor was inserted into a good area region of the magnetic field with the surface perpendicular to the field force lines. The change of the magnetic field would be detected according to Faraday's law. Results: The experiment result indicates that the timedependent ripple of the magnetic field is in the magnitude of ppm. Conclusion: Such a small effect of the time-dependent ripplecan be negligibleto beam energy.

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Section: Introductionmentioning

confidence: 87%

“…Starting from the year 2007, a high accuracy beam energy measurement system (BEMS) located at the north crossing point (NCP) of BEPCII was designed, constructed and put into the commissioning at the end of 2010 [8][9][10][11]. The layout schematic of the system is shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Measurement of the ripple of magnet power supply and its effect to the beam energy

Zhang

Cai

et al. 2017

Radiat Detect Technol Methods

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“…This system has been commissioned and routinely measures the beam energy with a precision of δ E beam /E beam ≃ 10 −5 [45].…”

Section: Qcd Two-photon τ and Xy Z-meson Physicsmentioning

confidence: 99%

News from BES

Olsen¹

2012

Proceedings of 50th International Winter Meeting on Nuclear Physics — PoS(Bormio2012)

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BESIII is a new state-of-the-art 4π detector at the recently upgraded BEPCII two-ring e + e − collider at the Institute of High Energy Physics in Beijing. It has been in operation for three years, during which time it has collected the world's largest data samples of J/ψ, ψ ′ and ψ(3770) decays. These data are being used to make a variety of interesting and unique studies of lighthadron spectroscopy, precision charmonium physics and high-statistics measurements of D meson decays. Results that I describe in this report include studies of a 0 (980)-f 0 (980) mixing, an observation of a large isospin-violation in η(1405) → π 0 f 0 (980) decays, some puzzles in J/ψ and ψ ′ decays to light hadrons, the observation of two glueball candidate states in radiative J/ψ → γπ + π − η ′ decays and some recent precision measurements of η c and h c lineshapes.

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“…So we are not going to discuss here various * N.Yu.Muchnoi@inp.nsk.su technical aspects like an accuracy of the HPGe detector energy scale calibration, its response function shape, etc. The references about these issues may be found in [2] and citations therein.…”

Section: Introductionmentioning

confidence: 99%

Backscattering of Laser Radiation on Ultrarelativistic Electrons in a Transverse Magnetic Field: Evidence of MeV-Scale Photon Interference

et al. 2013

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The experiment on laser light backscattering on relativistic electrons was carried out at the VEPP-2000 collider. Laser radiation (λ0 10.6 µm) was scattered head-on the 990 MeV electrons inside the dipole magnet, where an electron orbit radius is about 140 cm. The energies of backscattered photons were measured by the HPGe detector. It was observed experimentally that due to the presence of magnetic field, energy spectrum of backscattered photons differs from the Klein-Nishina cross section. The explanation of the effect is proposed in terms of classical electrodynamics. Moreover, it appears that the exact QED predictions for the phenomenon were done more than 40 years ago.

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The beam energy measurement system for the Beijing electron–positron collider

Cited by 64 publications

References 20 publications

Measurement of the ripple of magnet power supply and its effect to the beam energy

Measurement of the ripple of magnet power supply and its effect to the beam energy

News from BES

Backscattering of Laser Radiation on Ultrarelativistic Electrons in a Transverse Magnetic Field: Evidence of MeV-Scale Photon Interference

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