High rate particle tracking and ultra-fast timing with a thin hybrid silicon pixel detector (original) (raw)

2013, Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

Time Resolution of an Irradiated 3D Silicon Pixel Detector

Instruments

We report on the measurements of time resolution for double-sided 3D pixel sensors with a single cell of 50 μm × 50 μm and thickness of 285 μm, fabricated at IMB-CNM and irradiated with reactor neutrons from 8 ×1014 1MeV neq/cm2 to 1.0 ×1016 1MeV neq/cm2. The time resolution measurements were conducted using a radioactive source at a temperature of −20 and 20 °C in a bias voltage range of 50–250 V. The reference time was provided by a low gain avalanche detector produced by Hamamatsu. The results are compared to measurements conducted prior to irradiation where a temporal resolution of about 50 ps was measured. These are the first ever timing measurements on an irradiated 3D sensor and which serve as a basis for understanding their performance and to explore the possibility of performing 4D tracking in high radiation environments, such as the innermost tracking layers of future high energy physics experiments.

An ultra fast silicon pixel detector for the NA62 experiment: the Gigatracker

The beam spectrometer of the NA62 experiment has to sustain high and non-uniform beam rate (∼1.5 MHz/mm2 in the hot center and 0.8-1.0 GHz in total, hence the name Gigatracker) and should preserve beam divergence and limit beam hadronic interactions. The Gigatracker has to provide precise momentum, time and angular measurements on every single track of the sec- ondary 75 GeV/c hadron beam with a timing precision of 150 ps (rms). To meet these require- ments, three hybrid silicon pixel detector stations will be installed in vacuum. An adequate strat- egy to compensate the discriminator time-walk must be implemented and R&D investigating two different options is ongoing. Two prototypes have been designed in order to have an experi- mental comparison of the performances: one approach is based on the use of a constant-fraction discriminator followed by an on-pixel TDC, while the other one is based on the use of a Time- over-Threshold circuit followed by a TDC shared by a group of pixels.

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