CERN Accelerating science

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2018-05-26
06:12
The CERN/ISOLDE Laser Ion Source / Marsh, B A (CERN) ; Fedosseev, V N (CERN) ; Chrysalidis, K (CERN) ; Day Goodacre, T (CERN) ; Larmonier, P (CERN) ; Rossel, R E (CERN) ; Rothe, S (CERN) ; Seiffert, C (CERN) ; Wendt, K (Mainz U., Inst. Phys.)
Laser resonance photo-ionization an essential aspect of radioactive ion beam production for fundamental and applied physics research. The laser ion source of the ISOLDE facility, described here, is the most versatile of its type worldwide..
2017 - Published in : 10.1364/CLEO_SI.2017.SF1K.5 External link: Fulltext

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2018-05-25
07:03
Effects of the extraction voltage applied by the puller-electrode on the H$^−$ extraction in the Linac4 negative ion source / Abe, S (Keio U.) ; Nishioka, S (Keio U.) ; Mattei, S (CERN) ; Hatayama, A (Keio U.) ; Lettry, J (CERN)
In order to understand the H$^−$ extraction mechanism and investigate the effect of the extraction voltage applied by the puller-electrode on the H$^−$ extraction in the Linac4 negative ion source, we are developing a 2D3V-PIC (two dimensions in the real space and three dimensions in the velocity space, Particle in Cell) model with volume produced H$^−$ ions. It is shown that how to take the magnetic filter field direction is important for the 2D modeling to take into account the important 3D effect of electron $E \times B$ drift. [...]
2017 - 8 p. - Published in : AIP Conf. Proc. 1869 (2017) 030051
In : 5th International Symposium on Negative Ions, Beams and Sources, Oxford, United Kingdom, 12 - 16 Sep 2016, pp.030051

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2018-05-24
06:01
Numerical simulation of the RF plasma discharge in the Linac4 H$^−$ ion source / Mattei, S (CERN ; CRPP, Lausanne) ; Nishida, K (Keio U.) ; Onai, M (Keio U.) ; Lettry, J (CERN) ; Tran, M Q (CRPP, Lausanne) ; Hatayama, A (Keio U.)
This paper presents a Particle-In-Cell Monte Carlo Collision simulation of the Radio-Frequency (RF) plasma heating in the Linac4 H$^−$ ion source at CERN. The model self-consistently takes into account the electromagnetic field generated by the RF coil, the external static magnetic fields and the resulting plasma response, including a kinetic description of the charged species (e$^−$, H$^+$, H$^+_2$, H$^+_3$, H$^−$), as well as the atomic and molecular (vibrationally resolved) populations. [...]
2017 - 7 p. - Published in : AIP Conf. Proc. 1869 (2017) 030018
In : 5th International Symposium on Negative Ions, Beams and Sources, Oxford, United Kingdom, 12 - 16 Sep 2016, pp.030018

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2018-05-24
06:01
Influence of the cusp field on the plasma parameters of the Linac4 H− ion source / Briefi, S (U. Augsburg (main)) ; Mattei, S (CERN) ; Lettry, J (CERN) ; Fantz, U (U. Augsburg (main) ; Garching, Max Planck Inst. Plasmaphys.)
When the H$^−$ ion source of CERN’s Linac4 is operated in volume mode, a maximum of the extracted current is obtained at varying RF power. The power required for this maximum and its absolute value is strongly influenced by the cusp magnets installed at the source for electron confinement: without magnets, 15−20 mA are typically obtained at 20 kW whereas with magnets a factor of two more power is needed and 25−30 mA are achieved. [...]
2017 - 10 p. - Published in : AIP Conf. Proc. 1869 (2017) 030016
In : 5th International Symposium on Negative Ions, Beams and Sources, Oxford, United Kingdom, 12 - 16 Sep 2016, pp.030016

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2018-05-23
06:00
Autopilot regulation for the Linac4 H$^−$ ion source / Voulgarakis, G (CERN) ; Lettry, J (CERN) ; Mattei, S (CERN) ; Lefort, B (CERN) ; Correia Costa, V J (CERN)
Linac4 is a 160 MeV H$^−$ linear accelerator part of the upgrade of the LHC injector chain. Its cesiated surface H$^−$ source is designed to provide a beam intensity of 40-50mA. [...]
2017 - 11. - Published in : AIP Conf. Proc. 1869 (2017) 030012
In : 5th International Symposium on Negative Ions, Beams and Sources, Oxford, United Kingdom, 12 - 16 Sep 2016, pp.030012

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2018-05-15
06:02
ISOLDE: Targeting a New Era in Nuclear Physics / Ravn, Helge (CERN)
2017 - 4 p. - Published in : Adv. Ser. Direct. High Energy Phys.: 27 (2017) , pp. 77-80 Fulltext: PDF;

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2018-05-12
06:31
First experience with carbon stripping foils for the 160 MeV H− injection into the CERN PSB / Weterings, Wim (CERN) ; Bracco, Chiara (CERN) ; Jorat, Louise (CERN) ; Noulibos, Remy (CERN) ; van Trappen, Pieter (CERN)
160 MeV H− beam will be delivered from the new CERN linear accelerator (Linac4) to the Proton Synchrotron Booster (PSB), using a H− charge-exchange injection system. A 200 µg/cm2 carbon stripping foil will convert H− into protons by stripping off the electrons. [...]
2018 - Published in : AIP Conf. Proc. 1962 (2018) 030003 Preprint: PDF;
In : 28th World Conference of the International Nuclear Target Development Society, Cape Town, South Africa, 13 - 18 Nov 2016, pp.030003

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2018-05-03
06:11
Emittance measurements in low energy ion storage rings / Hunt, J R (Cockcroft Inst. Accel. Sci. Tech.) ; Carli, C (CERN) ; Resta-López, J (Cockcroft Inst. Accel. Sci. Tech.) ; Welsch, C P (Cockcroft Inst. Accel. Sci. Tech.)
The development of the next generation of ultra-low energy antiproton and ion facilities requires precise information about the beam emittance to guarantee optimum performance. [...]
2018. - 13 p.
Full text

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2018-05-01
07:09
The n_TOF facility: Neutron beams for challenging future measurements at CERN / Chiaveri, E (CERN ; U. Manchester (main) ; Seville U.) ; Aberle, O (CERN) ; Andrzejewski, J ; Audouin, L ; Bacak, M (CERN ; TU Vienna ; IRFU, Saclay) ; Balibrea, J ; Barbagallo, M ; Bečvář, F ; Berthoumieux, E ; Billowes, J et al.
The CERN n_TOF neutron beam facility is characterized by a very high instantaneous neutron flux, excellent TOF resolution at the 185 m long flight path (EAR-1), low intrinsic background and coverage of a wide range of neutron energies, from thermal to a few GeV. These characteristics provide a unique possibility to perform high-accuracy measurements of neutron-induced reaction cross-sections and angular distributions of interest for fundamental and applied Nuclear Physics. [...]
2017 - 4 p. - Published in : EPJ Web Conf. 146 (2017) 03001 Fulltext: PDF; External link: Fulltext
In : ND 2016 International Conference on Nuclear Data for Science and Technology, Bruges, Belgium, 11 - 16 Sep 2016, pp.03001

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2018-04-23
09:05
Proposal for a Simplified Management of Accelerator Settings in the Injector Complex Based on Automatic Setting Propagation / Damerau, Heiko (CERN)
With the increasing number of beams with different characteristics the number of controls settings to pilot the accelerator hardware has grown proportionally. [...]
CERN-ACC-NOTE-2018-0037.
- 2018. - 6 p.

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