Graduate Program Events |
Events During the Week of August 25th through September 1st, 2024
Sunday, August 25th, 2024
- Graduate School Summer 2024: Doctoral degree deadline
- Time: 11:55 pm - 12:55 am
- Abstract: CONTACT: 262-2433, gsacserv@grad.wisc.edu
Monday, August 26th, 2024
- Graduate School Fall 2024: Fall Degree Window Period begins
- Abstract: CONTACT: 262-2433, gsacserv@grad.wisc.edu
- Incoming PhD Orientation and Welcome
- Time: 9:00 am - 12:30 pm
- Place: 2241 Chamberlin
- Speaker: various
- Host: Sharon Kahn
Tuesday, August 27th, 2024
- Cosmology and HI Intensity Mapping
- Time: 1:00 pm - 3:00 pm
- Place: Sterling Hall, Room B343
- Speaker: John Podczerwinski, Physics PhD Graduate Student
- Abstract: This thesis is focused on the HI intensity mapping technique. I begin by reviewing basic cosmological theory and common observational techniques such as galaxy surveys and CMB studies. I then provide motivation for the use of HI intensity mapping along with a description of how such measurements are performed. I describe my research work, in particular the design of an ultra-wideband antenna and the development of foreground cleaning techniques. For the antenna project, I created an ultra-wideband design that was optimized with intensity mapping systematics in mind. This involved the use of a Vivaldi feed with optimized profile and a deep dish with and an elliptical collar. I also investigated the use of absorbers, which helped mitigate systematics but resulted in significantly lower sensitivity. The final antenna design achieved satisfactory levels of spectral smoothness, impedance matching and sensitivity to the 21cm hydrogen line. In simulations, I found that my design efforts helped reduce coupling between neighboring antenna elements, though not to the level desired. For the foreground cleaning projects, I investigated the use of Karhunen-Loève transforms in both map-space and visibility space. My project was the first to incorporate a KL transform in map space. This work however, did not seem to provide a substantial improvement over other available methods. I then conclude by discussing my opinions of and ideas for the future of HI intensity mapping.
- Host: Peter Timbie
Wednesday, August 28th, 2024
- All grad lunch/recess
- Time: 11:30 am - 1:00 pm
- Place: Bascom Hill (rain location: Birge Hall atrium)
- Abstract: All graduate students (MS and PhD, new and continuing) are invited to join for a picnic lunch. Watch for an opportunity to RSVP in the weeks leading up to the event.
- Host: Sharon Kahn
Thursday, August 29th, 2024
- Qualifying Exam - Classical Mechanics
- Time: 9:00 am - 10:30 am
- Place: 2241 Chamberlin
- Host: Sharon Kahn
- Qualifying Exam - Statisical Mechanics
- Time: 11:30 am - 1:00 pm
- Place: 2241 Chamberlin
- Host: Sharon Kahn
Friday, August 30th, 2024
- Qualifying Exam - Electricity and Magnetism
- Time: 9:00 am - 10:30 am
- Place: 2241 Chamberlin
- Host: Sharon Kahn
- Qualifying Exam - Quantum Mechanics
- Time: 11:30 am - 1:00 pm
- Place: 2241 Chamberlin
- Host: Sharon Kahn