A 25-KeV, 30-milliamp hydrogen-ion injector for A 200-MHz, 750-KeV radiofrequency quadrupole
- Resource Type
- Conference
- Authors
- Swenson, Donald; Guy, Frank; Starling, Joel; Willis, Carl; Potter, Jim; Sherman, Joseph
- Source
- 2007 IEEE Particle Accelerator Conference (PAC) Particle Accelerator Conference, 2007. PAC. IEEE. :1838-1840 Jun, 2007
- Subject
- Fields, Waves and Electromagnetics
Engineered Materials, Dielectrics and Plasmas
Nuclear Engineering
Robotics and Control Systems
Radio frequency
Particle beams
Plasma sources
Plasma accelerators
Plasma simulation
Current measurement
Linear particle accelerator
Linear accelerators
Particle beam injection
Lenses
- Language
- ISSN
- 1944-4680
2152-9582
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 0.07 (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.