Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1823570 | Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment | 2012 | 9 Pages |
Abstract
At the Fermilab A0 photoinjector facility, bunch-length measurements of the laser micropulse and the e-beam micropulse have been done in the past with a fast single-sweep module of the Hamamatsu C5680 streak camera with an intrinsic shot-to-shot trigger jitter of 10-20Â ps. We have upgraded the camera system with the synchroscan module tuned to 81.25Â MHz to provide synchronous summing capability with less than 1.5Â ps FWHM trigger jitter and a phase-locked delay box to provide phase stability of â¼1Â ps over 10Â s of minutes. These steps allowed us to measure both the UV laser pulse train at 263Â nm and the e-beam via optical transition radiation (OTR). Due to the low electron beam energies and OTR signals, we typically summed over 50 micropulses with 0.25-1Â nC per micropulse. The phase-locked delay box allowed us to assess chromatic temporal effects and instigated another upgrade to an all-mirror input optics barrel. In addition, we added a slow sweep horizontal deflection plug-in unit to provide dual-sweep capability for the streak camera. We report on a series of measurements made during the commissioning of these upgrades including bunch-length and phase effects using the emittance exchange beamline and simultaneous imaging of a UV drive laser component, OTR, and the 800Â nm diagnostics laser.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Instrumentation
Authors
A.H. Lumpkin, J. Ruan, R. Thurman-Keup,