FLASH X-RAY (FXR) LINEAR INDUCTION ACCELERATOR (LIA) OPTIMIZATION Upgrade of the OTR Emittance Diagnostic

Houck, T L ; Wargo, P E

Lawrence Livermore National Laboratory

关键词: Bremsstrahlung;    Magnetic Fields;    43 Particle Accelerators;    Transport;    Electron Beams;   

DOI  :  10.2172/900448
RP-ID  :  UCRL-TR-226954
RP-ID  :  W-7405-ENG-48
RP-ID  :  900448

美国|英语

来源: UNT Digital Library

【 摘 要 】

Knowing the electron beam parameters at the exit of an accelerator is critical for several reasons. Foremost is to optimize the application of the beam, which is flash radiography in the case of the FXR accelerator. The beam parameters not only determine the theoretical dose, x-ray spectrum, and radiograph resolution (spot size), they are required to calculate the final transport magnetic fields that focus the beam on the bremsstrahlung converter to achieve the theoretical limits. Equally important is the comparison of beam parameters to the design specifications. This comparison indicates the ''health'' of the accelerator, warning the operator when systems are deteriorating or failing. For an accelerator of the size and complexity of FXR, a large suite of diagnostics is normally employed to measure and/or infer beam parameters. These diagnostics are distributed throughout the accelerator and can require a large number of ''shots'' (measurements) to calculate a specific beam parameter. The OTR Emittance Diagnostic, however, has the potential to measure all but one of the beam parameters simultaneous at a specific location. Using measurements from a scan of a few shots, this final parameter can also be determined. Since first deployment, the OTR Emittance Diagnostic has been limited to measuring only one of the seven desired parameters, the beam's divergence. This report describes recent upgrades to the diagnostic that permit full realization of its potential.