Dr. Sebastian H. Trippel

Team Leader

Center for Free-Electron Laser Science (CFEL)
Deutsches Elektronen-Synchrotron DESY
Notkestrasse 85 (building 99, room O3.013)
22607 Hamburg
Germany

Imaging chemical dynamics

sebastian.trippel@cfel.de

+49-40-8998-6331

+49-40-8994-6331

Research

My research is focused on internal rearrangement processes of small molecules in the gas phase, such as cis- trans-isomerization and the dynamics of laser alignment and mixed field orientation. Quantum-state-selected molecules are fixed in space with moderately strong laser fields and the degree of orientation is probed via Coulomb explosion in combination with velocity-map imaging. We will gain dynamical information on how molecules are changing their structure upon laser excitation by mapping the photoelectrons on a position sensitive detector.

Curriculum Vitae

since Nov. 2010	Postdoctoral research, Center for Free Electron Laser Science (CFEL), DESY, Hamburg, Germany
May 2005–Jul. 2010	Dissertation, Albert-Ludwigs-Universität Freiburg, Germany
Okt. 2003–Mar. 2005	Diploma, Albert-Ludwigs-Universität Freiburg, Germany

Publications

CFEL Home

Next seminars

No events scheduled.

Timepix3: single-pixel multi-hit energy-measurement behaviour

13 November 2024

The event-driven hybrid-pixel detector readout chip, Timepix3, has the ability to simultaneously measure the time of an event on the nanosecond timescale and the energy deposited in the sensor. However, the behaviour of the system when two events are recorded in quick succession of each other on the same pixel was not studied in detail previously. We present experimental measurements, circuit simulations, and an empirical model for the impact of a preceding event on this energy measurements, which can result in a loss as high as 70%. Accounting for this effect enables more precise compensation, particularly for phenomena like timewalk. This results in significant improvements in time resolution — in the best case, multiple tens of nanoseconds — when two events happen in rapid succession.

Keynote lecture at Sino-German Physics Conference

20 October 2024

Jochen presented a keynote lecture on CMI research at the 33rd Annual Meeting of the Chinese Society of Physicists in Germany (GCPD) in Jinan, Shadong, China. The lecture was well attained locally and, according to the organizers, followed by more than 10,000 people in the koushare online stream.

Recent Publications