The cross section of the process $e^+e^-\to\pi^+\pi^-$ has been measured in the center-of-mass energy range from 0.32 to 1.2 GeV with the CMD-3 detector at the electron-positron collider VEPP-2000. The measurement is based on an integrated luminosity of about 88 pb$^{-1}$, of which 62 pb$^{-1}$ represent a complete dataset collected by CMD-3 at center-of-mass energies below 1 GeV. In the dominant region near the $\rho$ resonance a systematic uncertainty of 0.7% was achieved. The implications of the presented results for the evaluation of the hadronic contribution to the anomalous magnetic moment of the muon are discussed.

A cross section of the process e+e−→KS0K±π∓π+π− has been measured for the first time using a data sample of 185.4 pb−1 collected with the CMD-3 detector at the VEPP-2000 e+e− collider. With the KS0→π+π− decay detection, 373±20 and 514±28 signal events have been selected with six and five reconstructed tracks, respectively, in the center-of-mass energy range 1.6–2.0 GeV. The total systematic uncertainty of the cross section is about 15%. A study of the production dynamics allows us to extract a contribution from the e+e−→f1(1285)π+π− intermediate state and to measure the corresponding cross section. The intermediate states with the f1(1420) and f1(1510) resonances have been observed.

The cross section of the process $e^+e^-\to\pi^+\pi^-$ has been measured in the center of mass energy range from 0.32 to 1.2 GeV with the CMD-3 detector at the electron-positron collider VEPP-2000. The measurement is based on a full dataset collected below 1 GeV during three data taking seasons, corresponding to an integrated luminosity of about 62 pb$^{-1}$. In the dominant $\rho$-resonance region, a systematic uncertainty of 0.7% has been reached. At energies around $\phi$-resonance the $\pi^+\pi^-$ production cross section was measured for the first time with high energy resolution. The forward-backward charge asymmetry in the $\pi^+\pi^-$ production has also been measured. It shows the strong deviation from the theoretical prediction based on conventional sQED framework and is in good agreement with GVDM and dispersive-based predictions. The impact of presented results on the evaluation of the hadronic contribution to the anomalous magnetic moment of muon is discussed.

A cross section of the process e+e−→KS0K±π∓π+π− has been measured for the first time using a data sample of 185.4 pb−1 collected with the CMD-3 detector at the VEPP-2000 e+e− collider. With the KS0→π+π− decay detection, 373±20 and 514±28 signal events have been selected with six and five reconstructed tracks, respectively, in the center-of-mass energy range 1.6–2.0 GeV. The total systematic uncertainty of the cross section is about 15%. A study of the production dynamics allows us to extract a contribution from the e+e−→f1(1285)π+π− intermediate state and to measure the corresponding cross section. The intermediate states with the f1(1420) and f1(1510) resonances have been observed.

VEPP-2000 electron-positron collider operating in the beam energy range of 150-1000 MeV is the only machine originally designed for and successfully exploiting Round Beams Concept. After injection chain upgrade including link to the new BINP injection complex VEPP-2000 proceeded with data taking since 2017 with luminosity limited only by beam-beam effects. At the low energies (300-600 MeV/beam) the novel technique of effective emittance controlled increase by weak coherent beam shaking allowed to suppress the limiting flip-flop effect and resulted in additional luminosity gain factor of 4. The averaged delivered luminosity at the omega-meson production energy (2×391 MeV) achieved L =2×1031 cm2s1/IP. At the top energies above nucleonantinucleon production threshold the stable operation with luminosity of L = 5×1031 cm2s1/IP resulted in high average data taking rate of 2 pb1/day in 2020.

The CMD-3 detector started data taking at the electron-positron collider VEPP-2000 in December 2010 with a goal to collect about 1 fb −1 . The collected data sample corresponds to an integrated luminosity of 200 pb −1 in the center-of-mass energy range from 0.32 up to 2 GeV. This paper reports recent results on the hadronic cross sections measurements with the CMD-3 detector.

This paper reports a current status of the measurements of the hadronic cross sections in the c.m. energy range from 0.32 to 2.0 GeV with the CMD-3 detector at the VEPP-2000 electron-positron collider. The overall size of the data, acquired by the CMD-3 in the runs of 2010–2013 and 2017–2018 years, is about 160 pb−1. The results of data analysis for various exclusive modes of e+e−→hadrons are described.

The present status of two operating BINP electron-positron colliders VEPP-2000 and VEPP-4M is given.

The Budker Institute of Nuclear Physics (BINP) project of the VEPP-2000 electron-positron Round Colliding Beams in the energy range 2*(0,25 ÷ 1) GeV has an average synchrotron radiation (SR) power of up to 1,0 kW/m at maximum currents Ie- = Ie+ = 200 mA. An overview of the VEPP-2000 complex vacuum system after the upgrade of injection complex at BINP is described here. This paper presents the dependences of photodesorption yield for aluminum and lifetime versus accumulated dose for future SRF "SKIF" (Siberian Research Facility "SKIF").

Two BINP colliders VEPP-4M and VEPP-2000 e+ecolliders are under operation with the beams feeding from VEPP-5 Injection Complex via newly constructed K-500 beam transfer line. Upgraded injection chain demonstrated ability to provide designed luminosity both to VEPP4M and VEPP-2000 and techniques of reliable operation are under development now. The design and operation experience of Injection Complex and transfer lines are presented. INTRODUCTION Two electron-positron colliders at Budker Institute of Nuclear Physics (Novosibirsk, Russia) are under operation: VEPP-2000 [1, 2, and 3] and VEPP-4M [4]. Both colliders are fed with the electron and positron beams from VEPP-5 Injection Complex [5, 6]. The infrastructure of BINP accelerator facilities are presented in Fig. 1. VEPP-5 Injection Complex and collider facilities are connected with the Beam Transportation Channels (K-500 Channels) [7]. Figure 1: BINP Accelerator Facility layout. INJECTION COMPLEX VEPP-5 VEPP-5 Injection Complex consists of electron gun, 270 MeV driving electron Linac, 510 MeV positron Linac and dumping ring. Damping ring stores and cools down both electron and positron beams for the next extraction to K-500 beam transfer line (see Fig. 2). Repetition rate is decided to be kept under 12.5 Hz due to VEPP-5 operation experience: some subsystems, like injection/extraction system, require more powerful cooling and some radiation aspects should be reconsidered before planned repetition rate increasing. Nevertheless, 1.2·10 of the particles corresponds to 200 mA circulating beam in the Damping Ring – it exceeds VEPP-5 project parameters more than twice [6, 8]. Figure 2: VEPP-5 Injection Complex layout. Table 1: VEPP-5 Beam Production Parameter Value Energy (2016/17 runs) 385 – 420 MeV Electrons storage rate 2·10/s Positrons storage rate 2·10/s Repetition rate up to 12.5 Hz Maximum e extraction: up to 1.2·10 Maximum e extraction: up to 1.2·10 K-500 BEAM TRANSFER LINE The K-500 beam transfer line was turned into operation at BINP in the end of 2015 [7, 8]. This beamline to VEPP2000 facility was designed to the energy of 510 MeV, it has the length of approximately 250 meters to VEPP-2000 side and 120 meters to VEPP-4M side. K-500 and consists of five sections: descent from Damping Ring to K500 tunnel, regular FODO structure in the tunnel both to VEPP-2000 and VEPP-4M, and two lifting to the both collider facilities. The fragment of the transfer line are shown in Fig. 3. ___________________________________________ † d.e.berkaev@inp.nsk.su WEPIK026 Proceedings of IPAC2017, Copenhagen, Denmark ISBN 978-3-95450-182-3 2982 Co py rig ht © 20 17 CC -B Y3. 0 an d by th er es pe ct iv ea ut ho rs 01 Circular and Linear Colliders T12 Beam Injection/Extraction and Transport Figure 3: VEPP-5 – VEPP-2000 beam transfer line (right down corner – view of the beam at the phosphor screen at the end of transfer line). DAMPING RING INJECTION AND EXTRACTION The cycle of injection/extraction in/from Damping Ring consists from several cycles of beam injection and one extraction action. Extraction channels are presented in Fig. 4. They consist from extraction “bridges” and 900 turns: DC powered solid yoke dipole and quadrupole magnets (green and grey correspondingly in Fig. 6), and descending beam line with VEPP-2000/VEPP-4M separation: DC powered dipoles and pulsed quads. Such a mixture of techniques appeared during long (the project started in 1993) and staged construction and commissioning of the VEPP-5 IC. EXTRACTION AND TRANSFER MODES VEPP-5 IC has four modes of operation: electrons and positrons to two directions. Figure 4: Extraction lines from Damping Ring. Thus, one need to configure 12 different switch processes (see Fig. 6). In the simplest cases, only type of particles is changing. For the other cases one need to magnetize ex-traction magnet system using the opposite type of particles first. Nevertheless, the last rule has the exception: for the transfer of the particles to VEPP-4M direction mag-nets 6M1-4 has to be turned off (see Fig. 5a). So it is very important the state before zero current setup. In our case, positron mode to VEPP-2000 was chosen for both transitions from VEPP-2000 to VEPP-4M directions for stable operation. Each single changing of the magnets fields lasts 30 seconds due to parameters of DC power converters and the inductance of their loads. Therefore, the maximum time of mode change is 60 seconds. a) operation with VEPP-4M facility. b) operation with VEPP-2000 facility. Figures 5 a) and 5 b): IC VEPP-5 Operation Modes. All mode switching as a mode saving and restoring are provided with the special designed infrastructure [9] based on CX modular accelerators modular control system [10]. Proceedings of IPAC2017, Copenhagen, Denmark WEPIK026 01 Circular and Linear Colliders T12 Beam Injection/Extraction and Transport ISBN 978-3-95450-182-3 2983 Co py rig ht © 20 17 CC -B Y3. 0 an d by th er es pe ct iv ea ut ho rs Figure 6: IC VEPP-5 extraction matrix of modes. TWO COLLIDERS OPERATION Common cycle based on the current operation experience starts from the positrons to VEPP-4M mode. Ten minutes are enough to fill the facility booster with 60-90 mA of circulating currents (see the Table 2 for BINP accelerator rings parameters comparison). Than VEPP-4M performs own cycle of boosting and injection to the collider. For this time, IC VEPP-5 is switched to VEPP2000 direction and provides the required particles for another collider. Own VEPP-4M cycle lasts about 15 minutes, then, IC VEPP-5 is turned back to VEPP-4M direction but in the electron mode. Than the common cycle repeats. Typical IC VEPP-5 switching modes are presented in Fig. 7. Figure 7: Status page of IC VEPP-5 [11]. Table 2: Comparison of the Number of Particles and Beam Currents for Different BINP Accelerator Rings VEPP5 DR BEP VEPP2000 VEPP3 VEPP4M N/P,m 27.40 22.35 24.18 74.39 366.1 1•109 1.75 2.15 1.99 0.65 0.13 5•109 8.76 10.74 9.93 3.23 0.66 1•1010 17.52 21.48 19.85 6.45 1.31 5•1010 87.59 107.38 99.26 32.26 6.56 1•1011 175.18 214.77 198.51 64.52 13.11 CONCLUSION At the present, Injection Complex VEPP-5 are routinely provide both types of particles to both BINP Colliders with the efficiency up to 80% VEPP-2000 and VEPP-4 colliders are under operation for the experiments according to their scientific programs.

A record low horizontal emittance of 1 nm-rad was successfully obtained in PETRA III third generation synchrotron light source. A key system that allowed reaching such value includes 20 permanent magnet damping wigglers installed in two long straight sections. The wigglers radiate almost 1 MW at maximum current of hard X-ray radiation which issues a challenge for the design of SR absorbers and vacuum system components for the damping wiggler section. The paper describes in detail the design consideration, manufacturing and experimental performance of absorbers and vacuum system. The first experimental results of PETRA Ill damping wiggler section operation are presented. (C) 2011 Elsevier Ltd. All rights reserved.

The irradiation of carbon ion beam cancer is very effective and successful treatment as was demonstrated at NIRS (Chibo) and other laboratories [1]. The scattering ion on the way to irradiation point so huge that initial small momentum spread and emitances cooled ion beam looks luxuries that really not necessary. At this article discussed way cooling can made this facility cheaper and more reliable. At this year started project this facility for the company IREN P.R. China. At report made short introduction acceleration aspects of this project development at BINP (Novosibirsk). INTRODUCTION The first public discussion idea using electron cooling for carbon ion beam cancer therapy facility had place on ECOOL05 workshop [2]. The carbon ions for irradiation should have energy at range 140-430 MeV/u for deep located cancer tumour [3]. If used scanning technique for distribution the ions pellets with radius 1 mm across 3D sphere radius 1 cm the 2*10 of ions should be split on the more then 1000 portions with 2*10 ions at each pellet. For repetition rate of the pellets 100 1/s this procedure irradiation tumour need as minimum 10 sec. So precise manipulation with ion beam can be made after strong collimation final beam or with preliminary cooled ion beam. The collimation produced additional problems with activation the material of the ion beam channel and need increasing initial ion beam intensity. The electron cooling shrink the ion beam after acceleration (when rule of the space charge became small) at very narrow cylinder with radius less 1 mm and momentum spread less 10 that made this manipulation procedure with the beam more easy technically and decreased the useless losses ion beam at many order magnitude. The fig.1 show photo of nuclear emulsion foil after exposition under proton beam cooled at the first cooler EPOHA (BINP). After recombination at cooler H atoms pass about 10 m. Fig.1 Photo nuclear emulsion irradiated the 65 MeV atoms hydrogen generated at NAP-M electron cooler. The second aim of using the electron cooler is help at accumulation the ion beam at injection. The first shoot of the multi turns injection the ion beam occupy usually the main part of the storage ring available acceptance. The electron cooling concentrated the ion beam at small dense core and make main part of the ring acceptance free for repeated new injection. This procedure became standard at the slow cycle synchrotron for increasing the ion beam intensity. Fig.2 show example of this cycle operation at China storage ring CSRm equipped new generation of the electron cooler designed and fabricated at BINP [4]. This carbon ion beam accumulated and cooled on the injection energy 7 MeV/u and then accelerated up to 1 GeV/u. Fig.2 The ion beam current versus time at CSRm cycle with acceleration from 7 MeV/u to 1000 MeV/u. At the first 10 s of the cycle the ion beam accumulated and intensity increase by multi turn injection repeated with half second period. Then start acceleration and the ion current increased by increasing the revolution frequency at the storage ring CSRm. The parameters of CSRm close to parameters need for our project the therapy system. ACCELERATION COMPONENTS The acceleration complex consist from the injection tandem based on the ELV electrostatic accelerator with 1.25 MV high voltage terminal. Then beam came to the booster ring and accelerated up to 30 MeV/u. The carbon beam with repetition rate 10 Hz injected and accumulation with an electron cooling at the main ring. After accumulation 10 injections the ion beam accelerated to required energy 140-430 MeV/u and extracted at the irradiation rooms. INJECTOR The tandem electrostatic accelerator with 1.25 MV at the high voltage terminal is used as the accelerator 01 Accelerator Application To Medicine And Technology Proceedings of RuPAC 2008, Zvenigorod, Russia