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| TUCHB02 | Project of the Nuclotron-based Ion Collider fAcility (NICA) at JINR | ion, collider, heavy-ion, booster | 14 | |||||
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The Nuclotron-based Ion Collider fAcility (NICA) is the new accelerator complex being constructed at JINR aimed to provide collider experiments with heavy ions up to uranium at the center of mass energy from 4 to 11 GeV/u. It includes 6 Mev/u linac, 600 MeV/u booster, upgraded SC synchrotron Nuclotron and collider consisting of two SC rings, which provide average luminosity of the level of 1027cm-2s-1.
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| TUCHB03 | Optics Design for NICA Collider | collider, optics, lattice, emittance | 17 | |||||
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The Nuclotron-based Ion Collider fAcility (NICA) is a new accelerator complex being constructed at JINR collider experiments with ions at maximum energy (center of mass) SNN(1/2) ~ 11GeV/u. Collider ring has to provide ion-ion and ion-proton collisions in energy range 1-4.5 GeV/u and collisions of polarized proton-proton and deuteron-deuteron beams. Collider conceptions with constant gammatr and with possibility of its variation are considered. In the ring with changeable gammatr the optics design should allow to work with gammatr ~40 for protons mode as well as with γtr in range 3-11 for ions mode. The NICA has the racetrack shape (circumference ~450m) with two arcs and two straight sections which optimized to have betta*~35cm in two IPs. Duality of optics adjustable for different energy and different particles puts the special requirements on the arc and straight sections. Suppressing of rather high normalized chromaticity with changeable tune compels us to use the multi-family sextupole scheme. Three variants of the ring optics (based on FODO-cells, ODFDO-cells) were tested to provide acceptable IBS-time. Final version of the lattice is under discussion.
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| TUCHY01 | Muon Collider Design Status | emittance, collider, acceleration, target | 20 | |||||
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Muon Collider (MC) - proposed by G. I. Budker and A. N. Skrinsky almost half a century ago - is now considered as the most exciting option for the energy frontier machine in the post-LHC era. A national Muon Accelerator Program (MAP) is being formed in the USA with the ultimate goal of building a MC at the Fermilab site with c.o.m. energy in the range 1.5-3 TeV and luminosity of ~1-5*1034 cm-2s-1. As the first step on the way to MC it envisages construction of a Neutrino Factory (NF) for high-precision neutrino experiments. The baseline scheme of the NF-MC complex is presented and possible options for its main components are discussed.
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| TUCHZ01 | Accelerator Complex U70 of IHEP: Present Status and Recent Upgrades | extraction, feedback, synchrotron, ion | 27 | |||||
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The report* overviews status of the U70, accelerator complex of IHEP-Protvino comprising four machines (2 linear accelerators and 2 synchrotrons). Particular emphasis is put on the recent upgrades implemented since the previous conference RuPAC-2008.
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* On behalf of the U70 staff |
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| TUCHZ02 | Maintenance of ITEP-TWAC Facility Operation and Machine Capabilities Development | ion, acceleration, laser, injection | 32 | |||||
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Funding: This work is supported by ROSATOM |
The ITEP-TWAC facility operation with proton and heavy ion beams for ~4000 hours per year in several modes of beam acceleration and accumulation is determined by present-day demands of different beam users in the frame of current machine resources. Displacement of state interests from fundamental research to strictly-practical tasks stimulates multimode operation of accelerators with trend of beam using for applications. Mastering of Ag19+ ions acceleration in the UK ring up to the energy of 100 MeV/u and Fe26+ beam stacking in the U-10 ring at the energy of >200 MeV/u in addition to routine operation with C6+ beam at energy of 200-400 MeV/u with fast and slow extraction of circulating beam clear the way to beam using for a lot of applications requiring extension of the facility experimental area. Development of laser ion source technology takes aim at high current and high charge state ions generation for elements with A ~60 to be effectively stacked in the U-10 ring with multiple charge exchange injection technique. The machine maintenance efforts and current activities aiming at both subsequent improvement of beam parameters and extending of beam applications are presented |
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| TUPSA001 | Compensation of Nonlinearities in NICA Collider Optics | sextupole, collider, lattice, dynamic-aperture | 35 | |||||
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Intra-beam scattering is the limiting factor of the luminosity lifetime for Nuclotron-based Ion Collider fAcility (NICA). To minimize IBS growth the dispersion should be lowered as much as possible. Due to this fact and rather long dispersionless straight sections with two IPs the normalized chromaticity reaches a high value ~4. Therefore the strong chromatic sextupoles magnets on arcs are required which in turn bring significant non-linear distortions in beam dynamics. Different schemes involving several families of sextupoles and are tested. Optimization of the chromaticity correction scheme was carried out to increase the dynamic aperture. Use of octupole correctors was studied to compensate the nonlinearities from sextupole magnets and minimize the non-linear tune shift in region of beam. Obtained design of the NICA collider lattice was used for the long term tracking to understand the beam transverse parameters behavior.
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| TUPSA003 | Study of Efficiency of Beam Collimation at U-70 Accelerator by Use of Crystal Targets | collimation, kicker, target, extraction | 38 | |||||
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New crystal technique bent crystal array and veer type reflector based on straight crystals were used like first stage in collimation system at U-70 accelerator. Efficiency of collimation was enhanced up to 90% in two-stage collimation system which included first crystal stage and long steel absorber like second stage. While in previous one-stage system without crystal only 40% protons hit deeply in absorber. For data taking and analysis of information modified modern beam diagnostic system was applied.
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| TUPSA012 | TBA Scheme with Ion/Proton Driving Beam | ion, electron, synchrotron, positron | 62 | |||||
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We are considering a Two Beam Accelerator scheme for electron-positron collisions with Ion/Proton driving beam. We compare the proposed scheme and the CLIC one coming to conclusion, that Ion/Proton driving TBA scheme looks more attractive. Existences of big proton accelerators in few laboratories give a new boost to reconsider the baseline for post LHC era. These labs are FERMILAB, BNL, CERN and IHEP at Protvino, Moscow region. Protvino could emerge as one advantageous place for resurrection of proton synchrotron in existing ~20-km long tunnel. This synchrotron was planned as a booster for 2x2 TeV UNK complex.
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* K. Hubner, CERN/PS 92-43(DI), CLIC Note No.176,1992. |
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| TUPSA013 | The CDS Parameters for Proton Linac with Moderate Heat Loading | linac, coupling, septum, electron | 65 | |||||
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The Cut Disk Structure (CDS) was originally proposed for high energy linac in L-band or S-band frequency range. CDS combines simultaneously high coupling coefficient, high shunt impedance and small transverse dimensions. For lower particle velocity the structure loses in shunt impedance due to relatively thick partition with internal cooling channels. For moderate heat loading internal cooling is not necessary and partition thickness is limited only by mechanical rigidity. The structure equalizes in shunt impedance with another bi-periodical structures and another CDS advantages come in front. Calculated CDS parameters for proton linac are presented.
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| TUPSA015 | Injector Complex of the NICA Facility | ion, rfq, linac, electron | 71 | |||||
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The injection complex of the NICA facility consists of existing Alvarez-type linac LU-20, new heavy ion linac HILac, polarized and heavy ion sources. The LU-20 is under modernization now, the HILac will be constructed during coming years. Parameters of the accelerators are presented.
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| TUPSA027 | The Compact Faraday Cup for Radiobiological Researches in IHEP Accelerators Beams | vacuum, ion, acceleration, electron | 95 | |||||
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IHEPs experts are currently working on the creation of a medical irradiation centre with beams of protons and carbon ions on the basis of an accelerating complex. Already existing accelerators I-100 - U-1,5 - U-70 are forming a complete chain capable of accelerating not only protons, but also, due to certain modifications, light deuteron and carbon nucleus. The compact autonomic Faraday cup which works in the atmospheric environment has been developed to measure currents in the accelerators beams. The device has a good electromagnetic protection. It is compact and allows to make measurements on any (from 600 mm long) open site of a beam line. Vacuum tests and work with biological samples on a beam of protons of I-100 accelerator have proved that the Faraday cup is meeting all the requirements.
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| TUPSA031 | Profiles and Intensities Measurments in the Diagnostic System of the Extracted Beams of the U-70 Accselerator | diagnostics, controls, optics | 107 | |||||
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Diagnostic system for the extracted beams of the U-70 accelerator is a hardware-software complex with profilometers and electronic crates at the lower level, VME-crates with ADC-modules and MVME-167 processors (vxWorks operating system, basic EPICS tools, home made software) at the middle level, personal computers used as workstation at the upper level. In this report we consider: - the approaches to the system adaptation problems during the U-70 runs and solutions to these problems; - data acquisition and hardware-sofware levels of data processing for non-standard profilometers; - the tools for the beam intensity measurement and presentation, the intensimeter calibration procedure.
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| TUPSA034 | Distortions of Proton Beam 2-D Images and Profiles due to Beam Space Charge | ion, simulation, space-charge, linac | 116 | |||||
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The special residual gas ion transverse section monitor is used at Proton LINAC INR RAS output to provide measurements of beam parameters. There are distortions and errors of measurements which are caused by various external and internal factors during the formation of beam transverse section images. Below estimations of these distortions and results of numerical simulation of registration process of images are resulted, resolution of the detector and accuracy of measurements which are spent with it are discussed.
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| WECHA02 | Acceleration of Deuterons up to 23.6 GeV per Nucleon through I100, U1.5, and U70 of IHEP | light-ion, acceleration, ion, synchrotron | 130 | |||||
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The paper* reports on the recent progress en route of implementing the program of accelerating light ions in the Accelerator Complex U70 of IHEP-Protvino. The crucial milestone of guiding the deuteron beam through entire cascade of three accelerators available to a specific kinetic energy of 23.6 GeV per nucleon was accomplished in April 2010, which confirms feasibility of the project goal to diversify our main proton machine U70 to a light-ion synchrotron as well.
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* On behalf of the U70 staff |
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| WECHZ03 | Development of Electron Cooler Components for COSY | electron, secondary-beams, gun, vacuum | 151 | |||||
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Design, production and experiments with prototype of the 2 MV COSY electron cooler commponents reported. The system for transfer 40 kW power along acceleration tube described.
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| WECHZ04 | Results of Electron Cooling Beam Studies at COSY | electron, injection, gun, emittance | 156 | |||||
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Beam studies dedicated to electron cooling and related problems were carried out at COSY in April 2010. The newly installed Ionization Profile Monitor was used to study the dynamics of longitudinal and transverse electron cooling. Friction force measurements were performed. Beam lifetime was measured for different injection parameters, electron currents and working points. Position and angle scans of the electron beam were also performed. Results of the recent beam studies are reported and the plans for future studies are discussed.
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| WEPSB013 | Reconstruction of the Beam Parameters and Structure Characteristics for INR Isotope Channel | linac, target, emittance, quadrupole | 196 | |||||
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The various treatments of profile measurements have been applied to estimate both the major beam parameters and structure functions for the INR isotope channel. The main problem for beam dynamics reconstruction consists in the presence of the dispersion function along the beam line studied. The reliable results were obtained and used to form the beam on the target of INR isotope complex.
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| WEPSB039 | Upgrade of the U-70 Proton Synchrotron Extracted Beam Lines Control System: Multiple Access and Data Presentation | controls, synchrotron, feedback, quadrupole | 260 | |||||
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Equipment under control consists of about 130 Magnet dipoles and quadrupoles, with power provided by 112 power supplies (PS). Each PS is controlled by an individual AD based controller; since a number of used magnets is not stable and exceeds the number of available PSs, commutation is used. Controllers are connected to a front-end computer by means of four CAN field buses. The software for these controllers is tuned to a specific type of the PS and a specific inductive load of the magnet. The server Dell PowerEdge T710 is used for PS control with multiply access from several client workstations which controls PSs for particular Beam Line. All client workstations along with server and front-end computer are connected together using a dedicated LAN. The server grants different users a different permissions to control their "own" PSs only. All measured data are stored into an archive, the archiving step is about 4 seconds. The operating commands are stored into the archive too, this feature gives a helpful possibility to reveal all users actions in case of measurement misunderstanding. The software is based on NI Developer Suit Core and MS Office Web Components packages.
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| THPSC002 | Feasibility of Alternating-Phase Focusing for a Chain of Short Independently-Phased Resonators | linac, focusing, ion, acceleration | 322 | |||||
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Alternating-phase focusing (APF) is usually realized in a long drift-tube structure with multiple acceleration gaps. The synchronous phase alternates periodically gap-by-gap according to either sinusoidal or square-wave laws. The period of synchronous phase oscillations depends on charge-to-mass ratio of accelerated ions and increases with beam energy. One period may include up to 10-20 accelerating gaps. In the case of square-wave law, the sets of 5-10 neighboring gaps have the same synchronous phase, while whole structure consists of continuous chain such gap-sets with a constant value of synchronous phases. Therefore, every such gap-set can be formed into a separate resonator. As result a long multiple gap structure is converted into a chain of short independently-phased resonators. Such realization of APF linac allows more flexibility in a phase variation, while additional focusing-matching lenses can be set up in betweens of resonators. In this report possible parameters of such linac are evaluated and discussed.
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| THPSC003 | Development of Wire-Meshed Electrostatic Lenses for Proton Linac | focusing, linac, rfq, ion | 325 | |||||
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The 2-MeV 150-MHz proton RFQ linac is set up at the Radiation-Acceleration Center (RAC) of Moscow-Engineering Physics Institute (MEPhI). Its output beam-line contains doublet of the electrostatic focusing lenses with a novel design featured by the two-dimensional electric field and wire-meshed beam apertures. Every lens provides a transverse focusing effect only in one plane, while does not affect on the beam in a perpendicular plane. In this report, the analytical and numerical analysis of this lens is presented. The optics of output beam-line including these lenses is evaluated with TRACE-3D code. The experimental construction of the lens doublet is presented.
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| THPSC016 | The Detection of the Leaks Location in the Vacuum Chamber According to Sputter-Ion Pumps Current Measurements | vacuum, site, synchrotron, scattering | 355 | |||||
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Our work presents the analysis of methodology detecting the leaks locations in the vacuum chamber of the proton synchrotron U-70. We present the results of solutions of differential equations for the pressure of the air components allowing to determine the leak location. The pressure is calculated by the measurements of the sputter-ion pumps discharge current.
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| THPSC018 | Power Source for High Voltage Column of Injector to Proton Synchrotron with Output Power up to 5kW | controls, synchrotron, resonance, electron | 360 | |||||
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The presented report contains the description of power source with 400Hz output voltage of sinusoidal shape with amplitude up to 300V and output power up to 5kW, operating on the primary coil of high voltage transformer of precision 1.5MV high voltage source for proton synchrotron injector. The source consists of the converter with IGBT switches , working with a principle of pulse-width modulation on programmed from 15 to 25 kHz frequency, modulated with amplitude and frequency regulated sinusoidal 400Hz signal, transformer and the synchronous rectifier with IGBT switches, controlled synchronous with converter. The efficiency of system is more than 80% at the nominal output power 5kW. The controller of the source is developed with DSP and PLM, which allows optimizing operations of the source. For control of the source serial CAN-interface is used. The description of the source and the test results are presented.
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| THPSC024 | Beam Absorber for Turning Accelerator in the Beam Layout of the Experimental Complex | vacuum, radiation, shielding, photon | 372 | |||||
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The absorber of a beam without moving parts in vacuum volume for adjustment the high current lenear accelerator is described.
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| THPSC025 | Low Level RF Control of ITEP-TWAC Facility | controls, booster, ion, synchrotron | 374 | |||||
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Digital LLRF control system was developed to improve the RF system mobility in multimode operation of the ITEP-TWAC booster and main synchrotrons. High precision mapping of the magnetic field derivative signal to the reference function of accelerating frequency f(B) allows to accelerate ions of any type in both rings up to relativistic energies even without feedback loops. The first modification of the LLRF control module is based on a fixed point DSP, which operates with the frequency lookup table to calculate the accelerating frequency. This module is now used in the booster synchrotron. Upgraded module has a floating point DSP, which allows calculation of the accelerating frequency "on the fly". This module is in operation in the main ring. Short description of the systems is given. Some results and experience obtained at operation with the number of types of particles, such as protons and ions of carbon, aluminum, iron and silver, are presented.
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| THPSC027 | Dubna Project of Cyclotron C250 for Proton Therapy Application | cyclotron, extraction, simulation, ion | 379 | |||||
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Abstract Project of C250 cyclotron for proton therapy is consider. Energy of the extracted from cyclotron beam was increased according to medical requirements up to 250 MeV. 4-fold and compact types of magnet yoke were studied by 3D computer magnetic field calculations. The ability of optimal combination of the magnet yoke, new form of HF systems of the cyclotron based on the dynamics of the proton beam in calculated magnetic and accelerating field is under discussion. Dubna scientific medicine center is under development since 1967 on the base of the proton beam of LNP JINR Phazotron. Proton beam with energy Ер~170 MeV and intensity I~0.1 mkA is used for patients irradiation. Proposal of the cyclotron with the same beam characteristics was reported earlier at the RUPAC04 ICAA05, RUPAC06, RUPAC08and printed in magazine. In this paper the new form of HF system, which with the help of 3d computing program made is consider.
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| THPSC035 | Compromise Systems for Transport Proton and Ion Beams in Medical Aims | ion, target, quadrupole, beam-transport | 390 | |||||
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Traditional GANTRY is not suitable for future centers of therapy by proton or ion beams by reasons of its enormous size, rotation with precision of significant mass, huge electricity consumption and extremely high cost. Review of various compromise solutions for beam transport to a patient is presented in the report: horizontal beam, rotation of patient around the vertical axis, beams with fixated directions, beams with fixated directions and with additional patient rotation around the horizontal axis (with the use of tomography and with additional adjustment after each rotation) and planar systems in different versions. It was shown that planar systems are the most promising solution at the present moment.
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| THPSC037 | Compact Superconducting Synchrocyclotrons at Magnetic Field Level of up to 10 T for Proton and Carbon Therapy | cyclotron, synchro-cyclotron, ion, focusing | 393 | |||||
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Based on brief analysis of accelerators widely used for proton-ion therapy and patient cure during last 20 years the feasibility and importance of compact superconducting synchrocyclotrons operating at magnetic field level up to 10 T is outlined. The main component of modern commercial facility for proton-ion therapy is an isochronous cyclotron with room temperature or superconducting coils accelerating protons up to 250 MeV as well as synchrotron accelerating carbon ions up to 400 MeV/A. Usually ions are delivered from accelerator into the treatment room by transport lines. Irradiation is done by system of pointed to the patient magnets, collimators, energy degraders which are attached to the rotating Gantry. To greatly reduce price of facility (almost in one order of magnitude) and to simplify operational conditions of hospital personal it is proposed to provide iso-centric rotation of compact superconducting synchrocyclotron around the patient. Main physical and technical parameters are described in the paper.
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| THPSC038 | Tuning of the INR Therapeutic Proton Beam | scattering, vacuum, quadrupole, focusing | 396 | |||||
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The scheme of formation of a therapeutic proton beam of the INR RAS Experimental Complex is described. Parameters of a beam and results of measurement of the absorbed doses by the analyser Wellhofer WP600 are presented.
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| FRCHA01 | Development of Accelerators and Detector Systems for Radiacian Medicine in DLNP JINR | cyclotron, extraction, ion, septum | 402 | |||||
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The DLNP JINR activity is aimed at developing two directions in radiation medicine: development of accelerator technique for proton and carbon treatment of tumors and new types of detector systems for spectrometric computed tomography (CT) and combined magnetic resonance tomography (MRT)/positron emission tomography (PET). JINR-IBA realized the development and construction of proton medical cyclotron C235-V3. At present time all basic cyclotron systems were constructed. During 2010 we plan to assemble this cyclotron in JINR and in 2011 perform tests with extracted proton beam. A superconducting isochronous cyclotron C400 has been designed by IBA-JINR collaboration. This cyclotron will be used for radiotherapy with proton, helium and carbon ions. The 12C6+and 4He2+ ions will be accelerated to the energy of 400 MeV/amu, the protons will be extracted at the energy 265 MeV. The C400 construction is started in 2010 in frame of the Arharde project (France).
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