Radiation-hard power electronics for the ATLAS New Small Wheel

Abstract

Endcap muon tracking and triggering: 1.3 ≤ |η| ≤ 2.7. Replace for L = 5 × 10 34 cm −2 s −1. Power: at least 30 kA at 1.2 V −→ Point-of-Load conversion. Nominal architecture: buck converters feeding low-dropout regulators (LDOs) Need B-field, radiation tolerant power converters. ���������������� ������������������ Figure 1.2: A z-y view of 1/4 of the ATLAS detector. The blue boxes indicate the end-cap Monitored Drift Tube chambers (MDT) and the yellow box in the Small Wheel area the Cathode Strip Chambers (CSC). The green boxes are barrel MDT chambers. The trigger chambers, Resistive Plate chambers (RPC) and Thin Gap Chambers (TGC), are indicated by the outlined white and the magenta boxes. This is a cutout on the muon spectrometer at the large sectors, hence the names 'End-cap Inner Large' (EIL), 'End-cap Middle Large' (EML) and 'End-cap Outer Large' (EOL). The detector regions of the Small Wheel and Big Wheel are also outlined.

Radiation hardness study for the COMET Phase-I electronics

“…These results also show that the voltage drop in the voltage regulators decreased from gamma-ray irradiation before complete failure. The result for LT8612 is consistent with the study by the ATLAS New Small Wheel group [8], but the one for ADP1755 is different from that study. The ATLAS group used a 220 MeV proton beam, and its energy deposition on the regulator is different from the case of gamma-ray irradiation.…”

Calliope 60Co gamma irradiation facility for space qualification at ENEA-casaccia research centre (Rome)

“…43,44 At Calliope facility it is possible to perform ionizing damage test on electronic components according to MIL-STD-883E and/or ESCC BASIC SPECIFICATION No.22900 Issue 5 procedures. 5,[45][46][47][48] Since 2018, The Calliope facility is indicated by the Italian Space Agency ASI as "ASI Supported Irradiation Facility" (ASIF Programme) recommended by the ESA, for carrying out the activities and the qualification tests for Space. The characterization analyses are carried out at the Calliope facility laboratory to investigate the gamma radiation effects induced in different materials.…”

Quality Assurance and Testing of the Atlas Liquid Argon Calorimeter Power Distribution Boards

“…The LHC4913 is a positive Voltage Regulator that has a fixed output voltages: 2.5 V, 3.0 V, 3.3 V, 5.0 V or 8.0 V and an input voltage ranging from 3 V to 12 V. The LHC7913, instead is a negative Voltage Regulator with an input voltage range from -3 V to -9 V. The LHC4913 is also used to generate +2.5 V, starting from the +6 V of the power bus, (with an intermediate step down at +4 V, using an LTM4916, to avoid a large voltage drop on the LDO). The PDB is radiation tolerant [4]- [6] and able to operate in presence of maximum magnetic field expected in the LTDB position (lower than 0.1 T) [7]. The radiation tolerance requirements for the PDB are less stringent than for the rest of the LTDB component since the board will have to operate only for the LHC Run 3 and will be replaced before the start of the HL-LHC.…”