Abstract
This paper describes the measurement of the transverse, two-dimensional profile of the high current proton beam in the linac at the Tsinghua University, by tomography mapping using a rotatable multi-wire scanner. The experiment is conducted at a beam energy of 3 MeV, a peak current of up to 32 mA, a repetition frequency of 20 Hz, and a beam pulse width of $50\text{ }\text{ }\ensuremath{\mu}\mathrm{s}$. The transverse density distribution is reconstructed utilizing the algebraic reconstruction technique (ART), by using the beam profiles measured at different rotation angles. The beam profile, measured at a fixed rotation angle, is obtained by 19 parallel carbon wires mounted on one board of the wire scanner monitor (WSM) moving along a straight line with a step increment of 0.1 mm. The results gathered from the computer tomography (CT) method could be verified by an independent profile measurement downstream of a multiple-slit aperture. This paper presents first measurement results of the high current proton beam during normal operation of the linac at the Tsinghua University. A dynamic range of $1{0}^{2}$ for the two-dimensional distribution was achieved.
Highlights
Wire scanner monitors (WSMs) are widely adopted in accelerator facilities for a minimum-invasive measurement of the transverse beam profile, with applications that include the understanding of the underlying beam dynamics, the determination of the emittance, and the beam halo [1,2,3,4]
This paper describes the measurement of the transverse, two-dimensional profile of the high current proton beam in the linac at the Tsinghua University, by tomography mapping using a rotatable multi-wire scanner
The results gathered from the computer tomography (CT) method could be verified by an independent profile measurement downstream of a multiple-slit aperture
Summary
Wire scanner monitors (WSMs) are widely adopted in accelerator facilities for a minimum-invasive measurement of the transverse beam profile, with applications that include the understanding of the underlying beam dynamics, the determination of the emittance, and the beam halo [1,2,3,4]. The principle of the measurement is to obtain the flux information of the secondary particles scattered off the wires, by scanning the wire through the beam. This flux intensity is proportional to the primary proton beam colliding with the wires [5,6]. A one-dimensional transverse profile, projected perpendicular to the axes of wire motion, as obtained from a conventional wire-scanner can provide sufficient information for a beam with a Gaussian distribution.
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