Alexandre Novokhatski

Parameters of a Super-B-Factory Design

Parameters are being studied for a high luminosity e+e-collider operating at the Upsilon 4S that would deliver a luminosity in the range of 7 to 10 x 1035/cm2/s. Particle physics studies dictate that a much higher luminosity collider than the present B-Factory accelerators will be needed to answer future new key physics questions. The success of the present B-Factories, PEP-II and KEKB, in producing unprecedented luminosity with very short commissioning times has taught us about the accelerator physics of asymmetric e+e-colliders in a new parameter regime. Such a collider could produce an integrated luminosity of 10,000 fb-1(10 ab-1) in a running year. A Super-B-Factory [1-8] with 30 to 50 times the performance of the present PEP-II accelerator would incorporate a higher frequency RF system, lower impedance vacuum chambers, higher power synchrotron radiation absorbers, and stronger bunch-by-bunch feedback systems. The present injector based on the SLAC linac needs no improvements and is ready for the Super-B-Factory.

A proposal for the surface roughness wake field measurement at the TESLA Test Facility

The wake fields due to the rough surface of the vacuum chamber have a major influence on the beam dynamics in linear colliders and free electron lasers. These wake fields mainly consists of the fundamental tube mode, modified by the rough boundary condition, which decreases its phase velocity to the speed of light. Its wavelength is proportional to the square root of the tube radius and the roughness depth and is comparable to the FEL bunch length, i.e. in the order of 10-30 micron. To study this effect with the beam available at the TESLA Test Facility (TTF) the use of tubes with an artificially increased roughness is suggested. The expected pulse power of these wakes, caused by the 250 micron bunch carrying a charge of 1 nC, can reach up to several MW. In this paper a preliminary design of an installation of a surface roughness wake field experiment at the TESLA Test Facility is presented.