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KVI - Center for Advanced Radiation Technology Research and education Nuclear and Hadron Physics Research

Nuclear Physics at FAIR – simulations and experimental tests

Contact person: Catherine Rigollet

With the advent of the new radioactive ion beam facility FAIR being built in Darmstadt, Germany, intense beams of exotic ions will allow us to study parts of the nuclides chart unreachable up to now. The region of very neutron-rich nuclei is especially interesting, as the study of these elements can shed light on fundamental questions, such as the origin of the elements, the energy powering the stars and their evolution from birth to their death. The nuclear- and hadron physics group at KVI-CART is involved in the design and manufacturing of parts of the Super Fragment Separator (Super-FRS) beam line and drives the study of a veto detector with the use of simulations.

  1. Thermal simulations . Our group is involved in designing and manufacturing of slit-systems to be installed in the beam line of the super fragment separator. The series of slits are designed to cut the beam horizontally and vertically by means of moving very heavy metal blocks with an accuracy of 0.1 mm. The blocks of the first slit have to sustain a maximum beam power of 500 W. The blocks are operated in vacuum and the electronics (motors and sensors) placed on top of the vacuum chamber must not exceed 80°C. In this project, the student is asked to perform heat simulations of the whole system to assess the temperature of the top plate where the electronics are situated.
  2. Design of beam spot visualization system . At the heart of the Super-FRS, comes the target station where the radioactive, very exotic nuclei are produced. At the point where the primary beam and the target meet, a high radiation environment is created, which no human being is allowed to enter during operation. The design of the target station vacuum chamber includes large amounts of shielding, beam monitoring detectors, the target wheel and a collimator. The online monitoring of the production target (size of the beam spot and temperature) is an important task that needs to be handled remotely. The visualization equipment (IR camera) cannot be placed directly in the chamber but in an area above, where the level of radiation is low. A system of mirrors, therefore, has to be designed, keeping the degradation of the image to a minimum.
  3. NeuLAND veto detector . The NeuLAND detector is a neutron detector wall and an integral part of the R3B (Reactions with Radioactive Relativistic Beams) experiment at FAIR. Upon entering NeuLAND, a neutron will react with a proton from the scintillation material and the light created is detected by photomultipliers. Charged particles entering NeuLAND will trigger a signal that can be mistaken for a neutron signal. In order to keep the charged-particle background to a minimum, a veto detector will be installed in front of NeuLAND. Simulations of the response of the veto detector are performed with the R3Broot software (ROOT + Geant4). The purpose of the project is to provide an independent verification of the results obtained. The student will first do a literature survey about neutron-proton cross sections and energy loss of charged particles in matter. Both will then need to be implemented in a program (Matlab or other) to reproduce the results of the full-blown simulations.
Laatst gewijzigd:23 maart 2016 10:36