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135.
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The mode matching technique applied to the transverse beam coupling impedance calculation of azimuthally symmetric devices of finite length
/ Biancacci, N (CERN) ; Métral, E (CERN) ; Salvant, B (CERN) ; Zannini, C (CERN) ; Vaccaro, V G (Naples U. ; INFN, Naples) ; Migliorati, M (Rome U.) ; Palumbo, L (Rome U.)
The infinite length approximation is often used to simplify the calculation of the beam coupling impedance of accelerator elements. This is expected to be a reasonable assumption for devices whose length is greater than the transverse dimension but may be a less accurate approximation for segmented devices. [...]
CERN-ACC-2014-0087.-
Geneva : CERN, 2014 - 4 p.
Fulltext: PDF; External link: Published version from JaCoW
In : 5th International Particle Accelerator Conference, Dresden, Germany, 15 - 20 Jun 2014, pp.1714
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136.
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137.
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The PS Upgrade Program: Recent Advances
/ Gilardoni, SS (CERN) ; Bart Pedersen, S (CERN) ; Bertone, C (CERN) ; Biancacci, N (CERN) ; Blas, A (CERN) ; Damjanovic, S (CERN) ; Bodart, D (CERN) ; Borburgh, J (CERN) ; Chiggiato, P (CERN) ; Damerau, H (CERN) et al.
The LHC Injectors Upgrade project (LIU) has been initiated to improve the performances of the existing injector complex at CERN to match the future requirements of the HL-LHC (High Luminosity LHC). In this framework, the Proton Synchrotron (PS) will undergo fundamental changes for many of its main systems: the injection energy will be increased to reduce space-charge effects, the transverse damper will be improved to cope with transverse instabilities, and the RF systems will be upgraded to accelerate higher beam intensity and brightness. [...]
CERN-ACC-2013-0162.-
Geneva : CERN, 2013 - 3 p.
Fulltext: PDF;
In : 4th International Particle Accelerator Conference, Shanghai, China, 12 - 17 May 2013, pp.2594
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138.
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Beam Coupling Impedance Localization Technique Validation and Measurements in the CERN Machines
/ Biancacci, N (CERN) ; Arduini, G (CERN) ; Argyropoulos, T (CERN) ; Bartosik, H (CERN) ; Calaga, R (CERN) ; Cornelis, K (CERN) ; Gilardoni, S (CERN) ; Métral, E (CERN) ; Mounet, N (CERN) ; Papaphilippou, Y (CERN) et al.
The beam coupling impedance could lead to limitations in beam brightness and quality, and therefore it needs accurate quantification and continuous monitoring in order to detect and mitigate high impedance sources. In the CERN machines, for example, kickers and collimators are expected to be important contributors to the total imaginary part of the transverse impedance. [...]
CERN-ACC-2013-0120.-
Geneva : CERN, 2013 - 3 p.
Fulltext: PDF;
In : 4th International Particle Accelerator Conference, Shanghai, China, 12 - 17 May 2013, pp.3106
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139.
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The mode matching method applied to beam coupling impedance calculations of finite length devices
/ Biancacci, N (CERN ; Rome U.) ; Vaccaro, VG (CERN ; Naples U.) ; Metral, E (CERN) ; Salvant, B (CERN) ; Migliorati, M (Rome U.) ; Palumbo, L (Rome U.)
The infinite length approximation is often used to simplify the calculation of the beam coupling impedance of accelerator elements. This is expected to be a reasonable assumption for devices whose length is greater than the transverse dimension but may be less accurate approximation for segmented devices. [...]
CERN-ATS-2012-187.-
Geneva : CERN, 2012 - 3 p.
- Published in : Conf. Proc.: C1205201 (2012) , pp. WEPPR062
Fulltext: PDF; External link: Published version from JaCoW
In : 3rd International Particle Accelerator Conference, New Orleans, LA, USA, 20 - 25 May 2012, pp.3069
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140.
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25 ns studies in the LHC – MD held on 14/10/2011
/ Arduini, G (CERN) ; Bartosik, H (CERN) ; Biancacci, N (CERN) ; Buffat, X (CERN) ; Dominguez, O (CERN) ; Iadarola, G (CERN) ; Métral, E (CERN) ; Rumolo, G (CERN) ; Salvant, B (CERN) ; Zannini, C (CERN) et al.
The machine development session (12 hours) was devoted to the injection of several trains of 72 bunches with nominal bunch population and 25 ns bunch spacing with the aim of injecting up to 1000 bunches/beam. [...]
CERN-ATS-Note-2012-042 MD.
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2012. - 22 p.
Full text
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141.
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Electron Cloud observation in the LHC
/ Rumolo, G (CERN) ; Arduini, G (CERN) ; Baglin, V (CERN) ; Bartosik, H (CERN) ; Biancacci, N (CERN) ; Baudrenghien, P (CERN) ; Bregliozzi, G (CERN) ; Chiggiato, P ; Claudet, S (CERN) ; De Maria, R (CERN) et al.
Operation of LHC with bunch trains at different spacings has revealed the formation of an electron cloud inside the machine. The main observations of electron cloud build up are the pressure rise measured at the vacuum gauges in the warm regions, as well as the increase of the beam screen temperature in the cold regions due to an additional heat load. [...]
CERN-ATS-2011-105.-
Geneva : CERN, 2011 - 3 p.
Fulltext: PDF; External link: Published version from JACoW
In : 2nd International Particle Accelerator Conference, San Sebastian, Spain, 4 - 9 Sep 2011, pp.THOBA01
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142.
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Impedance calculations for simple models of kickers in the non-ultrarelativistic regime
/ Biancacci, N (CERN ; Rome U.) ; Wang, N (Beijing, Inst. High Energy Phys.) ; Qin, Q (Beijing, Inst. High Energy Phys.) ; Métral, E (CERN) ; Mounet, N (CERN) ; Salvant, B (CERN) ; Zannini, C (CERN) ; Migliorati, M (Rome U.) ; Mostacci, A (Rome U.) ; Palumbo, L (Rome U.)
Kicker magnets are usually significant contributors to the beam coupling impedance of particle accelerators. An accurate understanding of their impedance is required in order to correctly assess the machine intensity limitations. [...]
CERN-ATS-2011-097.-
Geneva : CERN, 2011 - 4 p.
Fulltext: PDF; External link: Published version from JACoW
In : 2nd International Particle Accelerator Conference, San Sebastian, Spain, 4 - 9 Sep 2011, pp.MOPS073
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143.
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Localization of transverse impedance sources in the SPS using headtail macroparticle simulations
/ Biancacci, N (CERN ; Rome U.) ; Arduini, G (CERN) ; Métral, E (CERN) ; Quatraro, D (CERN) ; Rumolo, G (CERN) ; Salvant, B (CERN) ; Tomás, R (CERN) ; Calaga , R ; Migliorati, M (Rome U.) ; Palumbo, L (Rome U.)
In particle accelerators, the beam coupling impedance is one of the main contributors to instability phenomena that lead to particle losses and beam quality deterioration. For this reason these machines are continuously monitored and the global and local amount of impedance needs to be evaluated. [...]
CERN-ATS-2011-094.-
Geneva : CERN, 2011 - 4 p.
Fulltext: PDF; External link: Published version from JACoW
In : 2nd International Particle Accelerator Conference, San Sebastian, Spain, 4 - 9 Sep 2011, pp.MOPS068
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144.
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