The Cornell-BNL ERL Test Accelerator - status and opportunities

概要

The Cornell-BNL ERL Test Accelerator (CBETA) is under construction at the Cornell Laboratory for Accelerator-based ScienceS and Education (CLASSE). Electrons pass through an SRF cryomodule 4 times during acceleration from 6 MeV to 150 MeV, and then decelerate 4 times. Most of the 70 m circumference consists of a return loop with a single beam pipe, using Halbach-style permanent magnet quadrupoles configured with very strong FFA optics to enable a very large momentum acceptance.

CBETA will be the first accelerator to combine all four of its key features - 4 passes, SRF, FFA optics, Halbach magnets - although these have all been successful, individually, in other accelerators. The FFA optics are unique in demonstrating lowsymmetry adiabatic transitions from arc to straight. These technologies could be used in a next generation Electron Ion Collider (EIC) if it is sited at BNL as eRHIC.

A Fractional Arc Test was performed with beam during March and April 2018. The final “phase 1” beam commissioning will occur in late 2019 and early 2020. A later “phase 2” CBETA development, if funded, could be used to perform accelerator physics R&D at Cornell. There are opportunities for accelerator physics collaboration, in phase 1 beam commissioning, in the design of CBETA phase 2 (and similar ERLs), and in EIC.

CBETA is funded solely by the New York State Energy Research & Development Agency, NYSERDA. https://www.classe.cornell.edu/CBETA_PM