Giuseppe Pezzullo

Modeling TID Effects in Mach-Zehnder Interferometer Silicon Modulator for HL-LHC Data Transmission Applications

High-speed Mach-Zehnder interferometer silicon modulators were exposed to a total ionizing dose of 1.3 MGy, levels comparable to the worst radiation levels for a tracking detector after 10 years of operation at the High-Luminosity LHC, show a sensitivity to ionizing radiation after exposure to a dose of a few hundred kGy. A physical model to describe the effect of ionizing radiation on the modulators has been developed and is used to predict whether a more radiation-hard modulator can be designed to survive the harshest radiation environments expected at the HL-LHC.

Neutron and X-ray irradiation of silicon based Mach-Zehnder modulators

We report on our recent investigation into the potential for using silicon-based Mach-Zehnder modulators in the harshest radiation environments of the High-Luminosity LHC. The effect of ionizing and non-ionizing radiation on the performance of the devices have been investigated using the 20 MeV neutron beam line at the Cyclotron Resource Centre in Louvain-La-Neuve and the X-ray irradiation facility in the CERN PH department. The devices were exposed to a total fluence and ionizing dose of 1.2×1015 n cm−2 and 1.3 MGy respectively.

Ultrahigh Fluence Radiation Monitoring Technology for the Future Circular Collider at CERN

The future circular collider (FCC) is foreseen as the next-generation ~100-km long synchrotron to be built in the Geneva area starting 2050. This machine is expected to reach an energy level of 100 TeV generating unprecedented radiation levels >100 times higher than in today’s large hadron collider (LHC). Current radiation monitoring system, like the RADMONs employed in the LHC, will not be capable to function and withstand this harsh environment. The development of a new ultrahigh fluence and dose radiation sensor is a key element to allow irradiation tests of FCC equipment and, at a later stage, to monitor radiation levels in the FCC itself. In this paper, we present an innovative dosimetry solution based on thin layers of metals, which resistivity is shown to increase significantly due to the accumulated displacement damage. After describing the fabrication techniques used to manufacture these radiation-dependent resistors, we show and discuss the results of the irradiation experiments carried out with neutrons (up to 1018 n/cm2 at the JSI TRIGA reactor) and with protons (up to 5.2

Effect of Radiation on a Mach–Zehnder Interferometer Silicon Modulator for HL-LHC Data Transmission Applications

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Design of Si-photonic structures to evaluate their radiation hardness dependence on design parameters

p/cm2 at CERN IRRAD Facility) to validate the proposed concept of possible ultrahigh fluence FCC dosimeter.