Paper |
Title |
Other Keywords |
Page |
MOPCH120 |
Ground Motion Study and the Related Effects on the J-PARC
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ground-motion, simulation, KEK, beam-losses |
327 |
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- S. Takeda, N. Yamamoto, M. Yoshioka
KEK, Ibaraki
- Y. Nakayama
JPOWER, Kanagawa-ken
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The power spectrum density, coherence and cross-spectrum density of the ground motion in the J-PARC site are studied to get the guideline of the beam control systems. J-PARC consists of a 600 MeV linac, a 3 GeV Rapid-cycling synchrotron (RCS) and a 50 GeV synchrotron (MR). MR provides a beam current of 15 micro-A with a period of 3 sec to either the nuclear physics experimental area or the neutrino production target. MR is a very high beam power machine, so its optimum beam loss must be kept fewer than 0.01% of an accelerated beam in order to decrease the radiation damage of accelerator components and to get easy accessibilty to them. From the point of view of beam loss, we give some detailed discussion about the relation between the MR operation and the ground motion using the observed data.
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MOPCH121 |
Ground Motion Measurement at J-PARC
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ground-motion, KEKB, KEK, SLAC |
330 |
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- Y. Nakayama, K. Tada
JPOWER, Kanagawa-ken
- S. Takeda, M. Yoshioka
KEK, Ibaraki
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In the next generation accelerator, construction of the machine on the stable ground is preferable for accelerator beam operation. We have measured ground motion at the J-PARC site under construction, where the ground is very close to the Pacific Ocean. In this paper, some of the observed results are shown, comparing the results of the previous observation at some accelerator facilities and next generation accelerator candidate sites in Japan.
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MOPCH176 |
A Comparison of Large Grain and Fine Grain Cavities Using Thermometry
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superconductivity, cryogenics, superconducting-RF |
475 |
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- G.V. Eremeev, H. Padamsee
Cornell University, Laboratory for Elementary-Particle Physics, Ithaca, New York
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An important limitation for SRF niobium cavities is the high field Q-slope. To investigate this phenomenon we compare the behavior of large grain and fine grain cavities using thermometry. Thermometry allows us to distinguish between different problems which occur in cavities, and to distinguish between different areas showing high field Q-slope. We looked for the difference in heating between grain boundaries and inside grains. We have found interesting differences between the heating of high field slope regions and the heating of point-like defects.
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MOPLS064 |
Measurement of Ground Motion in Various Sites
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ground-motion, DESY, LHC, synchrotron |
691 |
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- W. Bialowons, R. Amirikas, A. Bertolini, D. Kruecker
DESY, Hamburg
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This presentation will be an overview of a study program, initiated in DESY, to measure ground vibration of various sites which can be used for site characterization for the International Linear Collider (ILC) design. Commercial broadband seismometers have been used to measure ground motion, correlation and surface wave velocity. The database of measured ground vibrations is available to the scientific community. A parameterization of the spectra will also be presented.
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TUPCH088 |
High Dynamic Range Beam Profile Measurements
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CTF3, beam-losses, CLIC, injection |
1217 |
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- C.P. Welsch, E. Bravin, B. Burel, T. Lefevre
CERN, Geneva
- T. Chapman, M.J. Pilon
Thermo, Liverpool, New York
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In future high intensity, high energy accelerators, beam loss has to be minimized to maximize performance and minimize activation of accelerator components. It is imperative to have a clear understanding of the mechanisms that can lead to halo formation and to have the possibility to test available theoretical models with an adequate experimental setup. Measurements based on optical transition radiation (OTR) provide an interesting opportunity for high resolution measurements of the transverse beam profile. In order to be applicable for measurements within the beam halo region, it is of utmost importance that a high dynamic range is covered by the image acquisition system. The existing camera system as it is installed in the CLIC Test Facility (CTF3) is compared to a step-by-step measurement with a photo multiplier tube (PMT) and measurements with a cooled charge injection device (CID) camera. The latter acquisition technique provides an innovative and highly flexible approach to high dynamic range measurements and is presented in some detail.
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TUPCH146 |
The Interactions of Surface Damage on RF Cavity Operation
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electron, vacuum, RF-structure, controls |
1361 |
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- J. Norem, A. Hassanein, Z. Insepov
ANL, Argonne, Illinois
- A. Bross, A. Moretti, Z. Qian
Fermilab, Batavia, Illinois
- D. Li, M.S. Zisman
LBNL, Berkeley, California
- R.A. Rimmer
Jefferson Lab, Newport News, Virginia
- D.N. Seidman, K. Yoon
NU, Evanston, Illinois
- Y. Torun
IIT, Chicago, Illinois
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Studies of low frequency RF systems for muon cooling has led to a variety of new techniques for looking at dark currents, a new model of breakdown, and, ultimately, a model of RF cavity operation based on surface damage. We find that cavity behavior is strongly influenced by the spectrum of enhancement factors on field emission sites. Three different spectra are involved: one defining the initial state of the cavity, the second determined by the breakdown events, and the third defining the equilibrium produced as a cavity operates at its maximum field. We have been able to measure these functions and use them to derive a wide variety of cavity parameters: conditioning behavior, material, pulse length, temperature, vacuum, magnetic field, pressure, gas dependence. In addition we can calculate the dependence of breakdown rate on surface field and pulse length. This work correlates with data from Atom Probe Tomography. We will describe this model and new experimental data.
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TUPLS051 |
Development of PEFP 20 MeV Proton Accelerator
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proton, rfq, klystron, ion-source |
1609 |
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- Y.-S. Cho, H.M. Choi, S.-H. Han, I.-S. Hong, J.-H. Jang, H. S. Kim, K.Y. Kim, Y.-H. Kim, H.-J. Kwon, K.T. Seol, Y.-G. Song
KAERI, Daejon
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A 20 MeV proton accelerator has been developed as a low energy part of PEFP (Proton Engineering Frontier Project) 100 MeV accelerator. The 20 MeV accelerator consists of ion source, LEBT (Low Energy Beam Transport), 3 MeV RFQ (Radiofrequency Quadrupole) and 20 MeV DTL (Drift Tube Linac). After the field tuning and high power RF conditioning of the accelerating cavities, the first beam test of the 20 MeV accelerator is underway. During the test, the pulsed proton beam was extracted from the ion source by pulsing the high voltage power supply. Two 1.1 MW, 350MHz RF systems were used to drive the 20 MeV accelerator. The current transformers between DTL tanks and Faraday cup at the end of 20 MeV DTL were used to measure the beam current. In this paper, the development of 20MeV accelerator are summarized and the first beam test results are discussed.
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TUPLS135 |
Technical Infrastructure Monitoring at CERN
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monitoring, CERN, controls, LHC |
1822 |
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- J. Stowisek, T.R. Riesco, A.S. Suwalska
CERN, Geneva
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The Technical Infrastructure Monitoring system (TIM) is used to survey and control CERN's technical services from the CERN Control Centre (CCC). The system's primary function is to provide CCC operators with reliable real-time information about the state of the laboratory's extensive and widely distributed technical infrastructure. TIM is also used to monitor all general services required for the operation of the accelerator complex and the experiments. A flexible data acquisition mechanism allows TIM to interface with a wide range of technically diverse installations, using industry standard protocols wherever possible and custom designed solutions where needed. The complexity of the data processing logic, including persistence, logging, alarm handling, command execution and the evaluation of data-driven business rules is encapsulated in the system's business layer. Users benefit from a suite of advanced graphical applications adapted to operations (synoptic views, alarm consoles, data analysis tools etc.), system maintenance and support. Complementary tools for configuration data management and historical data analysis will be available before the start-up of the LHC in 2007.
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WEPCH051 |
Isochronous Magneto-optical Structure of the Recirculator SALO
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injection, quadrupole, dipole, recirculation |
2035 |
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- I.S. Guk, A. Dovbnya, S.G. Kononenko, F.A. Peev, A.S. Tarasenko
NSC/KIPT, Kharkov
- J.I.M. Botman, M.J. Van der Wiel
TUE, Eindhoven
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With the goal to provide low energy spread of electron beam, the magneto-optical structure of the recirculator SALO has been modified. All of its parts (an injection tract and arcs) were made isochronous and achromatic. Besides, with the purpose of the accelerating structure arrangement, the length of straight sections was enlarged. The amplitude and dispersion functions on various recirculator sections and design characteristics of the beam are submitted.
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WEPCH141 |
Accelerator Physics Code Web Repository
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simulation, electron, CERN, space-charge |
2254 |
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- F. Zimmermann, R. Basset, E. Benedetto, U. Dorda, M. Giovannozzi, Y. Papaphilippou, T. Pieloni, F. Ruggiero, G. Rumolo, F. Schmidt, E. Todesco
CERN, Geneva
- D.T. Abell
Tech-X, Boulder, Colorado
- R. Bartolini
Diamond, Oxfordshire
- O. Boine-Frankenheim, G. Franchetti, I. Hofmann
GSI, Darmstadt
- Y. Cai, M.T.F. Pivi
SLAC, Menlo Park, California
- Y.H. Chin, K. Ohmi, K. Oide
KEK, Ibaraki
- S.M. Cousineau, V.V. Danilov, J.A. Holmes, A.P. Shishlo
ORNL, Oak Ridge, Tennessee
- L. Farvacque
ESRF, Grenoble
- A. Friedman
LLNL, Livermore, California
- M.A. Furman, D.P. Grote, J. Qiang, G.L. Sabbi, P.A. Seidl, J.-L. Vay
LBNL, Berkeley, California
- D. Kaltchev
TRIUMF, Vancouver
- T.C. Katsouleas
USC, Los Angeles, California
- E.-S. Kim
PAL, Pohang, Kyungbuk
- S. Machida
CCLRC/RAL/ASTeC, Chilton, Didcot, Oxon
- J. Payet
CEA, Gif-sur-Yvette
- T. Sen
Fermilab, Batavia, Illinois
- J. Wei
BNL, Upton, Long Island, New York
- B. Zotter
Honorary CERN Staff Member, Grand-Saconnex
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In the framework of the CARE HHH European Network, we have developed a web-based dynamic accelerator-physics code repository. We describe the design, structure and contents of this web repository, illustrate its usage, and discuss our future plans.
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WEPCH156 |
CERN Safety Alarms Monitoring System (CSAM)
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CERN, monitoring, controls, LHC |
2293 |
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- E. Manola-Poggioli, L. Scibile
CERN, Geneva
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The CERN Safety Alarms Monitoring (CSAM) system is designed to aquire and transmit reliably to the CERN Fire Brigade all the alarms generated by a large number of safety alarm equipment distributed around the sites and in the underground. The quality and accuracy of the information provided by CSAM is crucial to permit a quick and efficient intervention by the Fire Brigade. The CSAM projet was launched in 1999 to replace the previous alarm system which used obsolete technology and operator devices. The new system is in operation since 2005 and 2/3 of all alarm equipement on the CERN sites are now handled by the new system. The migration/installation process is is expected to terminate in May 2006. This paper presents the system architecture, the deployment process and the return of experience in the accelerator environment.
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WEPLS010 |
20 - 50 GeV Muon Storage Rings for a Neutrino Factory
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lattice, injection, sextupole, storage-ring |
2415 |
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- G. Rees
CCLRC/RAL/ASTeC, Chilton, Didcot, Oxon
- C. Johnstone
Fermilab, Batavia, Illinois
- F. Meot
CEA, Gif-sur-Yvette
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Muon decay ring studies are being undertaken as part of the International Scoping Study (ISS) for a Neutrino Factory. A racetrack and an isosceles triangle shaped ring are under design, initially for a muon energy of 20 GeV, but with an upgrade potential for 50 GeV. Both rings are designed with long straights to optimize directional muon decay. The neutrinos from the muon decays pass to one or two distant detectors; the racetrack ring has one very long production straight, aligned with one detector, while the triangular ring has two straights, each half as long, which can be aligned with two detectors. Lattice studies, injection, collimation, and RF system design for the large acceptance, high intensity rings are discussed and the performance of the two rings compared.
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WEPLS011 |
General Design Considerations for a High-intensity Muon Storage Ring for a Neutrino Factory
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injection, storage-ring, proton, target |
2418 |
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- C. Johnstone
Fermilab, Batavia, Illinois
- F. Meot
CEA, Gif-sur-Yvette
- G. Rees
CCLRC/RAL/ASTeC, Chilton, Didcot, Oxon
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Muon decay ring design, shielding, and compatibility with potential neutrino detector sites are a critical part of the International Scoping Study (ISS) for a neutrino factory. Two rings are under development: a racetrack and an isosceles-triangle ring initially for muon energy of 20 GeV, but upgradable to 50 GeV. Neutrinos from the muon decays in specially designed production straights can be directed to one or two distant detectors; the racetrack ring has one very long production straight, aligned with one detector, while the triangular ring has two straights, each half as long, aligned with two detectors. An initial site survey of accelerators and distant detectors has been made, along with the required tilt angles from the horizontal will be discussed here. (Lattice studies, injection, collimation, and RF system design are covered in a separate contribution to these proceedings.) Heating and activation effects of beam loss in the chamber walls and components will also be presented.
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THPCH107 |
Upgrade of TRIUMF's 2C STF Control System
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controls, cyclotron, target, isotope-production |
3050 |
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- M. Mouat, I.A. Aguilar, E. Klassen, K.S. Lee, J.J. Pon, T.M. Tateyama, P.J. Yogendran
TRIUMF, Vancouver
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One of TRIUMF's isotope production facilities, the 2C Solid Target Facility (STF), is being upgraded. This installation is located on a primary beamline of TRIUMF's 500 MeV Cyclotron. As a part of this upgrade project, the STF Control System is also being revised. Changes to the STF are meant to enhance reliability and maintainability. The existing STF controls have run very reliably and have provided the required functionality but were implemented in part using different technology to that used for the majority of the cyclotron's Central Control System. The new hardware and software controls should provide a simpler, more easily maintained configuration. Additional goals are to modify the user interface to more closely resemble the interface used for running the 500 MeV Cyclotron, to enhance the event annunciation, and to increase the number of parameters logged.
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THPCH125 |
Inter-laboratory Synchronization for the CNGS Project
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CERN, SPS, extraction, controls |
3092 |
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- J. Serrano, P. Alvarez, J. Lewis
CERN, Geneva
- D. Autiero
IN2P3 IPNL, Villeurbanne
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CERN will start sending a neutrino beam to Gran Sasso National Laboratory in Italy in May 2006. This beam will cover a distance of around 730 km through the crust of the earth from an extraction line in CERN's SPS to dedicated detectors in Gran Sasso. This paper describes the technological choices made to fulfill the specification of inter-laboratory synchronization in the region of 100 ns, as well as some preliminary results. The common time standard is UTC as disseminated by the GPS system, and the techniques are similar to those used by national metrology laboratories for the manufacturing of UTC itself. In addition, real-time messages sent through the Internet allow the detectors in Gran Sasso to go into calibration mode when no beam is being sent. Data concerning the delay and determinism of this international network link is also presented.
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THPCH184 |
Handling and Transport of Oversized Accelerator Components and Physics Detectors
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CERN, LHC, monitoring, acceleration |
3230 |
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- S. Prodon, C. Bertone, M. Guinchard, P. Minginette
CERN, Geneva
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For cost, planning and organisational reasons, it is often decided to install large pre-built accelerators components and physics detectors. As a result, on surface, exceptional transports are required from the construction to the installation sites. Such heavy transports have been numerous during the LHC installation phase. This paper will describe the different types of transport techniques used to fit the particularities of accelerators and detectors components (weight, height, acceleration, planarity) as well as the measurement techniques for monitoring and the logistical aspects (organisation with the police, obstacles on the roads, etc). As far as oversized equipment is concerned, the lowering into the pit is challenging, as well as the transport in tunnel galleries in a very scare space and without handling means attached to the structure like overhead travelling cranes. From the PS accelerator to the LHC, handling systems have been developed at CERN to fit with these particular working conditions. This paper will expose the operating conditions of the main transport equipments used at CERN in PS, SPS and LHC tunnels.
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THPLS027 |
Vibration Measurement at Diamond and the Storage Ring Response
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DIAMOND, storage-ring, ground-motion, synchrotron |
3338 |
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THPLS074 |
Ground Vibration Measurement at NSRRC Site
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storage-ring, background, emittance, simulation |
3454 |
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- D.-J. Wang, H.-P. Chang, J.-R. Chen, J.P. Wang, J. Wang
NSRRC, Hsinchu
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For the future 3GeV TPS project in the NSRRC, ground vibration would be important for this low emittance machine. We have monitored the ground vibration under various experimental conditions at the NSRRC site. Sensors were installed in the bare site, underground 35 meters deep and ground of TLS storage ring, including an electricity shutdown in the NSRRC. From the collected data, we compare the effect about day and night, traffic effect, internal machine vibration propagation. Specific vibration sources and their propagations are also discussed.
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FRYCPA01 |
ITER and International Scientific Collaboration
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plasma, controls, vacuum, diagnostics |
3641 |
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- S. Chiocchio
MPI/IPP, Garching
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The presentation will describe the status and perspectives of the ITER Project. It will also explore the possible connection between the accelerator and the fusion worlds. The talk will cover experience in the managerial and sociological aspects of the worldwide collaboration of which ITER is the end result, very similar to the issues facing the accelerator community, which also faces projects of similar scope from the point of view of time span, technical complexity and sociological impact.
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Transparencies
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