Kai Lukas Unger, M. Sc.

  • Engesserstr. 5

    76131 Karlsruhe

Research interests

Low Latency Trigger

Modern particle accelerator experiments nowadays produce immense amounts of data that cannot be stored. Therefore, the data is analyzed by trigger systems in real-time and only the really relevant data is stored. This analysis is performed by multi-stage triggers. At ITIV, in close collaboration with experimental physicists, new hardware architectures based on FPGA are developed for the level 1 trigger stage. For this purpose, classical algorithms, as well as machine learning based systems, are implemented and analyzed.

High throughput Data Acquisition

In large-scale physics experiments, immense amounts of data have to be transferred. Therefore, a powerful DAQ system is extremely important for a successful experiment. ITIV is developing such systems together with Campus North. We are investigating future FPGA and ASIC architectures for efficient processing and forwarding of experiment data.

Fast AI in High Energy Physics

Artificial intelligence is becoming increasingly important in high-energy physics. Machine learning algorithms are currently mostly used in physics data centers. GPU or TPU based servers are mainly used for this purpose. We are trying to implement these algorithms in FPGA hardware to run them faster.

Supervised student works (selection)

  • SA:“ Vergleich der Implementierungen des Track-Findings in den L1-Trigger-Systemen des ATLAS- und des CMS-Projekts“
  • BA: “Hardware/Software Co-Simulation of the Track Segment Finder for the Belle II Experiment “
  • BA: “Slow Control Monitoring for the Neural Network Trigger in the Belle II Experiment “

Publications


2021
Journal Articles
Feasibility studies of conserved charge fluctuations in Au-Au collisions with CBM.
CBM Collaboration; Samanta, S.; Bähr, S.; Balzer, M.; Becker, J.; Blank, T.; Caselle, M.; Sidorenko, V.; Trifonova, E.; Unger, K. L.; Weber, M.
2021. Nuclear physics <Amsterdam> / A, 1005, Art.-Nr.: 121896. doi:10.1016/j.nuclphysa.2020.121896
CBM Collaboration.
CBM Collaboration; Ablyazimov, T.; Adak, R. P.; Adler, A.; Agarwal, A.; Agarwal, K.; Ahammed, Z.; Ahmad, A.; Ahmad, F.; Ahmad, N.; Akindinov, A.; Akishin, P.; Akishina, V.; Al-Turany, M.; Alekseev, I.; Alexandrov, E.; Alexandrov, I.; Andronic, A.; Appelshäuser, H.; Unger, K. L.; et al.
2021. Nuclear physics <Amsterdam> / A, 1005, Article no: 122089. doi:10.1016/S0375-9474(20)30414-0
2020
Journal Articles
Transverse and longitudinal segmented forward hadron calorimeters with SiPMs light readout for future fixed target heavy ion experiments.
BM@N Collaboration; CBM Collaboration; NA61/SHINE Collaboration; Guber, F.; Finogeev, D.; Golubeva, M.; Ivashkin, A.; Izvestnyy, A.; Karpushkin, N.; Morozov, S.; Kugler, A.; Mikhaylov, V.; Senger, A.; Bähr, S.; Balzer, M.; Becker, J.; Blank, T.; Caselle, M.; Sidorenko, V.; Unger, K. L.; et al.
2020. Nuclear instruments & methods in physics research / A, 958, Art.-Nr. 162728. doi:10.1016/j.nima.2019.162728
Status of the Compressed Baryonic Matter experiment at FAIR.
CBM Collaboration; Senger, P.; Bähr, S.; Balzer, M.; Becker, J.; Blank, T.; Caselle, M.; Sidorenko, V.; Trifonova, E.; Unger, K. L.; Weber, M.
2020. International journal of modern physics / E, 29 (02), 2030001–1. doi:10.1142/S0218301320300015
Probing dense QCD matter in the laboratory—The CBM experiment at FAIR.
CBM Collaboration; Senger, P.; Bähr, S.; Balzer, M.; Becker, J.; Blank, T.; Caselle, M.; Sidorenko, V.; Trifonova, E.; Unger, K. L.; Weber, M.
2020. Physica scripta, 95 (7), Art.-Nr.: 074003. doi:10.1088/1402-4896/ab8c14
Physics Performance Studies for Anisotropic Flow Measurements with the CBM Experiment at FAIR.
CBM Collaboration; Golosov, O.; Klochkov, V.; Kashirin, E.; Selyuzhenkov, I.; Bähr, S.; Balzer, M.; Becker, J.; Blank, T.; Caselle, M.; Sidorenko, V.; Trifonova, E.; Unger, K. L.; Weber, M.
2020. Physics of particles and nuclei, 51 (3), 297–300. doi:10.1134/S1063779620030119
Using multiplicity of produced particles for centrality determination in heavy-ion collisions with the CBM experiment.
CBM Collaboration; Segal, I.; Lubynets, O.; Selyuzhenkov, I.; Klochkov, V.; Bähr, S.; Balzer, M.; Becker, J.; Blank, T.; Caselle, M.; Sidorenko, V.; Trifonova, E.; Unger, K. L.; Weber, M.
2020. Journal of Physics: Conference Series, 1690, Art.-Nr.: 012107. doi:10.1088/1742-6596/1690/1/012107
Performance for proton anisotropic flow measurement of the CBM experiment at FAIR.
CBM Collaboration; Golosov, O.; Klochkov, V.; Kashirin, E.; Selyuzhenkov, I.; Bähr, S.; Balzer, M.; Becker, J.; Blank, T.; Caselle, M.; Sidorenko, V.; Trifonova, E.; Unger, K. L.; Weber, M.
2020. Journal of Physics: Conference Series, 1690, Art.-Nr. 012104. doi:10.1088/1742-6596/1690/1/012104
Search for Axionlike Particles Produced in e⁺ e⁻ Collisions at Belle II.
Belle 2 Collaboration; Abudinén, F.; Adachi, I.; Aihara, H.; Akopov, N.; Aloisio, A.; Ameli, F.; Anh Ky, N.; Asner, D. M.; Aushev, T.; Aushev, V.; Babu, V.; Baehr, S.; Bahinipati, S.; Bambade, P.; Banerjee, S.; Bansal, S.; Baudot, J.; Becker, J.; Unger, K.; et al.
2020. Physical review letters, 125 (16), Article: 161806. doi:10.1103/PhysRevLett.125.161806
Development of the Level-1 track trigger with Central Drift Chamber detector in Belle II experiment and its performance in SuperKEKB 2019 Phase 3 operation.
Belle 2 Collaboration; Lai, Y.-T.; Aoyama, M.; Bae, H.; Bähr, S.; Chang, M.-C.; Hayashii, H.; Iwasaki, Y.; Kim, J.-B.; Kim, K.-T.; Kiesling, C.; Koga, T.; Lu, P.-C.; Liu, S.-M.; Meggendorfer, F.; Moon, H.-K.; Moon, T.-J.; Nakazawa, H.; Rados, P.; Unger, K.; et al.
2020. Journal of Instrumentation, 15 (6), Art. Nr.: C06063. doi:10.1088/1748-0221/15/06/C06063
Search for an Invisibly Decaying Z’ Boson at Belle II in e⁺e⁻ → μ⁺μ⁻(eμ) Plus Missing Energy Final States.
Belle 2 Collaboration; Adachi, I.; Ahlburg, P.; Aihara, H.; Akopov, N.; Aloisio, A.; Anh Ky, N.; Asner, D. M.; Atmacan, H.; Aushev, T.; Aushev, V.; Aziz, T.; Babu, V.; Baehr, S.; Bambade, P.; Banerjee, S.; Bansal, V.; Barrett, M.; Baudot, J.; Unger, K.; et al.
2020. Physical review letters, 124 (14), Article: 141801. doi:10.1103/PhysRevLett.124.141801
Measurement of the integrated luminosity of the Phase 2 data of the Belle II experiment.
Belle 2 Collaboration; Abudinén, F.; Adachi, I.; Ahlburg, P.; Aihara, H.; Akopov, N.; Aloisio, A.; Ameli, F.; Andricek, L.; Anh Ky, N.; Asner, D. M.; Atmacan, H.; Aushev, T.; Aushev, V.; Aziz, T.; Azmi, K.; Babu, V.; Baehr, S.; Bahinipati, S.; Unger, K.; et al.
2020. Chinese physics / C, 44 (2), Article: 021001. doi:10.1088/1674-1137/44/2/021001
Conference Papers
Online Estimation of Particle Track Parameters based on Neural Networks for the Belle II Trigger System.
Baehr, S.; Unger, K. L.; Becker, J.; Meggendorfer, F.; Skambraks, S.; Kiesling, C.
2020. Proceedings of Artificial Intelligence for Science, Industry and Society — PoS(AISIS2019), 010, Scuola Internazionale Superiore di Studi Avanzati (SISSA). doi:10.22323/1.372.0010
Realization of a state machine based detection for Track Segments in the Trigger System of the Belle II Experiment.
Unger, K. L.; Bähr, S.; Becker, J.; Iwasaki, Y.; Kim, K.; Lai, Y.-T.
2020. Proceedings of Topical Workshop on Electronics for Particle Physics, TWEPP 2019, Santiago de Compostela, Spain, 2 - 6 September 2019, Code 160323. doi:10.22323/1.370.0145
2019
Journal Articles
The very forward hadron calorimeter PSD for the future CBM@FAIR experiment.
CBM Collaboration; Mikhaylov, V.; Kugler, A.; Kushpil, V.; Svoboda, O.; Tlustý, P.; Golubeva, M.; Guber, F.; Ivashkin, A.; Morozov, S.; Klochkov, V.; Selyuzhenkov, I.; Senger, A.; Bondarenko, S.; Burov, V.; Malakhov, A.; Bähr, S.; Balzer, M.; Becker, J.; Unger, K. L.; et al.
2019. The European physical journal / Web of Conferences, 204, Art.-Nr.: 11004. doi:10.1051/epjconf/201920411004
The Projectile Spectator Detector for measuring the geometry of heavy ion collisions at the CBM experiment on FAIR.
CBM Collaboration; Karpushkin, N.; Finogeev, D.; Golubeva, M.; Guber, F.; Ivashkin, A.; Izvestnyy, A.; Ladygin, V.; Morozov, S.; Kugler, A.; Mikhaylov, V.; Senger, A.; Bähr, S.; Balzer, M.; Becker, J.; Blank, T.; Caselle, M.; Sidorenko, V.; Trifonova, E.; Unger, K. L.; et al.
2019. Nuclear instruments & methods in physics research / A, 936, 156–157. doi:10.1016/j.nima.2018.10.054
Exploring Cosmic Matter in the Laboratory—The Compressed Baryonic Matter Experiment at FAIR.
CBM Collaboration; Senger, P.; Bähr, S.; Balzer, M.; Becker, J.; Blank, T.; Caselle, M.; Sidorenko, V.; Trifonova, E.; Unger, K. L.; Weber, M.
2019. Particles, 2 (4), 499–510. doi:10.3390/particles2040031
Conference Papers
Low Latency Neural Networks using Heterogenous Resources on FPGA for the Belle II Trigger.
Baehr, S.; Poehler, J.; Unger, K.; Hochstuhl, A.; Becker, J.; Skambraks, S.; McCarney, S.; Meggendorfer, F.; Kiesling, C.
2019. Connecting the Dots and Workshop on Intelligent Trackers (CTD/WIT 2019), València, E, April 2-5, 2019
Reports/Preprints
Measurement of the integrated luminosity of the Phase 2 data of the Belle II experiment.
Belle 2 Collaboration; Bähr, S.; Becker, J.; Unger, K.
2019
2018
Journal Articles
Event Topology Reconstruction in the CBM Experiment.
CBM Collaboration; Kisel, I.; Bähr, S.; Balzer, M.; Becker, J.; Blank, T.; Caselle, M.; Sidorenko, V.; Trifonova, E.; Unger, K. L.; Weber, M.
2018. Journal of Physics: Conference Series, 1070, 012015. doi:10.1088/1742-6596/1070/1/012015
Conference Papers
Level-1 track trigger with Central Drift Chamber detector in Belle II experiment.
Lai, Y.-T.; Baehr, S.; Chang, M. C.; Iwasaki, Y.; Kim, J. B.; Kim, K. T.; Kiesling, C.; Koga, T.; Lu, P. C.; Liu, S. M.; Meggendorfer, F.; Moon, H. K.; Moon, T. J.; Nakazawa, H.; Shiu, J. G.; Skambraks, S.; Sheng, T. Z.; Unger, K.; Wang, C. H.; Won, E.
2018. 2018 IEEE Nuclear Science Symposium and Medical Imaging Conference / 25th International Symposium on Room-Temperature Semiconductor X-Ray and Gamma-Ray Detectors (IEEE NSS/MIC 2018), Sydney, AUS, November 10-17, 2018, Institute of Electrical and Electronics Engineers (IEEE). doi:10.1109/NSSMIC.2018.8824506
2017
Journal Articles
A precision device needs precise simulation: Software description of the CBM Silicon Tracking System.
CBM Collaboration; Malygina, H.; Friese, V.; Bähr, S.; Balzer, M.; Becker, J.; Blank, T.; Caselle, M.; Sidorenko, V.; Trifonova, E.; Unger, K. L.; Weber, M.
2017. Journal of Physics: Conference Series, 898, Art.-Nr.: 042022. doi:10.1088/1742-6596/898/4/042022
The high-rate data challenge: computing for the CBM experiment.
CBM Collaboration; Friese, V.; Bähr, S.; Balzer, M.; Becker, J.; Blank, T.; Caselle, M.; Sidorenko, V.; Trifonova, E.; Unger, K. L.; Weber, M.
2017. Journal of Physics: Conference Series, 898, Art.-Nr. 112003. doi:10.1088/1742-6596/898/11/112003