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| FOAA01 |
Automated Diagnosis of Physical Systems
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701 |
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- S. Narasimhan
UARC, Moffet Field
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Automated diagnosis deals with techniques to determine the cause of any abnormal or unexpected behavior of physical systems. The key issue is that inferences have to be made from the limited sensor information available from the system. Some major categories of diagnostic technologies are rule-based systems, case-based reasoning systems, data-drive learning systems, and model-based reasoning systems among others. In this paper we will briefly introduce these categories and then focus on model-based reasoning. We will present the Hybrid Diagnosis Engine (HyDE) developed at the NASA Ames Research Center and its application to real problems.
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Slides
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| FOAA02 |
Timing and LLRF System of Japanese XFEL to Realize Femto-Second Stability
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706 |
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- T. Fukui, N. Hosoda, H. Maesaka, T. Ohshima, T. Shintake
RIKEN, Hyogo
- K. Imai, M. Kourogi
OPtical Comb, Inc., Yokohama
- M. K. Kitamura, K. Tamasaku, Y. Otake
RIKEN Spring-8 Harima, Hyogo
- M. Musya
University of electro-communications, Tokyo
- T. Ohata
JASRI/SPring-8, Hyogo-ken
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At SPring-8, the construction of a 5712-MHz linac and undulators as a light source for XFEL is in progress. There are two parts of the linac in accordance with requirements of phase accuracy to realize a stable SASE generation. One is a crest acceleration part using a sinusoidal wave. The other is an off-crest part that corresponds to a bunch compressor giving an energy chirp to a beam bunch. To generate the stable SASE, the beam energy stability of 10-4 is required. To obtain this stability, the accuracy of sub-picoseconds is required in the crest part, and several ten femto-seconds are necessary in the off-crest part. The requirement in the crest part was achieved by rf control instruments based on an electronic circuit in the SCSS prototype accelerator. However, realizing the several ten femto-seconds accuracy is almost impossible by the present electronic circuit technology. Therefore, for overcoming this fact, we employed laser technology. In this paper, we describe a system based on IQ control technology to obtain sub-picoseconds accuracy and an optical signal distribution system using an optical comb generator that could realize several ten femto-seconds accuracy.
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Slides
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| FOAA03 |
The CERN LHC Central Timing, a Vertical Slice
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711 |
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- P. Alvarez, J. C. Bau, S. Deghaye, I. Kozsar, J. Serrano, J. H. Lewis
CERN, Geneva
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The design of the LHC central timing system depends strongly on the requirements for a Collider-type machine. The accelerators in the LHC injector chain cycle in sequences, each accelerator providing beam to the next as the energy increases. This has led to a timing system in which time is divided into cycles of differing characteristics. The LHC timing requirements are completely different, there are no cycles, and machine events are linked to machine processes such as injection, ramping, squeezing, physics, etc. These processes are modelled as event tables that can be played independently; the system must also provide facilities to send asynchronous events for punctual equipment synchronization and a real-time channel to broadcast machine information such as the beam type and its energy. This paper describes the implementation of the LHC timing system and also gives details on the synchronization in the LHC injector chain that manufactures various beams for LHC.
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Slides
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