Crab Crossing in a Large Hadron Collider,
Abstract
Since its invention by Palmer in 1988, crab crossing has been explored by many people for both linear and storage ring colliders to allow for an angle crossing without a loss of luminosity. Various crab crossing scenarios have been incorporated in the design of newly proposed linear colliders and B-factory projects. For a hadron collider, this scheme can also be employed to lower beta* at the interaction point for a higher luminosity. In this paper, we first review the principle and operational requirements of various crab crossing schemes for storage ring colliders. A Hamiltonian formalism is developed to study the dynamics of crab crossing and the related synchro-betatron coupling. Requirements are obtained for the operational voltage and frequency of the crab cavities, and for the accuracy of voltage matching and phase matching of the cavities. For the recently proposed high-field hadron collider, a deflection crabbing scheme can be used to reduce beta* from 0.1 m to 0.05 m and below, without a loss of luminosity due to angle crossing. The required voltage of the storage rf system is reduced from 100 MV to below 10 MV. With the same frequency of 379 MHz operating in a transverse mode, the required voltage of the crab cavities is about 3.2^4.4 MV. The required accuracy of voltage and betatron-phase matching is about 1%.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1996
- Accession Number
- ADA355106
Entities
People
- Jie Wei
Organizations
- Brookhaven National Laboratory