PROCEEDINGS OF THE RUSSIAN HIGHER SCHOOL
ACADEMY OF SCIENCES

Abstract
Injection complex for producing highly intensive electron and positron beams is now under construction in Budker institute of nuclear physics (BINP). The beams are planned to be used in high energy physics experiments in VEPP-4 and VEPP-2000 storage rings at BINP. The Preinjector of the Injection complex consists of 300 MeV and 510 MeV linear accelerators.The Preinjector beam position measurement system consists of 14 stripline Beam Position Monitors (BPMs) and electronics. The system is supposed to measure the position of separate electron and positron bunches with an accuracy of 20…30 microns. The main problem is to achieve the required parameters for a positron beam due to the low number of particles per bunch – (2–3)·10⁸. The beam positioning measurement system developed at BINP satisfies all accelerator requirements. The system operation is based on the method of simultaneous measurement of four BPM electrodes signals including signal low-pass filtering and measurement of its amplitude by means of sample-and-hold amplifiers or ADC. The characteristic feature of the new system is a very low ADC clock jitter – less than 13 ps. It allows working with very short signals with a duration of ~3 ns but with the large amplitude. It substantially increases a signal-to-noise ratio and allows achieving the accuracy required both for electrons and for positrons. The system can measure the position of separate bunches with 10⁸…10¹⁰ particles per bunch. The resolution of the measurements for a single bunch is better than 3 μm for 10¹⁰ particles per bunch. The features of BPM electronics design, the main parameters and the results obtained in the Preinjector are presented.

References

1. Akimov A.V., Antonov A.Yu., Antoshin A.V., Bak P.A., Barnyakov A.M., Blinov M.F., Boimelshtein Yu.M., Bolkhovityanov D.Yu., Emanov F.A., Frolov A.R., Galimov R.Kh., Gurov S.M., Gusev E.A., Dikansky N.S., Khambikov V.D., Klyuschev S.N., Konstantinov Ye.S., Kot N.Kh., Kokoulin V.I., Korepanov A.A., Kuskov R.E., Lapik R.M., Lebedev N.N., Logachev P.V., Martyshkin P.V., Pavlov V.M., Petrenko A.V., Pivovarov I.L., Pirogov O.V., Samoilov S.L., Rybitskaya T.V., Semenov Yu.I., Skarbo B.A., Starostenko A.A., Shiyankov S.V., Tsyganov A.S., Yaskina T.A. Status of VEPP-5 injection complex. RuPAC’06, Novosibirsk, Russia, MOAO10, pp. 19–21.
2. Bekhtenev E.A., Dementev E.N., Gurov S.M., Karpov G.V., Logachev P.V., Medvedko A.S. Beam position measurement system of the VEPP-5 preinjector. RuPAC’06, Novosibirsk, Russia, MODP21, pр. 250–252.
3. Medvedko E., Aiello R., Smith S. A two bunch beam position monitor. PAC’97, Vancouver, Canada, pp. 2113-2115.
4. Palmer M.A., Billing M.G., Meller R.E., Rendina M.C., Rider N.T., Rubin D.L., Shanks J., Strohman C.R. CESR beam position monitor system upgrade for CesrTA and CHESS operations. IPAC’10, Kyoto, Japan, MOPE089, pp. 1191–1193.
5. Кarpov G.V., Styuf A.S. New beam position monitor electronics for VEPP-5 preinjector. RuPAC2012, Saint- Petersburg, Russia WEPPD030, pp. 614–615.