[postponed]

Giovanni Vecil (University of Trieste)

Location: Swiatecki Lounge B70 annex - 228 

Time: 4:00pm Pacific Time

ZOOM for those who are unable to come in-person: LINK

Host: Zhenyu Ye

[Slide]  [Youtube]

Title: The ALICE 3 Inner Tracker Middle Layers: development of aluminium Flexible Printed Circuits for MAPS sensor modules

Abstract:  ALICE 3 is the next-generation detector for the ALICE experiment at CERN, planned for installation during the LHC Long Shutdown 4 (2034-2035). This contribution focuses on the design and development of the Middle Layers of the ALICE 3 Inner Tracker, comprising five 1.3 m-long barrels at radii between 70 mm and 300 mm, for a total area of about 6 m2, which is covered with reticlesize Monolithic Active Pixel Sensors (MAPS). Their proximity to the interaction point results in high particle hit rates, requiring each sensor to transmit data at a rate of about 1 Gbit/s. At the same time, achieving the desired tracking performance for low-momentum particles constrains the material budget of each layer to below 0.5% X0. These constraints demand extensive R&D across all aspects of detector construction. In particular, a more detailed insight is provided here into the development of low-material-budget solutions for sensor modules based on aluminium Flexible Printed Circuits (FPCs) and their integration with detector services for power distribution and high-speed data transmission over metre-scale distances. The signal integrity studies involve simulations and measurements of the impedance variations along the transmission lines and of scattering parameters. In this way, the FPC design is optimised to be compatible with the requirements posed by the receiver technology employed, as quantified by eye-diagram characteristics and bit-error rate (BER) performance.

[postponed]

Prof. Jen-Chieh Peng  (University of Illinois at Urbana-Champaign)

Location: Swiatecki Lounge B70 annex - 228

Time: 4:00pm Pacific Time

ZOOM for those who are unable to come in-person: LINK

Host: Keh-Fei Liu

Title: Evolution of Helicity Property of Relic Neutrinos and Implications 

on Their Detection

Abstract: Neutrinos in the early Universe decoupled essentially in helicity eigenstates.

As they propagate through the Universe, their helicities could be modified via

two effects. First, neutrinos with a finite magnetic moment would rotate their

spins with respect to their momenta as they encounter cosmic magnetic fields,

modifying their helicities. Second, the bending of neutrino's spin by a

gravitational field lags the bending of its momentum, again modifying its helicity. 

We study both effects and investigate the implications of the

helicity modification on the detection of relic neutrinos using the Inverse

Tritium Beta Decay (ITBD) reaction. We find that the ITBD rate depends

sensitively on the neutrino mass hierarchy and on the Dirac or Majorana nature

of the neutrinos. This talk is based on several papers in collaboration with 

Gordon Baym.