CERN Accelerating science

SPS and CNGS

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2022-08-05
06:25
Heat transfer of flow boiling carbon dioxide in vertical upward direction / Schmid, David (CERN ; Ecole Polytechnique, Lausanne) ; Verlaat, Bart (CERN) ; Petagna, Paolo (CERN) ; Revellin, Rémi (INSA, Villeurbanne) ; Schiffmann, Jürg (Ecole Polytechnique, Lausanne)
Heat transfer measurements of flow boiling Carbon Dioxide (CO$_2$) in vertical upward direction have been carried out with a dedicated test facility at the European Organization for Nuclear Research (CERN). The investigation covers saturation temperatures within a range of $-25 \degree \textrm{C} \leq T_{\mathrm{sat}} +5 \degree \textrm{C}$, mass velocities from 100kg m$^{-2}$ s$^{-1}$ $\leq G \leq $ 450 kg m$^{-2}$ s$^{-1}$ and heat fluxes of 5.3 kW m$^{-2}$ and 11.4 kW m$^{-2}$. [...]
2022 - 15 p. - Published in : Int. J. Heat Mass Transf. 196 (2022) 123246 Fulltext: PDF;

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2022-07-26
06:23
AD/ELENA Electron Cooling Experience During and after CERNs Long Shutdown (LS2) / Gamba, Davide (CERN) ; Bojtár, Lajos (CERN) ; Carli, Christian (CERN) ; Dupuy, Bruno (CERN) ; Frassier, Alexandre (CERN) ; Jørgensen, Lars (CERN) ; Ponce, Laurette (CERN) ; Tranquille, Gerard (CERN)
Electron cooling is a key ingredient of the Antimatter Factory at CERN, now composed of the AD and ELENA rings, both featuring an electron cooler. After the successful commissioning of the ELENA ring and electron cooling with antiprotons in 2018, the facility was shut down for the CERN long shutdown (LS2). [...]
2021 - 6 p. - Published in : JACoW COOL 2021 (2021) 36-41 Fulltext: PDF;
In : International Workshop on Beam Cooling and Related Topics (COOL 2021), Novosibirsk, Russian Federation, 1 - 5 Nov 2021, pp.36-41

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2022-07-26
06:23
Study on transient heat transfer at metal to dielectric interfaces in the temperature range between 3.5 K and 30 K / Koettig, T (CERN) ; Golm, J (CERN) ; Liberadzka, J (CERN) ; Borges de Sousa, P (CERN) ; Bremer, J (CERN)
The thermal conductivity and diffusivity across a combination of metallic and insulating layers are important thermodynamic input parameters for cooling studies of composite materials or assemblies built out of layers of different electrical and thermal conductivity. The dynamic response of such thermal contacts across electrically insulating layers can be expressed in terms of a diffusivity-like value, which is giving insight on the interface thermal resistance. [...]
2019 - 5 p. - Published in : IOP Conf. Ser. Mater. Sci. Eng. 502 (2019) 012094 Fulltext: PDF;
In : 27th International Cryogenic Engineering Conference - International Cryogenic Materials Conference 2018, Oxford, United Kingdom, 3 - 7 Sep 2018, pp.012094

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2022-07-26
06:23
Heat transfer at dielectric - metallic interfaces in the ultra-low temperature range / Liberadzka, J (CERN ; Twente U., Enschede) ; Golm, J (CERN) ; Koettig, T (CERN) ; Bremer, J (CERN) ; ter Brake, H J M (Twente U., Enschede)
In the framework of the AEgIS project a series of steady state and dynamic heat transfer measurements at ultra-low temperatures was conducted in the Central Cryogenic Laboratory at CERN. Two sandwich setups, simulating the behaviour of ultra-cold AEgIS electrodes, were investigated and compared, namely: a sapphire − indium − copper and a sapphire − titanium − gold − indium − copper sandwich. [...]
2019 - 5 p. - Published in : IOP Conf. Ser. Mater. Sci. Eng. 502 (2019) 012133 Fulltext: PDF;
In : 27th International Cryogenic Engineering Conference - International Cryogenic Materials Conference 2018, Oxford, United Kingdom, 3 - 7 Sep 2018, pp.012133

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2022-07-26
06:23
Commissioning and performance of the cryogenic system of the new test facility for large superconducting devices at CERN / Derking, J H (CERN) ; Perin, A (CERN) ; Dupont, T (CERN) ; D'Hulster, B (CERN) ; Iakovidis, K (CERN) ; Stewart, L (CERN) ; Barbe, T (CERN) ; Pezzetti, M (CERN)
CERN has built a new test facility for large and heavy superconducting devices that will be first used for testing the Super-FRS magnets of the FAIR project being built at GSI in Germany. This paper reports on the commissioning results and performance of the cryogenic system. [...]
2019 - 5 p. - Published in : IOP Conf. Ser. Mater. Sci. Eng. 502 (2019) 012005 Fulltext: PDF;
In : 27th International Cryogenic Engineering Conference - International Cryogenic Materials Conference 2018, Oxford, United Kingdom, 3 - 7 Sep 2018, pp.012005

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2022-07-26
06:22
Final Acceptance Testing of the CERN SPS Electrostatic Septa / Balhan, B (CERN) ; Barlow, R A (CERN) ; Borburgh, J (CERN) ; Farricker, A (CERN) ; Mo, J A (CERN) ; Prost, A (CERN)
In the framework of the LHC Injector Upgrade (LIU) project, the high field electrostatic septa (so-called ZS) have been upgraded to comply with the new requirements. Prior to their installation in the SPS accelerator in 2020, the septa were tested to verify their final performance. [...]
2021 - 4 p. - Published in : 10.1109/ISDEIV46977.2021.9587034
In : 29th International Symposium on Discharges and Electrical Insulation in Vacuum, Online, 26 - 30 Sep 2021, pp.454-457

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2022-07-26
06:22
Recommissioning of the CERN AD Stochastic Cooling System in 2021 after Long Shutdown 2 / Höfle, Wolfgang (CERN) ; Carli, Christian (CERN) ; Caspers, Fritz (CERN) ; Dupuy, Bruno (CERN) ; Gamba, Davide (CERN) ; Louwerse, Reinier (CERN) ; Myklebust, Vebjorn Roed (CERN) ; Oliveira, Joao Carlos (CERN) ; Ponce, Laurette (CERN) ; Rey, Stephane (CERN) et al.
The power system of the Stochastic Cooling System of the anti-proton decelerator AD at CERN, installed on top of the shielding blocks of the AD ring, was completely dismantled during the long shutdown 2 (LS2) at the end of the 2018 run in order to gain access to the accelerator for magnet consolidation. At start-up, this required finding and verifying the correct delays for all 48 power amplifiers feeding to the two kickers by means of beam transfer functions for the two cooling plateaus at 3.57 GeV/c and 2 GeV/c. [...]
2021 - 6 p. - Published in : JACoW COOL 2021 (2021) 20-25 Fulltext: PDF;
In : International Workshop on Beam Cooling and Related Topics (COOL 2021), Novosibirsk, Russian Federation, 1 - 5 Nov 2021, pp.20-25

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2022-07-26
06:22
Particle radiation effects on shape memory alloy couplers for ultra-high vacuum sealing: a preliminary study / Niccoli, F (CERN) ; Garion, C (CERN) ; Maletta, C (CERN ; U. Calabria, Arcavacata di Rende (main)) ; Cangialosi, C (CERN) ; Infantino, A (CERN) ; Danzeca, S (CERN) ; Chiggiato, P (CERN)
A new shape memory alloy (SMA)-based coupling system for ultra-high vacuum (UHV) applications in particle in accelerators is currently under investigation at the European organization for nuclear research (CERN). The use of such technology in some restricted-access radioactive areas within CERN accelerators could result in noticeable advantages, especially during maintenance operations [...]
2019 - 13 p. - Published in : Smart Mater. Struct. 28 (2019) 085023

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2022-07-26
06:22
Transport and noise properties of YBCO nanowire based nanoSQUIDs / Trabaldo, E (Chalmers U. Tech.) ; Arpaia, R (Chalmers U. Tech. ; Milan Polytechnic) ; Arzeo, M (Chalmers U. Tech. ; CERN) ; Andersson, E (Chalmers U. Tech.) ; Golubev, D (Aalto U.) ; Lombardi, F (Chalmers U. Tech.) ; Bauch, T (Chalmers U. Tech.)
The development of quantum limited magnetic flux sensors has recently gained a lot of attention for the possibility of detecting the magnetic moment of nanoscaled systems. Here, the ultimate goal is the observation of a single spin. [...]
2019 - 18 p. - Published in : Supercond. Sci. Technol. 32 (2019) 073001

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2022-07-25
17:10
Calibration of the secondary emission monitors TBIU and TBID of the North Area targets stations T2, T4, and T6 in TCC2 for slow extracted protons of 400 GeV / Chapman-Hatchett, A ; Cultrut, G ; Dieperink, J ; Fasso, A ; Kalbreier, W ; Muller, A ; Peraire, S ; Thomas, D
SPS-ABT-Int-79-1 ; CERN-SPS-Tech-Note-82-013-ARF ; SPS-ABT-Tech-Note-79-01.
- 1979. - 27 p.
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