Journal ArticleDOI
Fully Digital and White Rabbit-Synchronized Low-Level RF System for LIPAc
C. de la Morena,M. Weber,David Regidor,Purificación Méndez,I. Kirpitchev,Joaquin Molla,Angel Ibarra,M. Mendez,B. Rat,J. G. Ramirez,R. Rodriguez,Javier Diaz +11 more
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TLDR
The LIPAc LLRF system is the first LLRF based on WR, and it has been designed and fabricated using the most advanced technology, as all the signal processing is performed in the digital domain.Abstract:
The International Fusion Materials Irradiation Facility (IFMIF) is an international project to study and qualify candidate materials for the construction of a future fusion reactor. One of the objectives of the IFMIF-Engineering Validation and Engineering Design Activity Project is to build a linear prototype accelerator (LIPAc) to validate the final IFMIF accelerator concept. LIPAc, which is currently under construction in Rokkasho (Japan), will generate a 9-MeV deuteron beam of 125-mA current with 100% duty cycle. CIEMAT (Spain) is in charge of providing the RF power system, including the low-level radio frequency (LLRF) system. Most of the developed LLRF systems are not completely digital, as they use analog front ends for intermediate frequency conversion before or after digitalization. However, the LIPAc LLRF system is a fully digital system: no analog frequency conversion is performed, the radio frequency (RF) signals are directly digitally synthesized and sampled by means of high-speed digital-to-analog converters and analog-to-digital converters. This is a clear advantage in terms of flexibility, reliability, reconfigurability, cost, and response time, as all the signal processing is performed in the digital domain. The other main advantages and novelties are the use of White Rabbit (WR) for timing synchronization and master oscillator distribution (distributed RF over WR). The LIPAc LLRF system is the first LLRF based on WR, and it has been designed and fabricated using the most advanced technology. This paper presents the detailed description of the LIPAc LLRF system and its advantages, performance evaluation, and verification.read more
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Journal ArticleDOI
IEEE 1588 High Accuracy Default Profile: Applications and Challenges
Francisco Girela-Lopez,Jose Lopez-Jimenez,Miguel Jimenez-Lopez,Rafael L. Rodríguez,Eduardo Ros,Javier Diaz +5 more
TL;DR: The pre-standard protocol is revised to expose the challenges that the High Accuracy profile will find after its release and covers existing applications, promising deployments and the technological roadmap, providing hints and an overview of features to be studied.
Journal ArticleDOI
A Fully Programmable White-Rabbit Node for the SKA Telescope PPS Distribution System
Miguel Jimenez-Lopez,Felipe Torres-Gonzalez,Jose Luis Gutierrez-Rivas,Manuel Rodríguez-Álvarez,Javier Diaz +4 more
TL;DR: The authors propose the WR zynq embedded node (WR-ZEN) platform as a candidate for the SKA’s pulse per second (PPS) distribution system, a new design that integrates the WR technology, thus enabling the subnanosecond accuracy.
Journal ArticleDOI
Picoseconds-Accurate Fiber-Optic Time Transfer With Relative Stabilization of Lasers Wavelengths
TL;DR: In this paper, the authors proposed a scheme where the difference (offset) of the wavelengths of forward and backward lasers is stabilized and where optical interleavers are used as diplexers.
Journal ArticleDOI
Validation of the Linear IFMIF Prototype Accelerator (LIPAc) in Rokkasho
Keitaro Kondo,Tomoya Akagi,F. Arranz,Nicolas Bazin,Luca Bellan,Benoit Bolzon,Beatriz Brañas,Philippe Cara,Yann Carin,Jesus Castellanos,S. Chel,Michele Comunian,Hervé Dzitko,Takashi Ebisawa,A. Facco,Enrico Fagotti,Daniel Gavela,Dominique Gex,Francesco Grespan,R. Heidinger,Yosuke Hirata,David Jimenez,Antti Jokinen,Atsushi Kasugai,Juan Knaster,Kohki Kumagai,Saerom Kwon,Sunao Maebara,Alvaro Marchena,Alvaro Marqueta,Jacques Marroncle,Purificación Méndez,Joaquin Molla,Ivan Moya,Oriol Nomen,A. Palmieri,Guy Phillips,Andrea Pisent,Ivan Podadera,Giuseppe Pruneri,David Regidor,Angel Rodriguez,Keishi Sakamoto,Francesco Scantamburlo,Yoshito Shimosaki,Takahiro Shinya,Masayoshi Sugimoto,Rodrigo Varela,M. Weber +48 more
TL;DR: In this article, the linear IFMIF Prototype Accelerator (LIPAc) has been constructed at Rokkasho, Japan under the Broader Approach Agreement (BOA) for material tests for fusion power plants.
Journal ArticleDOI
10 Gigabit White Rabbit: Sub-Nanosecond Timing and Data Distribution
Miguel Jimenez-Lopez,Francisco Girela-Lopez,Jose Lopez-Jimenez,Emilio Marin-Lopez,Rafael L. Rodríguez,Javier Diaz +5 more
TL;DR: This contribution presents for the first time in the literature a new WR system which allows high bandwidth data exchange in 10 GbE networks while providing sub-nanosecond accuracy synchronization.
References
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TL;DR: The issues and tradeoffs in the design and monolithic implementation of direct-conversion receivers are described and circuit techniques that can alleviate the drawbacks of this architecture are proposed.
Journal ArticleDOI
IFMIF; Overview of the validation activities
Juan Knaster,Frederik Arbeiter,Philippe Cara,P. Favuzza,Tomohiro Furukawa,F. Groeschel,R. Heidinger,Angel Ibarra,H. Matsumoto,A. Mosnier,Hisashi Serizawa,Masayoshi Sugimoto,H. Suzuki,Eiichi Wakai +13 more
TL;DR: The Engineering Validation and Engineering Design Activities (EVEDA) for the International Fusion Materials Irradiation Facility (IFMIF), an international collaboration under the Broader Approach Agreement between Japan Government and EURATOM, aims at allowing a rapid construction phase of IFMIF in due time with an understanding of the cost involved.
The Linear IFMIF Prototype Accelerator (LIPAC) Design Development under the European-Japanese Collaboration
Philippe Cara,Nicolas Bazin,Beatriz Brañas Lasala,S. Chel,A. Facco,Enrico Fagotti,Raphael Gobin,R. Heidinger,D. Jiménez-Rey,Atsushi Kasugai,Sakamoto Keishi,Juan Knaster,Alvaro Marqueta,Jacques Marroncle,Joaquin Molla,Purificación Méndez,S. Ohira,Yoshikazu Okumura,Andrea Pisent,Ivan Podadera,Bertrand Renard,Keishi Sakamoto +21 more
Abstract: The IFMIF aims to provide an accelerator-based, D-Li neutron source to produce high energy neutrons at sufficient intensity. Part of the BA agreement (Japan-EURATOM), the goal of the IFMIF/EVEDA project is to work on the engineering design of IFMIF and to validate the main technological challenges which includes a 125mA CW D⁺ accelerator up to 9 MeV mainly designed and manufactured in Europe. The components are in an advanced stage of manufacturing. The first components which allow the production of a 140 mA-100 keV deuteron beam have been delivered, installed and under commissioning at Rokkasho. The second phase (100 keV to 5 MeV) will end by March 2017. The third phase (short pulse) and forth phase (cw) will be the integrated commissioning of the LIPAc up to 9 MeV. The duration of the project has been recently extended up to end 2019 to allow the commissioning and operation of the whole accelerator (1MW). The aim of this paper is to give an overview of the LIPAc, currently under commissioning in Japan, to outline the engineering design and the development of the key components, as well as the expected outcomes of the engineering work, associated with the experimental program.
The LHC low level RF
Philippe Baudrenghien,G Hagmann,John Molendijk,R. Olsen,A. Rohlev,V. Rossi,D. Stellfeld,Daniel Valuch,U. Wehrle +8 more
TL;DR: Baudrenghien et al. as mentioned in this paper presented the expected performances, summarized the algorithms and the implementation of the LHC low-level RF, and compared the expected performance with a full-scale test set-up including klystron and cavity.
Proceedings ArticleDOI
Overview of the Spallation Neutron Source Linac Low-Level RF Control System
TL;DR: The design and production of the Spallation Neutron Source Linac Low-Level RF control system is complete, and installation will be finished in Spring 2005 as discussed by the authors, and the most extensive test to date of the LLRF control system, with fourteen (of an eventual 96) systems operating simultaneously.