Seminars
24. 1. 2019. The MoEDAL Experiment at the LHC - Searching for Physics Beyond the Standard Model
Speaker: Dr. Matti Kalliokoski, Ruđer Bošković Institute
Location: Wing 1 lecture room (Supek), RBI
Participants: RBI and project staff
Abstract:
MoEDAL is a pioneering experiment designed to search for highly ionizing messengers of new physics such as
magnetic monopoles or massive (pseudo-)stable charged particles, that are predicted to exist in a plethora
of models beyond the Standard Model. It started data taking at the LHC at a centre-of-mass energy of 13 TeV,
in 2015. MoEDAL’s ground breaking physics program defines a number of scenarios that yield potentially
revolutionary insights into such foundational questions as: are there extra dimensions or new symmetries;
what is the mechanism for the generation of mass; does magnetic charge exist; and what is the nature of dark
matter. MoEDAL’s purpose is to meet such far-reaching challenges at the frontier of the field.
The innovative MoEDAL detector employs unconventional methodologies tuned to the prospect of discovery physics. The largely passive MoEDAL detector, deployed at Point 8 on the LHC ring, has a dual nature. First, it acts like a giant camera, comprised of nuclear track detectors – analyzed offline by ultrafast scanning microscopes with various pattern recognition and machine learning methods. Second, it is uniquely able to trap the particle messengers of physics beyond the Standard Model for further study. MoEDAL’s radiation environment is monitored by a state-of-the-art real-time TimePix pixel detector array.
I will present an overview of the MoEDAL detector, including the planned upgrades with MAPP and MALL sub-detectors, as well as MoEDAL’s physics program. I will also show some highlights of the physics results on Magnetic Monopole production, that are the world’s best for Monopoles with multiple magnetic charge.
MoEDAL detector at the LHC.
24.-25. 10. 2018. Workshop on silicon photomultipliers and on dosimetry techniques in radiotherapy
Speakers: Prof. Massimo Caccia, Dr. Romualdo Santoro, and Samuela Lomazzi, Università degli Studi dell’Insubria
Location: On 24.10. Wing 1 lecture room (Supek) at 10 am, and on 25.10. Wing 3 lecture room at 3 pm.
Wed 24.10.
Introduction to Silicon Photomultipliers, M. Caccia
Abstract
Part 1
Part 2
Demonstration of SiPM start kit by CAEN s.p.a.
SP5600AN Educational Kit - Premium Version at CAEN web page
Thu 25.10.
Fibre sensors for in vivo dosimetry during radiotherapy, S. Lomazzi
Abstract
Presentation
Silicon Photomultiplier based dual-readout fibre calorimeter: firsts results and the pathway beyond the proof-of-concept, R. Santoro
Abstract
Presentation
4. 9. 2018. Development of Novel Semiconductor Detectors In Xiangtan University
Speaker: Prof. Zheng Li, Xiangtan Technical University (XTU)
Location: Wing 1 lecture room (Supek), RBI
Participants: RBI and project staff
Abstract:
Development of novel large area Si drift detectors (SDD) and 3D-Trench-Electrode detectors have been carried
out in Xiangtan University. These detectors are applied for X-ray and particle detection in the field of high
energy physics, photon science, and space applications. Large area (600 mm2 and 314 mm2) SDD detectors have
simulated, designed in Xiangtan University, and been fabricated in its new Class-100 cleanroom high resistivity
Si detector processing facility. Simulations on the the new 3D-Trench-Electrode detectors have been carried out,
and results have shown great radiation hardness as compared to convention 2D planar detectors. Leakage current
and capacitance measurements have shown good results. Laser scan tests on the new 3D-Trench-Electrode detectors
have shown good sensitivity and good pixel separation.
RBI-XTU drift detector mask design.
27. 2. 2018. The basics of Geant4 and possible applications
Speaker: Dr. Matti Kalliokoski, Ruđer Bošković Institute
Location: Van de Graaff seminar room, RBI
Participants: RBI and project staff
Abstract:
Geant4 is a C++ based simulation toolkit that is used widely in design and analysis
of high energy physics experiments, in space and radiation applications, and in medical physics.
It can be used to simulate the passage of particles through matter. Geant4 physics processes describe
electromagnetic and nuclear interactions of particles with matter, at energies from eV to TeV. In this
seminar presentation I will briefly go through the basics of Geant4 toolkit, and show some applications
from various fields from accelerator physics to space environment.
Geant4 simulation of a gearbox irradiated with neutrons.
26. 1. 2017. Alpha-screening of contaminated curved objects with flexible silicon
Speaker: Dr. Christian Schuster, University of York
Location: RBI
Participants: RBI and project staff
Abstract:
The detection of alpha radiation in the field can be challenging due to their short range, which is
typically only some centimeters in air. This problem is exacerbated inside contaminated pipeline systems
in the nuclear industry: there is currently no low cost solution available for measuring low levels of
alpha-contamination, like Pu-239, inside pipes, because cutting a long pipework into segments is expensive
and, therefore, incompatible for the inspection.
While previous methods mainly focused on indirect techniques, I will propose a novel approach based on a flexible sheet of 50 µm thin crystalline silicon. Following established fabrication steps of pn-junction diodes, we observe a very clear response to 5 MeV alpha-particles using a bespoke amplifier circuit. As a flexible detector offers 360-degree equidistant surface coverage and is able to adapt to the curvature of a given pipeline, I will show that our prototype device stands out as a low-cost and efficient solution for nuclear decommissioning.
Even if the sensor is aimed at the specific problem of assessing radioactive contamination in narrow pipe work, it can generally be adapted to a curved surface, such as barrels for contaminated waste. In my talk, I would like to discuss how it can also address requirements of nuclear and particle physics experiments.
Crystalline silicon wafers become flexible at ca. 70 µm thickness. Accordingly, they can be bent to be used for screening the inner surface of a 2” diameter pipe for alpha-contamination and be mounted on an elastic inspection gauge.