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Magnetic triggering — time-resolved characterisation of silicon strip modules in the presence of switching DC-DC converters

DOI: 10.1088/1748-0221/16/06/P06012 DOI Help

Authors: A. J. Blue (University of Glasgow) , B. Gallop (STFC Rutherford Appleton Laboratory) , T. Heim (Lawrence Berkeley National Laboratory) , C. Helling (University of California Santa Cruz) , K. Krizka (Lawrence Berkeley National Laboratory) , B. Li (Lawrence Berkeley National Laboratory; Tsinghua University) , C. Labitan (Lawrence Berkeley National Laboratory) , E. Mladina (Lawrence Berkeley National Laboratory) , L. Poley (Simon Fraser University; TRIUMF) , P. W. Phillips (STFC Rutherford Appleton Laboratory) , S. N. Santpur (Lawrence Berkeley National Laboratory) , C. A. Sawyer (STFC Rutherford Appleton Laboratory)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Instrumentation , VOL 16

State: Published (Approved)
Published: June 2021
Diamond Proposal Number(s): 22002

Open Access Open Access

Abstract: Modules for the ATLAS Inner Tracker (ITk) strip tracker include a DC-DC converter circuit glued directly to the silicon sensor which converts the 11 V supplied to the module to the 1.5 V required for the operation of the readout chips. The DC-DC converter unit, consisting of a copper solenoid and custom ASIC, is located directly above the silicon strip sensor and therefore needs to be shielded to protect the sensor from EMI noise created during the operation of the circuit. Despite dedicated shielding, consisting of an aluminium shield box with continuous solder seams encompassing the surface components and a copper layer in the PCB beneath it, module channels connected to sensor strips located beneath the converter circuit were found to show a noise increase. While the DC-DC converter unit causing the underlying EMI noise operates at a frequency of 2 MHz, module characterisation measurements for ITk strip tracker modules are typically performed asynchronously to the DC-DC switching and are therefore averaged over the full range of time bins with respect to the converter frequency. In order to investigate the time dependence of the noise injection relative to the DC-DC switching frequency, a dedicated setup to understand the time-resolved performance change in modules was developed. By using a magnetic field probe to measure the field leaking through the shield box and triggering on its rising edge, data taking could be synchronised with the DC-DC switching. This paper illustrates the concept and setup of such time-resolved performance measurements using magnetic triggering and presents results for the observed effects on signal and noise for ATLAS ITk strip modules from both laboratory and beam tests.

Journal Keywords: Data acquisition concepts; Digital electronic circuits; Particle tracking detectors; Si microstrip and pad detectors

Subject Areas: Physics, Engineering


Instruments: B16-Test Beamline

Documents:
Blue_2021_J._Inst._16_P06012.pdf

Discipline Tags:

Engineering & Technology Detectors Physics Electronics

Technical Tags:

Diffraction