Irradiation studies at the Bern cyclotron for the ATLAS ITk upgrade

After Run III the ATLAS detector will undergo a series of upgrades to cope with the harsher radiation environment and increased number of proton interactions in the High Luminosity-LHC. One of the key projects in this suite of upgrades is the ATLAS Inner Tracker (ITk). The pixel detector of the ITk must be read out accurately and with extremely high rate. The Optosystem performs electro-optical conversion of signals from the pixel modules. This paper presents recent results related to the performance of the data transmission chain with a focus on the Optoboards and to the design, testing and production of the Optopanels.

“…Another test is the operation of an Optoboard during irradiation. Results of irradiation tests on previous versions of the Optosystem have been presented in [17,18].…”

Section: Radiation Hardness Tests and System Testsmentioning

confidence: 99%

The Optosystem: validation and testing of the high-speed electro-optical conversion system for the readout of the ATLAS ITk Pixel upgrade

Möbius

2024

“…The Bern Medical Cyclotron was employed in order to verify the radiation resistance of the Optosystem. Previous irradiation studies are reported in [10]. This infrastructure, located at the Bern University Hospital, is primarily used for 18 F production, but it hosts an independently accessible research irradiation bunker which can be used for radiation hardness studies [9].…”

Section: Jinst 18 C03021 4 Test Of the Radiation Hardness Of The Opto...mentioning

confidence: 99%

Test of the Optosystem for the ATLAS ITk data transmission chain

Santo¹,

O’Neill²,

Franconi³

et al. 2023

After Run III the ATLAS detector will undergo a series of upgrades to cope with the harsher radiation environment and increased number of proton interactions in the High Luminosity LHC. One of the key projects in this suite of upgrades is the ATLAS Inner Tracker (ITk). The pixel detector of the ITk must be read out accurately and with extremely high rate. The Optosystem performs electrical-to-optical conversion of signals from the pixel modules. We present a general overview on the design of the Optosystem and recent results related to the performance of the data transmission chain, pivoted on the Optoboards, and to the radiation hardness of the ASICs housed on it.

“…To this end, diverse components such as cable shieldings, connectors and electrical cables have been irradiated. Figure 13 (left) shows the setup used to irradiate the cables connecting the detector front-end modules to the opto-electronic converters [35]. To achieve a uniform dose along the cable length, the cable was wrapped on a spool mounted on a motor, so that the spool could rotate during the irradiation.…”

Section: Examples Of Irradiation Campaignsmentioning

confidence: 99%

A facility for radiation hardness studies based on a medical cyclotron

Anders¹,

Braccini²,

Carzaniga³

et al. 2022

The development of instrumentation for operation in high-radiation environments represents a challenge in various research fields, particularly in particle physics experiments and space missions, and drives an ever-increasing demand for irradiation facilities dedicated to radiation hardness studies. Depending on the application, different needs arise in terms of particle type, energy and dose rate. In this article, we present a versatile installation based on a medical cyclotron located at the Bern University Hospital (Inselspital), which is used as a controlled 18-MeV proton source. This accelerator is used for daily production of medical radioisotopes, as well as for multidisciplinary research, thanks to a 6.5-meter long beam transfer line that terminates in an independent bunker, dedicated only to scientific activities. The facility offers a wide range of proton fluxes, due to an adjustable beam current from approximately 10 pA to the micro-ampere range, together with a series of steering and focusing magnets along the beamline that allow for the beam spot to be focused down to a few mm^2. The beamline can be instrumented with a variety of beam monitoring detectors, collimators, and beam current measurement devices to precisely control the irradiation conditions. The facility also hosts a well equipped laboratory dedicated to the characterisation of samples after irradiation. An experimental validation of the irradiation setup, with proton fluxes ranging from 5×10^9 cm^-2s^-1 to 4×10^11 cm^-2s^-1, is reported.