Graduate Seminar, Nov. 29th

Speaker: Oleksandr Kovalenko

Title: Thermal photons as the signature of Quark Gluon Plasma and its thermometer.

Abstract: Direct photon spectrum is a probe to study the thermal properties of the QGP fireball created in ultra relativistic heavy-ion collisions.
A scheme of extracting the direct photon signal from the data will be presented. The current results on thermal photons emitted in heavy ion collisions will be reviewed.

Graduate Seminar, Nov. 22nd

Speaker: Dobromił Załoga

Title: Study of soft X-rays emission from PF-1000U discharges performed during the recent experimental campaign

Abstract: This presentation reports on measurements of soft x-rays emitted from hot plasmas produced in a modernised PF-1000U facility. The discharges were performed at the D2-filling with or without a Ne-admixture, under the initial pressure 0.9 or 1.5 torr and at the initial charging voltage 16 or 18 kV. Time-integrated x-ray images were recorded with a pinhole camera situated side-on at an angle of 75º to the z-axis. Differences in the pinch column structure were observed. Time-resolved measurements were performed with four PIN diodes located behind filtered pinholes. Two couples of PIN diodes (with Be-filters of 7 and 10 um in thickness) observed 30-mm-dia. regions which had a centre at a distance of 30 and 60 mm form the electrode outlets. From the time-resolved signals electron temperatures (Te) were estimated. For the pure D2-discharges the estimated Te values ranged from 75 to 250 eV depending on the discharge conditions. For discharges with a Ne-admixture Te values amounted to above 1 keV.

Graduate Seminar, Nov. 15th

Speaker: Michał Palczewski

Title: Present state of knowledge about physical properties of superheavy elements

Abstract: Development of knowledge about existence and properties, both physical and chemical, of superheavy elements (SHN) can be seen in different aspects. Recently (8.11.2016) four last elements gained their names. Also all the time number of produced isotopes of SHN is increasing, allowing to improve our theoretical models. At the same time nuclear physicists attempt to get elements from outside known periodic table (it means heavier than Og – element 118). During the presentation I would like to shortly remind basic information about SHN, say about recently named elements and efforts to get new one and also present recent detailed illustration of accuracy of presently used nuclear-mass models.

 

Graduate Seminar on Nov. 8th

Speaker: Katarzyna Frankiewicz

Title: Search for dark matter induced neutrinos with the Super-Kamiokande detector.

Abstract: The indirect search for neutrinos from dark matter annihilation in the Earth core will be presented. In this analysis we use atmospheric neutrino data collected with the Super-Kamiokande (SK) detector in years 1996-2016. Analysis method is based on detailed simulation of signal (neutrinos from dark matter annihilation) and background (atmospheric neutrinos) for the SK detector. Angular distributions and energy spectra as expected for signal and background are taken into account. Various dark matter annihilation channels and wide range of relic particle masses are considered. Based on the global fit of a simulated signal and background to the data, allowed number of dark matter induced neutrinos contained in SK data can be constrained. Obtained limits on dark matter induced neutrino flux are related to limit on spin-independent WIMP-nucleon cross section and compared against results of direct detection experiments.

Venue: Room 22, Tuesday Nov. 8th 2016, 9:00 A.M.

Graduate Seminar, Oct. 25th

Speaker: Jakub Sierchuła

Title: “Multi-criterial comparative analysis of the generating units at nuclear and conventional power plants on selected examples”

Abstract: The talk presents a comparative analysis of nuclear power plant with the conventional coal-fired power plants on hard coal and ignite. It focuses on the structure and principle of operation of the abovementioned units, specified their parameters and appointed their main technical and economic indicators. It contains specific description of nuclear units, wherein the nuclear power plant with AP1000 reactor was described, starting with general information, through the characteristics of thermal cycles, structural elements, auxiliary devices and fuel cycle. The next part presents construction and explains the principle of work of supercritical steam units. As an example of these kind of units there are presented two supercritical power plants: Jaworzno III and Belchatow. Both units have been described in detail, including their parameters and devices’ characteristics. Analysis focuses on the thermodynamic, operational, environmental and economic factors.

Venue: Room 22, Tuesday Oct. 25th 2016, 9:00 A.M.