| Paper | Title | Other Keywords | Page |
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| MOPWO001 | Moment Method Beam Dynamics Code Development: Extended for Radio Frequency Quadrupole Simulations | rfq, simulation, multipole, quadrupole | 879 |
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Funding: This research is funded by grant “KUL 3E100118” “Electromagnetic Field Simulation for Future Particle Accelerators”, project FP7-Euratom No. 269565 and the Belgian Nuclear Research Centre (SCK•CEN). A Radio Frequency Quadrupole (RFQ) enables acceleration of a continuous low-velocity hadron beam, combining velocity independent electric focusing and adiabatic bunching, resulting in high-current compact bunches with nearly 100% capture and transmission efficiency. With virtually no post-construction tuning capabilities, an RFQ design phase requires all transient parameters (machining tolerances, thermo-mechanical deformation factors). This allows the determination of acceptable tolerances on input and output beam characteristics, of major importance in beam availability and beam trip prevention, and makes fast beam dynamics simulation codes incorporating RFQs indispensable. This article presents the implementation and validation of an RFQ beam line element into V-Code, a moment method beam dynamics simulation code. V-Code time integrates the Vlasov equation for an initial particle distribution represented by a discrete set of characteristic moments, accounting for all exerting internal and external forces. V-Code delivers highly accurate beam dynamics results with precision and efficiency advantages in terms of average or rms beam dimensions, projected emittances or total energy. |
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| TUPWA041 | Reduction of Secondary Electron (SEY) Yield Figures on Smooth Metallic Surfaces by Means of Magnetic Roughness | electron, permanent-magnet, gun | 1799 |
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| High secondary electron yield of metallic surfaces used in accelerator and also space applications is of general concern. In addition to several well known coating techniques and microscopic or macroscopic mechanical roughness (grooves) which may significantly increase microwave losses the concept of magnetic surface roughness has been proposed recently. In this concept a smooth and very well conductimg surface with low microwave losses is maintained, but underneath this surface a large number of tiny permanent magnets are located to build a rough magnetic equipotential structure. In this paper we present and discuss measurement of the SEY and the improvement in terms of SEY for different parameter ranges | |||
| WEPWO028 | 10×10mm2 MgB2 Film Fabricated by HPCVD as a Candidate Material for SRF Cavit | cavity, SRF, superconductivity, heavy-ion | 2375 |
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| Magnesium diboride (MgB2) is one of candidate material for superconducting radio frequency cavities because of its good features: high transition temperature of ~39K and absence of weak links between grains which prevents other high-Tc superconducting materials, such as YBCO. Previous study of MgB2 are mainly focused on the films’ superconducting properties which are fabricated on Al2O3, SiC or some metal substrates with small scale less than 10×10 mm2. In this work we explore a technique to deposit clean and large-scale MgB2 films on Mo substrate, which is expected to provide a probable way to fabricate MgB2 thin-film cavities.. The measurement results show that its superconducting properties and mechanical behaviors are as good as those fabricated on small-scale metal substrates. | |||
| WEPME036 | The Development of LLRF System at PAL | LLRF, controls, cavity, monitoring | 3004 |
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| The PAL has been developing the low level radio frequency (LLRF) system. The required field stabilities of the LLRF system are within ±0.75% in amplitude and 0.35° in phase in a cavity. All the hardware including RF front–end, FPGA with peripherals such as ADC, DAC, Oscillator and digital interface were assembled. The sub-modules for the RF signal processing were written by VHDL and integrated to test at the local facility. The macroblaze software processor was implemented to make the system simple in interfacing to peripherals and to secure flexibility later. This paper described the microblaze processor which was ported into the VERTEX6 FPGA. And also this paper showed the test results of the each module and integrated into the full system. | |||
| THPEA030 | Improved Vector Modulator Card for MTCA-based LLRF Control System for Linear Accelerators | LLRF, controls, power-supply, monitoring | 3207 |
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| Modern linear accelerators require high-precision RF field regulation of accelerating cavities. A critical component to achieve high-precision in the feedback loop a Low Level Radio Frequency (LLRF) controller is the vector modulator driving the high power RF chain. At FLASH, the Free Electron Laser in Hamburg and European XFEL the LLRF controls are based on MTCA.4 platform. This paper describes the concept, design and performance of an improved vector modulator module (DRTM-VM2). It is constructed as Rear Transition Module (RTM). The module consists of digital, analog, diagnostic and management subsystems. FPGA from Xilinx Spartan 6 family receives data from control module (AMC) using Multi-Gigabit Transceivers (MGTs). The FPGA controls the analog part which includes fast, high-precision DACs, I/Q modulator chips, programmable attenuators, power amplifier and fast RF gates for external interlock system. Pin assignment on the Zone3 connector is compliant with digital class D1.2 recommendations proposed by DESY. The design has been optimized for mass production and for easy extends to wider frequency range. Electronic switches offer software configuration of power and clock sources. | |||
| THPFI066 | Performance Enhancement of Electrical Power System at NSRRC | controls, synchrotron, power-supply, synchrotron-radiation | 3448 |
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| A lot of efforts have been devoted to improve the reliability, the stability and the power quality of NSRRC electrical power system in recent years. These improvements include the power factor correction, solving nuisance tripping of air circuit breakers, replacing old-type capacitor banks, installing automatic voltage regulators and designing multi-source backup system with automatic transfer switch. All these improvement works are to ensure the reliable operation of NSRRC power system and reduce the electrical power accidents during the normal operation. Further, it can also provide the convenience for the electric power dispatching of NSRRC during the regular maintenance of power system. | |||
| THPWA003 | Novel Crate Standard MTCA.4 for Industry and Research | LLRF, controls, monitoring, free-electron-laser | 3633 |
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Funding: This project is funded by the Helmholtz Association (Helmholtz Validation Fund HVF-0016). MTCA.4 is a novel electronic standard derived from the Telecommunication Computing Architecture (TCA) and championed by the xTCA for physics group, a network of physics research institutes and electronics manufacturers. MTCA.4 was released as an official standard by the PCI Industrial Manufacturers Group (PICMG) in 2011. Although the standard is originally physics-driven, it holds promise for applications in many other fields with equally challenging requirements. With substantial funding from the Helmholtz Association for a two-year validation project, DESY currently develops novel, fully MTCA.4-compliant components to lower the barriers to adoption in a wide range of industrial and research use scenarios. Core activities of the project are: refinement, test and qualification of existing components; market research, market education (web information services, workshops); coordinated development of missing MTCA.4 components; further advancement of the standard beyond the current PICMG specification; investigation of measures to counteract electro-magnetic interferences and incompatibilities; training, support and consultancy. This paper summarizes intermediate results and lessons learned at project half-time. |
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| THPWO049 | Preliminary Beam Dynamics and Structure Design of One 50mA/CW RFQ with Ramped Inter-vane Voltage | rfq, simulation, linac, quadrupole | 3881 |
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Funding: Work supported by National Natural Scienccontracte Foundation of China (Major Research Plan Grant No. 91126003 and Project 11175096). The beam dynamics and structure design of a ramped-voltage CW RFQ (Radio Frequency Quadrupole) accelerator for a NSFC (National Natural Science Foundation of China) Project at Tsinghua University is presented in this paper. The ramped-voltage RFQ, in which the inter-vane voltage increases from the low-energy end to the high-energy end, is compact and efficient. The RFQ, with the operating frequency of 325 MHz, will capture a 50 mA/CW, 50 keV proton beam from the RF source and accelerate it to 3 MeV, an energy suitable for chopping and injecting the beam in a conventional Drift Tube Linac. After optimization, the total length is as short as 2.9 m and the transmission rate is above 97%. The design of RFQ structure including the undercuts will also be shown. |
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