Beam Switching and Beam Feedback Systems at Kekb Linac
نویسندگان
چکیده
The KEK 8-GeV electron / 3.5-GeV positron linac has been operated with very different beam specifications for downstream rings, KEKB, PF and PF-AR. For the reliable operation among these beam modes, intelligent beam switching and beam feedback systems have been developed and used since its commissioning. A software panel is used to choose one of four beam modes and a switching sequence is executed in about two minutes. Most items in a sequence are simple operations followed by failure recoveries. The magnet standardization part consumes most of the time. The sequence can be easily re-arranged by accelerator operators. Linac beam modes are switched about fifty times a day using this software. In order to stabilize the linac beam energy and orbits, as well as some accelerator equipment, about thirty software beam feedback loops have been installed. They have been routinely utilized in all beam modes, and have improved its beam quality. Since its software interfaces are standardized, it is easy to add new feedback loops simply defining monitors and actuators.
منابع مشابه
Commissioning Status of the Kekb Linac
After entering into the full-commissioning phase of the KEKB linac in May, 1998, we have established two linac injection modes for the KEKB ring: an 8-GeV electron beam and a 3.5-GeV positron beam, as well as beam modes for the rings of the synchrotron light sources. All modes are easily switched for almost one minute without any trouble. The linac beam characteristics have been substantially i...
متن کاملBeam Feedback Systems and Bpm Read-out System for the Two-bunch Acceleration at Kekb Linac
In order to double the positron injection rate into the KEKB ring, a two-bunch acceleration scheme has been studied at the linac, in which bunches separated by 96 ns are accelerated in 50 Hz. In this scheme the stabilization of energy and orbit of each bunch is indispensable. Thus the beam energy and orbit feedback systems have been upgraded. Since beam characteristics are acquired through beam...
متن کاملPlc-based Beam Charge Interlock System for Radiation Safety in the Kekb Injector Linac
A new PLC-based beam charge interlock system is under development for radiation safety and machine protection in the KEKB injector linac. This system restricts integrated amounts of beam charges passing through several locations along the linac before they are injected into four different storage rings (KEKB ee storage rings, PF, PF-AR). The beam charges are measured using wall current monitors...
متن کاملRecalibration of a Wall-current Monitor Using a Faraday Cup for the Kekb Injector Linac
An absolute beam-charge measurement of single-bunch electron beams with a pulse width of 10 ps and shortpulsed electron beams with a pulse width of 1 ns was performed by the beam test for the KEKB injector linac using a Faraday cup. A wall-current monitor was directly recalibrated by the beam test with an error of ±2%.
متن کاملTowards Reliable Acceleration of High-energy and High-intensity Electron Beams
The KEK electron linac was upgraded to 8 GeV for the KEK B-Factory (KEKB) project. During commissioning of the upgraded linac, even while continuing SOR ring injections, we had achieved a primary electron beam with 10-nC (6:24 10) per bunch up to 3.7-GeV for positron generation. This could be classified as one of the brightest S-band linac’s. Since the KEKB rings were completed in December 1998...
متن کامل