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MOPAB012 | Study of the 2015 Top Energy LHC Collimation Quench Tests Through an Advanced Simulation Chain | ion, simulation, proton, collimation | 100 |
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While the LHC has shown record-breaking perfor-mance during the 2016 run, our understanding of the behaviour of the machine must also reach new levels. The collimation system and especially the betatron cleaning insertion region (IR7), where most of the beam halo is intercepted to protect superconducting (SC) magnets from quenching, has so far met the expectations but could nonetheless pose a bottleneck for future operation at higher beam intensities for HL-LHC. A better under-standing of the collimation leakage to SC magnets is required in order to quantify potential limitations in terms of cleaning efficiency, ultimately optimising the collider capabilities. Particle tracking simulations com-bined with shower simulations represent a powerful tool for quantifying the power deposition in magnets next to the cleaning insertion. In this study, we benchmark the simulation models against beam loss monitor measure-ments from magnet quench tests (QT) with 6.5 TeV pro-ton and 6.37Z TeV Pb ion beams. In addition, we investi-gate the effect of possible imperfections on the collima-tion leakage and the power deposition in magnets. | |||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB012 | ||
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MOPIK052 | Generation of Highly-Charged Carbon Ions from Thin Foil Target | target, ion, laser, plasma | 635 |
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Funding: This work was supported by the U.S. Department of Energy and National Aeronautics and Space Administration. Generation of highly-charged heavy ions such as fully stripped C6+ of more than hundreds mA of beam current can be possible only with a laser ablation ion source (LIS). Heavy ions are produced from a solid target irradiated by a pulsed high power laser. Recent study showed that only sub-micron range of surface layer contributes for the generation of highly-charged heavy ions. In this paper, we experimentally investigated the difference of the performance of highly-charged carbon ion production from graphite targets of different thickness (25, 70, 254, and 3000 'm) to seek the possibility of a rolled target to overcome the limitation of a target lifetime. |
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DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPIK052 | ||
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MOPIK053 | Design Study of High Repetition Rate Laser Ion Source for High Power Beam Production | target, laser, ion, plasma | 638 |
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Funding: This work was supported by the U.S. Department of Energy and National Aeronautics and Space Administration. We are studying a laser ion source (LIS) for a high average beam power heavy ion beam production. A LIS is the most intense source of pulsed highly-charged ions using a laser ablation scheme. By increasing the repetition rate, a LIS based heavy ion beam would approach the average beam power based on a low beam current and continuous beam regime. In addition, a high-repetition-rate LIS can be used as a heavy ion source for a medical accelerator with spot scanning technique. This paper will describe the requirements to realize the high repetition rate operation. |
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DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPIK053 | ||
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TUPVA055 | Further Investigations for a Superconducting cw-LINAC at GSI | linac, cavity, ion, solenoid | 2197 |
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For superconducting (sc) accelerator sections operating at low and medium beam energies very compact accelerating-focusing structures are strongly required, as well as short focusing periods, high accelerating gradients and very short drift spaces. The Facility for Antiproton and Ion Research (FAIR) is going to use heavy ion beams with extremely high peak current from UNiversal Linear ACcelerator (UNILAC) and the synchrotron SIS18 as an injector for the SIS100. To keep the GSI-Super Heavy Element program competitive on a high level and even beyond, a standalone sc continuous wave LINAC in combination with the upgraded GSI High Charge State injector is envisaged. In preparation for this, testing of the first LINAC section (financed by HIM and GSI) as a demonstration of the capability of 216 MHz multi gap Crossbar H-structures (CH) is still ongoing, while an accelerating gradient of 9.6 MV/m (4K) at a sufficient quality factor has been already reached in a horizontal cryostat. As a final R&D step towards an entire LINAC three advanced cryo modules, each comprising two short CH cavities, should be built until 2019, serving for first user experiments at the coulomb barrier. | |||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA055 | ||
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TUPVA056 | Ionization Loss and Dynamic Vacuum in Heavy Ion Synchrotrons | injection, ion, vacuum, synchrotron | 2201 |
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Dynamic vacuum effects, induced by charge exchange processes and ion impact driven gas desorption, generate an intensity limitation for high intensity heavy ion synchrotrons. In order to reach ultimate heavy ion intensities, medium charge state heavy ions are used. The cross sections for charge exchange in collisions with residual gas molecules for such beams are much higher, than for highly charged heavy ion beams. Therefore high pumping power is required to obtain a very low static residual gas pressure and to suppress vacuum dynamics during operation. In modern heavy ion synchrotrons different techniques are employed: NEG-coating, cryogenic pumping, and low-desorption ion-catcher. The unique StrahlSim code allows the comparison of different design options for heavy ion synchrotrons. Different aspects of dynamic vacuum limitations are summarized, such as the dependence on different injection parameter. A comparison between a room temperature and a cryogenic synchrotron from the vacuum point of view is given. | |||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA056 | ||
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TUPVA072 | Conceptual Injector Design for an Electron-Ion-Collider Front-End | ion, rfq, linac, cavity | 2246 |
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An electron-hadron collider (EIC) could be the next large-scale nuclear physics facility in the United States. A hadron linac with a final energy of 40 AMeV (heavy ions) and up to 130 MeV for protons with an upgrade path to higher energies is required as the first step of the hadron accelerator chain. From a cost point of view superconducting technology seems to be the better choice above an energy of about 5 AMeV compared to a room temperature (rt) solution. This paper describes the conceptual design of a rt front-end up to an energy of 5 AMeV appropriate as initial element of the EIC hadron linac. It consists of two separate injectors based on efficient H-mode cavities, one optimized for heavy ions (Pb30+) and the other optimized for protons and deuterons. Beam dynamics and first RF simulations are presented. | |||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA072 | ||
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TUPVA114 | Nuclotron New Beam Channels for Applied Researches | ion, target, radiation, ion-source | 2355 |
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Three new experimental areas are organized for applied physics researches in frame of realization of the accelerator facility NICA. New beamlines are under development for applied researches on Nuclotron accelerator. The ion beams with energy of 250-800 MeV/n extracted from Nuclotron will be used for the radio-biological and materials research and modeling of the cosmic rays interactions with microchips. The equipment of two experimental stations is designed by JINR-ITEP collaboration for these applied researches. The design of the magnetic system, the beam diagnostic equipment, the target stations are developed in frame of this project. The design and construction of these beamlines and experimental stations are planned in 2017-2020. Low ion energy station will be installed in 2021-2023 inside the transportation channel from heavy ion linac HILAC. Two new stations for applied researches will be constructed in 2021-2023 with ion beams at energy up 4.5 GeV/u. | |||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA114 | ||
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TUPVA116 | Commissioning of the New Heavy Ion Linac at the NICA Project | rfq, ion, linac, ion-source | 2362 |
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The new accelerator complex Nuclotron-based Ion Collider fAcility (NICA) is now under development and construction at JINR, Dubna. This complex is assumed to operate using two injectors: modernized old Alvarez-type linac LU-20 as the injector of light polarized ions and a new Heavy Ion Linear Accelerator HILAc - injector of heavy ions beams. The new heavy ion linac accelerate ions with q/A values above 0.16 to 3.2 MeV/u is under commissioning. The main components are 4-Rod-RFQ and two IH drift tube cavities is operated at 100.6 MHz. Main results of the HILAc commissioning with carbon beam from the laser ion source are discussed. | |||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA116 | ||
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WEPVA049 | Vacuum- and Bake-Out-Testbenches for the HESR at FAIR | dipole, vacuum, quadrupole, ion | 3366 |
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The High-Energy Storage Ring (HESR) is one part of the international Facility for Antiproton and Ion Research (FAIR) at GSI Darmstadt. Forschungszentrum Jülich (IKP and ZEA-1) is responsible for the design and development of the HESR. The HESR is designed for antiprotons and heavy ion experiments as well. Therefore the vacuum is required to be 10-11 mbar or better. To achieve this also in the curved sections, where 44 bent dipole magnets are installed, NEG coated dipole chambers will be used to reach the needed pumping speed and capacity. For activation of the NEG a bake-out system is needed. Two test benches were installed to investigate the required equipment needed to reach this low pressure: A vacuum test bench to investigate the influence of different types and quantity of vacuum pumps for the straight sections of the HESR A bake-out test bench for checking the achievable end pressure and develop the bake-out system for the NEG coated dipole chambers in the curved sections of the HESR The results of the tests and the bake-out concept including the layout of the control system and the special design of the heater jackets inside the dipoles and quadrupoles are presented.
1 Central Institute of Engineering, Electronics and Analytics- Engineering and Technology ZEA-1 2 Institute for nuclear physics |
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DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPVA049 | ||
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THPAB034 | Generation of Short Intense Heavy-Ion Pulses in HIAF | acceleration, ion, injection, cavity | 3774 |
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The HIAF is a new accelerator complex under design at IMP to provide intense primary and radioactive ion beams for nuclear physics, atomic physics, high energy density physics and other applications. As a key part of HIAF, the Booster Ring (BRing) is designed to accumulate and accelerate heavy ion beams provided by iLinac up to high intensity and energy. The high quality, well focused, strongly bunched intense Uranium beam (U34+) with high energy and high intensity of 1011 will open a new area for the HED physics research in laboratory. Based on the beam parameters of 238U34+ proposed by the BRing, the two critical issues of producing short bunch with high beam intensity are studied. One is efficiency of adiabatic capture which can be a necessary prerequisite to ensure the beam intensity, and the other one is bunch compression in longitudinal which is an effective way of producing short pulse duration bunch. In this article, the analytical calculations and tracking simulations are described, the capture efficiency and possible bunch length under the action of planning RF system are presented | |||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB034 | ||
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THPIK002 | Development of a Range of High Peak Power Solid-State Amplifiers for Use in the Heavy Ion Linac at JINR, Dubna | cavity, ion, linac, impedance | 4108 |
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A range of LDMOS based amplifiers rated for up to 340kW peak power and operating at 100.625MHz were developed for use as RF sources for driving cavities in the heavy ion LINAC (HILac) at JINR, Dubna. The final solution had to be compact and competitive while addressing technical challenges such as phase and amplitude stability, long term reliability, reflected power handling and serviceability. Design considerations and performance results are presented. | |||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPIK002 | ||
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THPVA042 | Semi-Autonomous Device for Visual Inspection of Vacuum Beamlines of Particle Accelerators | vacuum, ion, synchrotron, diagnostics | 4528 |
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Due to the closed structure of ultra-high vacuum beamline systems, a visual inspection of the internal pipe is hardly feasible. For instance, when opening the accelerator vacuum system, an endoscope can be used to inspect the internals. However, this proves to be impractical in case of large, curved accelerator vacuum systems with complex geometries. It is more efficient to open the system only at one or two locations and to use a mobile semi-autonomous inspection device with optical imaging. A mobile robot is currently under development in our laboratory for the planned heavy ion synchrotron SIS100 at FAIR. A multitude of vacuum chamber types with different height levels as well as gaps must be traversed reliably by the robot. We present a modular wheel-based mobile robot prototype with joints between the modules which let the robot climb to different height levels by lifting the modules successively. | |||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA042 | ||
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FRYAA1 | Discovery of the Island of Stability for Super Heavy Elements | neutron, target, ion, detector | 4848 |
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The existence of a region of hypothetical Super Heavy Elements (SHE) forming region (island) with high stability in the vicinity of the doubly magic nucleus 298 114 was postulated in the mid-1960s. For more than 30 years, scientists hard searched for naturally occurring SHEs and unsuccessfully attempted to synthesize them using heavy ion accelerators. Over the past 15 years the breakthroughs in heavy element synthesis has achieved, using rare actinide targets irradiated with 48Ca beams. More than 52 neutron-rich nuclei including the isotopes of the new element 113-118 and their alpha-decay product where synthesized for the first time. SHE with Z> 40% larger than that of Bi show an impressive extension in nuclear survival: the map of the nuclides have extended up to mass number 294, the 7th row of the periodic Table have completed. The talk will cover this achievement and will give an outlook for the field including any plans at the new facilities: SHE-Factory, SPIRAL-2 and others. | |||
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Slides FRYAA1 [9.750 MB] | ||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-FRYAA1 | ||
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