CERN Accelerating science

ATS Reports

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2014-12-19
10:50
Multipactor Mitigation in Coaxial Lines by Means of Permanent Magnets / Gonzalez-Iglesias, D ; Perez, A M ; Anza, S ; Vague, J ; Gimeno, B ; Boria, V E ; Raboso, D ; Vicente, C ; Gil, J ; Caspers, F et al.
The main aim of this paper is the analysis of the feasibility of employing permanent magnets for the multipactor mitigation in a coaxial waveguide. First, the study of a coaxial line immersed in a uniform axial magnetic field shows that multipactor can be suppressed at any RF frequency if the external magnetic field is strong enough. [...]
CERN-ACC-2014-0355.- Geneva : CERN, 2014 - 8 p. - Published in : IEEE Trans. Magn. 61 (2014) "1-8" Fulltext: PDF;

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2014-12-19
10:04
Secondary emission yield at low-primary energies of magnetic materials for anti-multipactor applications / Aguilera, L ; Montero, I ; Olano, L ; Casas, A ; Morales, P ; Vázquez, M ; Galán, L ; Caspers, F ; Costa-Pinto, P ; Taborelli, M et al.
Secondary electron emission processes under electron bombardment are central to many effects at surfaces and interfaces, and to many in vacuum high power RF electronic devices where multipactor can be very intense [1,2]. [...]
CERN-ACC-2014-0354.
- 2014. - 6 p.
Full text

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2014-12-17
14:06
Bake-Out Mobile Controls for Large Vacuum Systems / Blanchard, S (CERN, Switzerland) ; Bellorini, F (CERN, Switzerland) ; Gomes, P (CERN, Switzerland) ; Pereira, H (CERN, Switzerland) ; Kopylov, L (IHEP, Protvino, Russia) ; Merker, S (IHEP, Protvino, Russia) ; Mikheev, M (IHEP, Protvino, Russia)
Large vacuum systems at CERN (Large Hadron Collider - LHC, Low Energy Ion Rings - LEIR...) require bake-out to achieve ultra-high vacuum specifications. The bake-out cycle is used to decrease the outgassing rate of the vacuum vessel and to activate the Non-Evaporable Getter (NEG) thin film [...]
CERN-ACC-2014-0353.- Geneva : CERN, 2014 - 5 p. Fulltext: PDF;
In : 14th International Conference on Accelerator & Large Experimental Physics Control Systems, San Francisco, CA, USA, 6 - 11 Oct 2013, pp.ICALEPS

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2014-12-17
14:03
The Control System of CERN Accelerators Vacuum (LS1 Activities and New Developments) / Gomes, P (CERN, Switzerland) ; Antoniotti, F (CERN, Switzerland) ; Bellorini, F (CERN, Switzerland) ; Blanchard, S (CERN, Switzerland) ; Boivin, JP (CERN, Switzerland) ; Gama, J (CERN, Switzerland) ; Girardot, G (CERN, Switzerland) ; Pigny, G (CERN, Switzerland) ; Rio, B (CERN, Switzerland) ; Vestergard, H (CERN, Switzerland) et al.
After 3 years of operation, the LHC entered its first Long Shutdown period (LS1), in February 2013 [1]. Major consolidation and maintenance works are being performed across the whole CERN’s Accelerator chain, in order to prepare the LHC to restart at higher energy, in 2015. [...]
CERN-ACC-2014-0352.- Geneva : CERN, 2014 - 5 p. Fulltext: PDF;
In : 14th International Conference on Accelerator & Large Experimental Physics Control Systems, San Francisco, CA, USA, 6 - 11 Oct 2013, pp.ICALEPS

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2014-12-17
14:00
Quality Management of CERN Vacuum Controls / Antoniotti, F (CERN, Switzerland) ; Boivin, JP (CERN, Switzerland) ; Fortescue-Beck, E (CERN, Switzerland) ; Gama, J (CERN, Switzerland) ; Gomes, P (CERN, Switzerland) ; Le Roux, P (CERN, Switzerland) ; Pereira, H (CERN, Switzerland) ; Pigny, G (CERN, Switzerland)
The vacuum controls Section (TE-VSC-ICM) is in charge of the monitoring, maintenance and consolidation of the control systems of all accelerators and detectors in CERN; this represents 6 000 instruments distributed along 128 km of vacuum chambers, often of heterogeneous architectures and of diverse technical generations. In order to improve the efficiency of the services provided by ICM, to vacuum experts and to accelerator operators, a Quality Management Plan is being put into place. [...]
CERN-ACC-2014-0351.- Geneva : CERN, 2014 - 5 p. Fulltext: PDF;
In : 14th International Conference on Accelerator & Large Experimental Physics Control Systems, San Francisco, CA, USA, 6 - 11 Oct 2013, pp.ICALEPS

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2014-12-17
13:57
Developments on the SCADA of CERN Accelerators Vacuum / Antoniotti, F (CERN, Switzerland) ; Blanchard, S (CERN, Switzerland) ; Boccioli, M (CERN, Switzerland) ; Gomes, P (CERN, Switzerland) ; Pereira, H (CERN, Switzerland) ; Kopylov, L (IHEP, Protvino, Russia) ; Mikheev, M (IHEP, Protvino, Russia) ; Merker, S (IHEP, Protvino, Russia)
During the first 3 years of LHC operation, the priority for the SCADA (Supervisory Control And Data Acquisition) of vacuum controls was to attend to user requests, and to improve its ergonomics and efficiency: access & presentation of information simplified and normalized; coherent functionalities & menus across all accelerators; automatic scripts instead of fastidious manual actions; enhanced tools for data analysis and for maintenance interventions. Several decades of cumulative developments, based on heterogeneous technologies and architectures, have been asking for a homogenization effort. [...]
CERN-ACC-2014-0350.- Geneva : CERN, 2014 - 5 p. Fulltext: PDF;
In : 14th International Conference on Accelerator & Large Experimental Physics Control Systems, San Francisco, CA, USA, 6 - 11 Oct 2013, pp.ICALEPS

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2014-12-17
13:54
A Fuzzy-Oriented Solution for Automatic Distribution of Limited Resources According to Priority Lists / Pezzetti, M (CERN, Switzerland) ; Inglese, V (CERN, Switzerland) ; Tovar-Gonzalez, A (CERN, Switzerland) ; Coppier, H (ESIEE, Amiens, France) ; Almeida, M (UFMG, Belo Horizonte, Brazil)
This project provides a solution for problems in which there is a limited cryogen resource that supplies several clients in parallel, which can cause the resource’s depletion. This study emerged from the need to solve a specific problem of the Cryogenics Group of the European Organization for Nuclear Research (CERN). [...]
CERN-ACC-2014-0349.- Geneva : CERN, 2014 - 5 p. Fulltext: PDF;
In : 14th International Conference on Accelerator & Large Experimental Physics Control Systems, San Francisco, CA, USA, 6 - 11 Oct 2013, pp.ICALEPS

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2014-12-17
13:51
Validation of the Data Consolidation in Layout Database for the LHC Tunnel Cryogenics Controls Upgrade / Tovar-Gonzalez, A (CERN, Switzerland) ; Balle, C (CERN, Switzerland) ; Blanco, E (CERN, Switzerland) ; Fortescue-Beck, E (CERN, Switzerland) ; Fluder, C (CERN, Switzerland) ; Inglese, V (CERN, Switzerland) ; Pezzetti, M (CERN, Switzerland) ; Gomes, P (CERN, Switzerland) ; Wolak, T (CERN, Switzerland) ; Dudek, M (CERN, Switzerland) et al.
The control system of the Large Hadron Collider cryogenics manages over 34’000 instrumentation and actuator channels. The complete information on their characteristics and parameters can be extracted from a set of views on the Layout database, to generate the specifications of the control system; from these, the code to populate PLCs (Programmable Logic Controller) and SCADA (Supervisory Control & Data Acquisition) is automatically produced, within the UNICOS framework (Unified Industrial Control System). [...]
CERN-ACC-2014-0348.- Geneva : CERN, 2014 - 5 p. Fulltext: PDF;
In : 14th International Conference on Accelerator & Large Experimental Physics Control Systems, San Francisco, CA, USA, 6 - 11 Oct 2013, pp.ICALEPS

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2014-12-17
11:33
Efficient Parametric Identification Method for High Voltage Pulse Transformers / Aguglia, D (CERN, Switzerland) ; Candolfi, S (LEEPCI Lab., Quebec, Canada) ; Viarouge, P (LEEPCI Lab., Quebec, Canada) ; Cros, J (LEEPCI Lab., Quebec, Canada)
This paper presents a new identification method for a pulse transformer equivalent circuit. It is based on an analytical approximation of the frequency-domain impedance data derived from a no-load test with open-circuited secondary winding and only requires measurements of primary current and voltage without phase data. [...]
CERN-ACC-2014-0347.- Geneva : CERN, 2014 - 7 p. Fulltext: PDF;
In : IEEE Pulsed Power and Plasma Science Conference, San Francisco, CA, USA, 16 - 21 Jun 2013, pp.IEEE

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2014-12-17
11:24
Finite Element Based Optimal Design Approach for High Voltage Pulse Transformers / Aguglia, D (CERN, Switzerland) ; Candolfi, S (LEEPCI Lab., Quebec, Canada) ; Viarouge, P (LEEPCI Lab., Quebec, Canada) ; Cros, J (LEEPCI Lab., Quebec, Canada)
This paper presents an optimal design methodology of monolithic high voltage pulse transformers based on the direct 2D FEA identification of the electrical equivalent circuit parameters. This method is applied to the preliminary optimal design of the monolithic high voltage pulse transformer for the future CLIC modulators under study at CERN [...]
CERN-ACC-2014-0346.- Geneva : CERN, 2014 - 7 p. Fulltext: PDF;
In : IEEE Pulsed Power and Plasma Science Conference, San Francisco, CA, USA, 16 - 21 Jun 2013, pp.IEEE

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