Abstract :
High performance TeV energy electron/positron colliders (LC) are the first machines to require online, non-invasive beam size monitors for micron and submicron for beam phase space optimization. Typical beam densities in the LC are well beyond the threshold density for single pulse melting and vaporization of any material, making conventional wire scanners ineffective. Using a finely focused, diffraction limited high power laser, it is possible to devise a sampling profile monitor that, in operation, resembles a wire scanner. Very high resolution laser-based profile monitors have been developed and tested, first at FFTB (SLAG) and later at SLC and ATF. The monitor has broad applicability and we review here the technology, application and status of ongoing research programs.
Keywords :
electron accelerators; linear colliders; measurement by laser beam; particle beam diagnostics; TeV energy electron/positron colliders; beam densities; beam phase space optimization; electron beams; laser-based profile monitor; sampling profile monitor; single pulse melting; threshold density; vaporization; Colliding beam devices; Condition monitoring; Diffraction; Electron beams; Laser beams; Optical materials; Positrons; Power lasers; Sampling methods; Wire;
