CERN Accelerating science

CERN Document Server Encontrados 9 registros  La búsqueda tardó 0.77 segundos. 
1.
Coping with longitudinal instabilities using controlled emittance blow-up / Timko, H (CERN) ; Albright, S (CERN) ; Argyropoulos, T (CERN) ; Baudrenghien, P ; Damerau, H (CERN) ; Müller, J Esteban (CERN) ; Haas, A ; Papotti, G (CERN) ; Quartullo, D (CERN) ; Repond, J (CERN) et al.
Controlled emittance blow-up is a widely-spread method to mitigate beam instabilities in accelerators. This paper summarises the different methods used to generate and apply RF phase noise or RF phase modulation in the RF systems of the CERN synchrotrons. [...]
2020 - 6 p. - Published in : 10.23732/CYRCP-2020-009.84 Fulltext: PDF;
In : ICFA mini-Workshop on Mitigation of Coherent Beam Instabilities in Particle Accelerators (MCBI 2019), Zermatt, Switzerland, 23 - 27 Sep 2019, pp.84 (CERN-2020-009)
2.
LHC Longitudinal Beam Dynamics during Run 2 / Timko, H (CERN) ; Argyropoulos, T (CERN) ; Baudrenghien, P (CERN) ; Calaga, R (CERN) ; Długosz, D (CERN) ; Müller, J F Esteban (CERN) ; Karpov, I (CERN) ; Medrano, L E Medina (CERN) ; Palm, M (CERN) ; Salvachua, B (CERN) et al.
During the LHC Run 2, many advances have been made on the beam dynamics in the longitudinal plane. The controlled longitudinal emittance blow-up used in the acceleration ramp was improved and bunch flattening was implemented for bunch length control during collisions. [...]
Geneva, Switzerland : , 2019 - 7 p. - Published in : , pp. 245-251 Fulltext: PDF;
In : 9th LHC Operations Evian Workshop, Evian Les Bains, France, 30 Jan - 1 Feb 2019, pp.245-251
3.
TDI - past observations and improvements for 2016 / Lechner, A (CERN) ; Barnes, M J (CERN) ; Bartmann, W (CERN) ; Biancacci, N (CERN) ; Bracco, C (CERN) ; Bregliozzi, G (CERN) ; Butcher, M (CERN) ; Muller, J Esteban (CERN) ; Folch, R (CERN) ; Gentini, L (CERN) et al.
In Run 1, the LHC injection absorbers (TDIs) were affected by several anomalies including structural damage of the beam screens and elastic deformations of the jaws due to heating during fills. Other issues became apparent in 2015, like excessive vacuum spikes, which gave rise to several beam dumps, as well as quality issues affecting the hBN absorber blocks. [...]
Geneva : CERN, 2016 - 8 p. - Published in : (2016) , pp. 123-130 Fulltext: PDF;
In : 6th Evian Workshop on LHC beam operation, Evian Les Bains, France, 15 - 17 Dec 2015, pp.123-130
4.
LHC MD 1279: Bunch Flattening in Physics / Timko, Helga (CERN) ; Baudrenghien, Philippe (CERN) ; Esteban Muller, Juan ; Shaposhnikova, Elena (CERN)
Vertex reconstruction is not accurate enough for LHCb when the bunch length in physics shrinks below about 0.9 ns. [...]
CERN-ACC-NOTE-2017-0019.
- 2017. - 13 p.
Full text
5.
LHC MD 1087: Controlled Longitudinal Emittance Blow-up with Short Bunches / Timko, Helga (CERN) ; Baudrenghien, Philippe (CERN) ; Esteban Muller, Juan ; Jaussi, Michael (CERN) ; Lasheen, Alexandre (CERN) ; Shaposhnikova, Elena (CERN)
The aim of the MD was to study the controlled longitudinal emittance blow-up applied during the ramp with bunches that are slightly shorter than operational. [...]
CERN-ACC-NOTE-2017-0018.
- 2017. - 7 p.
Full text
6.
LHC MD 652: Coupled-Bunch Instability with Smaller Emittance (all HOMs) / Esteban Muller, Juan ; shaposhnikova, Elena (CERN) ; Timko, Helga (CERN)
The aim of the MD was to measure the coupled-bunch stability from all HOM impedances, with a reduced longitudinal emittance in order to explore the HL-LHC conditions. [...]
CERN-ACC-NOTE-2017-0017.
- 2017. - 6 p.
Full text
7.
LHC MD 232: Longitudinal Impedance Evaluation / Esteban Muller, Juan ; Timko, Helga (CERN) ; Baudrenghien, Philippe (CERN) ; Shaposhnikova, Elena (CERN)
The aim of the MDstudies presented here was to evaluate the imaginary part of the longitudinal impedance of the LHC by means of synchrotron frequency shift measurements [...]
CERN-ACC-NOTE-2017-0016.
- 2017. - 6 p.
Full text
8.
Longitudinal intensity effects in the CERN Large Hadron Collider / Esteban Muller, Juan
This PhD thesis provides an improved knowledge of the LHC longitudinal impedance model and a better understanding of the longitudinal intensity effects [...]
CERN-THESIS-2016-066 - 149 p.

Fulltext
9.
HL-LHC Operational Scenarios / Metral, Elias (CERN) ; Arduini, Gianluigi (CERN) ; Banfi, Danilo (Ecole Polytechnique Federale de Lausanne) ; Barranco Garcia, Javier (Ecole Polytechnique Federale de Lausanne (CH)) ; Biancacci, Nicolo (CERN) ; Brüning, Oliver (CERN) ; De Maria, Riccardo (CERN) ; Giovannozzi, Massimo (CERN) ; Höfle, Wolfgang (CERN) ; Li, Kevin (CERN) et al.
The main aim of this document is to have a clearly identified set of beam and machine parameters to be used for numerical simulations..
CERN-ACC-NOTE-2015-0009.
- 2015. - 11 p.
CERN-ACC-NOTE-2015-0009 - Full text

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