Sadiq IPAC 2012

Abstract

Emittance of Varian High Rep-Rate Linac (HRRL) was measured with Optical Transition Radiation (OTR) at 14 MeV. Electron beam was observed at 10 [math]\mu m [/math] thick Al screen. Projection of beam appear to be sharper than Gaussian distribution, and super-Gaussian distribution were fitted. Quadrupole scanning method shows that horizontal and vertical are [math]11.4 \pm 0.6~\mu m[/math] and [math] 9.3 \pm 1.8~\mu m[/math] respectively.

Experiment Setup

Experimental setup is shown in the following two figures.

Fig. HRRL beamline

Fig. HRRL beamline

We chose one of the quad at a time to do the scan and turned off all the other quads. Optical transition radiation was observed at OTR target. At the end of 0 degree beamline we have a Faraday cup to measure the charge of the beam. Camera cage system was located below the OTR target. There are 3 lenses used to focus lights from target to the CCD camera. Target can be pushed into or taken out of the beamline by the actuator at the top.

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