CERN Accelerating science

PS Complex

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2018-11-06
06:56
Higher-Harmonic RF System for Landau Damping in the CERN PS / Damerau, Heiko (CERN) ; Lasheen, Alexandre (CERN) ; Shaposhnikova, Elena (CERN)
Longitudinal coupled-bunch instabilities after transition crossing and at the flat-top limit the intensity of LHC-type beams in the CERN Proton Synchrotron (PS). A dedicated coupled-bunch feedback for dipole oscillation modes, using a Finemet cavity as wide-band longitudinal kicker, suppresses the instabilities up to an intensity of about 2·10¹¹ particles per bunch at extraction. [...]
2018 - 4 p. - Published in : 10.18429/JACoW-IPAC2018-TUPAF026 Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.TUPAF026

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2018-11-06
06:56
RF Manipulations for Special LHC-Type Beams in the CERN PS / Damerau, Heiko (CERN) ; Hancock, Steven (CERN) ; Lasheen, Alexandre (CERN) ; Perrelet, Damien (CERN)
Beams with special longitudinal characteristics for the Large Hadron Collider (LHC) have been produced in the Proton Synchrotron (PS) and CERN. The flexibility of its RF systems consisting of in total 25 RF cavities at frequencies from 400 kHz to 200 MHz allows a variety of longitudinal beam manipulations. [...]
2018 - 4 p. - Published in : 10.18429/JACoW-IPAC2018-WEPAF063 Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.WEPAF063

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2018-11-06
06:56
Improvement of the Longitudinal Beam Transfer from PS to SPS at CERN / Lasheen, Alexandre (CERN) ; Damerau, Heiko (CERN) ; Repond, Joël (CERN) ; Schwarz, Markus (CERN) ; Shaposhnikova, Elena (CERN)
The beam transfer from the Proton Synchrotron (PS) to the Super Proton Synchrotron (SPS) at CERN is a critical process for the production of beams for the Large Hadron Collider (LHC). A bunch-to-bucket transfer is performed with the main drawback that the rf frequency in the SPS (200 MHz) is five times higher than the one in the PS (40 MHz). [...]
2018 - 4 p. - Published in : 10.18429/JACoW-IPAC2018-THPAF042 Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.THPAF042

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2018-11-06
06:56
Uncontrolled Longitudinal Emittance Blow-Up during RF Manipulations in the CERN PS / Lasheen, Alexandre (CERN) ; Damerau, Heiko (CERN) ; Favia, Giorgia (CERN)
The CERN Proton Synchrotron (PS) determines the basic bunch spacing for the Large Hadron Collider (LHC) by means of rf manipulations. Several rf systems in a frequency range from 2.8 MHz to 200 MHz are available for beam acceleration and manipulations. [...]
2018 - 7 p. - Published in : (2018) , pp. THPAF041
- Published in : J. Phys. : Conf. Ser.: 1067 (2018) , no. 6, pp. 062018 Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.THPAF041

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2018-11-06
06:56
Impedance Analysis of New PS Internal Dump Design / Popovic, Branko (CERN) ; Teofili, Lorenzo (CERN) ; Vollinger, Christine (CERN)
The High Luminosity Large Hadron Collider (HL-LHC) project at CERN calls for increasing beam intensity in the injector chain. In the Proton Synchrotron (PS), a pre-injector of the LHC, these intensities can result in beam instabilities and potential RF heating of machine components, such that impedance mitigation measures are required. [...]
2018 - 4 p. - Published in : 10.18429/JACoW-IPAC2018-THPAF052 Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.THPAF052

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2018-11-06
06:56
Beam Impedance Evaluation for CERN PS Gate Valves by Simulation and Benchmark Measurement / Popovic, Branko (CERN) ; Vollinger, Christine (CERN)
The CERN High Luminosity LHC project calls for a doubling of beam intensity which requires a clear identification of possible longitudinal instability sources in the injector chain. This requirement yields the need to further improve the longitudinal impedance model for the Proton Synchrotron (PS). [...]
2018 - 3 p. - Published in : 10.18429/JACoW-IPAC2018-THPAF051 Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.THPAF051

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2018-10-29
16:38
Validation of LNE51 AEGIS Transfer Line Optics and Electrostatic Deflector / Bass, Rachel Miranda ; Fraser, Matthew Alexander (CERN)
It is proposed to move the Antihydrogen Experiment: Gravity, Interferometry, Spectroscopy (AE-GIS) from its current location to another area within the Antiproton Decelerator (AD) hall. [...]
CERN-ACC-NOTE-2018-0069.
- 2018. - 15 p.
Full text

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2018-10-18
09:02
Distributed Optical Fiber Radiation Sensing in the Proton Synchrotron Booster at CERN / Di Francesca, D (CERN) ; Toccafondo, I (CERN) ; Li Vecchi, G (CERN ; Lab. Hubert Curien, St. Etienne) ; Calderini, S (CERN) ; Girard, S (Lab. Hubert Curien, St. Etienne) ; Alessi, A (Lab. Hubert Curien, St. Etienne) ; Ferraro, R (CERN) ; Danzeca, S (CERN) ; Kadi, Y (CERN) ; Brugger, M (CERN)
In this paper, we report on the development and first deployment of a distributed optical fiber radiation sensor (DOFRS) for the online monitoring of radiation levels in the high-energy accelerator facilities of CERN. The DOFRS is composed of two basic parts: a set of suitably chosen radiation sensitive optical fibers (OFs), to be installed in the machine tunnel, and an optical time domain reflectometer (OTDR), to be installed in a radiation-free area. [...]
2018 - 6 p. - Published in : IEEE Trans. Nucl. Sci. 65 (2018) 1639-1644

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2018-10-18
09:02
Metrological Characterization of Nuclear Magnetic Resonance Markers for Real-Time Field Control of the CERN ELENA Ring Dipoles / Grech, Christian (CERN ; U. Malta) ; Avramidou, Rachel (CERN ; U. Derby) ; Beaumont, Anthony (CERN ; Ecole Polytechnique, Lausanne) ; Buzio, Marco (CERN) ; Sammut, Nicholas (U. Malta) ; Tinembart, Jacques (METROLAB, Geneva)
Field markers in particle accelerators are used to provide a digital trigger when the magnetic field reaches a preset threshold. This paper describes the results of a test campaign performed on the extra low energy antiproton decelerator's main bending dipoles at the European Organization for Nuclear Research (CERN) investigating the behavior of nuclear magnetic resonance (NMR) markers in ramping fields. [...]
2018 - 8 p. - Published in : IEEE Sensors J. 18 (2018) 5826-5833

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2018-10-16
12:14
Beam Dynamics Studies for a Fast Dump System employing a Fixed Absorber Block in the CERN PS / Arrutia Sota, Pablo Andreas
Mechanical internal dumps are used at the Proton Synchrotron (PS) to dispose of the circulating beam. [...]
CERN-ACC-NOTE-2018-0068.
- 2018. - 25 p.
Full text

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