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Dr. rer. nat. Andreas Frei

Photo von Dr. rer. nat. Andreas Frei.
Phone
+49 89 289-14260
Room
E-Mail
andreas.frei@tum.de
Links
Homepage
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Group
Research Neutron Source FRM II
Additional Info
Büro: UCN-Labor Am Coulombwall 6 - Rückseite 85748 Garching

Offered Bachelor’s or Master’s Theses Topics

Aufbau eines 4He Gas Reinigers

Outline, calculation and design of a purification cryostat to produce isotopically pure He-4 out of natural helium in a continuous manner based on the superfluid heat flush principle.

The FRM II is presently testing and will subsequently install a source to produce ultra-cold neutrons (UCN) in the reactor. In the central section of this UCN source, helium is used for cooling. By passing through, the cooling agent helium will be irradiated by neutrons, which create radioactive tritium out of the He-3 portion. This negative side effect can be avoided respectively reduced to a permissible level if isotopically purified He-4 with no traceable He-3 content is used.

Sources for isotopically pure He-4 are scarce and availability varies with market demand. In order to ensure continuous operation of the UCN source the availability must be secured. For this reason such an isotopic purifier shall be build.

In this thesis a small illustrator shall be build up, and its cool down characteristics shall be measured.

Contact / Supervisor:

Dr. Andreas Frei, Tel. 089 289 14260, andreas.frei@tum.de

suitable as
  • Bachelor’s Thesis Physics
Supervisor: Stephan Paul
Auslegung, Simulation und Design eines He Gas Reinigers zur Produktion von isotopenreinen He-4 mittels superfluider Wärmeströmung.

The FRM II is presently testing and will subsequently install a source to produce ultra-cold neutrons (UCN) in the reactor. In the central section of this UCN source, helium is used for cooling. By passing through, the cooling agent helium will be irradiated by neutrons, which create radioactive tritium out of the He-3 portion. This negative side effect can be avoided respectively reduced to a permissible level if isotopically purified He-4 with no traceable He-3 content is used.

Sources for isotopically pure He-4 are scarce and availability varies with market demand. In order to ensure continuous operation of the UCN source the availability must be secured. For this reason such an isotopic purifier shall be build.

In the first phase a smaller illustrator shall be designed and made to prove feasibility and validate the concept. The above master thesis is part to this first phase.

In a second phase a scaled-up apparatus shall be manufactured for operational use.

Contact / Supervisor:

Dr. Andreas Frei, Tel. 089 289 14260, andreas.frei@tum.de

suitable as
  • Master’s Thesis Nuclear, Particle, and Astrophysics
  • Master’s Thesis Applied and Engineering Physics
Supervisor: Stephan Paul
Simualtion eines 4He Gas Reinigers mit COMSOL

Outline, calculation and design of a purification cryostat to produce isotopically pure He-4 out of natural helium in a continuous manner based on the superfluid heat flush principle.

The FRM II is presently testing and will subsequently install a source to produce ultra-cold neutrons (UCN) in the reactor. In the central section of this UCN source, helium is used for cooling. By passing through, the cooling agent helium will be irradiated by neutrons, which create radioactive tritium out of the He-3 portion. This negative side effect can be avoided respectively reduced to a permissible level if isotopically purified He-4 with no traceable He-3 content is used.

Sources for isotopically pure He-4 are scarce and availability varies with market demand. In order to ensure continuous operation of the UCN source the availability must be secured. For this reason such an isotopic purifier shall be build.

In this thesis the thermodynamical properties of the purifier shall be simulated with COMSOL.

Contact / Supervisor:

Dr. Andreas Frei, Tel. 089 289 14260, andreas.frei@tum.de

suitable as
  • Bachelor’s Thesis Physics
Supervisor: Stephan Paul
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