CERN Accelerating science

Accelerator Physics

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2020-10-27
16:57
Combined ramp and telescopic squeeze: MD 3270 / Fartoukh, Stephane (CERN) ; Azzopardi, Gabriella (CERN) ; Bruce, Roderik (CERN) ; Buffat, Xavier (CERN) ; Coello De Portugal - Martinez Vazquez, Jaime Maria ; Fuster Martinez, Nuria ; Iadarola, Giovanni (CERN) ; Karastathis, Nikos ; Kostoglou, Sofia (CERN) ; Maclean, Ewen Hamish (CERN) et al.
This paper highlights the outcome of the 2018 round ATS MD program, which aimed at demonstrating the feasibility of a combined ramp and telescopic squeeze as a potential key ingredient to operate the machine in Run 3, with much brighter and more energetic beams with respect to Run 2. [...]
CERN-ACC-2020-0028.
- 2020. - 40 p.

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2020-10-27
16:18
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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2020-10-27
15:57
Status of the ESSnuSB Extraction Design / Alekou, Androula (University of Manchester (GB)) ; Bartosik, Hannes (CERN) ; Efthymiopoulos, Ilias (CERN)
In the European Spallation Source (ESS) neutrino Super Beam (ESSnuSB), a very intense neutrino beam will be produced in order to measure with a high precision the CP violating angle at the 2nd oscillation maximum. [...]
CERN-ACC-2020-0027.
- 2020. - 7 p.

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2020-10-06
17:58
A Vlasov approach to study transverse instabilities driven by electron clouds / Iadarola, Giovanni (CERN) ; Mether, Lotta (CERN) ; Mounet, Nicolas (CERN) ; Sabato, Luca
We present a linearized method to study transverse instabilities due to electron clouds. [...]
CERN-ACC-NOTE-2020-0054.
- 2020. - 22 p.
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2020-10-06
17:47
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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2020-10-02
06:50
Linearized method for the study of transverse instabilities driven by electron clouds / Iadarola, Giovanni (CERN) ; Mether, Lotta (CERN) ; Mounet, Nicolas (CERN) ; Sabato, Luca (CERN)
We present a linearized method to study transverse instabilities due to electron clouds. It is based on an accurate and compact characterization of the cloud dipolar and quadrupolar forces, that can be easily obtained from quick single-pass numerical simulations. [...]
2020 - 15 p. - Published in : Phys. Rev. Accel. Beams 23 (2020) 081002 Fulltext from Publisher: PDF;

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2020-10-01
06:01
Photo reflectivity and photo electron yield from technical surfaces / Liedl, A (Frascati) ; Angelucci, M (Frascati) ; La Francesca, E (Frascati ; Rome U.) ; Schäfers, F (Helmholtz-Zentrum, Berlin) ; Sertsu, M G (Helmholtz-Zentrum, Berlin) ; Siewert, F (Helmholtz-Zentrum, Berlin) ; Sokolov, A (Helmholtz-Zentrum, Berlin) ; Cimino, R (Frascati)
The knowledge of material properties is an essential stepto design particle accelerators and High Energy Colliders.During operation of these machines, the walls of the vac-uum chambers are subjected to bombardment of photonsand electrons. The detrimental interactions may be followedby issues related to vacuum and beam instability. [...]
2020 - 6 p. - Published in : CERN Yellow Rep. Conf. Proc. 7 (2020) 125-130 Fulltext from publisher: PDF;
In : ECLOUD’18: Proceedings of the Joint INFN-CERN-ARIES Workshop on Electron-Cloud Effects, La Biodola, Isola d'Elba, Italy, 3 - 7 Jun 2018, pp.125-130 (CERN-2020-007)

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2020-10-01
06:01
Experiments with stable confined electron columns / Thoma, K I (Goethe U., Frankfurt (main)) ; Britten, V (Goethe U., Frankfurt (main)) ; Droba, M (Goethe U., Frankfurt (main)) ; Meusel, O (Goethe U., Frankfurt (main)) ; Podlech, H (Goethe U., Frankfurt (main)) ; Scheible, B (Goethe U., Frankfurt (main)) ; Schulte, K (Goethe U., Frankfurt (main))
Gabor Lenses were invented for focusing ion beams by the electric field of a confined electron column. In synchrotrons spontaneously occurring electron clouds have an influence on the beam dynamics. [...]
2020 - 3 p. - Published in : CERN Yellow Rep. Conf. Proc. 7 (2020) 143-146 Fulltext from publisher: PDF;
In : ECLOUD’18: Proceedings of the Joint INFN-CERN-ARIES Workshop on Electron-Cloud Effects, La Biodola, Isola d'Elba, Italy, 3 - 7 Jun 2018, pp.143-146 (CERN-2020-007)

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2020-10-01
06:01
Electron cloud effects in SuperKEKB commissioning / Ohmi, K (KEK, Tsukuba ; Sokendai, Tsukuba) ; Flanagan, J (KEK, Tsukuba ; Sokendai, Tsukuba) ; Fukuma, H (KEK, Tsukuba ; Sokendai, Tsukuba) ; Ikeda, H (KEK, Tsukuba ; Sokendai, Tsukuba) ; Mulyani, E (KEK, Tsukuba ; Sokendai, Tsukuba) ; Shibata, K (KEK, Tsukuba ; Sokendai, Tsukuba) ; Suetsugu, Y (KEK, Tsukuba ; Sokendai, Tsukuba) ; Tobiyama, M (KEK, Tsukuba ; Sokendai, Tsukuba)
A vertical emittance growth (beam size blow-up) due to electron cloud has been observed in the positron low energy ring (LER) in Phase-I commissioning (2016) of SuperKEKB. The emittance growth is caused by fast head-tail instability due to wake force induced by electron cloud. [...]
2020 - 4 p. - Published in : CERN Yellow Rep. Conf. Proc. 7 (2020) 179-182 Fulltext from publisher: PDF;
In : ECLOUD’18: Proceedings of the Joint INFN-CERN-ARIES Workshop on Electron-Cloud Effects, La Biodola, Isola d'Elba, Italy, 3 - 7 Jun 2018, pp.179-182 (CERN-2020-007)

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2020-10-01
06:01
Preliminary results obtained with the LHC Vacuum Pilot Sector / Buratin, E (CERN ; Ecole Polytechnique, Lausanne) ; Baglin, V (CERN) ; Henrist, B (CERN)
The Large Hadron Collider (LHC) is affected by electron cloud that reduces the quality of the beam, provokes instabilities, and increases the residual-gas pressure and heat load in the vacuum chambers. Synchrotron radiation, via photoelectron emission, plays also an important role in the electron cloud build-up. [...]
2020 - 6 p. - Published in : CERN Yellow Rep. Conf. Proc. 7 (2020) 195-200 Fulltext from publisher: PDF;
In : ECLOUD’18: Proceedings of the Joint INFN-CERN-ARIES Workshop on Electron-Cloud Effects, La Biodola, Isola d'Elba, Italy, 3 - 7 Jun 2018, pp.195-200 (CERN-2020-007)

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