Speaker
Description
The Zero Power Tuneable Optics (ZEPTO) project at STFC Daresbury Laboratory has developed several prototype permanent magnet quadrupoles (PMQs) with the largest tuning range so far demonstrated for any PMQ. By moving permanent magnet blocks relative to fixed steel structures that define the flux path,gradient is adjusted whilst homogeneity remains defined by the steel shape. Maintaining stable field homogeneity and magnetic axis position during adjustment remains a challenge that requires extremely high precision in manufacture and assembly to achieve. Based on lessons learned from the latest ZEPTO prototype, which ran for 2 years on Diamond Light Source, we have developed a fourth prototype which will be installed on the CLARA linear accelerator. This has 2 key developments over the previous prototype to overcome difficulties in manufacturing and assembly precision. If measurements show poor magnet harmonics or axis shift as a function of gradient, these are correctable in the new prototype without re-assembling the magnet or re-machining components. We show that by magnetic steel shims in defined patterns we can correct higher order field components, and that by removing rods of material from the yoke in pre-defined patterns we can tune or add field saturation in one half of the magnet to correct magnetic axis movement. This represents the next step into bringing this technology into direct competition with electromagnets in terms of convenience and reliability.
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