Simultaneous ion beam profile scan using a single laser source

Abstract

We report on the world's first experiment of a simultaneous profile scan of the hydrogen ion (H À ) beam using a laser wire system. The system was developed and brought to operational level of application at the superconducting linac of the Spallation Neutron Source accelerator complex. The laser wire profile scanner is based on a photodetachment process and therefore can be conducted on a 1-MW neutron production H À beam in a nonintrusive manner. The new simultaneous profile scanning system allows one to simultaneously measure profiles of the H À beam at nine different locations of the linac with high speed and accuracy, and therefore provides a unique tool for accelerator tuning and physics study. This paper describes the design, optical system and software platform developments, and measurement results of the simultaneous profile scanning system.

Laser and optical transport line for laser-based ion beam diagnostics and control in the SNS linear accelerator

“…The first example is the measurement of the beam profiles by using a focused pico-second pulsed laser beam. The measurement principle can be found in [1]. Fig.…”

“…At the Spallation Neutron Source (SNS), a laser wire system has been used to measure the transverse profiles of the neutron production hydrogen ion (H -) beam along its acceleration path [1]. In this talk, we will describe our recent upgrade of the laser wire system on both light source and optical transport line.…”

Gridded duo‐lateral position sensitivity detector with high linearity to low energetic electrons in vacuum environment

“…This is in light of the fact that many studies on systems of beam position monitoring (especially in vacuum chambers) involve expensive setups and apparatus [7][8][9][10][11]. Most available setups for the measurement of the linearity of PSDs are centered on using brackets, actuators, two-dimensional (2D) adjusters and visible light/lasers (as the light source) [12][13][14][15][16].…”

“…The main motivation for this work was to explore a simple and alternative method of beam position monitoring technique as well as using the method to characterise the position detection characteristic of a fabricated position sensitive detector in ultrahigh vacuum environment. This is in light of the fact that many studies on systems of beam position monitoring (especially in vacuum chambers) involve expensive setups and apparatus [7–11]. Most available setups for the measurement of the linearity of PSDs are centered on using brackets, actuators, two‐dimensional (2D) adjusters and visible light/lasers (as the light source) [12–16].…”