共查询到20条相似文献,搜索用时 125 毫秒
1.
2.
3.
4.
二元衍射光栅式偏光器件的设计 总被引:1,自引:0,他引:1
本文利用双折射晶体刻划成的二元衍射光栅的衍射偏振特性,设计了偏光器件(可分别对o光或e光起偏);偏光分束器件(包括非对称及对称偏振分束两类),并对有关参数对设计的影响进行了讨论. 相似文献
5.
6.
7.
8.
基于等效介质理论和多层衍射元件的本体相位延迟,考虑增透膜相位调制的影响,对多层衍射光学元件的表面微结构参数进行优化;采用优化设计方法分析应用于可见光波段镀有增透膜的多层衍射光学元件。结果表明:优化设计方法在保证增透膜物理作用的前提下,实现了在设计波长处的衍射效率为100%以及在宽波段内具有高多色光积分衍射效率;该方法弥补了传统多层衍射光学元件的设计缺陷,完善了多层衍射光学元件的设计理论,为混合成像系统的设计提供了参考。 相似文献
9.
10.
11.
T. Renk 《The European Physical Journal A - Hadrons and Nuclei》2001,11(3):251-255
Following a prior analysis of measured pp elastic differential cross-sections, the impact parameter representation in terms of profile functions is calculated from
two different parametrizations of single diffractive dissociation data. The derivative of this quantity, with respect to the
collision energy squared s, measures the growth rate of the reaction's blackness. Its distribution in impact parameter space allows detailed insight
into the growth pattern of the total diffractive cross-section and the approaching unitarity limit. Comparing the results
with the elastic case, the different mechanisms of unitarization of two parametrizations are discussed.
Received: 19 January 2001 / Accepted: 11 July 2001 相似文献
12.
We have calculated the diffractive dijet cross section in low-Q
2
ep scattering in the HERA regime. The results of the calculation in LO and NLO are compared to recent experimental data of the H1 Collaboration. We find that in LO the calculated cross sections are in reasonable agreement with the experimental results. In NLO, however, some of the cross sections disagree, showing that factorization breaking occurs in that order. By suppressing the resolved contribution by a factor of approximately three, good agreement with all the data is found. The size of the factorization breaking effects in diffractive dijet photoproduction agrees well with absorptive model predictions.Received: 18 August 2004, Published online: 28 October 2004 相似文献
13.
14.
M. Begalli F. Botterweck H. Boettcher M. Charlet P. V. Chliapnikov E. A. De Wolf K. Dziunikowska A. M. F. Endler A. Eskreys W. Friebel G. R. Gulkanyan Z. S. Garutchava W. Kittel S. S. Megrabyan Th. Naumann K. Olkiewicz H. E. Roloff O. G. Tchikilev L. A. Tikhonova A. G. Tomaradze F. Verbeure R. Wischnewski S. A. Zotkin 《Zeitschrift fur Physik C Particles and Fields》1992,55(4):531-538
Results on the multiplicity structure of diffractively excited meson and proton systems in À+/K+
p interactions at 250 GeV/c are presented for diffractive masses up to about 9 GeV. The energy dependence of the average charge multiplicity and the shape of the multiplicity distribution in terms of KNO-scaling and negative binomial distribution are investigated. The diffractive systems are compared toe
+
e
–,lh and non-diffractivehh final states as suggested by modern approaches of the Pomeron-hadron collision. Systematic differences are found between diffractive meson and proton systems but also between diffraction and the reactions compared to. 相似文献
15.
The mechanisms of self-consistent interaction of tubular relativistic electronic beams with the fields of super-dimensional
periodic structure of a relativistic diffractive generator have been studied in the area of 2π-type oscillations of fundamental mode. Numerical analysis was carried out with the use of the matrix multimode method in
its nonstationary variation. The electromagnetic field profiles, their mode structure, and their radiation spectrum have been
studied. The conditions for generating frequency stabilization concerned with the longitudinal resonance of the surface spatial
harmonics and volume resonance at the cutoff frequency of the E
0n
mode of cylindrical waveguide have been revealed. 相似文献
16.
The diffractive production of high-p jets in deep-inelastic scattering is studied in the semiclassical approach. The p-spectra of
and
diffractive final states are found to be qualitatively different. For
fina states, which are produced by ‘hard’ colour-singlet exchange, the p-spectrum is much softer than for
final states, where the colour neutralization is ‘soft’. Furthermore, the two different final states can be clearly distinguished by their diffractive mass distributions. 相似文献
17.
The energy content of the charged-Kerr(CK)spacetime surrounded by dark energy(DE)is investigated using approximate Lie symmetry methods for the differential equations.For this,we consider three different DE scenarios:cosmological constant with an equation of state parameter$ωq=-2/3,quintessence DE with an equation of state parameterωc=-1,and a frustrated network of cosmic strings with an equation of state parameterωn=-1/3.To study the gravitational energy of the CK black hole surrounded by the DE,we explore the symmetries of the 2nd-order perturbed geodesic equations.It is noticed,for all the values ofω,the exact symmetries are recovered as 2nd-order approximate trivial symmetries.These trivial approximate symmetries give the rescaling of arc length parameter s in this spacetime which indicates that the energy in the underlying spacetime has to be rescaled by a factor that depends on the black hole parameters and the DE parameter.This rescaling factor is compared with the factor of the CK spacetime found in[Hussain et al.Gen.Relativ.Gravit.(2009)]and the effects of the DE on it are discussed.It is observed that for all the three values of the equation of state parameterω,the effect of DE results in decreased energy content of the black hole spacetime,regardless of values of the charge Q,spin a and the DE parameterα.This reduction in the energy content due to the involvement of the DE favours the idea of mass reduction of black holes by accretion of DE given by[Babichev et al.Phys.Rev.Lett.(2004)]. 相似文献
18.
We derive the nonlinear k
⊥ factorization for the spectrum of jets in high-mass diffractive deep inelastic scattering as a function of three hard scales—the
virtuality of the photon Q
2, the transverse momentum of the jet, and the saturation scale Q
A
. In contrast to all other hard reactions studied so far, we encounter a clash between the two definitions of the glue in
the pomeron from the inclusive spectrum of leading quarks and the small-β evolution of the diffractive cross section. This
clash casts a further shadow on customary applications of the familiar collinear factorization to a pQCD analysis of diffractive
deep inelastic scattering.
The text was submitted by the authors in English. 相似文献
19.
H. Holtmann N. N. Nikolaev A. Szczurek J. Speth B. G. Zakharov 《Zeitschrift fur Physik C Particles and Fields》1995,69(1):297-303
The excitation of the proton into undetected multiparticle states (double diffraction dissociation) is an important background
to single diffractive deep-inelastic processesep→e′p′ρ
0,e′p′J/ψ,e′p′X at HERA. We present estimates of the admixture of the double diffraction dissociation events in all diffractive events. We
find that in theJ/ψ photoproduction, electroproduction of theρ
0 at largeQ
2 and diffraction dissociation of real and virtual photons into high mass statesX the contamination of the double diffraction dissociation can be as large as ∼30%, thus affecting substantially the experimental
tests of the pomeron exchange in deep inelastic scattering at HERA. We discuss a possibility of tagging the double diffraction
dissociation by neutrons observed in the forward neutron calorimeter. We present evaluations of the spectra of neutrons and
efficiency of neutron tagging based on the experimental data for diffractive processes in the protonproton collisions. 相似文献
20.
The end-point contributions in the quark longitudinal momentum fraction of the virtual photon (
g*\gamma^*
) to vector meson (V) impact factor to the diffractive electroproduction amplitude can be factorized in terms of a generalized parton evolution
of the target parton distribution. This result is used to model the helicity amplitudes
g* p ? V p\gamma^* p \rightarrow V p
in terms of small x generalized parton distributions. 相似文献