X-Ray Beam Position Monitors An Introduction Wilfried Schildkamp

Outline A.Non-Destructive Monitors A1.X-UV Photo-Electron Monitors A2.Fringe Field Fluorescence Monitors A3.Split-Ion-Chambers B.Destructive Monitors B1.Fluorescence Monitors B2.Wire Monitors B3.Reed Monitors

A1.X-UV Photo-Electron Monitors Large Beam Applications for Wigglers and Bending Magnets Jon Tischler’s Geometry for the protection of the CHESS acoustic delay line Linear range and sensitivity

Acoustic Delay Line with Photo-Electron Monitors Linear Range: about 2.5 mm, looking at the vertical low-energy fringe field from a 1.4 T wiggler

Principle of the CHESS Photo-Electron Monitor

Actual Design of the Photo-Electron Monitor

A2.Fringe Field Fluorescence Monitors Mechanical Design of two generations Achievable Accuracies Fast Read-Out Electronics APS Front-End Monitors for Undulators

Mechanical Layout of two fringe field monitors

XBPM Signal Processing

A3.Split-Ion-Chambers 1.Small Beams 1.1Mechanical Design with parallel field 1.2Linear Range 1.3Accuracy and Speed 1.4Analog Divider Readout Electronics 1.5Fill Gas Considerations

Mechanical Design

Linear Range of the Monitor

Speed of the Monitor

A3.Split-Ion-Chambers 2.Fringe Field Measurements from large or multiple Beams 2.1Geometry for CHESS A-Line 2.2Geometry for CHESS F-Line

CHESS A-Line Double Beam Monitor Radiation from Wiggler on the left, Bending Magnet Radiation on the right

Collector Plate Geometries Examples for a clean scattering environment and scatter from one side

A3.Split-Ion-Chambers 3.Solid State Ion Chambers for monochromatic applications 3.1Geometry of CVD Diamond disc monitors 3.2Linear Dynamic Range 3.3Philosophy of Zero-Instrument

Diamond Solid State Ion Chamber Geometry of a small beam on four electrodes

B.Destructive Monitors B1.Fluorescence Monitors B2.Scanning Wire Monitors B3.Reed Monitors

Example of a destructive monitor