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FETS Pepperpot

This document outlines the design and calibration procedures of the FETS Pepperpot head developed at Imperial College by Simon Jolly. The system utilizes a tungsten intercepting screen with 50-micron holes for beamlet generation. It incorporates a fast CCD camera to record light spots on a scintillator screen, allowing emittance calculations based on spot distribution. A cooling support block prevents overlapping of beamlets, and additional optical fibers facilitate calibration by producing light spots for precise imaging. The setup is integral to ensuring accurate beam profiling in particle physics applications.

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FETS Pepperpot

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  1. FETS Pepperpot Simon Jolly 10th February 2010

  2. The Pepperpot • Beam segmented by intercepting screen with regular array of holes. • Beamlets drift short distance before producing image on scintillator screen. • Support block prevents beamlets from overlapping and provides cooling. • CCD camera records image of light spots. • Calculate emittance from spot distribution. Scintillator screen Support block Fast CCD Camera Incoming Beam Intercepting screen Beamlets Simon Jolly, Imperial College

  3. FETS Pepperpot Design Beam profile head Tungsten mesh Pepperpot head Shutter Bellows Camera Moving rod Vacuum bellows Mounting flange Simon Jolly, Imperial College

  4. Pepperpot and Slit-Slit Scanners Simon Jolly, Imperial College

  5. Calibration System • Need to produce 4 light spots on scintillator screen for calibration. • Bring in 4 optical fibres through spare holes in copper mounting block. • Fibre stops a little way short of scintillator screen, mounted in centre of 2mm x 13mm glass dowel. • Glass dowel is frosted on scintillator screen end. • Light from fibre produces 1mm spot on frosted end of glass dowel ie. at scintillator screen. • Spots are imaged for calibration. Scintillator screen Fast CCD Camera To light source Copper mounting block Simon Jolly, Imperial College

  6. Pepperpot Head FETS pepperpot uses tungsten intercepting screen with 50 micron holes on 3 mm pitch, 10 mm drift and quartz scintillator. Simon Jolly, Imperial College

  7. Pepperpot Head: Mounting Holes FETS pepperpot uses tungsten intercepting screen with 50 micron holes on 3 mm pitch, 10 mm drift and quartz scintillator. Tungsten screen and copper mounting blocks are aligned with 4 2mm x 13mm metal dowels. Simon Jolly, Imperial College

  8. Pepperpot Head: Calibration Holes Fibres come in from back side of head. FETS pepperpot uses tungsten intercepting screen with 50 micron holes on 3 mm pitch, 10 mm drift and quartz scintillator. 4 spare 2mm dowel holes to be used for fibre optic calibration Tungsten screen and copper mounting blocks are aligned with 4 2mm x 13mm metal dowels. Simon Jolly, Imperial College

  9. Pepperpot Support & Main Flange Cooled feed through rod. The linear shift mechanism (LSML) from UHVDesign mounted to the main flange. KF-40 vacuum flanges used for feedthroughs Adjustable camera mount. Simon Jolly, Imperial College

  10. Pepperpot Mounted to Vacuum Tank KF-40 flange to be used for fibre optic feedthrough. Simon Jolly, Imperial College

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