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Accelerators & Technology Sector Notes

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2019-02-19
11:08
Estimated LHC RF system performance reach at injection during Run III and beyond / Timko, Helga (CERN) ; Chapochnikova, Elena (CERN) ; Turaj, Katarzyna (CERN)
This note describes the performance limitations of the present LHC RF system on the injection plateau, in view of increased intensities in Run III and in the HL-LHC era. [...]
CERN-ACC-NOTE-2019-0005. - 2018.
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2019-02-18
14:21
MD#4164: Separatrix folding with octupoles during slow extraction at SPS / Stoel, Linda (Vienna University of Technology (AT)) ; Fraser, Matthew Alexander (CERN) ; Goddard, Brennan (CERN) ; Kain, Verena (CERN) ; Velotti, Francesco Maria (CERN)
The powering of the SPS main octupole circuit (LOF) during third-integer slow extraction was tested to reduce the density of the beam impinging the wires of the electrostatic extraction septum (ZS) [...]
CERN-ACC-NOTE-2019-0004. - 2019.

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2019-02-01
13:50
CERN Injector Complex Availability 2018 / Niemi, Arto (CERN) ; Apollonio, Andrea (CERN) ; Ponce, Laurette (CERN) ; Todd, Benjamin (CERN) ; Walsh, David John (CERN)
This document summarises the injector availability during 2018. [...]
CERN-ACC-NOTE-2019-0003. - 2019. - 25 p.
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2019-01-24
09:52
Staged implementation of low-impedance collimation in IR7: plans for LS2 / Redaelli, Stefano (CERN) ; Antipov, Sergey (CERN) ; Biancacci, Nicolo (CERN) ; Bertarelli, Alessandro (CERN) ; Bruce, Roderik (CERN) ; Carra, Federico (CERN) ; Gobbi, Giorgia (CERN) ; Lechner, Anton (CERN) ; Mereghetti, Alessio (CERN) ; Metral, Elias (CERN)
The HL-LHC upgrade baseline foresees to replace all secondary collimators of IR7 until LS3 in order to ensure a sufficient margin for beam stability with the high-brightness upgraded beams [...]
CERN-ACC-NOTE-2019-0001. - 2019. - 30 p.
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2018-12-20
14:54
High Energy Hadrons Fluence Measurements in the LHC during 2015, 2016 and 2017 Proton Physics Operations. / Martinella, Corinna (University of Jyvaskyla (FI))
In order to reduce the risk of failure for the electronic equipment installed in the underground areas of LHC, every year the Radiation Monitors (RadMons) are used to measure the High Energy Hadrons (HEH) fluence in the tunnel and in the shielded areas. [...]
CERN-ACC-NOTE-2018-0088. - 2018. - 47 p.
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2018-12-20
11:24
HL-LHC impedance and related effects / Amorim, David (Universite Grenoble-Alpes (FR)) ; Antipov, Sergey (CERN) ; Biancacci, Nicolo (CERN) ; Salvant, Benoit (CERN) ; Arpaia, Pasquale (Universita e sezione INFN di Napoli (IT)) ; Barnes, Mike (CERN) ; Bonanno, Edoardo (Universita degli studi di Palermo (IT)) ; Calaga, Rama (CERN) ; Carideo, Emanuela (Universita del Sannio (IT)) ; Day, Hugo Alistair et al.
This note aims at gathering the work done by CERN and collaborators on the HL-LHC beam coupling impedance in the recent years and identifying the next steps [...]
CERN-ACC-NOTE-2018-0087. - 2018. - 93 p.
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2018-12-19
13:52
PERLE: A High Power Energy Recovery Facility for Europe A contribution to the Update of the European Strategy on Particle Physics / Klein, Max (University of Liverpool (GB)) ; Stocchi, Achille (Centre National de la Recherche Scientifique (FR))
The efficient recovery of power, to re-excite cavities from the used beam, was proposed in 1965. [...]
CERN-ACC-NOTE-2018-0086. - 2018.
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2018-12-19
13:45
Exploring the Energy Frontier with Deep Inelastic Scattering at the LHC A Contribution to the Update of the European Strategy on Particle Physics / Bruning, Oliver (CERN) ; Klein, Max (University of Liverpool (GB))
This text is an Addendum to the paper of the same title submitted on the LHeC, and the ERL development facility PERLE, to the European Particle Physics Strategy Update. [...]
CERN-ACC-NOTE-2018-0085. - 2018. - 11 p.
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2018-12-19
11:33
Exploring the Energy Frontier with Deep Inelastic Scattering at the LHC A contribution to the update of the European Strategy on Particle Physics / Bruning, Oliver (CERN) ; Klein, Max (University of Liverpool (GB))
The Large Hadron Collider determines the energy frontier of experimental collider physics for the next two decades. [...]
CERN-ACC-NOTE-2018-0084. - 2018. - 13 p.
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2018-12-17
15:31
MD3344 - Fully-Automatic Angular Alignment of LHC Collimators using Machine Learning / Azzopardi, Gabriella (University of Malta (MT)) ; Valentino, Gianluca (University of Malta (MT)) ; Salvachua Ferrando, Belen Maria (CERN)
A complex collimation system is installed in the LHC to protect its sensitive equipment from unavoidable beam losses. [...]
CERN-ACC-NOTE-2018-0083. - 2018. - 10 p.
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LHC MD Notes (119)