CERN Accelerating science

LHC

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2015-01-21
09:15
Development of high $\beta^*$-optics for ALICE / Hermes, Pascal Dominik
This thesis describes a feasibility study for a special optical configuration in Insertion Region 2 (IR2) of the Large Hadron Collider (LHC), which is host of the ALICE detector [...]
CERN-THESIS-2013-370 - 114 p.

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2015-01-20
17:20
Abort Gap Cleaning for LHC Run 2 / Uythoven, J (CERN, Switzerland) ; Boccardi, A (CERN, Switzerland) ; Bravin, E (CERN, Switzerland) ; Goddard, B (CERN, Switzerland) ; Hemelsoet, GH (CERN, Switzerland) ; Höfle, W (CERN, Switzerland) ; Jacquet, D (CERN, Switzerland) ; Kain, V (CERN, Switzerland) ; Mazzoni, S (CERN, Switzerland) ; Meddahi, M (CERN, Switzerland) et al.
To minimise the beam losses at the moment of an LHC beam dump the 3 μs long abort gap should contain as few particles as possible. Its population can be minimised by abort gap cleaning using the LHC transverse damper system. [...]
CERN-ACC-2015-0012.- Geneva : CERN, 2015 - 5 p. Fulltext: PDF;
In : 5th International Particle Accelerator Conference, Dresden, Germany, 15 - 20 Jun 2014, pp.IPAC

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2015-01-20
17:15
Changes to the LHC Beam Dumping System for LHC Run 2 / Uythoven, J (CERN, Switzerland) ; Atanasov, MG (CERN, Switzerland) ; Borburgh, J (CERN, Switzerland) ; Carlier, E (CERN, Switzerland) ; Gabourin, S (CERN, Switzerland) ; Goddard, B (CERN, Switzerland) ; Magnin, N (CERN, Switzerland) ; Senaj, V (CERN, Switzerland) ; Voumard, N (CERN, Switzerland) ; Weterings, W (CERN, Switzerland)
The LHC beam dumping system performed according to expectations during Run 1 of the LHC (2009 – 2013). A brief overview of the experience is given, including a summary of the observed performance by comparison to expectations. [...]
CERN-ACC-2015-0011.- Geneva : CERN, 2015 - 5 p. Fulltext: PDF;
In : 5th International Particle Accelerator Conference, Dresden, Germany, 15 - 20 Jun 2014, pp.IPAC

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2015-01-20
17:10
Upgrades to the LHC Injection and Beam Dumping Systems for the HL-LHC Project / Uythoven, J (CERN, Switzerland) ; Barnes, MJ (CERN, Switzerland) ; Goddard, B (CERN, Switzerland) ; Hrivnak, J (CERN, Switzerland) ; Lechner, A (CERN, Switzerland) ; Maciariello, FL (CERN, Switzerland) ; Mereghetti, A (CERN, Switzerland) ; Perillo Marcone, A (CERN, Switzerland) ; Vittal Shetty, N (CERN, Switzerland) ; Steele, GE (CERN, Switzerland)
The HL-LHC project will push the performance of the LHC injection and beam dumping systems towards new limits. This paper describes the systems affected and presents the new beam parameters for these systems. [...]
CERN-ACC-2015-0010.- Geneva : CERN, 2015 - 3 p. Fulltext: PDF;
In : 5th International Particle Accelerator Conference, Dresden, Germany, 15 - 20 Jun 2014, pp.IPAC

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2015-01-12
09:30
Estimates of photon induced densities in the long straight sections of IR1 and IR5 for v6.0 of the LHC / Malyshev, O B ; Collins, I R
CERN-LHC-VAC-OBM ; VACUUM-TECHNICAL-NOTE-99-14.
- 1999. - 22 p.
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2015-01-07
10:34
The Electrical Resistance of Rutherford-Type Superconducting Cable Splices / Heck, C (CERN, Switzerland) ; Scheuerlein, Chr (CERN, Switzerland) ; Fleiter, J (CERN, Switzerland) ; Bottura, L (CERN, Switzerland)
The electrical resistance of Large Hadron Collider main busbar cable lap splices produced by soft soldering has been measured with two independent methods as a function of intercable contact area and for splices made of cables with various defects. For defect-free lap splices, the resistance increases from 0.3 to 10 nΩ (at 4.3 K in self-field) when reducing the cable overlap length from 120 to 3 mm, as expected assuming that the resistance is inversely proportional to the intercable contact area. [...]
CERN-ACC-2015-0003.- Geneva : CERN, 2015 - 5 p. Fulltext: PDF;
In : Applied Superconductivity Conference 2014, Charlotte, NC, USA, 10 - 15 Aug 2014, pp.ASC 2014

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2015-01-06
08:39
Mobile CT-System for In-situ Inspection in the LHC at CERN / Sauerwein, Christoph (RayScan Technologies GmbH, Meersburg) ; Haemmerle, Volker (RayScan Technologies GmbH, Meersburg) ; Tiseanu, Ion (RayScan Technologies GmbH, Meersburg) ; Williams, Lloyd R (CERN) ; Caspers, Fritz (CERN)
At the European Organisation for Nuclear Research ( CERN) the worlds largest particle accelerator ring, the Large Hadron collider (LHC), is being put into operation. It has been found useful to have a tool for diagnosis of the st ate of components in the interconnection regions of the LHC. [...]
2010 - 10 p. Fulltext: PDF;
In : 10th European Conference on Non-Destructive Testing, Moscow, Russia, 7 - 11 Jun 2010, pp.1_09_13

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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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