Charge collection study with the ATLAS ITk prototype silicon strip sensors ATLAS17LS

0535545 - FZÚ 2021 RIV NL eng J - Journal Article
Hara, K. - Abidi, S. H. - Affolder, A. A. - Allport, P. - Basso, M. J. - Casha, A. - Cindro, V. - Ciungu, B. M. - Dette, K. - Escobar, C. - Fadeyev, V. - Freeman, P. - Garcia, C. - Gonella, L. - Gunnell, J. - Harada, D. - Helling, C. - Hunter, A. - Kisliuk, D. - Kopsalis, I. - Kroll, Jiří - Lacasta, C. - Latoňová, Věra - Mandic, I. - Martinez-Mckinney, F. - Mikeštíková, Marcela - Minano, M. - Nakamura, K. - Nicolini, J. - Onaru, K. - Orr, R. S. - Pyatt, S. - Saito, K. - Sato, K. - Simpson-Allsop, C. - Soldevila, U. - Teuscher, R. - Thomas, J. - Unno, Y. - Wada, S. - Worm, S. - Zatočilová, Iveta
Charge collection study with the ATLAS ITk prototype silicon strip sensors ATLAS17LS.
Nuclear Instruments & Methods in Physics Research Section A. Roč. 983, Dec (2020), s. 1-6, č. článku 164422. ISSN 0168-9002. E-ISSN 1872-9576
R&D Projects: GA MŠMT(CZ) LM2018104
Institutional support: RVO:68378271
Keywords : ATLAS ITk * microstrip sensor * charge collection * radiation damage
OECD category: Particles and field physics
Impact factor: 1.455, year: 2020
Method of publishing: Limited access
https://doi.org/10.1016/j.nima.2020.164422

The inner tracker of the ATLAS detector is scheduled to be replaced by a completely new silicon-based inner tracker (ITk) for the Phase-II of the CERN LHC (HL-LHC). The silicon strip detector covers the volume 40 < R < 100 cm in the radial and |z| < 300 cm in the longitudinal directions. The silicon sensors for the detector will be fabricated using the n+-on-p 6-inch wafer technology, for a total of 22,000 wafers. Intensive studies were carried out on the final prototype sensors ATLAS17LS fabricated by Hamamatsu Photonics (HPK). The charge collection properties were examined using penetrating 90Sr β-rays and the ALIBAVA fast readout system for the miniature sensors of 1 cm × 1 cm in area. The samples were irradiated by protons in the 27 MeV Birmingham Cyclotron, the 70 MeV CYRIC at Tohoku University, and the 24 GeV CERN-PS, and by neutrons at Ljubljana TRIGA reactor for fluence values up to 2×1015 neq/cm2. The change in the charge collection with fluence was found to be similar to the previous prototype ATLAS12, and acceptable for the ITk. Sensors with two active thicknesses, 300 μm (standard) and 240 μm (thin), were compared and the difference in the charge collection was observed to be small for bias voltages up to 500 V. Some samples were also irradiated with gamma radiation up to 2 MGy, and the full depletion voltage was found to decrease with the dose. This was caused by the Compton electrons due to the 60Co gamma radiation. To summarize, the design of the ATLAS17LS and technology for its fabrication have been verified for implementation in the ITk. We are in the stage of sensor pre-production with the first sensors already delivered in January of 2020.

Permanent Link: http://hdl.handle.net/11104/0313617