Instruments and Methods in Nuclear, Particle, and Astroparticle Physics
The scope of activities of the group spans from cosmic ray experiment EMMA to T0 and FIT fast timing detectors for ALICE experiment at CERN, and Nuclear Reaction studies at the K130 cyclotron at JYFL. R&D on neutrino detectors is presented in the Neutrino Physics section.
Contact person: Wladyslaw Trzaska
- Group members »
- Wladyslaw Henryk Trzaska, senior scientist
- Kai Loo, doctoral student
- Maciej Slupecki, doctoral student
- Johannes Hissa, doctoral student (Oulu University)
- Yerzhan Mukhamejanov doctoral student (Almaty University, Kazakhstan)
- Antto Virkajärvi, student (Lappeenranta Technical University)
- Roope Sarala, student
- Jukka Sorjonen, student
- Giovanni Misitano, student
- Heidi Rytkönen, student
- Samuel Tod, summer student, 01.06.-31.08.2016
- Victor Couderc, summer student, 01.06.-31.08.2016
- Pierre Boisseau, summer student, 01.06.-31.08.2016
- Jeremy Castarede, summer student, 01.06.-31.08.2016
- Orest Malinovskiy, summer student, 01.06.-31.08.2016
- Grigori Tiurin, visiting researcher (Radium Institute, Russia)
- Recent research
- ALICE T0 and FIT detectors »
With rapidly approaching start of the Long Shutdown 2 (LS2), the work on the new Fast Interaction Trigger (FIT) for the upgrade of the ALICE experiment continues to dominate the activity of our group.
The 2019-20 upgrade of the CERN LHC injectors will boost the luminosity and the collision rate beyond the design parameters for several of the key ALICE detectors including the forward trigger detectors. FIT is being designed to remedy this problem. FIT will replace T0, V0, and FMD detectors to become the main forward trigger, luminometer, and collision time detector. It will also determine multiplicity, centrality, and reaction plane of heavy ion collisions. The first prototype of the Cherenkov module together with the frontend electronics is already installed and in operation at ALICE. The concept of the new detector and the first test results were presented at several conferences in 2016 including the 14th Vienna Conference on Instrumentation and the 38th International Conference on High Energy Physics.
- Nuclear reactions »
The highlight of the year was EXON 2016 – the VIII International Symposium on EXOtic Nuclei held on 4-10 September in Kazan. In total there were 8 oral and 16 posters presented by members of our Russian – Finnish collaboration.
We have reactivated the sample shuttle for activity measurements following neutron irradiations. This system has worked well during several experiments. The latest, conducted in the summer, yielded cross section of the 18O(n,alpha)12C reaction. The measurement was a first step towards a future radioactive beam of 15C (T½ = 2.5 s). The required neutron fluxes were generated by 22 – 55 MeV deuterons on 12C and D2O converters. The resulting neutron spectra were unfolded using known cross sections of neutron-induced reactions on elements producing suitable gamma-decay signatures. For that reason several metallic foils were activated in addition to H2O samples 80% enriched in 18O.
- EMMA experiment »
Despite lack of direct funding EMMA continues taking data. All 11 stations are now completed and 7 are connected to the DAQ. The main emphasis is on the data from the three central tracking stations. We have finalized a code to analyze muon arrival direction and multiplicity, and a code to monitor detector efficiency and correct for air pressure changes. Also a code to determine the muon multiplicities with SC16 scintillator detector has been completed and is being used to determine single-muon flux at the depth of 75 meters. Part of the SC16 detectors is still in Canfranc Underground Laboratory in Spain measuring directional muon flux at two locations at the depth of approximately 900 meters.
In 2016 the Center of Underground Physics in Pyhäsalmi was a training base for eight summer students (5 from France, 2 from Finland, 1 from Poland) and a venue for four international workshops. Our R&D on neutrino detectors at CUPP is presented in the Neutrino Physics section.
- ALICE T0 and FIT detectors »