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| MOPVA054 | High Power RF Coupler for the CW-Linac Demonstrator at GSI | cavity, linac, simulation, ion | 990 |
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| The planned super-heavy element (SHE) research project investigates heavy ions near the coulomb barrier in future experiments. A superconducting (sc) continuous wave (cw) CH-Linac Demonstrator was developed and installed behind the High Charge State Injector (HLI) at GSI Darmstadt, Germany. In future the advanced cw-LINAC setup, with several CH-cavities, will accelerates the heavy ion beam from HLI with an energy of 1.4 MeV/u up to 3.5 - 7.3 MeV/u. The RF power of several kW will be coupled capacitively into the CH-cavities with minimal reflection at an operation frequency of 217 MHz. Two ceramic windows (Al2O3) are installed inside the RF coupler, to reduce the premature contamination of the cavity and as an additional vacuum barrier. The CH-cavity will be operated at cryogenic temperature (4 K) and will be increased to room temperature along the RF coupler. The optimally adapted RF coupler design, providing minimal RF losses and simultaneously maximal performance, was optimized by electromagnetic simulations. An RF coupler design with a reflection-free RF adaptor as well as the temperature distribution along the coupler will be presented. | |||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPVA054 | ||
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| TUPAB013 | Beam Dynamics Study and Electrodynamics Simulations for the CW RFQ | rfq, cavity, simulation, linac | 1333 |
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A compact university scale CW research proton accelerator, as well as driver linac with three branches of experimental beam lines, delivering beam energy of 3, 30 and 100 MeV for experiments, are recently under development in Russia. First results of the beam dynamics simulations for such a linac were already shown in *. The recently developed advanced RFQ cavity design is presented. The low energy beam transport line (LEBT), dedicated to transport proton beam from an ECR ion source, as well as to match beam emittance to the RFQ acceptance, was investigated. The results of beam dynamics simulations for LEBT are discussed.
* W.Barth, T.Kulevoy, S.Polozov, S.Yaramyshev, Proc. of HB-2016, 188-190. |
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| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPAB013 | ||
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| TUPAB026 | Status of the Cryogenic Undulator CPMU-17 for EMIL at BESSY II / HZB | vacuum, undulator, permanent-magnet, feedback | 1372 |
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| The CPMU-17 is the hard X-ray radiation source of a canted double undulator system for the Energy Materials In-situ Laboratory EMIL at BESSY II [1]. Various ambitious concepts are realized in this undulator such as Dy-hardened PrFeB-magnets, direct liquid Nitrogen cooling, dual loop feedback gap drive based on an optical micrometer and a low permeability stainless steel In-Vacuum(IV)-girder without keepers. The magnets are sorted according to Helmholtz coil and stretched wire data. Reproducibility and accuracy measurements of two IV-measurement tools needed for the CPMU-17 are presented: an IV-Hall probe bench and an IV-Moving Wire. | |||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPAB026 | ||
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| TUPIK017 | Next Generation Plasma Cell for PWFA Experiments at PITZ | plasma, laser, experiment, electron | 1715 |
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A proof-of-principle experiment for the AWAKE experiment is ongoing at the Photo-Injector Test Facility at DESY, Zeuthen site (PITZ). The goal of the experiment is to observe and measure the energy and density self-modulation of a long electron beam passing through a laser-generated Lithium plasma*. Key devices of the experiment are a heat pipe based plasma cell, a photocathode laser system which enables production of long electron beams with sharp rising edges and well-developed diagnostics at PITZ, including a transverse deflecting cavity and a high-resolution electron spectrometer. In this report we present the current status of the experiment, including the latest updates of the experimental setup. The plasma cell is a lithium heat pipe oven with inert gas buffers at all input/output ports. An ArF ionization laser is coupled through side ports. Main improvements of the second generation plasma cell are an altered geometry of side arms and a new heat pipe design. Among other updates are an improved ArF laser beamline and new electron windows. We present here measurements of plasma density and homogeneity as well as results of beam transport studies for the experiment.
*O. Lishilin, M. Gross, et al., «First results of the plasma wakefield acceleration experiment at PITZ», NIM A, Volume 829, 1 September 2016, Pages 37-42, http://dx.doi.org/10.1016/j.nima.2016.01.005 |
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| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPIK017 | ||
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| TUPIK051 | Statistics on High Average Power Operation and Results from the Electron Beam Characterization at PITZ | gun, operation, cathode, vacuum | 1806 |
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| The Photo Injector Test Facility at DESY in Zeuthen (PITZ) develops, tests and characterizes high brightness electron sources for FLASH and European XFEL. Since these FELs work with superconducting accelerators in pulsed mode, also the corresponding normal-conducting RF gun has to operate with long RF pulses. Generating high beam quality from the photo-cathode RF gun in addition requires a high accelerating gradient at the cathode. Therefore, the RF gun has to ensure stable and reliable operation at high average RF power, e.g. 6.5 MW peak power in the gun for 650 μs RF pulse length and 10 Hz repetition rate for the European XFEL. Several RF gun setups have been operated towards these goals over the last years. The latest gun setup is in operation since March 2016 and includes RF Gun 4.6 with an improved contact spring design. The RF input distribution consists of a coaxial coupler, a T-combiner and 2 RF windows from DESY production. In this contribution we will present statistics on the high average power operation and results from the characterization of the produced electron beam. | |||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPIK051 | ||
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| TUPIK064 | Application of Smoothing Analysis in the Alignment and Installation Process of Particle Accelerator | alignment, storage-ring, software, closed-orbit | 1839 |
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| With the development of technology and theory of particle accelerator, the new particle accelerators will be built in the near future. Comparing with the running accelerators, higher efficiency and accuracy of installation and alignment are required. It is necessary for all the storage ring magnets to be placed with a high relative accuracy to meet the stringent demands of accelerator physics. Smoothing analysis is a practical method considering both relative accuracy and work efficiency. This article mainly introduces the principle and application of smoothing analysis. | |||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPIK064 | ||
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| WEPAB101 | Lattice Optimization Using Jupyter Notebook on HPC Clusters | Linux, lattice, software, operation | 2818 |
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Funding: Work supported by the Director Office of Science of the U. S. Department of Energy under Contract No. DE-AC02-05CH11231 Tracy accelerator simulation library was originally developed for the Advanced Light Source (ALS) design studies at LBNL in the late 1980's. It was originally written in Pascal, later ported to C++, and then to C#. It is still actively updated and currently used by the ALS Upgrade Project (ALS-U) to design and to optimize the lattice. Recently, it has been reconstructed to provide ease of use and flexibility by leveraging the quickly growing Python language. This paper describes our effort of porting it to Jupyter Notebook on our institutional High-Performance Computing (HPC) clusters. |
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| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPAB101 | ||
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| THPAB044 | Development of Computational Tools for Noise Studies in the LHC | simulation, GPU, emittance, beam-beam-effects | 3807 |
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| Noise can have a significant impact on the beam dynamics in the LHC, enhancing diffusion processes and leading to emittance blowup. In order to study the details of such effects with computer simulations, a new set of tools is being developed. In particular, a demonstrator GPU-based particle tracker has been built profiting from the technology provided by the NVRTC Cuda library. Its performances for short term beam dynamic simulations in presence of many macro particles are highly promising. In addition, the Numerical Analysis of Fundamental Frequencies (NAFF) algorithm has been thoroughly inspected. Several alternatives to its fundamental steps have been investigated in a modern C++ implementation. The method was also used to produce Frequency Maps and benchmark these tools with other simulations. | |||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB044 | ||
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| THPIK115 | Status of the Perpendicular Biased 2nd Harmonic Cavity for the Fermilab Booster | cavity, booster, simulation, solenoid | 4366 |
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Funding: Operated by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the United States Department of Energy. This is a status report on the 2nd harmonic cavity for the Fermilab Booster as part of the Proton Improvement Plan (PIP) for increasing beam transmission efficiency, and thus reducing losses. A set of tuner rings has been procured and is undergoing quality control tests. The Y567 tube for driving the cavity has been successfully tested at both injection and extraction frequencies. A cooling scheme for the tuner and cavity has been developed after a thorough thermal analysis of the system. RF windows have been procured and substantial progress has been made on the mechanical designs of the cavity and the bias solenoid. The goal is to have a prototype cavity ready for testing by the end of 2017. |
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| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPIK115 | ||
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