CERN Accelerating science

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1.
The CERN SPS Low Level RF upgrade project / Hagmann, Gregoire (CERN) ; Baudrenghien, Philippe (CERN) ; Betz, Jochen (CERN) ; Egli, Julien (CERN) ; Galindo Guarch, Francisco Javier (Barcelona, Polytechnic U.) ; Kotzian, Gerd (CERN) ; Rizzi, Mattia (CERN) ; Schmid, Lorenz (CERN) ; Spierer, Arthur (CERN) ; Włostowski, Tomasz (CERN)
The High Luminosity LHC project (HL-LHC) calls for the doubling of the beam intensity injected from the Super Proton Synchrotron (SPS). This is not possible with the present RF system consisting of four 200 MHz cavities. [...]
CERN-ACC-2019-124.- 2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-THPRB082 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.THPRB082
2.
Compensation of Transient Beam Loading in Ramping Synchrotrons Using a Fixed Frequency Processing Clock / Galindo Guarch, Francisco Javier (Barcelona, Polytechnic U. ; CERN) ; Baudrenghien, Philippe (CERN) ; Moreno Arostegui, Juan Manuel (Barcelona, Polytechnic U.)
Transient beam loading compensation schemes, such as One-Turn-FeedBack (OTFB), require beam synchronous processing (BSP). Swept clocks derived from the RF, and therefore harmonic to the revolution frequency, are widely used in CERN synchrotrons; this simplifies implementation with energy ramping, where the revolution frequency changes. [...]
2018 - 4 p. - Published in : (2018) , pp. THPML121
- Published in : J. Phys.: Conf. Ser. 1067 (2018) 072033 Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.THPML121
3.
Luminosity Reduction Caused by the Full-Detuning LLRF Scheme on the HL-LHC Crab Cavities / Yamakawa, Emi (Lancaster U.) ; Apsimon, Robert (Lancaster U.) ; Baudrenghien, Philippe (CERN) ; Calaga, Rama (CERN) ; Dexter, Amos (Lancaster U.) ; Galindo Guarch, Francisco Javier (CERN)
The High-Luminosity LHC (HL-LHC) crab cavities (CCs) will be installed on both sides of IP1 (ATLAS) and IP5 (CMS) to compensate for the geometric luminosity reduction due to the crossing angle. To cope with the increased beam current (0.55 A DC for LHC, 1.1 A for HL-LHC), the operation of the LLRF system has been changed: rather than fully compensating the transient beam loading, we allow the phase to vary along the turn (100 ps peak-peak with 1.1 A DC). [...]
CERN-ACC-2018-117.- 2018 - 4 p. - Published in : 10.18429/JACoW-IPAC2018-MOPMF022 Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.MOPMF022

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