CERN Accelerating science

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2019-07-24
06:03
Microscopic characterisation of photodetectors used in the hadron calorimeter of the Compact Muon Solenoid experiment / Shukla, R A (Tata Inst.) ; Achanta, V G (Tata Inst.) ; Barbaro, P De (Rochester U.) ; Dugad, S R (Tata Inst.) ; Heering, A (Notre Dame U.) ; Gupta, S K (Tata Inst.) ; Mirza, I (Tata Inst.) ; Prabhu, S S (Tata Inst.) ; Rumerio, P (Alabama U. ; CERN)
The Hybrid Photodetector (HPD) is a hybrid unit with a single accelerating gap between a common photocathode and an array of PIN diodes. Customised HPDs with 19 channels were used to detect scintillation light from hadron calorimeter in the Compact Muon Solenoid (CMS) experiment. [...]
2019 - 12 p. - Published in : Rev. Sci. Instrum. 90 (2019) 023303

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2019-07-24
06:03
Towards Understanding the Origin of Cosmic-Ray Positrons / Aguilar, M (Madrid, CIEMAT) ; Ali Cavasonza, L (IAS, Julich ; JCHP, Julich) ; Ambrosi, G (INFN, Perugia) ; Arruda, L (LIP, Lisbon) ; Attig, N (IAS, Julich ; JCHP, Julich) ; Azzarello, P (Geneva U.) ; Bachlechner, A (IAS, Julich ; JCHP, Julich) ; Barao, F (LIP, Lisbon) ; Barrau, A (LPSC, Grenoble) ; Barrin, L (CERN) et al. /AMS
Precision measurements of cosmic ray positrons are presented up to 1 TeV based on 1.9 million positrons collected by the Alpha Magnetic Spectrometer on the International Space Station. The positron flux exhibits complex energy dependence. [...]
2019 - 9 p. - Published in : Phys. Rev. Lett. 122 (2019) 041102 Fulltext from Publisher: PDF;

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2019-07-24
06:03
Status of the GBAR experiment at CERN / Mansoulié, Bruno (IRFU, Saclay) /GBAR
The GBAR experiment aims at measuring the free-fall of antihydrogen atoms. It is located at CERN in the AD area and will be connected to the new ELENA low-energy antiproton ring. [...]
2019 - 6 p. - Published in : Hyperfine Interact. 240 (2019) 11

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2019-07-24
06:03
Stellar and thermal neutron capture cross section of $^9$Be / Wallner, A (Vienna U. ; Australian Natl. U., Canberra (main)) ; Bichler, M (Vienna, Tech. U., Atominst.) ; Coquard, L (KIT, Karlsruhe) ; Dillmann, I (KIT, Karlsruhe) ; Forstner, O (U. Vienna (main)) ; Golser, R (U. Vienna (main)) ; Heil, M (KIT, Karlsruhe) ; Käppeler, F (KIT, Karlsruhe) ; Kutschera, W (U. Vienna (main)) ; Lederer-Woods, C (Edinburgh U.) et al.
The neutron capture cross section of Be9 for stellar energies was measured via the activation technique using the Karlsruhe Van de Graaff accelerator in combination with accelerator mass spectrometry at the Vienna Environmental Research Accelerator. To characterize the energy region of interest for astrophysical applications, activations were performed in a quasistellar neutron spectrum of kT=25 keV and for a spectrum at En=473±53 keV. [...]
2019 - 11 p. - Published in : Phys. Rev. C 99 (2019) 015804 Fulltext: PDF;

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2019-07-24
06:03
Simulation of hydrodynamic tunneling induced by high-energy proton beam in copper by coupling computer codes / Nie, Y (CERN) ; Fichera, C (CERN) ; Mettler, L (CERN) ; Carra, F (CERN) ; Schmidt, R (CERN) ; Tahir, N A (Darmstadt, GSI) ; Bertarelli, A (CERN) ; Wollmann, D (CERN)
The design of machine protection systems for high-energy accelerators with high-intensity beams requires analyzing a large number of failures leading to beam loss. One of the most serious failures is an accidental impact of a large number of bunches at one location, for example, due to a deflection of the particle beams by the extraction kicker magnets with the wrong strength. [...]
2019 - 16 p. - Published in : Phys. Rev. Accel. Beams 22 (2019) 014501 Fulltext from Publisher: PDF;

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2019-07-24
06:03
Experiment exposing refractory metals to impacts of 440 GeV$/c$ proton beams for the future design of the CERN antiproton production target: Experiment design and online results / Torregrosa Martin, Claudio (CERN ; Valencia, Polytechnic U.) ; Perillo-Marcone, Antonio (CERN) ; Calviani, Marco (CERN) ; Gentini, Luca (CERN) ; Butcher, Mark (CERN) ; Muñoz-Cobo, José-Luis (Valencia, Polytechnic U.)
The HRMT27-RodTarg experiment employed the HiRadMat facility at CERN to impact intense 440 GeV proton beams onto thin rods 8 mm in diameter, 140 mm in length, and made of high-density materials such as Ir, W, Ta, Mo, and alloys. The purpose of the experiment was to reduce uncertainties on the CERN antiproton target material response and assess the material selection for its future redesign. [...]
2019 - 16 p. - Published in : Phys. Rev. Accel. Beams 22 (2019) 013401 Fulltext from Publisher: PDF;

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2019-07-24
06:03
Measurement of $^4$He charge- and mass-changing cross sections on H, C, O, and Si targets in the energy range 70–220 MeV/u for radiation transport calculations in ion-beam therapy / Horst, Felix (Giessen U. ; Darmstadt, GSI) ; Aricò, Giulia (CERN) ; Brinkmann, Kai-Thomas (U. Giessen, II. Phys. Inst.) ; Brons, Stephan (Heidelberg U.) ; Ferrari, Alfredo (CERN) ; Haberer, Thomas (Heidelberg U.) ; Mairani, Andrea (Heidelberg U. ; CNAO, Pavia) ; Parodi, Katia (Munich U.) ; Reidel, Claire-Anne (Darmstadt, GSI ; Strasbourg, IPHC) ; Weber, Uli (Darmstadt, GSI) et al.
Measured charge- and mass-changing cross sections for the systems He4+C12, He4+O16, He4+Si28, and He4+H1 in the energy range 70–220MeV/u are presented. The cross sections were obtained via the attenuation method where a ΔE-E scintillator telescope was used for particle identification. [...]
2019 - 11 p. - Published in : Phys. Rev. C 99 (2019) 014603 Fulltext from publisher: PDF;

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2019-07-24
06:03
Radiological clearance of equipment from high-energy electron accelerators: The example of LEP superconducting acceleration system / Duchemin, Charlotte (CERN) ; Magistris, Matteo (CERN) ; Pozzi, Fabio (CERN) ; Silari, Marco (CERN) ; Theis, Chris (CERN) ; Vincke, Helmut (CERN)
The lifespan of a particle accelerator includes its final decommissioning and the disposal of potentially activated materials, one of the major challenges faced at accelerator laboratories. This paper discusses the computational and experimental techniques adopted for clearing from regulatory control the superconducting acceleration system of the former CERN Large Electron Positron collider (LEP), consisting of nearly 450 tons of valuable metals. [...]
2019 - 14 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 919 (2019) 42-55

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2019-07-24
06:03
Beam halo collimation studies and measurements at the Accelerator Test Facility ATF2 / Fuster-Martínez, N (CERN) ; Bambade, P (Orsay, LAL) ; Faus-Golfe, A (Orsay, LAL) ; Kubo, K (KEK, Tsukuba ; Sokendai, Tsukuba) ; Liu, S (DESY) ; Okugi, T (KEK, Tsukuba ; Sokendai, Tsukuba) ; Tauchi, T (KEK, Tsukuba ; Sokendai, Tsukuba) ; Terunuma, N (KEK, Tsukuba ; Sokendai, Tsukuba) ; Wallon, S (Orsay, LAL) ; Yang, R (Orsay, LAL)
A beam halo collimator was installed at the Accelerator Test Facility ATF2 in the spring of 2016. The main objective of the collimator is the reduction of background photons that limit the performance of key diagnostic devices around the Interaction Point, especially the Shintake Monitor, used for measuring the nanometer level vertical beam sizes, and the vertical and horizontal Diamond Sensors, used for transverse beam halo measurements. [...]
2019 - 12 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 917 (2019) 31-42

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2019-07-24
06:03
Single-photon laser spectroscopy of cold antiprotonic helium / Hori, Masaki (Munich, Max Planck Inst. Quantenopt.)
Some laser spectroscopy experiments carried out by the Atomic Spectroscopy and Collisions Using Slow Antiprotons (ASACUSA) collaboration to measure the single-photon transition frequencies of antiprotonic helium ( $\overline {p}\text {He}^{+}\equiv \overline {p}+\text {He}^{2+}+e^{-}$ ) atoms are reviewed. The $\overline {p}\text {He}^{+}$ were cooled to temperature T = 1.5–1.7 K by buffer-gas cooling in a cryogenic gas target, thus reducing the thermal Doppler width in the single-photon resonance lines. [...]
2018 - 8 p. - Published in : Hyperfine Interact. 239 (2018) 44 Fulltext: PDF;
In : 13th International Conference on Low Energy Antiproton Physics, Paris, France, 12 - 16 Mar 2018, pp.44

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