Feasibility Study for a Very High Luminosity-Factory

International Journal of Modern Physics A, 2016

Similar to a super B-factory, a circular Higgs factory (CHF) will require strong focusing systems near the interaction points and a low-emittance lattice in the arcs to achieve a factory luminosity. At electron beam energy of 125 GeV, beamstrahlung effects during the collision pose an additional challenge to the collider design. In particular, a large momentum acceptance at the 2% level is necessary to retain an adequate beam lifetime. This turns out to be the most challenging aspect in the design of a CHF. In this paper, an example will be provided to illustrate the beam dynamics in a CHF, emphasizing the chromatic optics. Basic optical modules and advanced analysis will be presented. Most importantly, we will show that 2% momentum aperture is achievable.

2008

Parameters have been studied for a high luminosity e+ecollider operating at the Upsilon 4S that would deliver a luminosity of 1 to 4 x 10/cm/s. This collider, called a Super-B Factory, would use a combination of linear collider and storage ring techniques. In this scheme an electron beam and a positron beam are stored in lowemittance damping rings similar to those designed for a Linear Collider (LC) or the next generation light source. A LC style interaction region is included in the ring to produce sub-millimeter vertical beta functions at the collision point. A large crossing angle (+/24 mrad) is used at the collision point to allow beam separation. A crab-waist scheme is used to reduce the hourglass effect and restore peak luminosity. Beam currents of 1.8 A at 4 x 7 GeV in 1251 bunches can produce a luminosity of 10/cm/s with upgrade possibilities. Such a collider would produce an integrated luminosity of about 10,000 fb (10 ab) in a running year (10 sec) at the Υ(4S) resonance. ...

Linac-ring type colliders will open new windows for both energy frontier and particle factories. Concerning the first direction, these machines seem to be a sole way to TeV scale in lepton-hadron collisison at constituent level. An essential advantage of the linac-ring type lepton-hadron colliders is the possibility of the construction of γp, γA and FELγ-A colliders based on them. Today, eRHIC, THERA (TESLA on HERA) and Linac*LHC can be considered as realistic candidates for future lepton-hadron and photon hadron colliders. When it comes to factories, one can reach essentially higher luminosities comparing to standard ring-ring type machines. For example, L=10 34 cm -2 s -1 can be achieved for phi and charm-tau factories. In this presentation we briefly discuss the parameters and physics search potential of the linac-ring type machines.

2011

Parameters have been studied for a high luminosity e+e-collider operating at the Upsilon 4S that would deliver a luminosity of 1 to 4 x 10 36 /cm 2 /s. This collider, called a SuperB Factory, would use a combination of linear collider and storage ring techniques. In this scheme an electron beam and a positron beam are stored in lowemittance damping rings similar to those designed for a Linear Collider (LC) or the next generation light source. A LC style interaction region is included in the ring to produce sub-millimeter vertical beta functions at the collision point. A large crossing angle (+/-24 mrad) is used at the collision point to allow beam separation. A crab-waist scheme is used to reduce the hourglass effect and restore peak luminosity. Beam currents of 1.8 A at 4 x 7 GeV in 1251 bunches can produce a luminosity of 10 36 /cm 2 /s with upgrade possibilities. Such a collider would produce an integrated luminosity of about 10,000 fb-1 (10 ab-1) in a running year (10 7 sec) at the Υ(4S) resonance. Further possibilities include having longitudinally polarized eat the IR and operating at the J/Psi and Psi' beam energies.

IEEE Transactions on Nuclear Science, 2000

A future electron-ion collider is required to deliver a high luminosity exceeding 10 33 cm -2 s -1 per detector for probing the hadronic structure of matter. At JLab, a medium energy ring-ring collider (MEIC), based on the CEBAF SRF linac as a full-energy electron injector and a green-field design of an ion complex, is one of several proposals to meet this science need. The present MEIC design relies on high bunch repetition and high average-current colliding electron and ion beams with short bunch length and small transverse emittance for reaching the high luminosity goal. This is an approach significantly different from traditional hadron colliders. In this paper, we present a review of this luminosity concept and its impact on the accelerator design, particularly design of the ion complex for delivering required ion beams. We will also discuss some new ideas towards the realization of this high collider luminosity concept.

The SuperB international team continues to optimize the design of an electron-positron collider, which will allow the enhanced study of the origins of flavor physics. The project combines the best features of a linear collider (high singlecollision luminosity) and a storage-ring collider (high repetition rate), bringing together all accelerator physics aspects to make a very high luminosity of 10 36 cm −2 sec −1 . This asymmetric-energy collider with a polarized electron beam will produce hundreds of millions of B-mesons at the Υ(4S) resonance. The present design is based on extremely low emittance beams colliding at a large Piwinski angle to allow very low β y without the need for ultra short bunches. Use of crab-waist sextupoles will enhance the luminosity, suppressing dangerous resonances and allowing for a higher beam-beam parameter. The project has flexible beam parameters, improved dynamic aperture, and spin-rotators in the Low Energy Ring for longitudinal polarization of the electron beam at the Interaction Point. Optimized for best colliding-beam performance, the facility may also provide high-brightness photon beams for synchrotron radiation applications.