摘要:

A preliminary parameter list and the beam‐beam interaction region geometry and beam envelopes for the B‐meson factory planned at Cornell University are presented. (AIP)

ISSN:0094-243X    

DOI:10.1063/1.39755

出版商:AIP    

年代:1990

数据来源: AIP

摘要:

We report upon a feasibiity study for an asymmetrice+−e−‐collider with beam energies of 10 GeV and 2.8 GeV. The PETRA storage ring is to be used to store the high energy beam. For the low energy beam, a new storage ring of 288 m circumference is to be built. The facility is designed for a peak luminosity forL=3⋅1033cm−2s−1.

ISSN:0094-243X    

DOI:10.1063/1.39756

出版商:AIP    

年代:1990

数据来源: AIP

摘要:

The present machine design of the future asymmetric B‐factory at KEK is reviewed. Beam energies and a design luminosity are chosen as 8×3.5 GeV2and 1×1034/cm2/sec in due consideration of requirements from physics experiments. In the design, it is aimed to squeeze the vertical beta‐function at IP (&bgr;*y) to 1 cm. The beam‐beam limit is assumed to be 0.05 with the requirement that the bunch length should be half of &bgr;*y, i.e., 0.5 cm. Flat beams are chosen. In order to attain the design luminosity, beam currents of 2.6 A for the 3.5 GeV ring and 1.1 A for the 8 GeV ring are necessary. An all RF buckets filling scheme and a crab crossing scheme are adopted to realize the short bunches and to decrease RF voltages. The damped cavity is adopted to suppress the coupled bunch instability. Growth rates of the instability are estimated in the case that the damped cavities are used. Further extensive studies and R&D’s are necessary to realize the design luminosity.

ISSN:0094-243X    

DOI:10.1063/1.39757

出版商:AIP    

年代:1990

数据来源: AIP

摘要:

Brief information about the B‐factory, which is under the active study in the Institute of Nuclear Physics in Novosibirsk is presented.

ISSN:0094-243X    

DOI:10.1063/1.39758

出版商:AIP    

年代:1990

数据来源: AIP

摘要:

This report addresses the feasibility of designing and constructing an asymmetric B‐Factory—based on the PEP storage ring at SLAC—that can begin operation at a luminosity of 3×1033cm−2s−1and could ultimately reach even higher luminosity. Such a facility, operating at the &Ugr;(4S) resonance, could be used to study mixing, rare decays, and CP violation in the BB system, and could also study tau and charm physics. The essential accelerator physics, engineering, and technology issues that must be addressed to successfully build this exciting and challenging facility are identified, and possible solutions, or R&D activities that will reasonably lead to such solutions, are described.

ISSN:0094-243X    

DOI:10.1063/1.39759

出版商:AIP    

年代:1990

数据来源: AIP

摘要:

A preliminary survey of the machine parameters required to achieve a luminosity of 1034cm−2s−1at the &Ugr;(4S) resonance in a linac‐on‐ring collider has been made. The low emittance electron source and recirculating superconducting linac based on LEP cavities appears to be within the scope of present technologies. The high‐current, low‐emittance positron storage ring with its low‐beta collision point can be broadly specified but a more detailed feasibility study is needed. Simulation of the beam‐beam effect indicates that the beam‐beam limit may be higher than in equivalent ring‐on‐ring colliders. The heavily disrupted electron beam poses no obvious problem.

ISSN:0094-243X    

DOI:10.1063/1.39761

出版商:AIP    

年代:1990

数据来源: AIP

摘要:

The beam dynamics issues presented by a high‐luminosity asymmetric electron collider ring (such as is required for a B meson factory) are described. Attention is focused on lattice aspects, on single‐beam effects, and on beam‐beam interaction effects. The over‐all conclusion is that a facility with a beam of (about) 3 GeV in one ring and a beam of (about) 9 GeV in a second ring having a luminosity of between 1033and 1034cm−2s−1is a feasible concept.

ISSN:0094-243X    

DOI:10.1063/1.39762

出版商:AIP    

年代:1990

数据来源: AIP