TY - GEN
T1 - The spallation neutron source accumulator ring RF system
AU - Hardek, T.
AU - Piller, M.
AU - Champion, M.
AU - Crofford, M.
AU - Ma, H.
AU - Zaltsman, A.
AU - Smith, K.
PY - 2007
Y1 - 2007
N2 - The Spallation Neutron Source (SNS) accumulator ring is a fixed-frequency proton storage ring located at the output of the SNS Linear Accelerator (Linac). Its purpose is to redistribute the 1 millisecond long H- beam pulses from the SNS Linac into high-intensity 695 nanosecond long pulses of protons for delivery to the neutron target. The RF bunching system controls longitudinal beam distribution during the accumulation process and maintains a 250+ nanosecond gap required for beam extraction. The RF system consists of three stations which operate at the beam revolution frequency of 1.05 MHz and a fourth station providing a second harmonic component at 2.1 MHz. The beam pulse at extraction consists of 1.6e14 protons representing a peak beam current of 52 amperes. The system utilizes four 600 kW tetrodes to provide the RF current necessary to produce the 40 kV peak fundamental frequency bunching voltage and to control phase and amplitude at high beam current. A 20 kV peak second harmonic voltage is intended to control longitudinal beam distribution to control the peak circulating current. In this paper we review the design concepts incorporated into this heavily beam-loaded RF system and discuss its commissioning status.
AB - The Spallation Neutron Source (SNS) accumulator ring is a fixed-frequency proton storage ring located at the output of the SNS Linear Accelerator (Linac). Its purpose is to redistribute the 1 millisecond long H- beam pulses from the SNS Linac into high-intensity 695 nanosecond long pulses of protons for delivery to the neutron target. The RF bunching system controls longitudinal beam distribution during the accumulation process and maintains a 250+ nanosecond gap required for beam extraction. The RF system consists of three stations which operate at the beam revolution frequency of 1.05 MHz and a fourth station providing a second harmonic component at 2.1 MHz. The beam pulse at extraction consists of 1.6e14 protons representing a peak beam current of 52 amperes. The system utilizes four 600 kW tetrodes to provide the RF current necessary to produce the 40 kV peak fundamental frequency bunching voltage and to control phase and amplitude at high beam current. A 20 kV peak second harmonic voltage is intended to control longitudinal beam distribution to control the peak circulating current. In this paper we review the design concepts incorporated into this heavily beam-loaded RF system and discuss its commissioning status.
UR - http://www.scopus.com/inward/record.url?scp=51349111465&partnerID=8YFLogxK
U2 - 10.1109/PAC.2007.4439909
DO - 10.1109/PAC.2007.4439909
M3 - Conference contribution
AN - SCOPUS:51349111465
SN - 1424409179
SN - 9781424409174
T3 - Proceedings of the IEEE Particle Accelerator Conference
SP - 3795
EP - 3797
BT - Proceedings of the IEEE Particle Accelerator Conference, PAC07
T2 - IEEE Particle Accelerator Conference, PAC07
Y2 - 25 June 2007 through 29 June 2007
ER -