CERN, Geneva, Switzerland
CERN, Geneva, Switzerland
*http://hadoop.apache.org/
CERN, Geneva, Switzerland
J-PARC, KEK & JAEA, Ibaraki-ken, Japan
LBNL, Berkeley, California, USA
| Paper | Title | Other Keywords | Page |
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| MOMIB06 | Personnel Protection of the CERN SPS North Hall in Fixed Target Primary Ion Mode | ion, proton, PLC, target | 66 |
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| While CERN's Super Proton Synchrotron (SPS) is able to deliver both secondary proton and primary ion beams to fixed targets in the North Area, the experimental areas (North Hall) are widely accessible during beam. In ion mode all normal safety elements involved in producing secondary beams are removed, so that an accidental extraction of a high-intensity proton beam into the North Hall would expose personnel present there to a radiation hazard. This has required an injector reconfiguration restricting operation to either ions or protons. However, demands for operational flexibility of CERN accelerators have led to a need to mix within the same SPS super-cycle both high-intensity proton cycles for LHC or HiRadMat and ion cycles for the North Area. We present an active interlock designed to mitigate this hazard: Beam Current Transformers are used to measure the level of beam intensity, and if above a set threshold, pulsing of the extraction septa is vetoed. The safety function is implemented by means of two logically equivalent but diverse and separate interlock chains. This interlock is expected to be in place once the SPS resumes operation after the first Long Shutdown in 2014. | |||
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Slides MOMIB06 [0.236 MB] | ||
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Poster MOMIB06 [4.250 MB] | ||
| TUPPC026 | Concept and Prototype for a Distributed Analysis Framework for the LHC Machine Data | framework, operation, embedded, database | 604 |
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The Large Hadron Collider (LHC) at CERN produces more than 50 TB of diagnostic data every year, shared between normal running periods as well as commissioning periods. The data is collected in different systems, like the LHC Post Mortem System (PM), the LHC Logging Database and different file catalogues. To analyse and correlate data from these systems it is necessary to extract data to a local workspace and to use scripts to obtain and correlate the required information. Since the amount of data can be huge (depending on the task to be achieved) this approach can be very inefficient. To cope with this problem, a new project was launched to bring the analysis closer to the data itself. This paper describes the concepts and the implementation of the first prototype of an extensible framework, which will allow integrating all the existing data sources as well as future extensions, like hadoop* clusters or other parallelization frameworks.
*http://hadoop.apache.org/ |
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Poster TUPPC026 [1.378 MB] | ||
| TUPPC028 | The CERN Accelerator Logging Service - 10 Years in Operation: A Look at the Past, Present, and Future | database, operation, controls, instrumentation | 612 |
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| During the 10 years since it's first operational use, the scope and scale of the CERN Accelerator Logging Service (LS) has evolved significantly: from an LHC specific service expected to store 1TB / year; to a CERN-wide service spanning the complete accelerator complex (including related sub-systems and experiments) currently storing more than 50 TB / year on-line for some 1 million signals. Despite the massive increase over initial expectations the LS remains reliable, and highly usable - this can be attested to by the 5 million daily / average number of data extraction requests, from close to 1000 users. Although a highly successful service, demands on the LS are expected to increase significantly as CERN prepares LHC for running at top energy, which is likely to result in at least doubling current data volumes. Furthermore, focus is now shifting firmly towards a need to perform complex analysis on logged data, which in-turn presents new challenges. This paper reflects on 10 years as an operational service, in terms of how it has managed to scale to meet growing demands, what has worked well, and lessons learned. On-going developments, and future evolution will also be discussed. | |||
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Poster TUPPC028 [3.130 MB] | ||
| THPPC034 | A Novel Analysis of Time Evolving Betatron Tune | betatron, injection, experiment, operation | 1157 |
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| J-PARC Main Ring (MR) is a high-intensity proton synchrotron and since 2009 delivering beam to the T2K neutrino experiment and hadron experiments. It is essential to measure time variation of betatron tune accurately throughout from beam injection at 3 GeV to extraction at 30 GeV. The tune measurement system of J-PARC MR consist of a stripline-kicker, beam position monitors, and a waveform digitizer. Betatron tune appears as sidebands of harmonics of revolution frequency in the turn-by-turn beam position spectrum. Excellent accuracy of measurement and high immunity against noise were achieved by exploiting a wide-band spectrum covering multiple harmonics. | |||
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Poster THPPC034 [0.707 MB] | ||
| THPPC110 | Timing of the ALS Booster Injection and Extraction | booster, timing, injection, storage-ring | 1318 |
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| The Advanced Light Source (ALS) timing system upgrade introduces a complete replacement of both the hardware and the technology used to drive the timing of the accelerator. The implementation of a new strategy for the booster injection and extraction mechanisms is conceptually similar to the one in place today, but fundamentally different due to the replacement of the technology. Here we describe some of the building blocks of this new implementation as well as an example of how the system can be configured to provide timing for injection and extraction of the ALS booster. | |||
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Poster THPPC110 [0.207 MB] | ||