摘要:

The resonances in the toroidal beam pipes of the asymmetric storage rings are computed. The change in tunes due to pipe’s curvature is studied. These effects are found to be negligibly small. The issue of free‐space radiation is discussed.

ISSN:0094-243X    

DOI:10.1063/1.39789

出版商:AIP    

年代:1990

数据来源: AIP

摘要:

The aim of the is note is to estimate the effects, if any, of trapped ions in the e‐rings of a B‐Factory (in the ISR ring) machine, actually under study.Figures found in this note will probably be obsolete, at the time of its publication, as the machine and beam parameters are still, at the moment, in a ‘‘transitory state’’.However formulae and qualitative reasoning, given here as a reminder, should still be valid (we hope).

ISSN:0094-243X    

DOI:10.1063/1.39790

出版商:AIP    

年代:1990

数据来源: AIP

摘要:

In order to attain high luminositye+e−colliding beams proposed for new B Factories a consequence is a beam tune shift at the beam‐beam interaction point. Computer simulations have yielded results for unequal beam energies whereby beam blow up occurs for one beam and not for the other. The solution proposed in this paper is to bring the beam‐beam interaction into the ‘‘strong‐strong’’ regime. (AIP)

ISSN:0094-243X    

DOI:10.1063/1.39746

出版商:AIP    

年代:1990

数据来源: AIP

摘要:

A new method of calculating the beam‐beam force for High Energy Colliding Beam Machines is given and the method does not assume that the particle distribution is gaussian. With the method, the coherent beam‐beam tune shift as a function of beam current is reproduced for the horizontal case. (AIP)

ISSN:0094-243X    

DOI:10.1063/1.39748

出版商:AIP    

年代:1990

数据来源: AIP

摘要:

For the KEK B factory, the necessary horizontal separations between beams at the peripheral collision points are given by means of the rigid Gaussian model. For the present design parameters, (1) in the head‐on collision scheme, bunches can be filled in every three buckets and 2 mm separation is enough at the point 1.8 meter distant from the interaction point, (2) all buckets can be filled if the crossing has an angle of 3 mrad (half angle). The limitation comes from a reduction of the luminosity and the excitation of the closed orbit at the arc and (1+2). The combination of (1) and (2) with crossing angle of 2 mrad and 0.6 T separation magnets (all buckets being filled) provides enough luminosity and enough space for the final focus system.

ISSN:0094-243X    

DOI:10.1063/1.39791

出版商:AIP    

年代:1990

数据来源: AIP

摘要:

Simulation studies of the influence of long bunches on the beam‐beam effect in particle colliders suggest that, despite the risk from synchro‐betatron resonances, the attainable luminosity may be greater than that obtained for short bunches.

ISSN:0094-243X    

DOI:10.1063/1.39750

出版商:AIP    

年代:1990

数据来源: AIP

摘要:

Additional methods to study the dynamics of the beam‐beam interaction are presented. (AIP)

ISSN:0094-243X    

DOI:10.1063/1.39751

出版商:AIP    

年代:1990

数据来源: AIP

摘要:

A consistent set of parameters is given for a B‐factory based on collisions of an electron beam from a SRF linac with the positron beam in a storage ring. An optimized lattice, an impedance estimate, a study of beam stability, and a discussion of collisions with large disruption parameters are included.

ISSN:0094-243X    

DOI:10.1063/1.39752

出版商:AIP    

年代:1990

数据来源: AIP

摘要:

Superconducting resonant cavities can economically provide the voltages needed to achieve the short bunches and high luminosity required for thee−e+colliders proposed to produce B mesons. In this article a report is given of the progress in the development of a superconducting RF system for a B‐factory. (AIP)

ISSN:0094-243X    

DOI:10.1063/1.39753

出版商:AIP    

年代:1990

数据来源: AIP

摘要:

This is a feasibility study of the proposed B‐meson factory in the CERN ISR tunnel. Machine parameters, the lattice, interaction region, RF system, beam instabilities, vacuum system, and background radiation are discussed. (AIP)

ISSN:0094-243X    

DOI:10.1063/1.39754

出版商:AIP    

年代:1990

数据来源: AIP