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DEGRADATION OF THE POWER OF COHERENT HARMONICS GENERATED BY THE FUNDAMENTAL MODE BUNCHING AND ELECTRON BEAM QUALITY
由基模群聚产生的相干谐波的功率减少和电子束质量

DING WU,
丁武

物理学报 , 1996,
Abstract: The thermal effect of the electron beam on the power of coherent harmonics generated by the fundamental mode bunching has been researched analytically, and compared with the mechanism generating coherent harmonics by the external source prebunching.
Coherent Beam-Beam Tune Shift of Unsymmetrical Beam-Beam Interactions with Large Beam-Beam Parameter  [PDF]
Lihui Jin,Jicong Shi,Georg H. Hoffstaetter
Physics , 2004, DOI: 10.1103/PhysRevE.71.036501
Abstract: Coherent beam-beam tune shift of unsymmetrical beam-beam interactions was studied experimentally and numerically in HERA where the lepton beam has a very large beam-beam parameter (up to $\xi_y=0.272$). Unlike the symmetrical case of beam-beam interactions, the ratio of the coherent and incoherent beam-beam tune shift in this unsymmetrical case of beam-beam interactions was found to decrease monotonically with increase of the beam-beam parameter. The results of self-consistent beam-beam simulation, the linearized Vlasov equation, and the rigid-beam model were compared with the experimental measurement. It was found that the coherent beam-beam tune shifts measured in the experiment and calculated in the simulation agree remarkably well but they are much smaller than those calculated by the linearized Vlasov equation with the single-mode approximation or the rigid-beam model. The study indicated that the single-mode approximation in the linearization of Vlasov equation is not valid in the case of unsymmetrical beam-beam interactions. The rigid-beam model is valid only with a small beam-beam parameter in the case of unsymmetrical beam-beam interactions.
Experimental investigation of a coherent quantum measurement of the degree of polarization of a single mode light beam  [PDF]
Matthieu Legre,Mark Wegmuller,Nicolas Gisin
Physics , 2002, DOI: 10.1080/09500340308235513
Abstract: A novel method for the direct measurement of the degree of polarization is described. It is one of the first practical implementations of a coherent quantum measurement, the projection on the singlet state. Our first results demonstrate the successful operation of the method. However, due to the nonlinear crystals used presently, its application is limited to spectral widths larger than ~8nm.
A new possibility to monitor collisions of relativistic heavy ions at LHC and RHIC  [PDF]
R. Engel,A. Schiller,V. G. Serbo
Physics , 1995,
Abstract: We consider the radiation of particles of one bunch in the collective field of the oncoming bunch, called coherent bremsstrahlung (CBS). The main characteristics of CBS for LHC (in the Pb-Pb mode) and for RHIC are calculated. At LHC about $3.9 10^8 dE_\gamma/E_\gamma$ photons per second are expected for photon energies $E_\gamma \stackrel{<} {\sim} E_c= 93 $ eV. It seems that CBS can be a potential tool for optimizing collisions and for measuring beam parameters. The bunch length can be found from the critical energy of the CBS spectrum; the transverse bunch size is related to the photon rate. A specific dependence of photon rate on the impact parameter between the beams allows for a fast control over the beam displacement.
Electron Beam for LHC  [PDF]
Mieczyslaw Witold Krasny
Physics , 2004,
Abstract: A method of delivering a monochromatic electron beam to the LHC interaction points is proposed. In this method, heavy ions are used as carriers of the projectile electrons. Acceleration, storage and collision-stability aspects of such a hybrid beam is discussed and a new beam-cooling method is presented. This discussion is followed by a proposal of the Parasitic Ion-Electron collider at LHC (PIE@LHC). The PIE@LHC provides an opportunity, for the present LHC detectors, to enlarge the scope of their research program by including the program of electron-proton and electron-nucleuscollisions with minor machine and detector investments.
Long Range Beam-beam Effects in the LHC  [PDF]
W. Herr,X. Buffat,R. Calaga,R. Giachino,G. Papotti,T. Pieloni,D. Kaltchev
Physics , 2014, DOI: 10.5170/CERN-2014-004.87
Abstract: We report on the experience with long-range beam--beam effects in the LHC, in dedicated studies as well as the experience from operation. Where possible, we compare the observations with the expectations.
First CMS Results with LHC Beam  [PDF]
Toyoko J. Orimoto,for the CMS Collaboration
Physics , 2009,
Abstract: The Compact Muon Solenoid (CMS) Experiment is a general purpose particle detector experiment located at the Large Hadron Collider (LHC) at CERN. In 2008, the LHC beam was commissioned and successfully steered through the CMS detector. First results from CMS with beam data are described, focusing on detector commissioning with beam data, from beam halo studies with the endcap muon system to displays of "beam splash" events, in which the proton beam was stopped by an upstream collimator.
Four-mode coherent-entangled state and its application

Li Hong-Qi,Ren Ting-Qi,Zhang Yun-Hai,Xu Xing-Lei,

中国物理 B , 2012,
Abstract: A new kind of four-mode continuous variable coherent-entangled state is proposed in the Fock space by using the technique of integration within an ordered product, which exhibits both the properties of a coherent state and an entangled state, and spans a complete and orthonormal representation. The conjugate state of the four-mode continuous variable coherent-entangled state is derived by using the Fourier transformation. Moreover, a simple experimental protocol of generating a four-mode continuous variable coherent-entangled state is proposed by using beam splitters. As applications of this four-mode continuous variable coherent-entangled state, a four-mode entangled state and a four-mode squeezing-Fresnel operator are constructed.
Observations of beam-beam effects at the LHC  [PDF]
G. Papotti,X. Buffat,W. Herr,R. Giachino,T. Pieloni
Physics , 2014,
Abstract: This paper introduces a list of observations related to the beam-beam interaction that were collected over the first years of LHC proton physics operation (2010-12). Beam-beam related effects not only have been extensively observed and recorded, but have also shaped the operation of the LHC for high-intensity proton running in a number of ways: the construction of the filling scheme, the choice of luminosity levelling techniques, measures to mitigate instabilities, and the choice of settings for improving performance (e.g. to reduce losses), among others.
Coherent quantum measurement for the direct determination of the degree of polarization and Polarization Mode Dispersion compensation  [PDF]
N. Gisin
Physics , 2000, DOI: 10.1080/09500340108232470
Abstract: An example of a coherent measurement for the direct evaluation of the degree of polarization of a single-mode optical beam is presented. It is applied to the case of great practical importance where depolarization is caused by polarization mode dispersion. It is demonstrated that coherent measurement has the potential of significantly increasing the information gain, compared to standard incoherent measurements.
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