The Tevatron is a single beam pipe machine which contains both protons and anti-protons for HEP. This poses a challenge for measuring betatron tunes because of the possibility of contamination from the other species. In order to overcome this problem, stripline type structures are usually used because they are directional by construction or for the case of the 21.4 MHz Schottky system, a clever...

If the beam is injected into the ring with an offset a, it undergoes betatron oscillation. After the oscillation decoheres, the beam transverse emittance increases by ∆ε . To avoid this emittance increase one typically uses a feedback (or damper) that takes out the oscillation before it damps down. We show that using echo one can recover a fraction of ∆ε long after the beam oscillation decoheres.

Transverse bunch-by-bunch feedback systems for damping coupled-bunch instabilities in the KEKB rings have been working well since the early stages of the commissioning of the rings. Beam diagnostic systems that are the part of the bunch feedback systems, such as bunch current monitors, betatron-tune measurements systems, and bunch oscillation recorders, have been playing important roles in the ...

Nonparaxial propagation of ultrashort, high-power laser pulses in plasma channels is examined. In the adiabatic limit, pulse energy conservation, nonlinear group velocity, damped betatron oscillations, self-steepening, self-phase modulation, and shock formation are analyzed. In the nonadiabatic limit, the coupling of forward Raman scattering (FRS) and the self-modulation instability (SMI) is an...

X-ray radiation from laser wakefield accelerated (LWFA) electrons provides a collimated broadband femtosecond x-ray source with micron-scale size. However, the photon flux is still inadequate for range of applications. By interaction LWFA relativistic second and third harmonic driving wakefield, we report more than an order magnitude enhancement emitted by undergoing betatron oscillations reson...

Proton accelerators were originally developed for nuclear physics experiments as an alternative to radioactive source or cosmic rays. From the earliest days, the energy of the proton has been the most important design parameter of the accelerator builders. As early proton accelerators one can name the Van de Graaff[2] and Cockcroft-Walton[3] devices. They are electrostatic machines, of which th...