1,839 research outputs found
A low energy ion beamline for TwinEBIS
No full textA low energy beamline has been designed for the TwinEBIS setup. The beamline will be used to transport ions extracted from the electron beam ion source into an accelerating radio frequency quadrupole or into secondary devices, like a time of flight-mass spectrometer, attached to the beamline via a fast three way
20° ion switchyard. Optional injection of ions from an external source into the electron beam ion source is foreseen. In this article the general layout of the
beamline is presented and supported with simulations of the ion-optical matching. Furthermore, the switchyard and gridded electrostatic lenses, chosen as the main focusing elements, have been
simulated to assess their impact on the beam quality and the dynamics of secondary electrons emitted by the gridded lenses. In addition, the beamline includes general diagnostic devices, including a
bidirectional pepperpot beam profiler. An overview of the diagnostic elements is given
Charge breeding of CO beams at REX-ISOLDE
No full textThe β+ emitter 11C is a possible treatment ion for hadron therapy owing to its excellent properties in PET imaging, which could be used for range verification during the treatment. A charge breeder is required to transform the molecular CO+ beam, coming from an ISOL-production stage (Isotope Separation OnLine), to Cn+ and to match it with the acceptance of the medical accelerator. At REX-ISOLDE we have tested charge breeding of stable, molecular 13CO+ beams. Efficiencies for the normal REX operation scheme including a Penning trap and an Electron Beam Ion Source (EBIS) as well as for continuous injection into the EBIS without prior cooling and bunching in the trap are presented. We have in more detail explored molecular break-up in the buffer gas of the Penning trap and loss-mechanisms in the EBIS. Several 107 C6+ ions per pulse could be extracted, however, based on the present measurements, we also discuss possibilities for the future to increase the output and efficiency of the charge breeder
Author Correction: A portrait of the Higgs boson by the CMS experiment ten years after the discovery
No full textIn the version of this article initially published, CMS Collaboration author names, affiliations and acknowledgements were omitted and have now been included in the HTML and PDF versions of the articl
The TwinEBIS setup: Machine description
No full textInternational audienceTwinEBIS is an Electron Beam Ion Source (EBIS) recently made operational at CERN. The device is similar in construction to the REXEBIS charge breeder operating at the ISOLDE facility. After relocation of the solenoid from the Manne Siegbahn Laboratory (MSL) Stockholm, TwinEBIS was commissioned at CERN and serves as a test bench dedicated to manipulation of low-energy highly charged ions. In this paper we give an overview of the setup and present advanced numerical simulations of the electron optics. In addition, the alignment procedure of the solenoid magnetic field is described and measurement results are presented. Results from cathode investigations, electron beam tests and ion extraction modulation are presented in a follow-up paper
Challenges in C charge breeding
No full textIn this paper we discuss the possibilities of using a charge breeding scheme based on an Electron Beam Ion Source for beam preparation of a radioactive C beam for hadron therapy. Test measurements under extreme operating conditions were conducted at the REX-ISOLDE facility to explore the limitations of the charge breeder for high-intensity, low-repetition-rate, molecular CO beams. Based on our findings, we discuss different possible scenarios of coupling a charge breeder with either a medical synchrotron or linear accelerator. This paper is a highly condensed version of an exhaustive report on the topic [1], which we would like to refer to for further details
MEDeGUN commissioning results
No full textMEDeGUN [1] is an electron gun to be used in an Electron Beam Ion Source (EBIS) designed to serve as C6+ source for LINAC-based 2nd generation hadron therapy facilities [2]. The latter require short pulses of at least 1*108 particles at a repetition rate of 400 Hz, which exceeds the possibilities of currently used electron cyclotron resonance ion sources (ECRIS) and EBISes. The design of MEDeGUN is based on a combination of electrostatic and magnetic compression, which is commonly referred to as Brillouin gun. As previous devices have shown, it is difficult to achieve the design goals in this configuration due to the high sensitivity of the electron beam to any field imperfection. Therefore, the number of interfaces between the cathode, Wehnelt and anode electrodes have been reduced to only two in our design. In spring 2017, the MEDeGUN assembly was installed at the TwinEBIS test bench at CERN [3]. We have since then propagated an electron beam of more than 1 A at 10 keV electron energy through the 2T solenoid with losses of less than 1 mA. We will here present the commissioning results and discuss them with respect to the design goals
Search for CP violation in t t ¯ H and tH production in multilepton channels in proton-proton collisions at s = 13 TeV
No full textAbstract
The charge-parity (CP) structure of the Yukawa interaction between the Higgs (H) boson and the top quark is measured in a data sample enriched in the t
t
¯
H and tH associated production, using 138 fb−1 of data collected in proton-proton collisions at
s
= 13 TeV by the CMS experiment at the CERN LHC. The study targets events where the H boson decays via H → WW or H → ττ and the top quarks decay via t → Wb: the W bosons decay either leptonically or hadronically, and final states characterized by the presence of at least two leptons are studied. Machine learning techniques are applied to these final states to enhance the separation of CP -even from CP -odd scenarios. Two-dimensional confidence regions are set on κt and
κ
~
t, which are respectively defined as the CP -even and CP -odd top-Higgs Yukawa coupling modifiers. No significant fractional CP -odd contributions, parameterized by the quantity |
f
CP
Htt
| are observed; the parameter is determined to be |
f
CP
Htt
| = 0.59 with an interval of (0.24, 0.81) at 68% confidence level. The results are combined with previous results covering the H → ZZ and H → γγ decay modes, yielding two- and one-dimensional confidence regions on κt and
κ
~
t, while |
f
CP
Htt
| is determined to be |
f
CP
Htt
| = 0.28 with an interval of |
f
CP
Htt
| < 0.55 at 68% confidence level, in agreement with the standard model CP -even prediction of |
f
CP
Htt
| = 0
Time resolution studies of Timepix3 assemblies with thin silicon pixel sensors
No full textTimepix3 is a multi-purpose readout ASIC for hybrid pixel detectors. It can measure time and amplitude simultaneously by employing time-of-arrival (ToA) and time-over-threshold (ToT) techniques. Both methods are systematically affected by timewalk. In this paper, a method for pixel-by-pixel calibration of the time response is presented. Assemblies of Timepix3 ASICs bump-bonded to thin planar silicon pixel sensors with thicknesses of 50 μ m, 100 μ m and 150 μ m are calibrated and characterised in particle beams. For minimum ionising particles, time resolutions down to 0.72 ± 0.04 ns are achieved
Measurement of the dependence of the hadron production fraction ratios <i>f<sub>s</sub></i>/<i>f<sub>u</sub></i> and <i>f<sub>d</sub></i>/<i>f<sub>u</sub></i> on <i>B</i> meson kinematic variables in proton-proton collisions at 1a<i>s</i>=13 TeV
No full textAbstract: The dependence of the ratio between the B-s(0) and B+ hadron production fractions, f(s)/f(u), on the transverse momentum (p(T)) and rapidity of the B mesons is studied using the decay channels B-s(0) -> J/psi phi and B+ -> J/psi K+. The analysis uses a data sample of proton-proton collisions at a center-of-mass energy of 13 TeV, collected by the CMS experiment in 2018 and corresponding to an integrated luminosity of 61.6 fb(-1). The f(s)/f(u) ratio is observed to depend on the B p(T) and to be consistent with becoming asymptotically constant at large p(T). No rapidity dependence is observed. The ratio of the B-0 to B+ meson production fractions, f(d)/f(u), is also measured, for the first time in proton-proton collisions, using the B-0 -> J/psi K*(0) decay channel. The result is found to be within 1 standard deviation of unity and independent of p(T) and rapidity, as expected from isospin invariance
Search for new physics in events with two soft oppositely charged leptons and missing transverse momentum in proton–proton collisions at s=13TeV
No full textSEIDI, CPAN, PCTI and FEDER (Spain). Individuals have received support from the Marie-Curie programme and the European Research Council and Horizon 2020 Grant, contract No. 675440 (European Union); the Programa Severo Ochoa del Principado de Asturias (...)Sirunyan, A.M., Tumasyan, A., Adam, W., Ambrogi, F., Asilar, E., Bergauer, T., Brandstetter, J., Brondolin, E., Dragicevic, M., Erö, J., Escalante Del Valle, A., Flechl, M., Friedl, M., Frühwirth, R., Ghete, V.M., Grossmann, J., Hrubec, J., Jeitler, M., König, A., Krammer, N., Krätschmer, I., Liko, D., Madlener, T., Mikulec, I., Pree, E., Rad, N., Rohringer, H., Schieck, J., Schöfbeck, R., Spanring, M., Spitzbart, D., Taurok, A., Waltenberger, W., Wittmann, J., Wulz, C.-E., Zarucki, M., Chekhovsky, V., Mossolov, V., Suarez Gonzalez, J., De Wolf, E.A., Di Croce, D., Janssen, X., Lauwers, J., Van De Klundert, M., Van Haevermaet, H., Van Mechelen, P., Van Remortel, N., Abu Zeid, S., Blekman, F., D'Hondt, J., De Bruyn, I., De Clercq, J., Deroover, K., Flouris, G., Lontkovskyi, D., Lowette, S., Marchesini, I., Moortgat, S., Moreels, L., Python, Q., Skovpen, K., Tavernier, S., Van Doninck, W., Van Mulders, P., Van Parijs, I., Beghin, D., Bilin, B., Brun, H., Clerbaux, B., De Lentdecker, G., Delannoy, H., Dorney, B., Fasanella, G., Favart, L., Goldouzian, R., Grebenyuk, A., Kalsi, A.K., Lenzi, T., Luetic, J., Maerschalk, T., Seva, T., Starling, E., Vander Velde, C., Vanlaer, P., Vannerom, D., Yonamine, R., Zenoni, F., Cornelis, T., Dobur, D., Fagot, A., Gul, M., Khvastunov, I., Poyraz, D., Roskas, C., Salva, S., Trocino, D., Tytgat, M., Verbeke, W., Vit, M., Zaganidis, N., Bakhshiansohi, H., Bondu, O., Brochet, S., Bruno, G., Caputo, C., Caudron, A., David, P., De Visscher, S., Delaere, C., Delcourt, M., Francois, B., Giammanco, A., Krintiras, G., Lemaitre, V., Magitteri, A., Mertens, A., Musich, M., Piotrzkowski, K., Quertenmont, L., Saggio, A., Vidal Marono, M., Wertz, S., Zobec, J., Aldá Júnior, W.L., Alves, F.L., Alves, G.A., Brito, L., Correia Silva, G., Hensel, C., Moraes, A., Pol, M.E., Rebello Teles, P., Belchior Batista Das Chagas, E., Carvalho, W., Chinellato, J., Coelho, E., Da Costa, E.M., Da Silveira, G.G., De Jesus Damiao, D., Fonseca De Souza, S., Huertas Guativa, L.M., Malbouisson, H., Melo De Almeida, M., Mora Herrera, C., Mundim, L., Nogima, H., Sanchez Rosas, L.J., Santoro, A., Sznajder, A., Thiel, M., Tonelli Manganote, E.J., Torres Da Silva De Araujo, F., Vilela Pereira, A., Ahuja, S., Bernardes, C.A., Fernandez Perez Tomei, T.R., Gregores, E.M., Mercadante, P.G., Novaes, S.F., Padula, S.S., Romero Abad, D., Ruiz Vargas, J.C., Aleksandrov, A., Hadjiiska, R., Iaydjiev, P., Marinov, A., Misheva, M., Rodozov, M., Shopova, M., Sultanov, G., Dimitrov, A., Litov, L., Pavlov, B., Petkov, P., Fang, W., Gao, X., Yuan, L., Ahmad, M., Bian, J.G., Chen, G.M., Chen, H.S., Chen, M., Chen, Y., Jiang, C.H., Leggat, D., Liao, H., Liu, Z., Romeo, F., Shaheen, S.M., Spiezia, A., Tao, J., Wang, C., Wang, Z., Yazgan, E., Zhang, H., Zhao, J., Ban, Y., Chen, G., Li, J., Li, Q., Liu, S., Mao, Y., Qian, S.J., Wang, D., Xu, Z., Zhang, F., Wang, Y., Avila, C., Cabrera, A., Carrillo Montoya, C.A., Chaparro Sierra, L.F., Florez, C., González Hernández, C.F., Ruiz Alvarez, J.D., Segura Delgado, M.A., Courbon, B., Godinovic, N., Lelas, D., Puljak, I., Ribeiro Cipriano, P.M., Sculac, T., Antunovic, Z., Kovac, M., Brigljevic, V., Ferencek, D., Kadija, K., Mesic, B., Starodumov, A., Susa, T., Ather, M.W., Attikis, A., Mavromanolakis, G., Mousa, J., Nicolaou, C., Ptochos, F., Razis, P.A., Rykaczewski, H., Finger, M., Finger, M., Jr., Carrera Jarrin, E., Abdelalim, A.A., Khalil, S., Mohamed, A., Bhowmik, S., Dewanjee, R.K., Kadastik, M., Perrini, L., Raidal, M., Veelken, C., Eerola, P., Kirschenmann, H., Pekkanen, J., Voutilainen, M., Havukainen, J., Heikkilä, J.K., Järvinen, T., Karimäki, V., Kinnunen, R., Lampén, T., Lassila-Perini, K., Laurila, S., Lehti, S., Lindén, T., Luukka, P., Mäenpää, T., Siikonen, H., Tuominen, E., Tuominiemi, J., Tuuva, T., Besancon, M., Couderc, F., Dejardin, M., Denegri, D., Faure, J.L., Ferri, F., Ganjour, S., Ghosh, S., Givernaud, A., Gras, P., Hamel de Monchenault, G., Jarry, P., Leloup, C., Locci, E., Machet, M., Malcles, J., Negro, G., Rander, J., Rosowsky, A., Sahin, M.Ö., Titov, M., Abdulsalam, A., Amendola, C., Antropov, I., Baffioni, S., Beaudette, F., Busson, P., Cadamuro, L., Charlot, C., Granier de Cassagnac, R., Jo, M., Kucher, I., Lisniak, S., Lobanov, A., Martin Blanco, J., Nguyen, M., Ochando, C., Ortona, G., Paganini, P., Pigard, P., Salerno, R., Sauvan, J.B., Sirois, Y., Stahl Leiton, A.G., Strebler, T., Yilmaz, Y., Zabi, A., Zghiche, A., Agram, J.-L., Andrea, J., Bloch, D., Brom, J.-M., Buttignol, M., Chabert, E.C., Collard, C., Conte, E., Coubez, X., Drouhin, F., Fontaine, J.-C., Fuks, B., Gelé, D., Goerlach, U., Jansová, M., Juillot, P., Le Bihan, A.-C., Tonon, N., Van Hove, P., Gadrat, S., Beauceron, S., Bernet, C., Boudoul, G., Chanon, N., Chierici, R., Contardo, D., Depasse, P., El Mamouni, H., Fay, J., Finco, L., Gascon, S., Gouzevitch, M., Grenier, G., Ille, B., Lagarde, F., Laktineh, I.B., Lethuillier, M., Mirabito, L., Pequegnot, A.L., Perries, S., Popov, A., Sordini, V., Vander Donckt, M., Viret, S., Zhang, S., Khvedelidze, A., Tsamalaidze, Z., Autermann, C., Feld, L., Kiesel, M.K., Klein, K., Lipinski, M., Preuten, M., Schomakers, C., Schulz, J., Teroerde, M., Wittmer, B., Zhukov, V., Albert, A., Duchardt, D., Endres, M., Erdmann, M., Erdweg, S., Esch, T., Fischer, R., Güth, A., Hebbeker, T., Heidemann, C., Hoepfner, K., Knutzen, S., Merschmeyer, M., Meyer, A., Millet, P., Mukherjee, S., Pook, T., Radziej, M., Reithler, H., Rieger, M., Scheuch, F., Teyssier, D., Thüer, S., Flügge, G., Kargoll, B., Kress, T., Künsken, A., Müller, T., Nehrkorn, A., Nowack, A., Pistone, C., Pooth, O., Stahl, A., Aldaya Martin, M., Arndt, T., Asawatangtrakuldee, C., Beernaert, K., Behnke, O., Behrens, U., Bermúdez Martínez, A., Bin Anuar, A.A., Borras, K., Botta, V., Campbell, A., Connor, P., Contreras-Campana, C., Costanza, F., Diez Pardos, C., Eckerlin, G., Eckstein, D., Eichhorn, T., Eren, E., Gallo, E., Garay Garcia, J., Geiser, A., Grados Luyando, J.M., Grohsjean, A., Gunnellini, P., Guthoff, M., Harb, A., Hauk, J., Hempel, M., Jung, H., Kasemann, M., Keaveney, J., Kleinwort, C., Korol, I., Krücker, D., Lange, W., Lelek, A., Lenz, T., Lipka, K., Lohmann, W., Mankel, R., Melzer-Pellmann, I.-A., Meyer, A.B., Missiroli, M., Mittag, G., Mnich, J., Mussgiller, A., Pitzl, D., Raspereza, A., Savitskyi, M., Saxena, P., Shevchenko, R., Stefaniuk, N., Van Onsem, G.P., Walsh, R., Wen, Y., Wichmann, K., Wissing, C., Zenaiev, O., Aggleton, R., Bein, S., Blobel, V., Centis Vignali, M., Dreyer, T., Garutti, E., Gonzalez, D., Haller, J., Hinzmann, A., Hoffmann, M., Karavdina, A., Kasieczka, G., Klanner, R., Kogler, R., Kovalchuk, N., Kurz, S., Marconi, D., Meyer, M., Niedziela, M., Nowatschin, D., Pantaleo, F., Peiffer, T., Perieanu, A., Scharf, C., Schleper, P., Schmidt, A., Schumann, S., Schwandt, J., Sonneveld, J., Stadie, H., Steinbrück, G., Stober, F.M., Stöver, M., Tholen, H., Troendle, D., Usai, E., Vanhoefer, A., Vormwald, B., Akbiyik, M., Barth, C., Baselga, M., Baur, S., Butz, E., Caspart, R., Chwalek, T., Colombo, F., De Boer, W., Dierlamm, A., Faltermann, N., Freund, B., Friese, R., Giffels, M., Harrendorf, M.A., Hartmann, F., Heindl, S.M., Husemann, U., Kassel, F., Kudella, S., Mildner, H., Mozer, M.U., Müller, T., Plagge, M., Quast, G., Rabbertz, K., Schröder, M., Shvetsov, I., Sieber, G., Simonis, H.J., Ulrich, R., Wayand, S., Weber, M., Weiler, T., Williamson, S., Wöhrmann, C., Wolf, R., Klasen, M., Sunder, M., Anagnostou, G., Daskalakis, G., Geralis, T., Kyriakis, A., Loukas, D., Topsis-Giotis, I., Karathanasis, G., Kesisoglou, S., Panagiotou, A., Saoulidou, N., Tziaferi, E., Kousouris, K., Evangelou, I., Foudas, C., Gianneios, P., Katsoulis, P., Kokkas, P., Mallios, S., Manthos, N., Papadopoulos, I., Paradas, E., Strologas, J., Triantis, F.A., Tsitsonis, D., Csanad, M., Filipovic, N., Pasztor, G., Surányi, O., Veres, G.I., Bencze, G., Hajdu, C., Horvath, D., Hunyadi, Á., Sikler, F., Veszpremi, V., Vesztergombi, G., Beni, N., Czellar, S., Karancsi, J., Makovec, A., Molnar, J., Szillasi, Z., Bartók, M., Raics, P., Trocsanyi, Z.L., Ujvari, B., Choudhury, S., Komaragiri, J.R., Bahinipati, S., Mal, P., Mandal, K., Nayak, A., Sahoo, D.K., Sahoo, N., Swain, S.K., Bansal, S., Beri, S.B., Bhatnagar, V., Chawla, R., Dhingra, N., Kaur, A., Kaur, M., Kaur, S., Kumar, R., Kumari, P., Mehta, A., Singh, J.B., Walia, G., Kumar, A., Shah, A., Bhardwaj, A., Chauhan, S., Choudhary, B.C., Garg, R.B., Keshri, S., Kumar, A., Malhotra, S., Naimuddin, M., Ranjan, K., Sharma, R., Bhardwaj, R., Bhattacharya, R., Bhattacharya, S., Bhawandeep, U., Bhowmik, D., Dey, S., Dutt, S., Dutta, S., Ghosh, S., Majumdar, N., Modak, A., Mondal, K., Mukhopadhyay, S., Nandan, S., Purohit, A., Rout, P.K., Roy, A., Roy Chowdhury, S., Sarkar, S., Sharan, M., Singh, B., Thakur, S., Behera, P.K., Chudasama, R., Dutta, D., Jha, V., Kumar, V., Mohanty, A.K., Netrakanti, P.K., Pant, L.M., Shukla, P., Topkar, A., Aziz, T., Dugad, S., Mahakud, B., Mitra, S., Mohanty, G.B., Sur, N., Sutar, B., Banerjee, S., Bhattacharya, S., Chatterjee, S., Das, P., Guchait, M., Jain, S., Kumar, S., Maity, M., Majumder, G., Mazumdar, K., Sarkar, T., Wickramage, N., Chauhan, S., Dube, S., Hegde, V., Kapoor, A., Kothekar, K., Pandey, S., Rane, A., Sharma, S., Chenarani, S., Eskandari Tadavani, E., Etesami, S.M., Khakzad, M., Mohammadi Najafabadi, M., Naseri, M., Paktinat Mehdiabadi, S., Rezaei Hosseinabadi, F., Safarzadeh, B., Zeinali, M., Felcini, M., Grunewald, M., Abbrescia, M., Calabria, C., Colaleo, A., Creanza, D., Cristella, L., De Filippis, N., De Palma, M., Errico, F., Fiore, L., Iaselli, G., Lezki, S., Maggi, G., Maggi, M., Marangelli, B., Miniello, G., My, S., Nuzzo, S., Pompili, A., Pugliese, G., Radogna, R., Ranieri, A., Selvaggi, G., Sharma, A., Silvestris, L., Venditti, R., Verwilligen, P., Zito, G., Abbiendi, G., Battilana, C., Bonacorsi, D., Borgonovi, L., Braibant-Giacomelli, S., Campanini, R., Capiluppi, P., Castro, A., Cavallo, F.R., Chhibra, S.S., Codispoti, G., Cuffiani, M., Dallavalle, G.M., Fabbri, F., Fanfani, A., Fasanella, D., Giacomelli, P., Grandi, C., Guiducci, L., Iemmi, F., Marcellini, S., Masetti, G., Montanari, A., Navarria, F.L., Perrotta, A., Rossi, A.M., Rovelli, T., Siroli, G.P., Tosi, N., Albergo, S., Costa, S., Di Mattia, A., Giordano, F., Potenza, R., Tricomi, A., Tuve, C., Barbagli, G., Chatterjee, K., Ciulli, V., Civinini, C., D'Alessandro, R., Focardi, E., Latino, G., Lenzi, P., Meschini, M., Paoletti, S., Russo, L., Sguazzoni, G., Strom, D., Viliani, L., Benussi, L., Bianco, S., Fabbri, F., Piccolo, D., Primavera, F., Calvelli, V., Ferro, F., Ravera, F., Robutti, E., Tosi, S., Benaglia, A., Beschi, A., Brianza, L., Brivio, F., Ciriolo, V., Dinardo, M.E., 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