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MOPO106 |
New Digital LLRF System for HIT |
controls, cavity, LLRF, linac |
227 |
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- E. Feldmeier, Th. Haberer, A. Peters
HIT, Heidelberg, Germany
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The Heidelberg Ion Therapy Center HIT is in clinical operation since 2009. The accelerator complex consists of a linear accelerator and a synchrotron to provide carbon ions and protons for clinical use as well as helium and oxygen ions. The analog LLRF system for the linac should be replaced after more than 10 years of continuous operation. In its life-time the LLRF caused no interruption of the clinical operation with a downtime of more than 15 minutes. In order to keep the reliability in the next 10 years at least as high, a new digital LLRF system is planned. Further difficulties for the installation of a new system are due to the clinical full time usage of the accelerator and the short maintenance slots of only two days in series.
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO106
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About • |
paper received ※ 12 September 2018 paper accepted ※ 19 September 2018 issue date ※ 18 January 2019 |
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MOPO107 |
Performance Evaluation of the RF Reference Phase Stabilization System on Fiber-optical Link for KEK e−/e+ Injector LINAC |
linac, controls, EPICS, FPGA |
230 |
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- N. Liu, B. Du
Sokendai - Hayama, Hayama, Japan
- D.A. Arakawa, H. Katagiri, T. Matsumoto, S. Michizono, T. Miura, F. Qiu, Y. Yano
KEK, Ibaraki, Japan
- T. Matsumoto, T. Miura, F. Qiu
Sokendai, Ibaraki, Japan
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KEK e−/e+ injector is the 600 m J-shaped LINAC which has 8 RF sectors. Stabilization of RF phase reference for long distance transmission is necessary for stable RF operation. In the present system, single-mode fiber-optical links without feedback control are used from sector 2 to 5. For the SuperKEKB, the phase stability requirement is within 0.1 deg. rms. The more stable RF phase reference is necessary to improve the phase stability. In this paper, a feedback control system for RF reference phase stabilization is tested for system performance evaluation. The temperature and humidity characteristics of the electric and optical components and phase stabilized optical fiber (PSOF) with different wavelengths will also be presented.
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Poster MOPO107 [2.026 MB]
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO107
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About • |
paper received ※ 12 September 2018 paper accepted ※ 21 September 2018 issue date ※ 18 January 2019 |
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MOPO111 |
Development of New LLRF System at the J-PARC Linac |
LLRF, linac, FPGA, low-level-rf |
233 |
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- K. Futatsukawa, Z. Fang, Y. Fukui
KEK, Ibaraki, Japan
- Y. Sato
Nippon Advanced Technology Co., Ltd., Tokai, Japan
- S. Shinozaki
JAEA/J-PARC, Tokai-mura, Japan
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In the J-PARC linac, the LLRF system with the digital feedback (DFB) and the digital feedforward (DFF) was adopted for satisfying requirement of amplitude and phase stabilities. It has been operated without serious problems. However, it has been used since the beginning of the J-PARC and more than ten years have already passed since the development. The increase of the failure frequency for this system is expected. Additionally, it is difficult to maintain it for some discontinued boards of DFB and DFF and the older developing environment of software. Therefore, we are starting to study the new LLRF system of the next generation. In the present, we are exploring several possibilities of a new way and investigating each advantage and disadvantage. The project and the status of the development for the new system in the J-PARC linac LLRF are introduced.
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO111
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About • |
paper received ※ 22 September 2018 paper accepted ※ 09 November 2018 issue date ※ 18 January 2019 |
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TUPO029 |
Highlights of the XM-3 Cryomodule Tests at DESY |
cavity, cryomodule, FEL, operation |
388 |
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- J. Branlard, V. Ayvazyan, A. Bellandi, J. Eschke, C. Gumus, D. Kostin, K.P. Przygoda, H. Schlarb, J.K. Sekutowicz
DESY, Hamburg, Germany
- W. Cichalewski
TUL-DMCS, Łódź, Poland
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To investigate the feasibility of the continuous wave (cw) upgrade of the European XFEL (E-XFEL) DESY, on-going tests are performed on E-XFEL prototype and production cryomodules since 2011. For these studies, DESY’s Cryo-Module Test Bench (CMTB) has been equipped with a 105 kW cw operating IOT in addition to the 10MW pulsed klystron, making CMTB a very flexible test stand, enabling both cw and pulse operation. For these tests, E-XFEL-like LLRF electronics is used to stabilize amplitude and phase of the voltage Vector Sum (VS) of all 8 cavities of the cryomodule under test. The cryomodule most often tested is the pre-series XM-3, unique since it is housing one fine grain niobium and seven large grain niobium cavities. In autumn 2017, additional spacers were installed on all 8 input couplers to increase the maximum reachable loaded quality factor Ql beyond 2·107. With higher Ql, up to 6·107 for 6 cavities and 2.7·107 for 2 cavities, we have investigated the VS stability and SRF-performance of this cryomodule under various conditions of cooling down rate and operation temperature 1.65K, 1.8K and 2K, at gradients up to ca. 18MV/m. The results of these tests are presented in this paper.
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO029
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About • |
paper received ※ 11 September 2018 paper accepted ※ 20 September 2018 issue date ※ 18 January 2019 |
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