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V.Sajaev, V.Lebedev, V.Nagaslaev, A.Valishev (ANL USA)

Determination of precise model of a storage ring using response matrix fit: application to Advanced Photon Source and Tevatron

Response matrix fit has proved itself as a very powerful tool for storage ring model determina- tion and optics measurements. First application of this technique was reported at NSLS and then it was further developed at ALS. For the past several years this method was extensively used at APS for optics correction and development. The software developed at APS was also success- fully employed at Tevatron, where physicists were able to increase luminosity by about 15% based on the newly developed model. In this paper we will describe the technique and show its various applications to the APS storage ring and Tevatron including transverse impedance de- termination at APS.

Dr. Vadim Sajaev: sajaev@aps.anl.gov

G.L.Kotkin, V.G.Serbo (Novosibirsk State University, Novosibirsk, Russia) Beam-size effect and particle losses at colliders

In the modern colliders, the macroscopically large impact parameters give a substantial contribu- t i o n t o t h e s t a n d a r d c r o s s s e c t i o n o f t h e e + e - e + e - p r o c e s s . T h e s e i m p a c t p a r a m e t e r s m much larger than the transverse sizes of the colliding bunches. It means that the standard cross section of this process has to be substantially modified. Such a beam-size effect has been discov- ered in BINP (Novosibirsk) twenty years ago. In this report we give simple qualitative descrip- tion of this effect and present two novel topics. First, we present our calculations related to bremsstrahlung at B-factories KEKB and PEP-II. We find out that this effect reduces beam losses by about 20%. Second, we derive formulas which necessary to take into account quantita- tively the effect of particle correlations in the beams on the spectrum of bremsstrahlung as well as in pair production. This report is based on the papers: G.L. Kotkin and V.G. Serbo, NIM B227 a y b e

(2005) 137 and Phys. Rev. STAB 7 (2004) 101001.

Prof. Valery Georgievich Serbo: serbo@math.nsc.ru

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    F.Bykovsky, A.G.Kobets, Yu.V.Korotaev, V.I.Lohmatov, I.N.Meshkov, R.V.Pivin,

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    Yu.Rudakov, I.A.Seleznev, A.O.Sidorin, A.V.Smirnov, G.V.Trubnikov, S.L.Yakovenko (Joint

Institute Nuclear Research, Dubna, Russia) Development of LEPTA facility.

General goal of the LEPTA (Low Energy Particle Toroidal Accumulator) project, which is under development in JINR now, is to create small positron storage ring equipped with an electron cooling system. Storage ring of LEPTA facility was commissioned in September, 2004. Results of testing the storage ring with electron beam are presented. Positron injector for the ring is based on 22Na radioactive source. Positrons from the source are moderated in the solid neon and stored in electromagnetic trap. First experiments with the solid moderator have been performed. The positron trap is under test now with electron beam. This work is supported by RFBR grant 05-02-16320.

Dr. Grigory Vladimirovich Trubnikov: trubnikov@jinr.ru


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