Beam profile monitors in the NLCTA

Abstract

The transverse current profile in the Next Linear Collider Test Accelerator (NLCTA) electron beam can be monitored at several locations along the beam line by means of profile monitors. These consist of insertable phosphor screens, light collection and transport systems, CID cameras, a frame-grabber, and PC and VAX based image analysis software. In addition to their usefulness in tuning and steering the accelerator, the profile monitors are utilized for emittance measurement. A description of these systems and their performance is presented.

Introduction to Microwave Linear [Accelerators]

“…In addition, beam-jitter on the screen aects the inference of beam-moments. Examples of dierent screen, graticule and camera congurations can be seen in [31,32,33]. Analysis of beam prole data from a screen may be found in [34].…”

NLCTA injector experimental results

“…The energy and energy spread of the beam are measured with the profile monitor in the high dispersion region of the chicane and the emittance of the beam is measured using quad scans and a screen upstream and downstream of the chicane [8]. Bunch to bunch energy and energy spread variations are measured at the end of the machine close to the final dump using a pulsed bend magnet with a ramped current to sweep the bunch train vertically for the duration of the pulse, while a DC bend magnet bends the bunches in the horizontal plane allowing the measurement of the energy spread, from the head to the tail of the train [5].…”