Since the resistive wall impedance for a beam pipe of a nonround cross section depends on the coordinates of a witness particle, the witness particle receives an incoherent tune shift. When the expression for the impedance of an infinitely thick chamber is applied to the calculation of this tune shift, it becomes infinite. We have derived the resistive wall impedance for a chamber with a finite...

A digital receiver based tune measurement system is implemented recently. Novel digital receiver plays a central role for tune measurement. The output of digital receiver is further Fourier analysis by digital signal processor. Design considerations of this tune monitor such as, speed, resolution, dynamic range, control interface will discuss in this report. Comparing with traditional spectrum ...

We are using bandit-based adaptive operator selection while autotuning parallel computer programs. The autotuning, which uses evolutionary algorithm-based stochastic sampling, takes place over an extended duration and occurs in situ as programs execute. The environment or context during tuning is either largely static in one scenario or dynamic in another. We rely upon adaptive operator selecti...