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LHC MD Notes

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2020-04-16
09:42
MD1875 – Impedance Contribution of Single IR7 Secondary Collimators / Mereghetti, Alessio (CERN) ; Amorim, David (Universite Grenoble-Alpes (FR)) ; Biancacci, Nicolo (CERN) ; Carver, Lee Robert (University of Liverpool (GB)) ; Metral, Elias (CERN) ; Mirarchi, Daniele (University of Manchester (GB)) ; Redaelli, Stefano (CERN) ; Salvant, Benoit (CERN) ; Soderen, Martin (CERN)
This report summarises the results of MD1875 about impedance measurements of single LHCsecondary collimators in IR7. [...]
CERN-ACC-NOTE-2020-0022.
- 2020. - 8 p.
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2020-04-16
09:37
MD1447 –β∗–Reach: 2016 IR7 Collimation Hierarchy Limit and Impedance / Mereghetti, Alessio (CERN) ; Amorim, David (Universite Grenoble-Alpes (FR)) ; Biancacci, Nicolo (CERN) ; Bonanno, Edoardo (Universita degli studi di Palermo (IT)) ; Carver, Lee Robert (University of Liverpool (GB)) ; Ferrazza, Diego (Universita e INFN, Roma I (IT)) ; Lefevre, Thibaut (CERN) ; Levens, Tom (CERN) ; Metral, Elias (CERN) ; Quaranta, Elena et al.
This report summarizes the results of MD1447 about the hierarchy limit of the LHC collimation system in IR7 at 6.5 TeV and its impedance, performed during MD block 1 of 2016. [...]
CERN-ACC-NOTE-2020-0021.
- 2020. - 24 p.
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2020-04-16
09:28
MD1446 –β∗–Reach: Impedance Contribution of Primary Collimators / Mereghetti, Alessio (CERN) ; Amorim, David (Universite Grenoble-Alpes (FR)) ; Biancacci, Nicolo (CERN) ; Fiascaris, Maria (CERN) ; Metral, Elias (CERN) ; Redaelli, Stefano (CERN) ; Salvant, Benoit (CERN) ; Soderen, Martin (CERN)
This report summarizes the results of MD1446 on impedance measurements of single primary collimators. [...]
CERN-ACC-NOTE-2020-0020.
- 2020. - 8 p.
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2020-03-06
16:25
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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2020-02-18
12:10
MD4944: Local linear coupling measurement at the IPs / Persson, Tobias Hakan Bjorn (CERN) ; Carlier, Felix Simon (Technische Universiteit Delft (NL)) ; Hofer, Michael (Vienna University of Technology (AT)) ; Maclean, Ewen Hamish (University of Malta (MT)) ; Tomas Garcia, Rogelio (CERN) ; Garcia-Tabares Valdivieso, Ana (Universidad Complutense (ES))
It was observed that a large local linear coupling around IP2 reduced the luminosity during the 2018 ion run. [...]
CERN-ACC-NOTE-2020-0013.
- 2020. - 9 p.

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2020-01-23
17:31
MD 3584: Long-Range Beam-Beam 2018 / Karastathis, Nikos ; Fartoukh, Stephane (CERN) ; Kostoglou, Sofia (National Technical Univ. of Athens (GR)) ; Papaphilippou, Yannis (CERN) ; Pojer, Mirko (CERN) ; Poyet, Axel (Universite Grenoble-Alpes (FR)) ; Solfaroli Camillocci, Matteo (CERN) ; Sterbini, Guido (CERN)
A recurrent issue of the LHC operation, observed both during Run1 and Run2 is the asymmetric behaviour of the two beams in terms of particle losses. [...]
CERN-ACC-NOTE-2020-0011.
- 2020. - 29 p.
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2020-01-23
14:37
LHC MD 2401: Beam-Based Measurement of the MKD Rise Time / Wiesner, Christoph (CERN) ; Bartmann, Wolfgang (CERN) ; Bracco, Chiara (CERN) ; Carlier, Etienne (CERN) ; Fraser, Matthew Alexander (CERN) ; Hessler, Christoph ; Magnin, Nicolas (CERN) ; Renner, Elisabeth (Vienna University of Technology (AT))
This note summarises the beam-based measurements of the MKD rise time for both LHC beams performed during MD4 on December 2nd, 2017 and discusses the results [...]
CERN-ACC-NOTE-2020-0010.
- 2018. - 6 p.
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2020-01-17
14:37
LHC MD4044: Asynchronous Beam Dump Test with Bunched Beam at Flat Top / Wiesner, Christoph (CERN) ; Apollonio, Andrea (CERN) ; Bartmann, Wolfgang (CERN) ; Bracco, Chiara (CERN) ; Carlier, Etienne (CERN) ; Frankl, Matthias Immanuel ; Fraser, Matthew Alexander (CERN) ; Hessler, Christoph ; Lechner, Anton (CERN) ; Magnin, Nicolas (CERN) et al.
This note summarises the LHC Machine Development (MD) 4044, which studied the beam-loss and quench behaviour during asynchronous beam dumps at injection and at top energy using bunched beam in the abort gap. [...]
CERN-ACC-NOTE-2020-0009.
- 2020. - 15 p.
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2020-01-17
14:34
LHC MD2930: Asynchronous Beam Dump Test with Bunched Beam / Wiesner, Christoph (CERN) ; Bartmann, Wolfgang (CERN) ; Bracco, Chiara (CERN) ; Carlier, Etienne (CERN) ; Fraser, Matthew Alexander (CERN) ; Hessler, Christoph ; Lechner, Anton (CERN) ; Magnin, Nicolas (CERN) ; Renner, Elisabeth (Vienna University of Technology (AT)) ; Wollmann, Daniel (CERN) et al.
This note summarises the results of LHC Machine Development (MD) 2930, which studied the beam-loss behaviour during asynchronous beam dumps at 450 GeV and at 6.5 TeV using bunched beam in the abort gap. [...]
CERN-ACC-NOTE-2020-0008.
- 2020. - 10 p.
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2020-01-16
17:27
An alternative method to measure amplitude dependence of the closest tune approach / Maclean, Ewen Hamish (University of Malta (MT)) ; Carlier, Felix Simon (Technische Universiteit Delft (NL)) ; Persson, Tobias Hakan Bjorn (CERN) ; Tomas Garcia, Rogelio (CERN) ; Fuchsberger, Kajetan
In the linear regime, a minimum closest approach of the fractional horizontal and vertical tunes exists, due to linear coupling between the transverse planes. [...]
CERN-ACC-NOTE-2020-0007.
- 2020.
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