共查询到20条相似文献,搜索用时 15 毫秒
1.
Yu. V. Shestakov L. M. Barkov V. F. Dmitriev R. A. Golovin V. N. Kudryavtsev B. A. Lazarenko S. I. Mishnev D. M. Nikolenko I. A. Rachek R. Sh. Sadykov V. N. Stibunov D. K. Toporkov L. I. Shekhtman S. A. Zevakov 《Physics of Particles and Nuclei》2014,45(1):338-340
At BINP the construction of the tagging system for almost-real photons (TS) is in progress. The energy of tagging photons can be up to 1.5 GeV. The projected energy resolution of TS is better then 1%. For at least a half of photons the linear polarization can be determined. The tagging system will extend the possibilities for photoreaction studying at VEPP-3 significantly. TS would allow to perform a complete kinematics reconstruction, thus permitting a reliable rejection of the background processes; to extend the measurements to higher photon energy; to enabling Σ-asymmetry measurements and double polarization experiments. 相似文献
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D. M. Nikolenko H. Arenh?vel J. Arrington L. M. Barkov S. L. Belostotski H. de Vries R. Gilman A. V. Gramolin V. F. Dmitriev S. A. Zevakov I. V. Karnakov B. A. Lazarenko S. I. Mishnev N. Yu. Muchnoi V. V. Nelyubin A. V. Osipov D. H. Potterveld I. A. Rachek R. Sh. Sadykov V. N. Stibunov D. K. Toporkov R. J. Holt Yu. V. Shestakov L. I. Shekhtman 《Physics of Atomic Nuclei》2010,73(8):1322-1338
An overview of the recently completed, current, and planned experiments with internal targets at the VEPP-3 electron-positron storage ring in Novosibirsk is given. The results of the experiment to separately measure the deuteron form factors in elastic ed scattering in the range of momentum transfer Q 2 = 8?15 fm?2 are provided. The results of measuring the tensor analyzing power components of the tensor-polarized deuteron photodisintegration reaction in the range of γ-quantum energies E γ = 25?600 MeV are presented. The tensor analyzing powers of the coherent photoproduction of a neutral pion on a tensor-polarized deuteron have been measured for the first time. The almost-real photon tagging system being created is discussed. The status of the experiment under way to determine the contribution of two-photon exchange to the elastic ep scattering cross section is described. 相似文献
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F. A. Emanov A. V. Andrianov K. V. Astrelina V. V. Balakin A. M. Barnyakov O. V. Belikov D. E. Berkaev M. F. Blinov Yu. M. Boimelshtain D. Yu. Bolkhovityanov N. S. Dikansky A. R. Frolov G. V. Karpov A. S. Kasaev A. A. Kondakov I. V. Kuptsov I. A. Koop G. Ya. Kurkin R. M. Lapik N. N. Lebedev A. E. Levichev Yu. I. Maltseva A. A. Murasev D. A. Nikiforov A. V. Pavlenko V. V. Rashchenko S. L. Samoylov S. V. Vasiliev I. M. Zemlyansky Yu. A. Rogovsky S. A. Krutikhin A. Yu. Martinovsky S. V. Motigin A. M. Pilan I. K. Sedliarov A. G. Tribendis 《Physics of Particles and Nuclei Letters》2018,15(7):720-723
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S. A. Zevakov V. V. Gauzshteyn R. A. Golovin A. V. Gramolin V. F. Dmitriev R. R. Dusaev B. A. Lazarenko S. I. Mishnev D. M. Nikolenko I. A. Rachek R. Sh. Sadykov V. N. Stibunov D. K. Toporkov Yu. V. Shestakov 《Bulletin of the Russian Academy of Sciences: Physics》2014,78(7):611-615
An experiment to measure component T 20 of the tensor analyzing power for the coherent photo-production of neutral pions on polarized deuterons is described. The measurements cover the photon energies in the ranges E γ = 200–500 MeV and E γ = 300–600 MeV, and the emission angles of neutral pions in the ranges = \(\theta _{\pi ^0 }^{c.m.} \) = 100°–140° and = \(\theta _{\pi ^0 }^{c.m.} \) = 60°–65°, respectively. The experiment uses a hyperfine internal gas polarized target. Detectors of neutral pions and deuterons register these particles in coincidence. The target’s degree of polarization and luminosity is measured by detecting elastic electron-deuteron scattering at low momentum transfer. A selection of the preliminary results is presented. 相似文献
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Physics of Particles and Nuclei Letters - The distributed beam-loss monitor based on the Cherenkov radiation in an optical fiber installed on the e–e+ Injection Complex at the Budker... 相似文献
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Formulas for calculating the intensity of intrabeam scattering of electrons in the Born approximation for the one- and two-dimensional collision models have been obtained for the nonrelativistic and relativistic cases. The Baier-Katkov-Strakhovenko two-dimensional relativistic model with Coulomb corrections has been analyzed. Formulas in the ultrarelativistic limit have been obtained using this model. Different models have been compared. The intensities of Touschek electrons and the polarization contribution have been calculated under the conditions of the detection of scattered particles at the VEPP-4M storage ring. The calculations have been compared to experimental data. 相似文献
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Wang F Cheever D Farkhondeh M Franklin W Ihloff E van der Laan J McAllister B Milner R Tschalaer C Wang D Wang DF Zolfaghari A Zwart T Carr GL Podobedov B Sannibale F 《Physical review letters》2006,96(6):064801
The generation of brilliant, stable, and broadband coherent synchrotron radiation (CSR) in electron storage rings depends strongly on ring rf system properties such as frequency and gap voltage. We have observed intense coherent radiation at frequencies approaching the THz regime produced by the MIT-Bates South Hall Ring, which employs a high-frequency S-band rf system. The measured CSR spectral intensity enhancement with 2 mA stored current was up to 10,000 times above background for wave numbers near 3 cm(-1). The measurements also uncovered strong beam instabilities that must be suppressed if such a very high rf frequency electron storage ring is to become a viable coherent THz source. 相似文献
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K. V. Astrelina M. F. Blinov T. A. Vsevolozhskaya N. S. Dikanskii F. A. Emanov R. M. Lapik P. V. Logachev P. V. Martyshkin A. V. Petrenko T. V. Rybitskaya A. N. Skrinskii S. V. Shiyankov T. A. Yaskina 《Journal of Experimental and Theoretical Physics》2008,106(1):77-93
A source of positrons allowing 5 × 108 positrons accelerated to the energy of 70 MeV to be produced per pulse has been developed. The process of electron-positron pair production in an electromagnetic shower is used for production of positrons. The electromagnetic shower is generated in a tantalum target by a beam of 2 × 1010 electrons with energy 270 MeV. A high efficiency of positron collection (positron yield Y ≈ 0.1 GeV?1) is ensured by a unique design of the matching device. 相似文献
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针对金属橡胶构件的非线性特性及结构不同时弹性阻尼力学性能不同的特点, 利用实验和理论相结合的方法建立了金属橡胶构件迟滞回线边界变形过程力学模型, 推导了不同相对密度金属橡胶构件非线性迟滞恢复力表达式. 分析了简谐激励载荷作用下金属橡胶阻尼环动力学特性, 对该阻尼环进行了实验研究, 研究了存在预变形情况下阻尼环的弹性阻尼性能, 实验和理论分析结果基本一致, 为该种阻尼环的实际应用奠定了理论基础.
关键词:
金属橡胶构件
力学模型
非线性迟滞恢复力 相似文献
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Astrelina K. Andrianov A. Balakin V. Barnyakov A. Belikov O. Berkaev D. Blinov M. Boymelshteyn Yu. Bolkhovityanov D. Borin V. Butakov A. Vasilev S. Emanov F. Karpov G. Kasaev A. Kondakov A. Koop I. Kot N. Kurkin G. Lapik R. Lebedev N. Levichev A. Maltseva Yu. Martynovskiy A. Martyshkin P. Meshkov O. Motygin S. Murasev A. Myslivets V. Nikiforov D. Pilan A. Rogovsky Yu. Samoylov S. Tribendis A. Frolov A. Tsyganov A. 《Physics of Particles and Nuclei Letters》2020,17(4):409-414
Physics of Particles and Nuclei Letters - The VEPP-5 injection complex, consisting of two linacs and a damping storage ring, delivers electron and positron beams to the VEPP-4M and VEPP-2000... 相似文献
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北京大学高功率耦合器谐振环锻炼平台是对北京大学1.3 GHz超导加速器的耦合器进行高功率测试和锻炼的平台,通过谐振环与信号源谐振来产生高功率。在谐振环工作过程中,由于外界扰动会使其共振频率发生变化,故需要对谐振环路进行频率锁定,从而维持其与信号源的共振。将PDH(Pound-Drever-Hall)技术应用在此锻炼平台上,用以锁定微波信号源与谐振环的频率。实验验证表明,该PDH反馈系统能有效维持谐振环的高增益。 相似文献
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A. V. Dar’in I. A. Kalugin Ya. V. Rakshun 《Bulletin of the Russian Academy of Sciences: Physics》2013,77(2):182-184
Combining the features of synchrotron radiation (low angular divergence and continuous spectrum, natural polarization, and high intensity) with the use of modern X-ray optics (polycapillary lenses) and registering devices results in a new quality of analysis: measuring picogram concentrations of a broad set of elements with micron spatial resolution. Using a dedicated experimental station and developed methodologies, numerous scanning microanalyses of bottom sediments is performed to obtain a time series of geochemical indicators of paleoclimate in the Central Asian region. The detection limit under optimum conditions is 5 × 10?5% with a spatial resolution of ~100 μm. 相似文献
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Balakin V. Astrelina K. Berkaev D. Emanov F. Rogovsky Yu. 《Physics of Particles and Nuclei Letters》2020,17(4):557-560
Physics of Particles and Nuclei Letters - Work on developing new software tools for monitoring and controlling the VEPP-5 damping-ring (DR) operation with upgraded stations of beam-position sensors... 相似文献
16.
The electron dynamics in a quasi-one-dimensional ballistic ring that is subjected to two rf electric fields that have mutually
orthogonal polarizations and lie in the plane of the ring is considered. The mean dipole moment and the ring radiation intensity
are calculated. The condition for spontaneous symmetry breaking, as a result of which the dipole moment of the system acquires
a constant component, is found. 相似文献
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We propose a radio frequency(RF)transfer technique with passive phase noise compensation over a fiber-optic ring.By adopting different frequencies and same wavelength transmission and double sideband(DSB)with carrier suppression(DSBCS)modulation,the impact of backscattering can be effectively suppressed.A stable RF signal can be obtained via frequency mixing at an arbitrary access site along the fiber-optic ring.As the two directional transmissions adopt the same fiber and same wavelength from the same laser,the bidirectional propagation symmetry can be maximally guaranteed.We experimentally demonstrate 2 GHz RF signal transfer along a 100 km standard single-mode fiber-optic ring. 相似文献
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Sensitive devices such as resonant sensors and radio frequency micro-electro-mechanical system (RF-MEMS) filters etc., require high Quality factors (Q-factors) defined as the ratio of total system energy to dissipation that occurs due to various damping mechanisms. Also, thermoelastic damping is considered to be one of the most important factors to elicit energy dissipation due to the irreversible heat flow of oscillating structures in the micro scales. In this study, the Q-factor for thermoelastic damping is investigated in rotating thin rings with in-plane vibration. First, in order to obtain the temperature profile of the model, a heat conduction equation for the thermal flow across the radial direction is solved based on the bending approximation so-called in-extensional approximation of the ring. Using the temperature distribution coupled with a displacement, a governing equation of the ring model can then be derived. Eventually, an eigen-value analysis is performed to obtain the natural frequency of rotating thin rings, and the analytical and numerical values of Q-factors can then be determined by the definition. Furthermore, the effects of rotating speed, dimensions of the ring, mode numbers and ambient temperatures on the Q-factor are discussed in detail. 相似文献