Neutron-Irradiation Testing of FPGA-Embedded Hadron Fluence Sensors

Neutron flux Measurement at Tapiro fast reactor for APD’s Irradiation fluence evaluation

The Avalanche Photodiodes (APD) were chosen as photon sensors for the barrel region of the CMS electromagnetic calorimeter. The LHC will be a hard environment for what concerns the radiation levels in the detectors. The most relevant damage on APDs is caused by neutrons that produce an increase in the dark current of these devices. In the CMS-ECAL collaboration a big effort was indeed done to u...

BIST-BASED Group Testing for Diagnosis of Embedded FPGA Cores

A group testing-based BIST technique to identify faulty hard cores in FPGA devices is presented. The method provides for isolation of faults in embedded cores as demonstrated by experiments on the Virtex-5 family of Xilinx FPGAs. High-level HDL code is developed to instantiate a Finite State Machine (FSM) which generates the test inputs for the Blocks Under Test (BUTs). The BUTs are divided int...

Development of a High Fluence Neutron Source for Nondestructiv

Neutron irradiation of SmFeAsO1−xFx

SmFeAsO1−xFx was irradiated in a fission reactor by a fast (E > 0.1 MeV) neutron fluence of 4 × 1021 m−2. The introduced defects increased the normal state resistivity due to a reduction in the mean free path of the charge carriers. This leads to an enhancement of the upper critical field at low temperatures. The critical current density within the grains, Jc, increases upon irradiation. The se...

Embedded Control Using FPGA

FPGA stands for Field Programmable Gate Array. It is an integrated circuit that can be configured by the user in order to implement digital logic functions of varying complexities. FPGA can be very effectively used for control purposes in processes demanding very high loop cycle time. The implementation of a digital controller in a FPGA can be parallel,resulting in very high speeds of operation...