A 25-KeV, 30-milliamp hydrogen-ion injector for A 200-MHz, 750-KeV radiofrequency quadrupole

Donald Swenson, Frank Guy, Joel Starling, Carl Willis, Jim Potter, Joseph Sherman
2007 2007 IEEE Particle Accelerator Conference (PAC)  
An injector development program is being pursued at Linac Systems for satisfying linear accelerator input beam requirements. Proton beams with 25-keV beam energy and 30-mA current with variable duty factors are presently being produced. The two main injector ingredients are a microwave plasma source and a singleeinzel lens for matching the proton beam into the Radio Frequency Quadrupole (RFQ) accelerator. By realistic design simulation, the 25-keV rms normalized emittance is predicted to be
more » ... (πmm-mrad) after extraction from the plasma. The proton beam rms normalized emittance is predicted to grow to 0.24 (πmm-mrad) at the RFQ match point for 26 mA proton current. Insertion of a LEBT beam scraper reduces the predicted proton beam current to 15 mA with 0.085 (πmm-mrad) rms normalized emittance. A proton beam with these characteristics is predicted to have good transmission through the 4-bar, 200-MHz RFQ. Recent injector-RFQ measurements are confirming these design predictions, with 18-mA RFQ output current recently measured.
doi:10.1109/pac.2007.4440915 fatcat:67h3ngemcvdsno4pkbqheme7e4