The ATLAS Fast TracKer system
Journal of Instrumentation IOP Publishing 16:7 (2021) P07006
Authors:
G Aad, B Abbott, Dc Abbott, L Ambroz, G Artoni, WK Balunas, Aj Barr, L Beresford, D Bortoletto, F Celli, AM Cooper-Sarkar, MG Foti, JA Frost, GE Gallardo, EJ Gallas, JC Grundy, C Gwenlan, CP Hays, TB Huffman, K Karava, Z Li, L Marchese, C Merlassino, M Mironova, K Nagai, RB Nickerson, AP O'neill, SR Paredes Saenz, K Potamianos, E Schopf, IPJ Shipsey, HA Smith, B Stanislaus, M Stankaityte, C Tosciri, GHA Viehhauser, Y Wei, AR Weidberg, PJ Windischhofer, R Wölker, J Wuerzinger, G Zemaityte, M ZgubičAbstract:
The ATLAS Fast TracKer (FTK) was designed to provide full tracking for the ATLAS high-level trigger by using pattern recognition based on Associative Memory (AM) chips and fitting in high-speed field programmable gate arrays. The tracks found by the FTK are based on inputs from all modules of the pixel and silicon microstrip trackers. The as-built FTK system and components are described, as is the online software used to control them while running in the ATLAS data acquisition system. Also described is the simulation of the FTK hardware and the optimization of the AM pattern banks. An optimization for long-lived particles with large impact parameter values is included. A test of the FTK system with the data playback facility that allowed the FTK to be commissioned during the shutdown between Run 2 and Run 3 of the LHC is reported. The resulting tracks from part of the FTK system covering a limited η-ϕ region of the detector are compared with the output from the FTK simulation. It is shown that FTK performance is in good agreement with the simulation.Search for new phenomena in three- or four-lepton events in $pp$ collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector
ArXiv 2107.00404 (2021)
Two-particle azimuthal correlations in photonuclear ultraperipheral Pb+Pb collisions at 5.02 TeV with ATLAS
Physical Review C American Physical Society (APS) 104:1 (2021) 014903
Authors:
G Aad, B Abbott, DC Abbott, A Abed Abud, K Abeling, DK Abhayasinghe, SH Abidi, OS AbouZeid, NL Abraham, H Abramowicz, H Abreu, Y Abulaiti, AC Abusleme Hoffman, BS Acharya, B Achkar, L Adam, C Adam Bourdarios, L Adamczyk, L Adamek, J Adelman, A Adiguzel, S Adorni, T Adye, AA Affolder, Y Afik, C Agapopoulou, MN Agaras, A Aggarwal, C Agheorghiesei, JA Aguilar-Saavedra, A Ahmad, F Ahmadov, WS Ahmed, X Ai, G Aielli, S Akatsuka, M Akbiyik, TPA Åkesson, E Akilli, AV Akimov, K Al Khoury, GL Alberghi, J Albert, MJ Alconada Verzini, S Alderweireldt, M Aleksa, IN Aleksandrov, C Alexa, T Alexopoulos, A Alfonsi, F Alfonsi, M Alhroob, B Ali, S Ali, M Aliev, G Alimonti, C Allaire, BMM Allbrooke, PP Allport, A Aloisio, F Alonso, C Alpigiani, E Alunno Camelia, M Alvarez Estevez, MG Alviggi, Y Amaral Coutinho, A Ambler, L Ambroz, C Amelung, D Amidei, SP Amor Dos Santos, S Amoroso, CS Amrouche, C Anastopoulos, N Andari, T Andeen, JK Anders, SY Andrean, A Andreazza, V Andrei, CR Anelli, S Angelidakis, A Angerami, AV Anisenkov, A Annovi, C Antel, MT Anthony, E Antipov, M Antonelli, DJA Antrim, F Anulli, M Aoki, JA Aparisi Pozo, MA Aparo, L Aperio Bella, N Aranzabal, V Araujo Ferraz, C Arcangeletti, ATH Arce, J-F Arguin, S Argyropoulos, J-H Arling, AJ Armbruster, A Armstrong, O Arnaez, H Arnold, ZP Arrubarrena Tame, G Artoni, H Asada, K Asai, S Asai, NA Asbah, EM Asimakopoulou, L Asquith, J Assahsah, K Assamagan, R Astalos, RJ Atkin, M Atkinson, NB Atlay, H Atmani, PA Atmasiddha, K Augsten, VA Austrup, G Avolio, MK Ayoub, G Azuelos, D Babal, H Bachacou, K Bachas, F Backman, P Bagnaia, H Bahrasemani, AJ Bailey, VR Bailey, JT Baines, C Bakalis, OK Baker, PJ Bakker, E Bakos, D Bakshi Gupta, S Balaji, R Balasubramanian, EM Baldin, P Balek, F Balli, WK Balunas, J Balz, E Banas, M Bandieramonte, A Bandyopadhyay, L Barak, WM Barbe, EL Barberio, D Barberis, M Barbero, G Barbour, KN Barends, T Barillari, M-S Barisits, J Barkeloo, T Barklow, BM Barnett, RM Barnett, Z Barnovska-Blenessy, A Baroncelli, G Barone, AJ Barr, L Barranco Navarro, F Barreiro, J Barreiro Guimarães da Costa, U Barron, S Barsov, F Bartels, R Bartoldus, G Bartolini, AE Barton, P Bartos, A Basalaev, A Basan, A Bassalat, MJ Basso, CR Basson, RL Bates, S Batlamous, JR Batley, B Batool, M Battaglia, M Bauce, F Bauer, P Bauer, HS Bawa, A Bayirli, JB Beacham, T Beau, PH Beauchemin, F Becherer, P Bechtle, HP Beck, K Becker, C Becot, AJ Beddall, VA Bednyakov, CP Bee, TA Beermann, M Begalli, M Begel, A Behera, JK Behr, JF Beirer, F Beisiegel, M Belfkir, G Bella, L Bellagamba, A Bellerive, P Bellos, K Beloborodov, K Belotskiy, NL Belyaev, D Benchekroun, N Benekos, Y Benhammou, DP Benjamin, M Benoit, JR Bensinger, S Bentvelsen, L Beresford, M Beretta, D Berge, E Bergeaas Kuutmann, N Berger, B Bergmann, LJ Bergsten, J Beringer, S Berlendis, G Bernardi, C Bernius, FU Bernlochner, T Berry, P Berta, A Berthold, IA Bertram, O Bessidskaia Bylund, S Bethke, A Betti, AJ Bevan, S Bhatta, DS Bhattacharya, P Bhattarai, VS Bhopatkar, R Bi, RM Bianchi, O Biebel, R Bielski, K Bierwagen, NV Biesuz, M Biglietti, TRV Billoud, M Bindi, A Bingul, C Bini, S Biondi, CJ Birch-sykes, M Birman, T Bisanz, JP Biswal, D Biswas, A Bitadze, C Bittrich, K Bjørke, T Blazek, I Bloch, C Blocker, A Blue, U Blumenschein, GJ Bobbink, VS Bobrovnikov, D Bogavac, AG Bogdanchikov, C Bohm, V Boisvert, P Bokan, T Bold, M Bomben, M Bona, JS Bonilla, M Boonekamp, CD Booth, AG Borbély, HM Borecka-Bielska, LS Borgna, G Borissov, D Bortoletto, D Boscherini, M Bosman, JD Bossio Sola, K Bouaouda, J Boudreau, EV Bouhova-Thacker, D Boumediene, R Bouquet, A Boveia, J Boyd, D Boye, IR Boyko, AJ Bozson, J Bracinik, N Brahimi, G Brandt, O Brandt, F Braren, B Brau, JE Brau, WD Breaden Madden, K Brendlinger, R Brener, L Brenner, R Brenner, S Bressler, B Brickwedde, DL Briglin, D Britton, D Britzger, I Brock, R Brock, G Brooijmans, WK Brooks, E Brost, PA Bruckman de Renstrom, B Brüers, D Bruncko, A Bruni, G Bruni, M Bruschi, N Bruscino, L 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Yan, HJ Yang, HT Yang, S Yang, T Yang, X Yang, X Yang, Y Yang, Z Yang, W-M Yao, YC Yap, H Ye, J Ye, S Ye, I Yeletskikh, MR Yexley, P Yin, K Yorita, K Yoshihara, CJS Young, C Young, R Yuan, X Yue, M Zaazoua, B Zabinski, G Zacharis, E Zaffaroni, J Zahreddine, AM Zaitsev, T Zakareishvili, N Zakharchuk, S Zambito, D Zanzi, SV Zeißner, C Zeitnitz, G Zemaityte, JC Zeng, O Zenin, T Ženiš, S Zenz, S Zerradi, D Zerwas, M Zgubič, B Zhang, DF Zhang, G Zhang, J Zhang, K Zhang, L Zhang, L Zhang, M Zhang, R Zhang, S Zhang, X Zhang, X Zhang, Z Zhang, P Zhao, Y Zhao, Z Zhao, A Zhemchugov, Z Zheng, D Zhong, B Zhou, C Zhou, H Zhou, M Zhou, N Zhou, Y Zhou, CG Zhu, C Zhu, HL Zhu, H Zhu, J Zhu, Y Zhu, X Zhuang, K Zhukov, V Zhulanov, D Zieminska, NI Zimine, S Zimmermann, Z Zinonos, M Ziolkowski, L Živković, A Zoccoli, K Zoch, TG Zorbas, R Zou, W Zou, L ZwalinskiHigh-flux, adjustable, compact cold-atom source.
Optics express 29:14 (2021) 21143-21159
Authors:
Sean Ravenhall, Benjamin Yuen, Chris FootAbstract:
Magneto-optical traps (MOTs) are widely used for laser cooling of atoms. We have developed a high-flux compact cold-atom source based on a pyramid MOT with a unique adjustable aperture that is highly suitable for portable quantum technology devices, including space-based experiments. The adjustability enabled an investigation into the previously unexplored impact of aperture size on the atomic flux, and optimisation of the aperture size allowed us to demonstrate a higher flux than any reported cold-atom sources that use a pyramid, LVIS, 3D-MOT or grating MOT. We achieved 2.1(1) × 1010 atoms/s of 87Rb with a mean velocity of 32(1) m/s, FWHM of 27.6(9) m/s and divergence of 59(4) mrad. Halving the total optical power to 195 mW caused only a 20% reduction of the flux, and a 30% decrease in mean velocity. Methods to further decrease the velocity as required have been identified. The low power consumption and small size make this design suitable for a wide range of cold-atom technologies.Performance of the ATLAS RPC detector and Level-1 muon barrel trigger at root s=13 TeV
JOURNAL OF INSTRUMENTATION 16:7 (2021) ARTN P07029