LGAD technology for HADES, accelerator and medical applications

Krüger, Wilfried; Bergauer, T.; Galatyuk, T.; Hirtl, A.; Kedych, V.; Kiš, M.; Linev, S.; Michel, J.; Pietraszko, J.; Pitters, F. M.; Rost, A.; Schmidt, C.; Svintozelskyi, Volodymyr; Träger, M.; Traxler, M.; Ulrich-Pur, Felix; Wendisch, C.

doi:10.1016/j.nima.2022.167046

Cited by 2 publications

(2 citation statements)

References 9 publications

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“…The TOF-iCT demonstrator utilizes an adapted version of the readout system for the LGAD-based HADES start-reaction time (T 0 ) detector developed at GSI (Krüger et al 2022). A brief description of all components of the TOF-iCT demonstrator, including the LGAD sensors, corresponding front-end electronics (FEE) and dataacquisition (DAQ) system, is given in the following.…”

Section: Tof-ict Demonstratormentioning

confidence: 99%

First experimental time-of-flight-based proton radiography using low gain avalanche diodes

Ulrich-Pur,

Bergauer,

Galatyuk

et al. 2024

Phys. Med. Biol.

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Objective: Ion computed tomography (iCT) is an imaging modality for the direct determination of the relative stopping power (RSP) distribution within a patient’s body. Usually, this is done by estimating the path and energy loss of ions traversing the scanned volume utilising a tracking system and a separate residual energy detector. This study, on the other hand, introduces the first experimental study of a novel iCT approach based on time-of-flight (TOF) measurements, the so-called Sandwich TOF-iCT concept, which in contrast to any other iCT systems, does not require a residual energy detector for the RSP determination.Approach: A small Sandwich TOF-iCT demonstrator was built based on low gain avalanche diodes (LGADs), which are 4D-tracking detectors that allow to simultaneously measure the particle position and time-of-arrival with a precision better than 100 μm and 100 ps, respectively. Using this demonstrator, the material and energy-dependent TOF was measured for several homogeneous PMMA slabs in order to calibrate the acquired TOF against the corresponding water equivalent thickness (WET). With this calibration, two proton radiographs (pRads) of a small aluminium stair phantom were recorded at MedAustron using 83 MeV and 100.4 MeV protons.Main results: Due to the simplified WET calibration models used in this very first experimental study of this novel approach, the difference between the measured and theoretical WET ranged between 37.09 % and 51.12 %. Nevertheless, the first TOF-based pRad was successfully recorded showing that LGADs are suitable detector candidates for Sandwich TOF-iCT.Significance: While the system parameters and WET estimation algorithms require further optimization, this work was an important first step to realize Sandwich TOF-iCT. Due to its compact and cost-efficient design, Sandwich TOF-iCT has the potential to make iCT more feasible and attractive for clinical application, which, eventually, could enhance the treatment planning quality.

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Section: Tof-ict Demonstratormentioning

confidence: 99%

First experimental time-of-flight-based proton radiography using low gain avalanche diodes

Ulrich-Pur,

Bergauer,

Galatyuk

et al. 2024

Phys. Med. Biol.

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“…Another promising silicon detector type is that of Ultra Fast Silicon Detectors (UFSD) based on thin Low Gain Avalanche Detectors (LGAD). Three examples of applying this detector type in particle therapy applications can be found in [20][21][22]. These detectors can be used for very fast timing applications like time-of-flight detector systems.…”

Section: Alternative Beam Monitoring Concepts and Devicesmentioning

confidence: 99%

A Beam Monitor for Ion Beam Therapy Based on HV-CMOS Pixel Detectors

et al. 2023

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Particle therapy is a well established clinical treatment of tumors. More than one hundred particle therapy centers are in operation world-wide. The advantage of using hadrons like protons or carbon ions as particles for tumor irradiation is the distinct peak in the depth-dependent energy deposition, which can be exploited to accurately deposit doses in the tumor cells. To guarantee this, high accuracy in monitoring and control of the particle beam is of the utmost importance. Before the particle beam enters the patient, it traverses a monitoring system which has to give fast feedback to the beam control system on position and dose rate of the beam while minimally interacting with the beam. The multi-wire chambers mostly used as beam position monitors have their limitations when a fast response time is required (drift time). Future developments such as MRI-guided ion beam therapy pose additional challenges for the beam monitoring system, such as tolerance of magnetic fields and acoustic noise (vibrations). Solid-state detectors promise to overcome these limitations and the higher resolution they offer can create additional benefits. This article presents the evaluation of an HV-CMOS detector for beam monitoring, provides results from feasibility studies in a therapeutic beam, and summarizes the concepts towards the final large-scale assembly and readout system.

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LGAD technology for HADES, accelerator and medical applications

Cited by 2 publications

References 9 publications

First experimental time-of-flight-based proton radiography using low gain avalanche diodes

First experimental time-of-flight-based proton radiography using low gain avalanche diodes

A Beam Monitor for Ion Beam Therapy Based on HV-CMOS Pixel Detectors

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