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Accelerators & Technology Sector Notes

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2020-05-28
16:03
I/Q Model of the SPS 200 MHz Travelling Wave Cavity and Feedforward Design / Baudrenghien, Philippe (CERN) ; Mastoridis, Themistoklis (California Polytechnic State Univ. (US))
As part of the LHC injector upgrade project (LIU), that calls for the doubling of the bunch intensity injected from the SPS into the LHC, the SPS Low Level RF (LLRF) is fully upgraded during the LHC Long-Shutdown 2 (LS2) [...]
CERN-ACC-NOTE-2020-0032. - 2020. - 22 p.
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2020-05-18
12:47
RF multipoles deliverable / Cruz Alaniz, Emilia (University of Liverpool (GB)) ; Papaphilippou, Yannis (CERN) ; Welsch, Carsten Peter (University of Liverpool (GB))
The crab cavities to be installed in the High-Luminosity LHC (HL-LHC) aim to provide an increase in luminosity by restoring head-on collisions and therefore reducing the loss of luminosity due to the crossing angle. [...]
CERN-ACC-NOTE-2020-0031. - 2020. - 17 p.

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2020-05-18
12:34
Summary of the 2019 ICAF, LIU & ARIES Space Charge Workshop at CERN / Schmidt, Frank (CERN) ; Papaphilippou, Yannis (CERN)
Following the success of the previous Space Charge Workshop at CERN in 2013, in Oxford in 2015 and in Darmstadt in 2017, CERN has hosted the 4th workshop in this series from the 4th - 6th November 2019, and it has been held under the auspices of ICFA, LIU and ARIES [...]
CERN-ACC-NOTE-2020-0030. - 2020. - 8 p.
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2020-05-14
10:09
A Mathematica Notebook for the calculation of the anomalous skin effect in copper / Calatroni, Sergio (CERN)
This Mathematica Notebook allows calculating the RF surface impedance of copper, in the normal and anomalous skin effect regimes, for any value of frequency, temperature and magnetic field (thus including magnetoresistance effects). [...]
CERN-ACC-NOTE-2020-0029. - 2020. - 11 p.
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2020-05-11
13:20
Impedance Compliance Testing for the PS Internal Beam Dump / Jhugroo, Dhiren (University of Bath (GB)) ; Popovic, Branko Kosta ; Vollinger, Christine (CERN)
The performance of the accelerators at CERN critically depends on the overall beam coupling impedance of the individual elements. [...]
CERN-ACC-NOTE-2020-0028. - 2020. - 7 p.
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2020-04-27
10:58
Performance validation of the upgraded PSB Transfer Kicker BT2.KFA20 / Coralejo Feliciano, Luis Miguel (CERN) ; Sermeus, Luc (CERN)
In the framework of the LHC Injector Upgrade (LIU) project [1], the CERN PSB Transfer Kicker KFA20 pulse power generator has been modified, as done for the Transfer Kicker KFA10 pulse power generator, in order to be compatible with the extraction kinetic energy increase of the PSB from 1.4 to 2.0 GeV. [...]
CERN-ACC-NOTE-2020-0027. - 2020. - 3 p.
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2020-04-21
17:35
Beam-beam simulations for optimizing the performance of the High-luminosity Large Hadron Collider Proton Physics / Karastathis, Nikolaos (CERN) ; Papaphilippou, Yannis (CERN)
The High Luminosity LHC will have the challenge to operate in a high brightness regime. [...]
CERN-ACC-NOTE-2020-0026. - 2020. - 48 p.
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2020-04-17
11:08
Resistivity Characterization of Molybdenum-Coated Graphite-Based Substrates for High-Luminosity LHC Collimators / Accettura, Carlotta (Politecnico di Milano (IT)) ; Amorim, David (Universite Grenoble-Alpes (FR)) ; Antipov, Sergey ; Baris, Adrienn (CERN) ; Bertarelli, Alessandro (CERN) ; Biancacci, Nicolo (CERN) ; Calatroni, Sergio (CERN) ; Carra, Federico (CERN) ; Caspers, Fritz (European Scientific Institute (FR)) ; Garcia-Tabares Valdivieso, Elisa (CERN) et al.
The High-Luminosity Large Hadron Collider (HL-LHC) project aims at extending the operability of the LHC by another decade and increasing by more than a factor of ten the integrated luminosity that the LHC will have collected by the end of Run 3 [...]
CERN-ACC-NOTE-2020-0025. - 2020.

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2020-04-16
14:31
Beam-based measurements of the skew-sextupolar component of the radio frequency field of a HL-LHC-type crab-cavity / Carla', Michele (CERN) ; Alekou, Androula (University of Manchester (GB)) ; Bartosik, Hannes (CERN) ; Carver, Lee Robert (University of Liverpool (GB))
Two High Luminosity Large Hadron Collider (LHC) crab-cavity types have been installed in 2018 in the CERN SPS for testing purposes. [...]
CERN-ACC-NOTE-2020-0024. - 2020. - 26 p.
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2020-04-16
10:39
Review of LEIR operation in 2018 / Albright, Simon (CERN) ; Alemany Fernandez, Reyes (CERN) ; Angoletta, Maria Elena (CERN) ; Bartosik, Hannes (CERN) ; Beaumont, Anthony (CERN) ; Bellodi, Giulia (CERN) ; Biancacci, Nicolo (CERN) ; Bozzolan, Michele (CERN) ; Buzio, Marco (CERN) ; Di Lorenzo, Francesco (CERN) et al.
During run 2 (2015-2018) the LEIR machine experienced several important improvements in terms of extracted intensity, driven by the LHC Injectors Upgrade (LIU) project requirements. [...]
CERN-ACC-NOTE-2020-0023. - 2019. - 113 p.
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