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• Aghion, Stefano; Amsler, Claude; Ariga, Akitaka; Ariga, Tomoko; Bonomi, Germano & Bräunig, Philippe [Show all 72 contributors for this article] (2017). Measurement of antiproton annihilation on Cu, Ag and Au with emulsion films. Journal of Instrumentation (JINST). 12:P04021(4), p. 1–12. doi: 10.1088/1748-0221/12/04/P04021. Full text in Research Archive
• Brusa, Roberto S.; Amsler, Claude; Ariga, Tomoko; Bonomi, Germano; Bräunig, Philippe & Cabaret, Louis [Show all 64 contributors for this article] (2017). The AEgIS experiment at CERN: Measuring antihydrogen free-fall in earth's gravitational field to test WEP with antimatter. Journal of Physics: Conference Series (JPCS). ISSN 1742-6588. 791:012014(1), p. 1–9. doi: 10.1088/1742-6596/791/1/012014. Full text in Research Archive
• Aghion, Stefano; Amsler, Claude; Ariga, Akitaka; Ariga, Tomoko; Bonomi, Germano & Bräunig, Philippe [Show all 82 contributors for this article] (2016). Laser excitation of the n=3 level of positronium for antihydrogen production. Physical Review A. Atomic, Molecular, and Optical Physics (PRA). ISSN 1050-2947. 94:012507. doi: 10.1103/PhysRevA.94.012507. Full text in Research Archive
• Pacifico, Nicola; Aghion, Stefano; Alozy, J; Amsler, C; Ariga, A & Ariga, T [Show all 80 contributors for this article] (2016). Direct detection of antiprotons with the Timepix3 in a new electrostatic selection beamline. Nuclear Instruments and Methods in Physics Research Section A : Accelerators, Spectrometers, Detectors and Associated Equipment. ISSN 0168-9002. 831, p. 12–17. doi: 10.1016/j.nima.2016.03.057. Full text in Research Archive
• Caravita, Ruggero; Aghion, S; Amsler, C; Ariga, A; Ariga, T & Bonomi, G [Show all 83 contributors for this article] (2016). Towards a gravity measurement on cold antimatter atoms. Nuovo cimento della societa italiana de fisica. C, Geophysics and space physics. ISSN 1124-1896. 39:237. doi: 10.1393/ncc/i2016-16237-6. Full text in Research Archive
• Mariazzi, Sebastiano; Caravita, Ruggero; Aghion, Stefano; Amsler, Claude; Ariga, Akitaka & Ariga, Tomoko [Show all 83 contributors for this article] (2016). Positron manipulation and positronium laser excitation in AEgIS. Defect and Diffusion Forum. ISSN 1012-0386. 373 DDF, p. 11–16. doi: 10.4028/www.scientific.net/DDF.373.11. Full text in Research Archive
• Kellerbauer, Alban; Aghion, S; Amsler, C; Ariga, A; Ariga, T & Bonomi, G [Show all 77 contributors for this article] (2016). Probing antimatter gravity - The AEGIS experiment at CERN. The European Physical Journal Conferences. ISSN 2101-6275. 126:02016, p. 1–10. doi: 10.1051/epjconf/201612602016. Full text in Research Archive
• Testera, Gemma; Aghion, S; Amsler, C; Ariga, A; Ariga, T & Belov, A [Show all 75 contributors for this article] (2015). The AEgIS experiment. Hyperfine Interactions. ISSN 0304-3843. 233(1-3), p. 13–20. doi: 10.1007/s10751-015-1165-5. Full text in Research Archive
• Consolati, Giovanni; Aghion, Stefano; Amsler, Claude; Ariga, Akitaka; Ariga, Tomoko & Belov, Alexandre S. [Show all 73 contributors for this article] (2015). Experiments with low-energy antimatter. The European Physical Journal Conferences. ISSN 2101-6275. 96:01007, p. 1–7. doi: 10.1051/epjconf/20159601007. Full text in Research Archive
• Kimura, Mitsuhiro; Aghion, S; Amsler, C; Ariga, A; Ariga, T & Belov, A [Show all 73 contributors for this article] (2015). Testing the Weak Equivalence Principle with an antimatter beam at CERN. Journal of Physics: Conference Series (JPCS). ISSN 1742-6588. 631. doi: 10.1088/1742-6596/631/1/012047. Full text in Research Archive
• Aghion, Stefano; Amsler, C; Ariga, A; Ariga, T; Belov, AS & Bonomi, G [Show all 82 contributors for this article] (2015). Positron bunching and electrostatic transport system for the production and emission of dense positronium clouds into vacuum. Nuclear Instruments and Methods in Physics Reseach B. ISSN 0168-583X. 362, p. 86–92. doi: 10.1016/j.nimb.2015.08.097. Full text in Research Archive Show summary

  We describe a system designed to re-bunch positron pulses delivered by an accumulator supplied by a positron source and a Surko-trap. Positron pulses from the accumulator are magnetically guided in a 0.085 T field and are injected into a region free of magnetic fields through a μμ-metal field terminator. Here positrons are temporally compressed, electrostatically guided and accelerated towards a porous silicon target for the production and emission of positronium into vacuum. Positrons are focused in a spot of less than 4 mm FWTM in bunches of ∼8 ns FWHM. Emission of positronium into the vacuum is shown by single shot positron annihilation lifetime spectroscopy.

• Pistillo, Ciro; Aghion, S; Amsler, C; Ariga, A; Ariga, T & Belov, A [Show all 72 contributors for this article] (2015). Emulsion detectors for the antihydrogen detection in AEgIS. Hyperfine Interactions. ISSN 0304-3843. 233(1-3), p. 29–34. doi: 10.1007/s10751-015-1175-3. Full text in Research Archive
• Storey, James William; Aghion, Stefano; Amsler, Claude; Ariga, Akitaka; Ariga, Tomoko & Belov, Alexander Stepanovich [Show all 73 contributors for this article] (2015). Particle tracking at cryogenic temperatures: The Fast Annihilation Cryogenic Tracking (FACT) detector for the AEgIS antimatter gravity experiment. Journal of Instrumentation (JINST). 10(2), p. 1–11. doi: 10.1088/1748-0221/10/02/C02023. Full text in Research Archive
• Scampoli, Paola; Aghion, S; Ahlen, O; Amsler, C; Ariga, A & Ariga, T [Show all 69 contributors for this article] (2014). Development of nuclear emulsions operating in vacuum for the AEgIS experiment. Journal of Instrumentation (JINST). 9(1). doi: 10.1088/1748-0221/9/01/C01061. Full text in Research Archive
• Vásquez, Martin Alfonso Subieta; Aghion, S; Ahlen, O; Amsler, C; Ariga, A & Ariga, T [Show all 70 contributors for this article] (2014). AEgIS experiment: Measuring the acceleration g of the earth's gravitational field on antihydrogen beam. The European Physical Journal Conferences. ISSN 2101-6275. 71:00128. doi: 10.1051/epjconf/20147100128. Full text in Research Archive
• Aghion, Stefano; Ahlen, O; Belov, AS; Bonomi, G; Braunig, P & Bremer, J [Show all 59 contributors for this article] (2014). Detection of low energy antiproton annihilations in a segmented silicon detector. Journal of Instrumentation (JINST). 9(6). doi: 10.1088/1748-0221/9/06/P06020. Full text in Research Archive Show summary

  The goal of the AEḡIS experiment at the Antiproton Decelerator (AD) at CERN, is to measure directly the Earth’s gravitational acceleration on antimatter by measuring the free fall of a pulsed, cold antihydrogen beam. The final position of the falling antihydrogen will be detected by a position sensitive detector. This detector will consist of an active silicon part, where the annihilations take place, followed by an emulsion part. Together, they allow to achieve 1% precision on the measurement of ḡ with about 600 reconstructed and time tagged annihilations. We present here the prospects for the development of the AEḡIS silicon position sentive detector and the results from the first beam tests on a monolithic silicon pixel sensor, along with a comparison to Monte Carlo simulations.

• Gligorova, Angela; Aghion, Stefano; Belov, Alexander Stepanovich; Bonomi, Germano; Bräunig, Philippe & Bremer, Johannes [Show all 60 contributors for this article] (2014). Comparison of planar and 3d silicon pixel sensors used for detection of low energy antiprotons. IEEE Transactions on Nuclear Science. ISSN 0018-9499. 61(6), p. 3747–3753. doi: 10.1109/TNS.2014.2368591. Full text in Research Archive Show summary

  The principle aim of the AEḡIS experiment at CERN is to measure the acceleration of antihydrogen due to Earth’s gravitational field. This would be a test of the Weak Equivalence Principle, which states that all bodies fall with the same acceleration independently of their mass and composition. The effect of Earth’s gravitational field on antimatter will be determined by measuring the deflection of the path of the antihydrogen from a straight line. The position of the antihydrogen will be found by detecting its annihilation on the surface of a silicon detector. The gravitational measurement in AEḡIS will be performed with a gravity module, which includes the silicon detector, an emulsion detector and a scintillating fibre time-offlight detector. As the experiment attempts to determine the gravitational acceleration with a precision of 1 %, a position resolution better than 10 μm is required. Here we present the results of a study of antiproton annihilations in a 3D silicon pixel sensor and compare the results with a previous study using a monolithic active pixel sensor. This work is part of a larger study on different silicon sensor technologies needed for the development of a silicon position detector for the AEḡIS experiment. The 3D detector together with its readout electronics have been originally designed for the ATLAS detector at the LHC. The direct annihilation of low energy antiprotons (∼ 100 keV) takes place in the first few μm of the silicon sensor and we show that the charged products of the annihilation can be detected with the same sensor. The present study also aims to understand the signature of an antiproton annihilation event in segmented silicon detectors and compares it with a GEANT4 simulation model. These results will be used to determine the geometrical and process parameters to be adopted by the silicon annihilation detector to be installed in AEḡIS.

• Pacifico, Nicola; Aghion, Stefano; Ahlen, O; Belov, AS; Bonomi, G & Bräunig, P [Show all 67 contributors for this article] (2014). Investigation of silicon sensors for their use as antiproton annihilation detectors. Nuclear Instruments and Methods in Physics Research Section A : Accelerators, Spectrometers, Detectors and Associated Equipment. ISSN 0168-9002. 765, p. 161–166. doi: 10.1016/j.nima.2014.06.036. Full text in Research Archive
• Aghion, Stefano; Ahlen, O; Amsler, C; Ariga, A; Ariga, T & Belov, AS [Show all 70 contributors for this article] (2014). A moiré deflectometer for antimatter. Nature Communications. 5. doi: 10.1038/ncomms5538. Full text in Research Archive Show summary

  The precise measurement of forces is one way to obtain deep insight into the fundamental interactions present in nature. In the context of neutral antimatter, the gravitational interaction is of high interest, potentially revealing new forces that violate the weak equivalence principle. Here we report on a successful extension of a tool from atom optics—the moiré deflectometer—for a measurement of the acceleration of slow antiprotons. The setup consists of two identical transmission gratings and a spatially resolving emulsion detector for antiproton annihilations. Absolute referencing of the observed antimatter pattern with a photon pattern experiencing no deflection allows the direct inference of forces present. The concept is also straightforwardly applicable to antihydrogen measurements as pursued by the AEgIS collaboration. The combination of these very different techniques from high energy and atomic physics opens a very promising route to the direct detection of the gravitational acceleration of neutral antimatter.

• Storey, James; Aghion, S; Ahlen, O; Amsler, C; Ariga, A & Ariga, T [Show all 71 contributors for this article] (2014). Measuring the gravitational free-fall of antihydrogen. Hyperfine Interactions. ISSN 0304-3843. 228(1-3), p. 151–157. doi: 10.1007/s10751-014-1055-2. Full text in Research Archive
• Aaij, Roel; Affolder, A; Akiba, K; Alexander, M; Ali, S & Appleby, RB [Show all 103 contributors for this article] (2014). Performance of the LHCb Vertex Locator. Journal of Instrumentation (JINST). 9:P09007(9). doi: 10.1088/1748-0221/9/09/P09007. Full text in Research Archive
• Knecht, Andreas; Aghion, S; Ahlen, O; Amsler, C; Ariga, A & Ariga, T [Show all 71 contributors for this article] (2014). The AEgIS Experiment. Hyperfine Interactions. ISSN 0304-3843. 228(131), p. 121–1-3. doi: 10.1007/s10751-014-1057-0. Full text in Research Archive
• Nellist, Clara; Gligorova, Angela; Huse, Torkjell; Pacifico, Nicola & Sandaker, Heidi (2013). Beam test results of 3D silicon pixel sensors for future upgrades. Nuclear Instruments and Methods in Physics Research Section A : Accelerators, Spectrometers, Detectors and Associated Equipment. ISSN 0168-9002. 732, p. 141–145. doi: 10.1016/j.nima.2013.07.002. Full text in Research Archive
• Kimura, M; Aghion, S; Ahlen, O; Amsler, Claude; Ariga, A & Ariga, T [Show all 67 contributors for this article] (2013). Development of nuclear emulsions with 1 mu m spatial resolution for the AEgIS experiment. Nuclear Instruments and Methods in Physics Research Section A : Accelerators, Spectrometers, Detectors and Associated Equipment. ISSN 0168-9002. 732, p. 325–329. doi: 10.1016/j.nima.2013.04.082. Full text in Research Archive
• Aghion, S; Ahlen, O; Amsler, Claude; Ariga, A; Ariga, T & Belov, AS [Show all 70 contributors for this article] (2013). Prospects for measuring the gravitational free-fall of antihydrogen with emulsion detectors. Journal of Instrumentation (JINST). 8. doi: 10.1088/1748-0221/8/08/P08013. Full text in Research Archive
• Storey, James; Canali, C; Aghion, S; Ahlen, O; Amsler, C & Ariga, A [Show all 70 contributors for this article] (2013). Particle tracking at 4 K: The Fast Annihilation Cryogenic Tracking (FACT) detector for the AEgIS antimatter gravity experiment. Nuclear Instruments and Methods in Physics Research Section A : Accelerators, Spectrometers, Detectors and Associated Equipment. ISSN 0168-9002. 732, p. 437–441. doi: 10.1016/j.nima.2013.05.130. Full text in Research Archive
• Abdesselam, A; Huse, Torkjell; Allport, PP; Øye, Ola Kristoffer; Pernegger, Heinz & Anastopoulos, C [Show all 361 contributors for this article] (2008). The integration and engineering of the ATLAS SemiConductor Tracker Barrel. Journal of Instrumentation (JINST). 3. doi: 10.1088/1748-0221/3/10/P10006. Full text in Research Archive
• Abdesselam, Abdel; Danielsen, Kjell Martin; Allport, PP; Anderson, B; Dorholt, Ole & Andricek, L [Show all 368 contributors for this article] (2008). Engineering for the ATLAS SemiConductor Tracker (SCT) End-cap. Journal of Instrumentation (JINST). 3(5). Full text in Research Archive
• Abdesselam, A; Adkin, PJ; Allport, PP; Alonso, J; Andricek, L & Anghinolfi, F [Show all 323 contributors for this article] (2007). The ATLAS semiconductor tracker end-cap module. Nuclear Instruments and Methods in Physics Research Section A : Accelerators, Spectrometers, Detectors and Associated Equipment. ISSN 0168-9002. 575(3), p. 353–389. doi: 10.1016/j.nima.2007.02.019. Full text in Research Archive
• Abdesselam, A.; Akimoto, T.; Allport, P.P.; Alonso, J.; Anderson, B. & Andricek, L [Show all 17 contributors for this article] (2006). The barrel modules of the ATLAS semiconductor tracker. Nuclear Instruments and Methods in Physics Research Section A : Accelerators, Spectrometers, Detectors and Associated Equipment. ISSN 0168-9002. 568, p. 642–671. Full text in Research Archive
• Abdesselam, A.; Akimoto, T.; Allport, P. P.; Alonso, J.; Anderson, B. & Andricek, L. [Show all 264 contributors for this article] (2006). The barrel modules of the ATLAS semiconductor tracker. Nuclear Instruments and Methods in Physics Research Section A : Accelerators, Spectrometers, Detectors and Associated Equipment. ISSN 0168-9002. 568(2), p. 642–671. Full text in Research Archive
• Campabadal, F; Fleta, C; Key, M; Lozano, M; Martinez, C & Pellegrini, G [Show all 283 contributors for this article] (2005). Beam tests of ATLAS SCT silicon strip detector modules. Nuclear Instruments and Methods in Physics Research Section A : Accelerators, Spectrometers, Detectors and Associated Equipment. ISSN 0168-9002. 538(1-3), p. 384–407. doi: 10.1016/j.nima.2004.08.133. Full text in Research Archive
• Campabadal, F.; Danielsen, Kjell Martin; Huse, Torkjell; Sandaker, Heidi & Stapnes, Steinar (2005). Design and performance of the ABCD3TA ASIC for readout of silicon strip detectors in the ATLAS semiconductor tracker. Nuclear Instruments and Methods in Physics Research Section A : Accelerators, Spectrometers, Detectors and Associated Equipment. ISSN 0168-9002. 552, p. 292–328. Full text in Research Archive

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• Huse, Torkjell (2004). Module assemly for SCT at UiO. Full text in Research Archive
• Huse, Torkjell (2003). Simulation of the ADD scenario. Full text in Research Archive
• Huse, Torkjell (2002). Module assembly for ATLAS at UiO. Full text in Research Archive
• Huse, Torkjell (2002). SCT activities in Oslo. Full text in Research Archive
• Huse, Torkjell (2002). New module assembly procedure in Oslo. Full text in Research Archive
• Aad, G.; Bugge, Lars; Buran, Torleiv; Cameron, David; Gjelsten, Børge Kile & Huse, Torkjell [Show all 17 contributors for this article] (2008). Expected Performance of the ATLAS Experiment - Detector, Trigger and Physics. CERN. Full text in Research Archive
• Abdesselam, A.; Danielsen, Kjell Martin; Dorholt, Ole; Huse, Torkjell; Sandaker, Heidi & Stapnes, Steinar (2006). ATLAS SCT End-Cap Module Production. ATL-INDET-PUB-2006-007. Full text in Research Archive

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