CERN Accelerating science

LHC

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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
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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2014-12-16
16:04
Mitigation of Radiation and EMI Effects on the Vacuum Control System of LHC / Pigny, G (CERN, Switzerland) ; Gomes, P (CERN, Switzerland) ; Rio, B (CERN, Switzerland) ; Krakowski, P (AGH, Cracow, Poland)
The 26 km of vacuum chambers where circulates the beam of the Large Hadron Collider (LHC) must be maintained under Ultra High Vacuum (UHV) to minimize the beam interactions with residual gases, and allow the operation of specific systems. The vacuum level is measured by several thousands of gauges along the accelerator. [...]
CERN-ACC-2014-0339.- Geneva : CERN, 2014 - 10 p. Fulltext: PDF;
In : Topical Workshop on Electronics for Particle Physics, Perugia, Italy, 23 - 27 Sep 2013, pp.twepp

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2014-12-16
15:07
Radiation Tolerant Programmable Power Supply for the LHC Beam Screen Heaters / Casas, J (CERN, Switzerland) ; Trikoupis, N (CERN, Switzerland)
For the next LHC run, it is required to install 200W of heating capacity per LHC beam screen heater to regenerate the beam screen by desorption of gas trapped on its walls. In the LHC, there are 272 beam screen heaters and the associated electronics limit presently the heating capacity to 25W. [...]
CERN-ACC-2014-0338.- Geneva : CERN, 2014 - 12 p. Fulltext: PDF;
In : Topical Workshop on Electronics for Particle Physics, Perugia, Italy, 23 - 27 Sep 2013, pp.twepp

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2014-12-15
16:22
LHC Injectors Upgrade Technical Design Report / Coupard, J ; Damerau, H ; Funken, A ; Garoby, R ; Gilardoni, S ; Goddard, B ; Hanke, K ; Lombardi, A ; Manglunki, D ; Meddahi, M et al.
n/a
CERN-ACC-2014-0337.
- 2014. - 616 p.

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2014-12-11
15:11
Does One Need a 4.5 K Screen in Cryostats of Superconducting Accelerator Devices Operating in Superfluid Helium? Lessons from the LHC / Lebrun, Ph ; Parma, V ; Tavian, L
Superfluid helium is increasingly used as a coolant for superconducting devices in particle accelerators: the lower temperature enhances the performance of superconductors in high-field magnets and reduces BCS losses in RF acceleration cavities, while the excellent transport properties of superfluid helium can be put to work in efficient distributed cooling systems. [...]
CERN-ACC-2014-0331.
- 2014. - 8 p.

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2014-12-10
10:27
CMS Trigger strategies for the selection of MSSM Higgs bosons using electron tau-jet decay modes / van der Aa, Olivier
The thesis work concentrated on the developments of selection strategies for the observation of MSSM Higgs bosons in the context of the CMS experiment. [...]
111 p.

DIAL server - Fulltext
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2014-12-05
16:45
Analysis of the Failures and Corrective Actions for the LHC Cryogenics Radiation Tolerant Electronics and its Field Instruments / Balle, Ch ; Casas-Cubillos, J ; Vauthier, N
The LHC cryogenic system radiation tolerant electronics and their associated field instruments have been in nominal conditions since before the commissioning of the first LHC beams in September 2008. [...]
CERN-ACC-2014-0322.
- 2014. - 8 p.
Full text

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2014-12-05
16:15
High Luminosity LHC Project Description / Apollinari, Giorgio (Fermi National Accelerator Laboratory & LARP) ; Brüning, Oliver (CERN) ; Rossi, Lucio (CERN)
The High Luminosity LHC (HL-LHC) is a novel configuration of the Large Hadron Collider, aiming at increasing the luminosity by a factor five or more above the nominal LHC design, to allow increasing the integrated luminosity, in the high luminosity experiments ATLAS and CMS, from the 300 fb-1 of the LHC original design up to 3000 fb-1 or more. [...]
CERN-ACC-2014-0321.
- 2014. - 23 p.
Full text - Full text

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