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2023-11-22
11:39
Measurements of the Dielectric Properties of a Ferroelectric Ceramic for Use in a Fast Reactive Tuner / FREEMIRE, Ben (Euclid TechLabs)
A FerroElectric Fast Reactive Tuner (FE-FRT) for superconducting radio frequency cavities offers several advantages over conventional mechanical tuners, including faster reaction time, no moving parts, and a wide tuning range. [...]
CERN-ACC-NOTE-2020-0070. - 2020. - 32 p.
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2023-11-22
11:29
Analytic Computation of a Ferro-Electric Fast Reactive Tuner / Ben-Zvi, Ilan ; Macpherson, Alick (CERN) ; Castilla Loeza, Alejandro (Lancaster University (GB)) ; Shipman, Nicholas (Lancaster University (GB))
An analytic solution using the MapleÒ application [1] of a Ferroelectric Fast Reactive Tuner (FE- FRT) is presented. [...]
CERN-ACC-NOTE-2023-0021. - 2023. - 36 p.
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2022-11-08
11:21
Low-Frequency Analytical Model of Superconducting Magnet Impedance / Martino, Michele (CERN)
A superconducting magnet for particle accelerators is often modeled as an ideal inductor, as it indeed exhibits a completely negligible resistance; this is fully satisfactory, as an example, for control purposes, as the time constant formed by the magnet inductance and the resistance of normal conducting cables connecting it to the power converter accurately describe the essentially dominant dynamics of the circuit. Such a model would however fail to correctly represent the noise attenuation mechanism at play in practical superconducting magnets, which also include a vacuum pipe or a beam screen in the inner part of the aperture, an iron yoke on the outer part, and, potentially, a stainless steel or aluminum collar in between. [...]
CERN-ACC-2022-0011.- Geneva : CERN, 2022 - 13 p. - Published in : Model. Simul. Eng. 2022 (2022) 2105847 Fulltext: PDF;

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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. [...]
arXiv:2109.02448; CERN-ACC-2022-0010.- Geneva : CERN, 2022-05-16 - 6 p. - Published in : 10.1109/I2MTC48687.2022.9806690 Fulltext: PDF;
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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2022-04-01
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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2021-12-15
10:45
Proof-of-principle of the ultra-narrowband detection scheme at 30 GHz toward weakly interacting slim particle search / Miyazaki, Akira (Uppsala University (SE)) ; Caspers, Fritz (European Scientific Institute (FR)) ; Steinmann, J L (Karlsruhe Institute of Technology) ; Ruess, Tobias (Karlsruhe Institute of Technology) ; Jelonnek, John (Karlsruhe Institute of Technology)
A coherent detection scheme was tested for dark photons and axion search with millimeter waves [...]
CERN-ACC-NOTE-2021-0032. - 2021.
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2021-11-24
11:27
Benchmark of e-cooling simulations with RF-Track / Borucka, Agnieszka Elzbieta (Warsaw University of Technology (PL)) ; Gamba, Davide (CERN) ; Latina, Andrea (CERN)
Electron cooling is a commonly-used technique to reduce emittance and momentum spread in ion storage rings. [...]
CERN-ACC-NOTE-2021-0031. - 2021.

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2021-10-11
09:28
FIRST PROOF-OF-CONCEPT PROTOTYPE OF AN ADDITIVE-MANUFACTURED RADIO FREQUENCY QUADRUPOLE / Torims, Toms (Riga Technical University (LV)) ; Ratkus, Andris (Riga Technical University (LV)) ; Pikurs, Guntis (Riga Technical University (LV)) ; Gruber, S (Fraunhofer Institute, Dresden, Germany) ; Vretenar, Maurizio (CERN) ; Vedani, Maurizio ; Lopez, Elena (Fraunhofer Insitute, Dresden, Germany) ; Bruckner, F (Fraunhofer Institute. Dresden, Germany and Lulea University, Sweden)
Continuous developments in Additive Manufacturing (AM) technologies are opening opportunities in novel machining, and improving design alternatives for modern particle accelerator components [...]
CERN-ACC-NOTE-2021-0024. - 2021. - 12 p.
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2021-07-21
16:33
GaToroid - Status and Perspectives / Bottura, Luca (CERN) ; Dutheil, Yann (CERN) ; Felcini, Enrico (EPFL - Ecole Polytechnique Federale Lausanne (CH)) ; Haziot, Ariel (CERN) ; Lehtinen, Tuukka (CERN) ; Tommasini, Davide (CERN) ; Vernassa, Gianluca (INFN e Universita Genova (IT))
We describe in this report the status of the study performed at CERN on GaToroid, an idea of a novel magnetic configuration based on the symmetry properties of a toroidal magnetic field, that could find its use in gantries for hadron therapy. [...]
CERN-ACC-NOTE-2021-0017 ; NIMMS-Note-003 ; EDMS 2444379. - 2020. - 52 p.
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