2020-10-06
17:58 |
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2020-10-06
17:47 |
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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.
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2020. - 6 p.
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2020-10-02
06:50 |
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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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2020-10-01
06:01 |
Simulations of synchrotron-radiation-induced electron production in the CESR vacuum chamber wall
/ Crittenden, J A (Cornell U., CLASSE) ; Poprocki, S (Cornell U., CLASSE) ; Rubin, D L (Cornell U., CLASSE) ; Sagan, D (Cornell U., CLASSE)
We report on calculations of electron production by synchrotron radiation absorbed in the vacuum chamber walls of the Cornell Electron Storage Ring (CESR). These photo-electrons are the source of electron clouds which limit the performance of storage rings by causing betatron tune shifts, instabilities and emittance growth. [...]
2020 - 12 p.
- Published in : CERN Yellow Rep. Conf. Proc. 7 (2020) 183-194
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.183-194 (CERN-2020-007)
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2020-09-30
07:04 |
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2020-09-30
07:04 |
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