A realistic approach to calculate the transport matrix in RF cavities is developed. It is based on joint solution of equations of longitudinal and transverse motion of a charged particle in an electromagnetic field of the linac. This field is a given by distribution (measured or calculated) of the component of the longitudinal electric field on the axis of the linac. New approach is compared with other matrix methods to solve the same problem. The comparison with code ASTRA has been carried out. Complete agreement for tracking results for a TESLA-type cavity is achieved. A corresponding algorithm will be implemented into the MARS15 code.

The code SCREAM - SuperConducting RElativistic particle Accelerator siMulation - was significantly modified and improved. Some misprints in the formulae used have been fixed and a more realistic expression for the vector-sum introduced. The realistic model of Lorentz-force detuning (LFD) is developed and will be implemented to the code. A friendly GUI allows various parameters of the simulated problem to be changed easily and quickly. Effective control of various output data is provided. A change of various parameters during the simulation process is controlled by plotting the corresponding graphs 'on the fly'. A large collection of various graphs can be used to illustrate the results.

A new vacuum-insulated tandem accelerator capable of producing a 5-mA proton beam with energy up to 2 MeV was used to produce a mono-energetic beam of 9.17-MeV gamma rays from the resonant production reaction, 13C(p,γ)14N, at 1.76 MeV. A graphite target enriched with 13C capable of withstanding the proton beam power was designed and fabricated. The 9.17-MeV gamma rays were subsequently resonantly absorbed in 14N via the inverse reaction, 14N(γ,p)13C. The data acquisition system to measure the resonance absorption in nitrogen includes a BGO detector and a goniometer and collimator assembly that rotate around the axis produced by the intersection of the proton beam and the production target. The accuracy of rotation of the detector around the target is approximately 0.1°. The results of the resonance gamma ray absorption measurements are presented to demonstrate the feasibility of the method to sensitively and selectively detect high concentrations of nitrogen, comparable to those found in most explosives.

The results of experiments on generating of resonance gamma-quanta using vacuum insulation tandem accelerator (VITA) are presented. The accelerator is able to produce proton beam with particles energy up to 2 MeV and 5 mA current. The resonance gammas have generated in the carbon target enriched with C-13 isotope with help of C-13(p,gamma)N-14 nuclear reaction. Registration of resonance gamma-quantas is carried out by goniometer and collimator assembly, that capable to be rotated around the target with 0.1 degrees accuracy. The experimental results on absorption of resonance gamma-quanta with energy 9.17 MeV are presented.

Research towards high-energy electron cooling of RHIC is presently underway at Brookhaven National Laboratory. In this new regime, electron cooling has many unique features and challenges. At high energy, due to the difficulty of providing operational reserves, the expected cooling times must be estimated with a high degree of accuracy compared to extant low-energy coolers. To address these high-energy cooling issues, a detailed study of cooling dynamics based on computer codes and experimental benchmarking was launched at BNL. In this paper, we present an update of the high-energy cooling dynamics studies. We also include a discussion of some features of electron cooling relevant to colliders, such as the effects of rapid cooling of the beam core and an accurate treatment of the intra-beam scattering for such cooled ion distributions.

A complex of electron-positron factories, including cτ and Φ factories, is under construction at BINP in Novosibirsk [1]. To provide the effective operation of this installation, the injector complex that comprises the pre-injector and the damping ring is being worked out. This paper presents the current status of the injector complex.

The connection between four hardware and software components of the control system an accelerator and/or any type of large physical facilities is analyzed. Software structures used in the control systems are considered. A thesis about the software products "authorship" distribution between professional programmers and physicists working at accelerators is formulated.

The total cross section for γγ→hadrons was measured as a function of the invariant massW of the system (1.25 to 4.25 GeV) at thee+e−-collider VEPP-4 with the detector MD-1. For the first time the data were obtained by detecting both scattered leptons with almost zero emission angles. The mean squared four momentum transfer 〈q2〉 is −0.005 GeV2, the rmsW resolution is 100–250 MeV. The data on the mean charged multiplicity 〈n C 〉 are well described by the function 〈n C 〉=(1.62 ±0.37)+(1.83±0.45)·ln(W(GeV)). TheW dependence of the total cross section is consistent with the theoretical prediction σ(nb)=240+270/W(GeV).

The results of a search for narrow resonances ine+e− annihilation at centre-of-mass energies between 7.23 and 10.34 GeV are presented. The experiment was performed using the MD-1 detector at the VEPP-4 storage ring. The total luminosity integral of 16 pb−1 was taken. There is no evidence that new states exist. The upper limits on the leptonic widthΓ ee of possible resonances are less, by a factor of 10–80, than theΓ ee for the ϒ(1S) meson.

Results of a measurement of the two-photon widths of the a2, eta', eta with the detector MD - 1 at the e+ e- collider VEPP-4 are presented. The specific feature of this experiment is tagging of at least one scattered electron. The following results have been obtained GAMMA-gamma-gamma-(a2) = 1.26 +/- 0.26 +/- 0.18 keV, GAMMA-gamma-gamma-(eta') = 4.6 +/- 1.1 +/- 0.6 keV, GAMMA-gamma-gamma-(eta) = 0.51 +/- 0.12 +/- 0.05 keV.

The results of an experiment on the search for ξ(2.2) andX(2.2) in the radiative decays of the Υ-meson are presented. The experiment was carried out with the MD-1 detector at the VEPP-4 collider. An upper limitB(Υ→γξ)B(ξ→K+K−)−4 is obtained at 90% C.L. Results are presented on the search for the decay Υ→γX, X→ ϕϕ not previously investigated. For this decay the upper limitB(Υ→γX)B(X→ϕϕ)−3 is obtained at 90% C.L.

The results of an experiment on the search for ξ(2.2) andX(2.2) in the radiative decays of the Υ-meson are presented. The experiment was carried out with the MD-1 detector at the VEPP-4 collider. An upper limitB(Υ→γξ)B(ξ→K+K−)<2·10−4 is obtained at 90% C.L. Results are presented on the search for the decay Υ→γX, X→ ϕϕ not previously investigated. For this decay the upper limitB(Υ→γX)B(X→ϕϕ)<3·10−3 is obtained at 90% C.L.

The method of resonance depolarization has been used for the absolute energy calibration of storage ring VEPP-4. The beam polarization was measured by the up-down asymmetry of the synchrotron radiation back-scattered on the colliding beam. By scanning the ϒ resonance with the MD-1 detector, we obtained a massM=9460.59 ±0.12 MeV.

A new method for measuring the polarization of e+e− in storage rings is described. It is based on the scattering of synchrotron radiation on the colliding beam. The method is simple in operation and allows a simultaneous measurement of the polarization of the electron and positron beam. This method was applied to the energy calibration of the storage ring VEPP-4 in the high precision measurements of the ϒ-mesons' masses with MD-1 detector.