M. Borri

Test beam results of 3D silicon pixel sensors for the ATLAS upgrade

Results on beam tests of 3D silicon pixel sensors aimed at the ATLAS Insertable B-Layer and High Luminosity LHC (HL-LHC) upgrades are presented. Measurements include charge collection, tracking efficiency and charge sharing between pixel cells, as a function of track incident angle, and were performed with and without a 1.6 T magnetic field oriented as the ATLAS inner detector solenoid field. Sensors were bump-bonded to the front-end chip currently used in the ATLAS pixel detector. Full 3D sensors, with electrodes penetrating through the entire wafer thickness and active edge, and double-sided 3D sensors with partially overlapping bias and read-out electrodes were tested and showed comparable performance.

A 128-channel event driven readout ASIC for the R3B tracker

R3B is a detector with high efficiency, acceptance, and resolution for kinematically complete measurements of reactions with high-energy radioactive beams. Detectors track and identify radioactive beams into and out of a reaction target. Three layers of double-sided stereoscopic silicon strips form the tracker detector which must provide precise tracking and vertex determination and in addition include energy and multiplicity measurements. The R3B ASIC has been manufactured and is intended for processing and digitising signals generated by ionising particles passing through the tracker. The ASIC processes signals and provides spatial, energy and time measurements.

A readout ASIC for the R 3 B silicon tracker

A 128-channel event-driven ASIC is described which reads out the R3B (Reactions with Relativistic Radioactive Beams) silicon micro vertex tracker. Ionizing particles with energies in the range of 40keV-50MeV are detected, digitized and read out with 12 bit resolution, and time stamped with up to 5ns precision. The ASIC copes with signal charges and detector leakage currents of both polarities and allows charge sharing to be taken into account by reading out the charge from neighboring channels. The ASIC can recover quickly from signals up to 1Gev, can store up to 32 events and can be easily daisy-chained to reduce parallel connections. Outputs can be Manchester encoded to allow for capacitive coupling of the data, and a 128-bit OR of all the channel hits provides a fast trigger output.