An Ultra-High-Speed Detector for Synchrotron Radiation Research

Abstract

Current Evaluation of Performance: • Spatial Resolution: ~100 µm (∼2 channels), probably better • Data readout: 200 µs with buffer memory (in progress) • Linearity: linear up to 1.4 MHz/Channel → 1.1 GHz total • Size: small enough to fit existing spectrometers (Scienta, PHI,…) • Stability and Reliability: working at the ALS BL4 since 06/29/03 • Bakeable up to 100 degree C → UHV compatible Some future experiments: • Minutes → seconds photoelectron diffraction/holography for surfaces & nanostructures, time-resolved valence-band spectroscopy • Time-resolved surface reaction studies: steady-state or pump-probe • Time-resolved magnetization studies, incl. MCD • Other applications: time-resolved near-edge x-ray absorption fine structure • Laser spectroscopy with visible/IR photocathode on MCPs Motivation Many experiments at 3 rd (soon 4 th) generation synchrotron radiation sources only possible with GHz-rate linear detection of electrons or photons, leading to: Publications J.