PEP II status and plans

Abstract

The PEP I1 B-Factory project is an e+e-colliding beam storage ring complex to be built on the SLAC site. PEP I1 is designed to provide a luminosity of 3 x 1033 cm-%-l at a center of mass of 10.6 GeV with unequal energy beams of 3.1 and 9.0 GeV. The goal is to study CP violation in the B meson system. The project is being built by a collaboration of the Stanford Linear Accelerator Center, Lawrence Berkeley Laboratory, and Lawrence Livermore National Laboratory. DOE construction authorization was given in 1994. The asymmetric beam energies require two storage rings with the low energy ring (LER) supported above the high energy ring (HER). There will be one interaction point with head-on collisions, requiring magnetic separation of the beams, low values of the beta functions, and magnetic elements inside the solenoid of the BABAR2 physics detector. The high luminosity necessitates a large number of bunches requiring advances in the vacuum design, damped RF cavities, and bunch-by-bunch feedback systems. The injection scheme uses the high current, low emittance, on-energy beams available from the SLAC linac. At present, the old PEP tunnel has been cleared and installation of the high energy ring has started. Several of the many papers on PEP I1 at this conference are listed in References 3-23.

Conservation Laws and Symmetries

“…The SuperB accelerator is a high-luminosity two-ring asymmetric energy e + e − collider which is going to be built at the Tor Vergata University campus in Italy (see Figure 2.4). This project is a logical continuation of the e + e − colliders built at SLAC in California, USA (PEP-II [8]) and at KEK in Tsukuba, Japan (KEKB [9]). The key ideas and technologies, which are used in the design of this accelerator come from successful recent tests of the new concepts in the beam manipulation in the interaction region (IP) called "crabbed waist" performed at the DAΦNE collider at INFN in Frascati, Italy (2008) (see [10] for more details).…”

The Largest Accelerators and Colliders of Their Time

“…PEP-II at SLAC was an asymmetric collider with two rings made to measure the properties of the b quark sector, the CP violation in the BB system, and to confirm the CKM matrix [112]. Injection was made at full energy at up to 30 Hz from the SLAC 3 km linac with the SLC e − and e + damping rings and either e − or e + accelerated on any given linac pulse.…”

Status of the PEP-II B-Factory High Energy Ring

“…A list of the important HER machine parameters is given in Table 1. The facility is under construction in the PEP tunnel at SLAC [1,2].…”