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MD3310 – Complex tune shift measurement at ﬂat-top in the LHC / Amorim, David (Universite Grenoble-Alpes (FR)) ; Antipov, Sergey ; Biancacci, Nicolo (CERN) ; Buffat, Xavier (CERN) ; Giordano, Francesco (Universita e sezione INFN di Napoli (IT)) ; Hemelsoet, Georges-Henry (CERN) ; Levens, Tom (CERN) ; Metral, Elias (CERN) ; Mounet, Nicolas (CERN) ; Ribes Metidieri, Ariadna (University of Barcelona (ES)) et al.
This note summarises the MD3310 activity. [...]
CERN-ACC-NOTE-2020-0053. - 2020. - 6 p.
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MD2490 – Measurement of the TMCI threshold at flat-top in the LHC / Albert, Markus (CERN) ; Amorim, David (Universite Grenoble-Alpes (FR)) ; Antipov, Sergey ; Biancacci, Nicolo (CERN) ; Buffat, Xavier (CERN) ; Carver, Lee Robert (University of Liverpool (GB)) ; Fuchsberger, Kajetan ; Mereghetti, Alessio ; Metral, Elias (CERN) ; Mounet, Nicolas (CERN) et al.
This report summarizes the results of MD2490 on the measurement of the intensity threshold of the Transverse Mode Coupling Instability (TMCI) in the LHC at flat top. [...]
CERN-ACC-NOTE-2020-0056. - 2020.
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Intensity dependance of the train instability threshold and high pile-up test with 12b trains (MD3294) / Buffat, Xavier (CERN) ; Amorim, David (Universite Grenoble-Alpes (FR)) ; Antipov, Sergey (CERN) ; Bartosik, Hannes (CERN) ; Crockford, Guy (CERN) ; Furuseth, Sondre (EPFL - Ecole Polytechnique Federale Lausanne (CH)) ; Iadarola, Giovanni (CERN) ; Levens, Tom (CERN) ; Metral, Elias (CERN) ; Mounet, Nicolas (CERN) et al.
As signs of electron cloud driven instabilities at top energy were observed in MDs in 2017 even with short trains(12b), an additional experiment was performed in 2018 to assess the intensity scaling of this instability mechanism using high intensity 12b trains available from the existing injector chain, i.e [...]
CERN-ACC-NOTE-2019-0027. - 2019. - 8 p.
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MD3318 – Impedance Contribution of Secondary and Tertiary Collimators / Amorim, David (Universite Grenoble-Alpes (FR)) ; Antipov, Sergey ; Biancacci, Nicolo (CERN) ; Buffat, Xavier (CERN) ; Mereghetti, Alessio (CERN) ; Metral, Elias (CERN) ; Redaelli, Stefano (CERN) ; Salvant, Benoit (CERN) ; Soderen, Martin (CERN) ; Valuch, Daniel (CERN)
This report summarises the results of MD3318 about impedance measurements of individual LHC secondary and tertiary collimators. [...]
CERN-ACC-NOTE-2020-0033. - 2020. - 11 p.
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MD1787 - LHC TDI tune shift measurement at injection / Amorim, David (Universite Grenoble-Alpes (FR)) ; Biancacci, Nicolo (CERN) ; Carbajo Perez, David (CERN) ; Carver, Lee Robert (University of Liverpool (GB)) ; Metral, Elias (CERN) ; Rijoff, Tatiana Libera ; Salvant, Benoit (CERN) ; Soderen, Martin (CERN) ; Valuch, Daniel (CERN)
This report summarizes the results of the backup activity performed after cancellation of the MD1787 [...]
CERN-ACC-NOTE-2020-0015. - 2019. - 3 p.
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MD3288: Instability latency with controlled noise / Furuseth, Sondre (EPFL - Ecole Polytechnique Federale Lausanne (CH)) ; Buffat, Xavier (CERN) ; Metral, Elias (CERN) ; Valuch, Daniel (CERN) ; Salvant, Benoit (CERN) ; Amorim, David (Universite Grenoble-Alpes (FR)) ; Mounet, Nicolas (CERN) ; Soderen, Martin (CERN) ; Antipov, Sergey (CERN) ; Pieloni, Tatiana (EPFL - Ecole Polytechnique Federale Lausanne (CH)) et al.
During this MD, performed on June 14th and July 26th, 2018, the latency of single bunch instabilities was tested with an external controllable noise produced by the ADT kicker. [...]
CERN-ACC-NOTE-2019-0011. - 2019. - 29 p.
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The Ghost Train Instability (MDs 2066 and 2936) / Carver, Lee Robert (University of Liverpool (GB)) ; Alemany Fernandez, Reyes (CERN) ; Amorim, David (Centre National de la Recherche Scientifique (FR)) ; Antipov, Sergey (CERN) ; Barraud, Laurent (Centre National de la Recherche Scientifique (FR)) ; Biancacci, Nicolo (CERN) ; Buffat, Xavier (CERN) ; Crockford, Guy (CERN) ; Hemelsoet, Georges-Henry (CERN) ; Levens, Tom (CERN) et al.
This notes describes experimental studies of the octupole strength required to stabilise bunch trains at 6.5 TeV in the LHC, performed over 3 MD blocks in 2017. [...]
CERN-ACC-NOTE-2018-0013. - 2018. - 13 p.
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MD 346: Summary of single bunch instability threshold measurements / Carver, Lee Robert (CERN) ; Biancacci, Nicolo (CERN) ; Metral, Elias (CERN) ; Salvant, Benoit (CERN) ; Levens, Tom (University of Glasgow (GB)) ; Buffat, Xavier (CERN) ; Pieloni, Tatiana (CERN) ; Tambasco, Claudia (Ecole Polytechnique Federale de Lausanne (CH)) ; Trad, Georges (CERN)
The purpose of this MD is to measure the octupole current threshold to reach single-bunch stability in the LHC at flat top. [...]
CERN-ACC-NOTE-2016-0002. - 2016. - 8 p.
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MD2013: Tune shift along the batch at flat top / Carver, Lee Robert (CERN) ; Valuch, Daniel (CERN) ; Buffat, Xavier (CERN) ; Giovannozzi, Massimo (CERN) ; Iadarola, Giovanni (CERN) ; Metral, Elias (CERN) ; Salvant, Benoit (CERN)
A series of tests were performed that led to a measurement of the tune shift along a 96 bunch batch with 25ns spacing at flat top. [...]
CERN-ACC-NOTE-2017-0011. - 2017. - 12 p.
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Beam-induced heat loads on the LHC arc beam screens with different beam and machine configurations: experiments and comparison against simulations / Iadarola, Giovanni (CERN) ; Skripka, Galina (Joint Institute for Nuclear Research (RU)) ; Albert, Markus (CERN) ; Amorim, David (Universite Grenoble-Alpes (FR)) ; Andujar, Oscar (CERN) ; Antipov, Sergey (CERN) ; Arduini, Gianluigi (CERN) ; Argyropoulos, Theodoros (CERN) ; Bradu, Benjamin (CERN) ; Bartosik, Hannes (CERN) et al.
Electron cloud (e-cloud) effects are among the main performance limitations for the operation of the Large Hadron Collider (LHC) with 25 ns bunch spacing. [...]
CERN-ACC-NOTE-2019-0057. - 2019. - 50 p.
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