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Energy calibration with trim magnet deflection

05/12/2014 03:47 PM

Photoelectron energy measurements utilizing trim magnet deflection onto a YAG screen

D. Crawford, D. Broemmelsiek, K. Carlson, N. Solyak

8 May 2014

The Advanced Superconducting Test Accelerator (ASTA) is housed in the NML building at Fermilab. The ASTA Front-End is a high brightness, 1.5 cell, copper, 1.3 GHz RF Gun that accelerates photoelectrons with a ~40 MV/m gradient. The Diagnostic Table is a part of the ASTA Front-End and is responsible for directing the ultra-violet (UV) laser to the photocathode and providing instrumentation for studying the electron beam. The energy of the photoelectrons can be determined by varying the current of a trim dipole magnet located downstream of the RF Gun and measuring the deflection on a YAG screen located on the Diagnostic Table....