| Paper | Title | Other Keywords | Page |
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| TUPJE061 | Injection Studies for the Diamond Storage Ring | injection, kicker, storage-ring, lattice | 1768 |
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The Diamond storage ring will be upgraded during 2016 by replacing one of the existing double bend achromat (DBA) cells with a double-DBA (DDBA) cell*. It is anticipated that both the on and off momentum dynamic aperture will reduce as a result of this change. In order to prepare for this eventuality, injection into the Diamond storage ring has been recently studied in detail. In particular, the oscillation amplitude, angle and energy of the injected beam have been determined, along with the position of the stored beam with respect to the septum plate. Following these studies, the injected beam energy has been matched to the storage ring, and plans have been put in place to move the injection septum 4 mm closer to the stored beam centre line.
*R.P. Walker et al., “The Double-Double Bend Achromat (DDBA) Lattice Modification for the Diamond Storage Ring”, Proc. IPAC 2014, MOPRO103, (2014) |
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| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-TUPJE061 | ||
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| TUPJE066 | Development of an Abort Kicker at APS to Mitigate Beam Loss-induced Quenches of the Superconducting Undulator | kicker, injection, beam-losses, simulation | 1787 |
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Funding: Work supported by U. S. Department of Energy, Office of Science, under Contract No. DE-AC02-06CH11357. The first superconducting undulator (SCU0) at the Advanced Photon Source (APS) has been delivering 80-100 keV photons for user science since January 2013. SCU0 often quenches during beam dumps triggered by the machine protection system (MPS). SCU0 typically recovers quickly after a quench, but SCU1, a second, longer device to be installed in 2015, may take longer to recover. We tested using injection kickers as an abort system to dump the beam away from SCU0 and the planned location of SCU1. An alternate trigger was tested that fires the kickers with MPS. We demonstrated that controlling the beam dump location with kickers can significantly reduce the beam losses at SCU0, as measured by fiber optic (FO) beam loss monitors (BLMs), and can also prevent a quench. A dedicated abort kicker system has been developed based on elegant simulations. A spare injection kicker was modified to produce the required waveform. Injection kicker tests, simulations, and the abort kicker design are described. Demonstration of this strategy in APS has implications for the APS Upgrade, where more SCUs are planned. |
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| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-TUPJE066 | ||
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| TUPJE072 | Advanced Photon Source Injection Related Simulation and Measurement | injection, simulation, lattice, operation | 1806 |
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Funding: Work supported by the U.S. Department of Energy, Office of Science, under Contract No. DE-AC02-06CH11357. Injection efficiency is one of the key factors in ensuring successful operation of storage ring light sources. In this paper, injection simulation and measurement studies at the Advanced Photon Source will be presented. The tracking simulations and measurements are compared in terms of the dynamic aperture and injection efficiency. Injection efficiency is also measured on the betatron tunes space and on different stored beam orbits. yisun@aps.anl.gov |
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| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-TUPJE072 | ||
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| TUPHA004 | NSLS-II Storage Ring Injection Optimization | injection, kicker, betatron, timing | 1968 |
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| The National Synchrotron Light Source II (NSLS-II) is a state of the art 3 GeV third generation light source at Brookhaven National Laboratory. The SR is designed to work in top-off injection mode. The injection straight includes a septum and four fast kicker magnets with independent amplitude and timing control. The beam injection is designed as 9.5 mm off-axis in x plane and on-axis injection in y plane. To capture the injected beam within the SR acceptance for high injection efficiency, it requires 6-D phase space match. Besides that, the fast kickers formed local bump is also required to be locally to minimize the injected beam extra betatron oscillation and keep the stored beam disturbance within the specification, 10% beam size to minimize the injection transient. This paper will present the beam results before and after optimization. | |||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-TUPHA004 | ||
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| TUPTY039 | LHC Transfer Lines and Injection Tests for Run 2 | injection, extraction, kicker, operation | 2098 |
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| The transfer lines for both rings of the LHC were successfully re-commissioned with beam in preparation for the start-up of Run 2. This paper presents an overview of the transfer line and sector tests performed to bring the LHC back into operation after a two-year period of shutdown for consolidation and upgrade. The tests enabled the debugging of critical software and hardware systems and validated changes made to the transfer and injection systems. The beam-based measurements carried out to validate the optics and machine configuration are summarised along with the performance of the hardware systems. | |||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-TUPTY039 | ||
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| TUPTY050 | Considerations for the Beam Dump System of a 100 TeV Centre-of-mass FCC hh Collider | extraction, kicker, collider, optics | 2132 |
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| A 100 TeV centre-of-mass energy frontier proton collider in a new tunnel of 80–100 km circumference is a central part of CERN’s Future Circular Colliders (FCC) design study. One of the major challenges for such a machine will be the beam dump system, which for each ring will have to reliably abort proton beams with stored energies in the range of 8 Gigajoule, more than an order of magnitude higher than planned for HL-LHC. The transverse proton beam energy densities are even more extreme, a factor of 100 above that of the presently operating LHC. The requirements for the beam dump subsystems are outlined, and the present technological limitations are described. First concepts for the beam dump system are presented and the feasibility is discussed, highlighting in particular the areas in which major technological progress will be needed. The potential implications on the overall machine and other key subsystems are described, including constraints on filling patterns, interlocking, beam intercepting devices and insertion design. | |||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-TUPTY050 | ||
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| WEPMN068 | Upgrade of the CERN SPS Extraction Protection Elements TPS | extraction, kicker, vacuum, proton | 3083 |
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| In 2006 the protection devices upstream of the septa in both extraction channels of the CERN SPS to the LHC were installed. Since then, new beam parameters have been proposed for the SPS beam towards the LHC in the framework of the LIU project. The mechanical parameters and assumptions on which these protection devices presently have been based, need validation before the new upgraded versions can be designed and constructed. The paper describes the design assumptions for the present protection device and the testing program for the TPSG4 at HiRadMat to validate them. Finally the requirements and the options to upgrade both extraction protection elements in the SPS are described. | |||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPMN068 | ||
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| WEPHA030 | EMI Measurement for TPS Booster Kicker and Septum Systems | kicker, booster, injection, network | 3179 |
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| The purpose of this paper is to estimate the conducted and radiated Electromagnetic Interference (EMI) for subsystems in the TPS booster ring. A LISN (Line Impedance Stabilizing Network) system with a wide frequency range was conducted to measure the EMI spectrum of pulsed magnet system. The radiated EMI was tested by magnetic field probe, which the measurement frequency range is 100 kHz ~ 3 GHz. A stray current was tested by wide frequency current transformer in order to measure the conducted current for kicker and septum systems. According to the experiment results, the stray current could flow through the other subsystems or booster chamber, and it might be affected the stability of booster operation. Therefore reducing and eliminating the interference of EM waves will be a very important issue. The EMI prevention scheme will be continued. | |||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPHA030 | ||
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| THPF023 | Massless Beam Separation System for Intense Ion Beams | shielding, dipole, beam-transport, vacuum | 3736 |
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The ExB chopper* in the Low Energy Beam Transport (LEBT) section of the accelerator-driven neutron source FRANZ** will form the required pulses with a repetition rate of 257 kHz out of the primary 120 keV, 50 mA DC proton beam. A following beam separation system will extract the deflected beam out of the beamline and minimize the thermal load by beam losses in the vacuum chamber. To further avoid an uncontrolled production of secondary particles, a novel massless septum system is designed for the beam separation. The septum system consists of a static C-magnet with optimized pole shapes, which will extract the beam with minimal losses, and a magnetic shielding tube, which will shield the transmitted pulsed beam from the fringing field of the dipole. The magnetic field and the beam transport properties of the system were numerically investigated. A main deflection field of about 250 mT was achieved, whereas the fringing field was reduced to below 0.3 mT on the beam axis at 60 mm distance from the dipole. With this settings, the beam was numerically transported through the system with minimal emittance growth. Manufacturing of the septum system has started.
* Wiesner, C., et al. "Chopping High-Intensity Ion Beams at FRANZ", WEIOB01, LINAC 2014. ** Meusel, O., et al. "FRANZ–Accelerator Test Bench And Neutron Source", MO3A03, LINAC 2012. |
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| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF023 | ||
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| THPF089 | Beam Transfer to the FCC-hh Collider from a 3.3 TeV Booster in the LHC Tunnel | injection, kicker, collider, optics | 3901 |
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| Transfer of the high brightness 3.3 TeV proton beams from the High Energy Booster (HEB) to the 100 TeV centre-of-mass proton collider in a new tunnel of 80–100 km circumference will be a major challenge. The extremely high stored beam energy means that machine protection considerations will constrain the functional design of the transfer, for instance in the amount of beam transferred, the kicker rise and fall times and hence the collider filling pattern. In addition the transfer lines may need dedicated insertions for passive protection devices. The requirements and constraints are described, and a first concept for the 3.3 TeV beam transfer between the machines is outlined. The resulting implications on the parameters and design of the various kicker systems are explored, in the context of the available technology. The general features of the transfer lines between the machines are described, with the expected constraints on the collider layout and insertion lengths. | |||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF089 | ||
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| THPF097 | Feasibility Study of a New SPS Beam Dump System | extraction, kicker, quadrupole, proton | 3930 |
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| The CERN Super Proton Synchrotron (SPS) presently uses an internal beam dump system with two separate blocks to cleanly dispose of low and high energy beams. In view of the increased beam power and brightness needed for the LHC Injector Upgrade project for High Luminosity LHC (HL-LHC), the performance of this internal beam dump system has been reviewed for future operation. Different possible upgrades of the beam dumping system have been investigated. The initially considered solution for the SPS Beam Dump System is to design a new, dedicated external system, with a dump block in a shielded cavern separated from the machine ring. Unfortunately this solution is not feasible with the present technology. In this paper, the design requirements and the possible solutions are investigated, including considering a new internal beam dump in the Long Straight Section 5 (LSS5). | |||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF097 | ||
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| THPF125 | MARS Tracking Simulations for the Mu2e Slow Extracted Proton Beam | extraction, scattering, simulation, beam-losses | 4010 |
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| Particle tracking taking into account interactions with fields and materials is necessary for proper evaluation of the resonant extraction losses and geometry optimization for the extraction beam line. This paper describes the tracking simulations for the Mu2e Resonant Extraction and discusses the geometry choices made based on these simulations. | |||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF125 | ||
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