CERN Accelerating science

ATS Reports

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2022-07-01
13:40
Measurement of Excess Noise in Thin Film and Metal Foil Resistor Networks / Beev, Nikolai (CERN)
Low-frequency resistance fluctuations cause excess noise in biased resistors. The magnitude of these fluctuations varies significantly between different resistor types. [...]
CERN-ACC-2022-0010.- Geneva : CERN, 2022
In : 2022 IEEE International Instrumentation and Measurement Technology Conference (I2MTC), Ottawa, Ca, 16 - 19 May 2022

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2022-07-01
13:34
A Metrology-grade Digitizer for Power Converters in the High Luminosity Large Hadron Collider / Beev, Nikolai (CERN) ; Cerqueira Bastos, Miguel (CERN) ; Martino, Michele (CERN) ; Valuch, Daniel (CERN)
The High Luminosity Large Hadron Collider project at CERN requires performance improvements in the precision powering of magnets, in particular for the new Nb3Sn based Inner Triplet magnets that provide the final focusing of the hadron beams at the interaction points of the ATLAS and CMS detectors. This work presents a new digitizer, the HPM7177, which is part of the signal chain for high precision measurements of magnet current..
CERN-ACC-2022-0009.- Geneva : CERN, 2022
In : 2022 IEEE International Instrumentation and Measurement Technology Conference (I2MTC), Ottawa, Ca, 16 - 19 May 2022

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2022-06-17
12:15
KlyC. The 1D/1.5D large signal computer code for the Klystron simulations. User Manual. Version 6. (included CGUN for the 2D electron beam optics simulation). / Cai, Jinchi (Lancaster University (GB)) ; Syratchev, Igor (CERN) ; Burt, Graeme Campbell (Lancaster University (GB))
Almost all accurate and efficient 2D large-signal codes for klystron simulations are proprietary and are not freely available to the wider klystron community [...]
CERN-ACC-2022-0008 ; CLIC-Note-1177.
- 2022. - 31 p.
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2022-06-17
12:05
DC Beam Stability issues in the first commercial prototype of a High Efficiency 8MW X-Band Klystron / Syratchev, Igor (CERN) ; Un Nisa, Zaib (CERN) ; Cai, Jinchi (Lancaster University (GB)) ; Burt, Graeme Campbell (Lancaster University (GB)) ; Anno, Toshiro (Canon Electron Tubes & Devices Co., Ltd (CETD))
The first commercial prototype of the new High Efficiency (HE) 8MW klystron was built and tested at CETD in the fall of 2021. [...]
CERN-ACC-2022-0007 ; CLIC-Note-1176.
- 2022. - 13 p.
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2022-06-16
12:17
Amorphous and Diamond-Like Carbon coatings for SEY reduction of dielectric materials for accelerating structure applications / Grudiev, Alexej (CERN) ; Neupert, Holger (CERN) ; Vollenberg, Wilhelmus (CERN) ; Jing, Chunguang (Euclid Techlabs LLC) ; Poddar, Shashi (Euclid Techlabs LLC) ; Freemire, Ben (Euclid Techlabs LLC)
Multipactor discharges in dielectric accelerating structures are a major limitation on the performance of this otherwise very promising technology for future high energy physics machines and other applications. [...]
CERN-ACC-2022-0006 ; CLIC-Note-1175.
- 2022. - 16 p.
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2022-05-05
15:29
Optics Measurement and Correction Strategies for HL-LHC / Buffat, Xavier (CERN) ; Carlier, Felix Simon (CERN) ; Coello De Portugal - Martinez Vazquez, Jaime Maria ; De Maria, Riccardo (CERN) ; Dilly, Joschua Werner (Humboldt University of Berlin (DE)) ; Fol, Elena (CERN) ; Fuster Martinez, Nuria ; Gamba, Davide (CERN) ; Garcia Morales, Hector ; Garcia-Tabares Valdivieso, Ana (Universidad Complutense (ES)) et al.
The baseline strategy for optics commissioning in the HL-LHC era is presented and reviewed in detail, along with recent developments and unsolved matters in the linear and nonlinear optics measurement and correction techniques..
CERN-ACC-2022-0004.
- 2022. - 102 p.

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2022-04-28
11:39
Special relativity, electromagnetism, classical and quantum mechanics: what to remember for particle accelerators / Metral, Elias (CERN)
The goal of these lectures (of 6 times 45 minutes), which have been prepared for the Riga Technical University Course "Accelerator Technologies” (https://indico.cern.ch/event/1149120/), is to provide the necessary background to understand in detail the accelerator physics and perform all the necessary computations. [...]
CERN-ACC-SLIDES-2022-0001.
- 2022. - 333 p.
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2022-04-01
17:41
Experimental verification of thermal model for PCB mounted MOSFETs used on parallel H-bridge structures. / Garcia Retegui, Rogelio (ICYTE CONICET-UNMdP) ; Wassinger, Nicolas (ICYTE CONICET-UNMdP) ; Maestri, Sebastian (ICYTE CONICET-UNMdP) ; Antoszczuk, Pablo Daniel (ICYTE CONICET-UNMdP) ; Funes, Marcos (ICYTE CONICET-UNMdP) ; Pittet, Serge (CERN)
The upgrade of the Large Hadron Collider (LHC) towards the High Luminosity-LHC (HL-LHC) presents different challenges, among them, the upgrade of the power converters associated to the inner triplet magnets to reach the required nominal current of 18 kA. [...]
CERN-ACC-2021-014.
- 2021. - 7 p.
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2022-04-01
16:39
Conclusion of the Electrical Conformity Assessment Panel on the Installation of the MBH Magnet S2 in the LHC / Siemko, Andrzej (CERN) ; Devred, Arnaud (CERN) ; Rodriguez Mateos, Felix (CERN) ; Schmidt, Rudiger (GSI - Helmholtzzentrum fur Schwerionenforschung GmbH (DE)) ; Verweij, Arjan (CERN) ; Wenninger, Jorg (CERN)
In this report we assess the feasibility for installation of the $Nb_{3}$Sn MBH S2 magnet in the LHC and conclude on possible performance limitations..
CERN-ACC-2021-013.
- 2021. - 26 p.

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2022-03-11
10:47
HL-LHC Run 4 proton operational scenario / Tomas Garcia, Rogelio (CERN) ; Arduini, Gianluigi (CERN) ; Baudrenghien, Philippe (CERN) ; Bruning, Oliver (CERN) ; Bruce, Roderik (CERN) ; Buffat, Xavier (CERN) ; Calaga, Rama (CERN) ; De Maria, Riccardo (CERN) ; Dilly, Joschua Werner (Humboldt University of Berlin (DE)) ; Efthymiopoulos, Ilias (CERN) et al.
Following new findings in beam dynamics and the latest HL-LHC project decisions, an operational scenario has been developed for the first HL-LHC run, Run 4. [...]
CERN-ACC-2022-0001.
- 2022. - 37 p.
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