Erlangen 2026 – scientific programme
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T: Fachverband Teilchenphysik
T 52: Silicon Detectors V
T 52.4: Talk
Wednesday, March 18, 2026, 17:00–17:15, KH 01.012
A novel Low Gain Avalanche Diode design: MARTHA — •E. C. Wais1, A. Baehr2, J. Damore2, E. Garutti1, C. Koffmane2, J. Ninkovic2, E. Prinker2, R. H. Richter2, G. Schaller2, F. Schopper2, J. Schwandt1, and J. Tries2 — 1University of Hamburg — 2Semiconductor Laboratory of the MPG
To cope with the high interaction rates of new colliders, detectors with time resolution in the range of 10 ps are required to disentangle pileups. LGADs are a promising candidate for this task. LGADs feature a low amplification gain, which enables good timing resolution in thin sensors. However, due to the strong electrical field in the gain region, LGADs tend to break down at the pixel edges. In order to overcome this, the sensors have to be equipped with complex separation structures, which usually result in dead areas without gain between pixels. The Monolithic Array of Reach THrough Avalanche diodes design aims to tackle this problem, by combining a deeply implanted gain layer followed by an additional n-doped Field Drop Layer. This reduces the electric field at the n+-edges, thereby preventing them from breaking down. Since the gain region is not segmented, there are no dead spaces in the inter-pixel regions. A first prototype batch with test structures is being investigated. The sensors are optimized for photon detection without any specific timing requirements and are expected to have a fill factor of 100%. Future R&D aims to optimize this design for fast timing applications. In this talk, the MARTHA concept, characterization measurements and first test beam data from the DESY 2 test beam facility, are presented.
Keywords: LGAD