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Improvements to the LHC Schottky Monitors
/ Wendt, Manfred (CERN) ; Betz, Michael (CERN) ; Jones, Owain Rhodri (CERN) ; Lefèvre, Thibaut (CERN) ; Levens, Thomas (CERN)
The LHC Schottky monitors have the potential to measure and monitor some important beam parameters, e.g. tune, momentum spread, chromaticity and emittance, in a non-invasive way. [...]
2017 - 4 p.
- Published in : 10.18429/JACoW-IBIC2016-TUPG46
Fulltext: PDF;
In : International Beam Instrumentation Conference, Barcelona, Spain, 11 - 15 Sep 2016, pp.TUPG46
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Status of the tune and orbit measurements and corrections and testing strategy
/ Andersen, M (CERN) ; Baud, G (CERN) ; Betz, M (CERN) ; Boccard, C (CERN) ; Boccardi, A (CERN) ; Calvo, E (CERN) ; Fullerton, J (CERN) ; Gasior, M (CERN) ; Jackson, S (CERN) ; Jensen, L (CERN) et al.
An upgrade of LHC beam instrumentation has been performed during the Long
Shutdown 1. In this context both the beam position and tune monitoring systems,
as well as their respective feedback systems have been reviewed and modified.
This contribution presents an overview of the major hardware and software
modifications performed during LS1 and the expected performance with 6.5TeV
beams in 2015..
Geneva : CERN, 2014 - 4 p.
- Published in : (2014) , pp. 153-156
Fulltext: PDF;
In : 5th Evian Workshop on LHC beam operation, Evian-les-Bains, France, 2 - 4 Jun 2014, pp.153-156
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New ideas for axion like particle dark matter search
Reference: Poster-2016-543
Note: Presented as part of the talk "Cross-disciplinary axion <--> chameleon detection + ID" by K. Zioutas.
Keywords: Axion ALP Hidden Photon Wiggler Dark Matter Tore Supra Toroidal mode Cavity
Created: 2012. -17 p
Creator(s): Betz, Michael; Caspers, Fritz; Zioutas, Konstantin
In the context of finding suitable large magnets for RF and microwave axion search, the Tore supra ring had been proposed. This Tokamak which could probably be made available for DM search has a huge volume and a strong magnetic field (30000 liter and 4.5 Tesla). It appears on a first glance, as an interesting candidate for this kind of experiment. One can find a suitable microwave mode which meets the condition that the RF electric field is parallel to the magnetostatic field. The eigenfrequency field pattern and Q factor for this mode and a few adjacent ones are calculated the some field patterns shown graphically. The use of the torus type cavity is not restricted to the Tore Supra. It can in principle be applied to any torus type structure also scaled up toward smaller dimensions and higher frequencies. In the second part of the slide presentation some alternatives and other cavity magnet concepts are shown and discussed.
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© CERN Geneva
Access to files
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6.
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An update on the Axion Helioscopes front: current activities at CAST and the IAXO project
/ Dafni, T (Zaragoza U.) ; Arik, M (Dogus U., Kadikoy) ; Armengaud, E (IRFU, SPhN, Saclay) ; Aune, S (IRFU, Saclay) ; Avignone, F T (South Carolina U.) ; Barth, K (CERN) ; Belov, A (Moscow, INR) ; Betz, M (CERN) ; Bräuninger, H (Garching, Max Planck Inst., MPE) ; Brax, P (CERN) et al.
Although they have not yet been detected, axions and axion-like particles (ALPs) continue to maintain the interest (even increasingly so) of the rare-event searches community as viable candidates for the Dark Matter of the Universe but also as a solution for several other puzzles of astrophysics. Their property of coupling to photons has inspired different experimental methods for their detection, one of which is the helioscope technique. [...]
2016 - 6 p.
- Published in : Nucl. Part. Phys. Proc. 273-275 (2016) 244-249
In : 37th International Conference on High Energy Physics, Valencia, Spain, 2 - 9 Jul 2014, pp.244-249
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7.
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MD 400: LHC emittance growth in presence of an external source of noise during collision
/ Barranco Garcia, Javier (Ecole Polytechnique Federale de Lausanne (CH)) ; Buffat, Xavier (CERN) ; Pieloni, Tatiana (CERN) ; Tambasco, Claudia (Ecole Polytechnique Federale de Lausanne (CH)) ; Trad, Georges (CERN) ; Valuch, Daniel (CERN) ; Betz, Michael (CERN) ; Wendt, Manfred (CERN) ; Pojer, Mirko (CERN) ; Solfaroli Camillocci, Matteo (CERN) et al.
The interplay between head-on beam-beam interaction and external sources of noise can be a significant source of emittance growth, especially when considering large beam-beam tune shifts as for the HL-LHC upgrade project. [...]
CERN-ACC-NOTE-2016-0020.
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2016. - 9 p.
Full text
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The IAXO Helioscope
/ Ferrer Ribas, E. (IRFU, Saclay) ; Armengaud, E. (IRFU, Saclay) ; Avignone, F.T. (South Carolina U.) ; Betz, M. (CERN) ; Brax, P. (IPhT, Saclay) ; Brun, P. (IRFU, Saclay) ; Cantatore, G. (INFN, Trieste ; Trieste U.) ; Carmona, J.M. (Zaragoza U.) ; Carosi, G.P. (LLNL, Livermore) ; Caspers, F. (CERN) et al.
The IAXO (International Axion Experiment) is a fourth generation helioscope with a sensitivity, in terms of detectable signal counts, at least 10(4) better than CAST phase-I, resulting in sensitivity on g(a)(γ) one order of magnitude better. To achieve this performance IAXO will count on a 8-coil toroidal magnet with 60 cm diameter bores and equipped with X-ray focusing optics into 0.20 cm(2) spots coupled to ultra-low background Micromegas X-ray detectors. [...]
2015 - 8 p.
- Published in : J. Phys.: Conf. Ser. 650 (2015) 012009
IOP Open Access article: PDF;
In : 7th Symposium on large TPCs for low-energy rare event detection, Paris, France, 15 - 17 Dec 2014, pp.012009
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The Next Generation of Axion Helioscopes: The International Axion Observatory (IAXO)
/ Vogel, J K (LLNL, Livermore) ; Armengaud, E (IRFU, Saclay) ; Avignone, F T (South Carolina U.) ; Betz, M (CERN) ; Brax, P (IRFU, Saclay) ; Brun, P (IRFU, Saclay) ; Cantatore, G (INFN, Trieste ; Trieste U.) ; Carmona, J M (Zaragoza U.) ; Carosi, G P (LLNL, Livermore) ; Caspers, F (CERN) et al.
The International Axion Observatory (IAXO) is a proposed 4 th -generation axion helioscope with the primary physics research goal to search for solar axions via their Primakoff conversion into photons of 1 – 10 keV energies in a strong magnetic field. IAXO will achieve a sensitivity to the axion-photon coupling g aγ down to a few ×10 −12 GeV −1 for a wide range of axion masses up to ∼ 0 . [...]
2015 - 8 p.
- Published in : Phys. Procedia 61 (2015) 193-200
Elsevier Open Access article: PDF;
In : 13th International Conference on Topics in Astroparticle and Underground Physics, Asilomar, CA, USA, 8 - 13 Sep 2013, pp.193-200
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