Abstract
We have developed a cost-effective, fast rotating wire scanner for use in accelerators where high beam currents would otherwise melt even carbon wires. This new design uses a simple planetary gear setup to rotate a carbon wire, fixed at one end, through the beam at speeds in excess of $20\text{ }\text{ }\mathrm{m}/\mathrm{s}$. We present results from bench tests, as well as transverse beam profile measurements taken at Cornell's high-brightness energy recovery linac photoinjector, for beam currents up to 35 mA.
Highlights
Ever increasing requirements for the quality of relativistic particle beams are the main driving force behind progress in diagnostic equipment, with new beam parameters oftentimes requiring novel approaches in beam diagnostics instrumentation
A new regime of beam parameters has become accessible with the advent of very intense photoinjectors, which feature very high average beam currents and low transverse beam emittances (
The beam energy is so low that synchrotron or diffraction radiations, which are often the method of choice for beam profile measurements at higher energies, are generally not available without introducing strong magnetic fields or placing apertures undesirably close to the beam for diffraction radiation
Summary
Ever increasing requirements for the quality of relativistic particle beams are the main driving force behind progress in diagnostic equipment, with new beam parameters oftentimes requiring novel approaches in beam diagnostics instrumentation. Diagnostics tool capable of measuring the size of these intense beams is needed with a resolution on the order of 10 μm Such diagnostics would complement the interceptive low duty factor double-slit or pepper-pot measurements commonly used in photoinjectors to measure the beam's transverse phase space. For a beam current of 100 mA and both an electron beam diameter and a wire diameter of 34 μm, this results in the minimal scanning speed of 20 m=s This limitation comes primarily from the beam energy and the transverse dimension since according to the first-order model the wire temperature rise does not depend on its diameter [6]. Results of bench tests and applications of the new wire scanner prototype in the Cornell energy recovery linac (ERL) photoinjector—operating at beam energy 4 MeV, bunch frequency 1.3 GHz, and currents up to 35 mA—are presented in this paper
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