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2019-09-14
06:30
KlyC: 1.5-D large-signal simulation code for klystrons / Cai, Jinchi (CERN) ; Syratchev, Igor (CERN)
The High Efficiency International Klystron Activity (HEIKA) was initiated at CERN in 2014 to evaluate and develop new klystron bunching technologies for high-efficiency klystrons in application to the large-scale scientific projects such as the Compact Linear Collider (CLIC) and the Future Circular Collider (FCC). The success of such development strongly depends on the availability of the specialized klystron computer codes. [...]
2019 - 8 p. - Published in : IEEE Trans. Plasma Sci. 47 (2019) 1734-1741

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2019-09-14
06:30
An upgraded luminosity leveling procedure for the ALICE Experiment / de Cataldo, Giacinto (INFN, Bari ; CERN) ; Valentino, Gianluca (CERN ; U. Malta) ; Franco, Antonio (INFN, Bari ; CERN) ; Alemany, Reyes (CERN) ; Follin, Fabio (CERN) ; Hostettler, Michi (CERN ; U. Bern (main)) ; Wenninger, Jorg (CERN)
The Large Hadron Collider (LHC) Interface project (LHC_IF) ensures that the A Large Ion Collider Experiment (ALICE) can operate congruently and safely with the LHC in different machine configurations and beam modes. Measurements in proton–proton (pp) collisions are vital for ALICE and serve as a reference to calibrate the Pb ion–Pb ion (Pb–Pb) measurements. [...]
2019 - 8 p. - Published in : IEEE Trans. Nucl. Sci. 66 (2019) 763-770

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2019-09-13
06:01
Small REBCO isotropic round wire (STAR): an important step from performant material to practical conductor in high field HTS magnets / Rossi, Lucio (CERN)
2019. - 3 p.
Fulltext

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2019-09-13
06:01
Conceptual design of a high-field septum magnet using a superconducting shield and a canted-cosine-theta magnet / Barna, Dániel (Wigner RCP, Budapest) ; Novák, Martin (Wigner RCP, Budapest) ; Brunner, Kristóf (CERN) ; Kirby, Glyn (CERN) ; Goddard, Brennan (CERN) ; Borburgh, Jan (CERN) ; Atanasov, Miroslav Georgiev (CERN) ; Sanz Ull, Alejandro (CERN) ; Renner, Elisabeth (CERN) ; Bartmann, Wolfgang (CERN) et al.
A zero-field cooled superconducting shield was previously proposed to realize a high-field (at least 3 T) septum magnet for the Future Circular Collider proton-proton ring. In this paper, we present the conceptual design of a complete septum magnet prototype including a shield with an optimized shape and a simple and cost-effective superconducting magnet using the canted cosine theta concept. [...]
2019 - 7 p. - Published in : Rev. Sci. Instrum. 90 (2019) 053302

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2019-09-13
06:00
rf design studies on the 750 MHz radio frequency quadrupole linac for proton-induced x-ray emission analysis / Pommerenke, Hermann Winrich (CERN ; U. Rostock) ; Bencini, Vittorio (CERN) ; Grudiev, Alexej (CERN) ; Lombardi, Alessandra Maria (CERN) ; Mathot, Serge (CERN) ; Montesinos, Eric (CERN) ; Timmins, Marc (CERN) ; van Rienen, Ursula (U. Rostock) ; Vretenar, Maurizio (CERN)
The proton-induced x-ray emission (PIXE) is the most commonly used ion beam analysis technique. It allows for nondestructive quantitative elemental characterization and is used in a variety of fields, particularly for the diagnosis of cultural heritage artwork. [...]
2019 - 12 p. - Published in : Phys. Rev. Accel. Beams 22 (2019) 052003 Fulltext from Publisher: PDF;

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2019-09-13
06:00
Thermal study of the ironless inductive position sensors installed on the LHC collimators / Grima, Adrian (U. Malta ; CERN) ; Di Castro, Mario (CERN) ; Masi, Alessandro (CERN) ; Sammut, Nicholas (Malta U. ; CERN)
The safe operation of the European Organization for Nuclear Research Large Hadron Collider relies on a complex system for equipment protection. An essential part of machine protection is the collimation system since it is used to protect the equipment from beam losses. [...]
2019 - 8 p. - Published in : IEEE Trans. Nucl. Sci. 66 (2019) 688-695

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2019-09-12
09:23
The 16 T dipole development program for FCC and HE-LHC / Schoerling, Daniel (CERN) ; Arbelaez, Diego (LBNL, Berkeley) ; Auchmann, Bernhard (PSI, Villigen) ; Bajko, Marta (CERN) ; Ballarino, Amalia (CERN) ; Barzi, Emanuela (Fermilab) ; Bellomo, Giovanni (INFN, Milan) ; Benedikt, Michael (CERN) ; Izquierdo Bermudez, Susana (CERN) ; Bordini, Bernardo (CERN) et al.
A future circular collider (FCC) with a center-of-mass energy of 100 TeV and a circumference of around 100 km, or an energy upgrade of the LHC (HE-LHC) to 27 TeV require bending magnets providing 16 T in a 50-mm aperture. Several development programs for these magnets, based on Nb$_3$Sn technology, are being pursued in Europe and in the U.S. [...]
FERMILAB-PUB-19-400-TD.- 2019 - 9 p. - Published in : IEEE Trans. Appl. Supercond. 29 (2019) 4003109

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2019-09-12
09:23
Ferrimagnetic resonance field sensors for particle accelerators / Beaumont, Anthony (CERN ; Ecole Polytechnique, Lausanne) ; Buzio, Marco (CERN) ; Boero, Giovanni (Ecole Polytechnique, Lausanne)
We report on two ferrimagnetic resonance (FMR) sensors for absolute dynamic magnetic field measurements at 36 and 100 mT. The sensors are designed to mark precisely and reproducibly the moment when a time-transient magnetic field attains a specific value. [...]
2019 - 9 p. - Published in : Rev. Sci. Instrum. 90 (2019) 065005

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2019-09-12
09:23
Advances in the study of HTS superconductors for the beam impedance mitigation in CERN-FCC: the thermal runaway problem / Vaglio, Ruggero (CNR-SPIN, Naples ; INFN, Naples) ; Calatroni, Sergio (CERN)
In CERN Future Circular Collider (FCC-hh), a possible next-generation high-energy hadron–hadron collider, the center-of-mass collision energy will be of 100 TeV, with opposite proton beams of 50 TeV steered in a 100-km circumference tunnel by 16 T superconducting magnets. The synchrotron radiation, emitted by the beams, is absorbed by a beam-facing screen held at 50 K. [...]
2019 - 6 p. - Published in : Eur. Phys. J. Spec. Top. 228 (2019) 749-754

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2019-09-12
09:23
Cryogenic surface resistance of copper: Investigation of the impact of surface treatments for secondary electron yield reduction / Calatroni, Sergio (CERN) ; Arzeo, Marco (CERN) ; Aull, Sarah (CERN) ; Himmerlich, Marcel (CERN) ; Costa Pinto, Pedro (CERN) ; Vollenberg, Wilhelmus (CERN) ; Di Girolamo, Beniamino (CERN) ; Cruikshank, Paul (CERN) ; Chiggiato, Paolo (CERN) ; Bajek, David (U. Dundee) et al.
The surface resistance of copper samples with an amorphous carbon (a-C) coating or with laser surface structuring, the surface treatments of choice for electron cloud suppression in critical cryogenic sectors of the high-luminosity upgrade of the Large Hadron Collider (HL-LHC), has been measured for the first time at a cryogenic temperature using the quadrupole resonator at CERN. Three different frequencies of relevance for evaluating beam impedance effects, namely, 400, 800, and 1200 MHz, have been investigated. [...]
2019 - 9 p. - Published in : Phys. Rev. Accel. Beams 22 (2019) 063101 Fulltext from Publisher: PDF;

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