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Instabilities and beam induced heating in 2015
/ Carver, L R (CERN) ; Arduini, G (CERN) ; Astapovych, D (CERN) ; Barnes, M (CERN) ; Barranco, J (CERN) ; Biancacci, N (CERN) ; Buffat, X (CERN) ; Day, H (CERN) ; Hofle, W (CERN) ; Iadarola, G (CERN) et al.
Instabilities were observed during operation at injection, flat top and during
the betatron squeeze. This resulted in high chromaticities and octupole currents
in all stages of the machine cycle. [...]
Geneva : CERN, 2016 - 6 p.
- Published in : (2016) , pp. 95-100
Fulltext: PDF;
In : 6th Evian Workshop on LHC beam operation, Evian Les Bains, France, 15 - 17 Dec 2015, pp.95-100
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Instabilities and beam induced heating in 2016
/ Carver, L R (CERN) ; Amorim, D (CERN) ; Arduini, G (CERN) ; Barranco, J (CERN) ; Biancacci, N (CERN) ; Buffat, X (CERN) ; Hofle, W (CERN) ; Iadarola, G (CERN) ; Kotzian, G (CERN) ; Levens, K (CERN) et al.
Coherent instabilities have been regularly observed during operation in 2016. Issues relating to linear coupling at injection in 2015 were no longer observed in 2016 due to new applications that were made operational, however new instabilities that caused emittance blowup were sporadically observed in Adjust and Stable Beams that do not yet have a full explanation. [...]
Geneva : CERN, 2017 - 6 p.
- Published in : (2017) , pp. 141-146
Fulltext: PDF;
In : 7th Evian Workshop on LHC beam operation, Evian Les Bains, France, 13 - 15 Dec 2016, pp.141-146
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Current Status of Instability Threshold Measurements in the LHC at 6.5 TeV
/ Carver, Lee (CERN) ; Barranco, Javier (Ecole Polytechnique, Lausanne) ; Biancacci, Nicolo (CERN) ; Buffat, Xavier (CERN) ; Höfle, Wolfgang (CERN) ; Kotzian, Gerd (CERN) ; Lefèvre, Thibaut (CERN) ; Levens, Thomas (CERN) ; Métral, Elias (CERN) ; Pieloni, Tatiana (CERN) et al.
Throughout 2015, many measurements of the minimum stabilizing octupole current required to prevent coherent transverse instabilities have been performed. These measurements allow the LHC impedance model at flat top to be verified and give good indicators of future performance and limitations. [...]
CERN-ACC-2016-234.-
2016 - 4 p.
- Published in : 10.18429/JACoW-IPAC2016-TUPMW011
Published version from JACoW: PDF;
In : 7th International Particle Accelerator Conference, Busan, Korea, 8 - 13 May 2016, pp.TUPMW011
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Experimental Characterisation of a Fast Instability Linked to Losses in the 16L2 Cryogenic Half-Cell in the CERN LHC
/ Salvant, Benoit (CERN) ; Antipov, Sergey (CERN) ; Arduini, Gianluigi (CERN) ; Biancacci, Nicolo (CERN) ; Buffat, Xavier (CERN) ; Carver, Lee (CERN) ; Collier, Paul (CERN) ; Gorzawski, Arkadiusz (CERN) ; Höfle, Wolfgang (CERN) ; Iadarola, Giovanni (CERN) et al.
The operation during the summer months of the 2017 Run of the CERN LHC was plagued with fast beam losses that repeatedly occurred in the 16th arc half-cell at the left of IP2 as well as in the collimation insertion, leading to unwanted beam dumps. Transverse coherent oscillations were observed during this fast process. [...]
CERN-ACC-2018-175.-
2018 - 4 p.
- Published in : 10.18429/JACoW-IPAC2018-THPAF058
Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.THPAF058
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Tune measurement from transverse feedback signals in LHC
/ Dubouchet, F (CERN) ; Höfle, W (CERN) ; Kotzian, G (CERN) ; Levens, T E (CERN) ; Valuch, D (CERN) ; Albuquerque, P (Geneva, HEPIA)
2013
Published version from JACoW: PDF;
In : 2nd International Beam Instrumentation Conference, Oxford, UK, 16 - 19 Sep 2013, pp.TUPF29
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Observations, Analysis and Mitigation of Recurrent LHC Beam Dumps Caused by Fast Losses in Arc Half-Cell 16L2
/ Jimenez, José (CERN) ; Amorim, David (CERN ; U. Grenoble Alpes) ; Antipov, Sergey (CERN) ; Arduini, Gianluigi (CERN) ; Bertarelli, Alessandro (CERN) ; Biancacci, Nicolo (CERN) ; Bradu, Benjamin (CERN) ; Bravin, Enrico (CERN) ; Bregliozzi, Giuseppe (CERN) ; Brodzinski, Krzysztof (CERN) et al.
Recurrent beam dumps significantly perturbed the operation of the CERN LHC in the summer months of 2017, especially in August. These unexpected beam dumps were triggered by fast beam losses that built up in the cryogenic beam vacuum at the half-cell 16 left of LHC-IP2 and were detected either at that location but mainly in the collimation insertions. [...]
CERN-ACC-2018-164.-
2018 - 4 p.
- Published in : 10.18429/JACoW-IPAC2018-MOPMF053
Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.MOPMF053
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First BTF Measurements at the Large Hadron Collider
/ Tambasco, Claudia (CERN ; Ecole Polytechnique, Lausanne) ; Barranco, Javier (Ecole Polytechnique, Lausanne) ; Boccardi, Andrea (CERN) ; Buffat, Xavier (CERN) ; Fuchsberger, Kajetan (CERN) ; Gąsior, Marek (CERN) ; Giachino, Rossano (CERN) ; Lefèvre, Thibaut (CERN) ; Levens, Thomas (CERN) ; Pieloni, Tatiana (CERN) et al.
During the Run I in 2012, several instabilities have been observed at the Large Hadron Collider (LHC) during the Betatron squeeze. The predictions of instability thresholds are based on the computation of the beam Landau damping by calculating the Stability Diagrams (SD). [...]
CERN-ACC-2016-194.-
2016 - 4 p.
- Published in : 10.18429/JACoW-IPAC2016-WEPOY030
Published version from JACoW: PDF;
In : 7th International Particle Accelerator Conference, Busan, Korea, 8 - 13 May 2016, pp.WEPOY030
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10.
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MD1228: Validation of Single Bunch Stability Threshold & MD1751: Instability Studies with a Single Beam
/ Carver, Lee Robert (CERN) ; Amorim, David (Universite Grenoble-Alpes (FR)) ; Biancacci, Nicolo (CERN) ; Buffat, Xavier (CERN) ; Iadarola, Giovanni (CERN) ; Lasocha, Kacper (Jagiellonian University (PL)) ; Li, Kevin Shing Bruce (CERN) ; Levens, Tom (University of Glasgow (GB)) ; Metral, Elias (CERN) ; Salvant, Benoit (CERN) et al.
Instabilities were being routinely observed in B1V during ADJUST. [...]
CERN-ACC-NOTE-2017-0013.
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2017. - 13 p.
Access to fulltext
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