Abstract
The Fermilab photoinjector produces electron bunches of 1--12 nC charge with an energy of 16--18 MeV. Detailed measurements and optimization of the transverse emittance have been carried out for a number of beam line optics conditions, and at a number of beam line locations. The length of the bunches has also been measured, first for an uncompressed beam (as a function of the charge) and then for a compressed beam of 8 nC charge (as a function of the 9-cell cavity phase). These measurements are presented and compared with the simulation codes HOMDYN and ASTRA.
Highlights
Fermilab, in collaboration with UCLA, INFN Milano, DESY, LAL Orsay, IPN Orsay, CEA Saclay, the University of Rochester, and Cornell University, has developed a rf photoinjector to produce high bunch charge (8 nC) with low normalized transverse emittance ( < 20 mm mrad) in trains up to 600 bunches separated by 1 s
The first was in operation from 1998 to 2002 at the TESLA Test Facility accelerator (TTF) at DESY [1]; this photoinjector was used to drive the TTF free electron laser (TTF-FEL) into saturation [2]
The beamlets passing through the slits are viewed with optical transition radiation (OTR) screens located at a distance d 384, 1122, and 380 mm from the slits, respectively
Summary
In collaboration with UCLA, INFN Milano, DESY, LAL Orsay, IPN Orsay, CEA Saclay, the University of Rochester, and Cornell University, has developed a rf photoinjector to produce high bunch charge (8 nC) with low normalized transverse emittance ( < 20 mm mrad) in trains up to 600 bunches separated by 1 s. The photoinjector is operated in partnership with the Northern Illinois Center for Accelerator and Detector Development. The first was in operation from 1998 to 2002 at the TESLA Test Facility accelerator (TTF) at DESY [1]; this photoinjector was used to drive the TTF free electron laser (TTF-FEL) into saturation [2]. The second photoinjector is installed in the A0 building at Fermilab for photoinjector research and development and to study novel applications of high-brightness, pulsed electron beams. The goal of the studies presented in this paper is to characterize the beam produced by the Fermilab photoinjector
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