P-58

Extreme-performance diagnostics in time-and-space forsources emitting terahertz transients[1] Organization
Project Leader：Dr. Bründermann, Erik
Karlsruhe Institute of Technology (KIT),
Institute for Photon Science and Synchrotron
Radiation (IPS)
Building 345, Room 217 (B345 R217)
Hermann-von-Helmholtz-Platz 176344 Eggenstein-Leopoldshafen, Germany
Representative at RIE：Prof. Hiroshi Inokawa
Research Institute of Electronics Shizuoka
UniversityAdvanced
Device Research
Division
Nanosystem Integration Laboratory
Shizuoka University
3-5-1 Johoku, Naka-ku, Hamamatsu, Shizuoka
432-8011, Japan
Participants：Prof. Norihisa Hiromoto Ph.D.
Terahertz Vision Laboratory,
Department of Nanovision Technology,Graduate School of Science and Technology,
Shizuoka University
3-5-1 Johoku, Naka-ku, Hamamatsu, Shizuoka
432-8011, Japan[2] Research Progress
The research objective is to explore new methods(extreme-performance imaging) and for shorttimes (e.g., EO-sampling, streaking techniques,terahertz diagnostics). The period of thecollaborating research project: 2015 May 29 to2016 March 6.
The department of Accelerator Research at
KIT is exploring new ways to detect single shortelectron bunches consisting of relativistic
electrons by direct diagnostics or indirectly via
the short emitted photon pulses consisting ofTHz transients in the sub-ps to fs time scale.

This requires extreme-performance diagnostics
for new generations of electron accelerator-basedsources. FLUTE (Ferninfrarot Linac- Und Test
Experiment) is a linear accelerator-based (linac)
and test experiment for accelerator research andtechnology, currently under construction at KIT,
which is planned to provide short pulses,
initially tens of fs within the next year 2016,
with the goal to reach ultimately 1 fs and withvery high intensity and electric fields potentiallyin the GV/m range with emission frequencies,initially, in the terahertz frequency range.
The intention of the collaborative research isto explore and develop new detection andimaging technologies in the terahertz range at
RIE at Shizuoka University, which can beemployed at the FLUTE facility at KIT for
diagnostics and as proof-of-principle for suchradiation sources.
The short pulses in the time-domain andsubsequently broad spectral coverage in thefrequency-domain suggest that array technology
with a pre-set splitting of spectral components
by a grating or by filters or antennas directly
mounted on each pixel element, similar to afilter bank, are most suitable, for details see
publication (1) listed under section [4] of thisreport.
[3] Results(3-1) Research results
Within the research period E. Bründermann, H.
Inokawa and N. Hiromoto in Shizuoka University,
explore scientific concepts to detect single shortpulses from sub-ps to the fs timescale andpossibilities to image short terahertz transientsand signatures in time and space.
Initial discussions showed that very shorttransients could be mapped form the time domain
to the frequency domain, which could bemeasured by a detector line array. The detector
elements will be developed and tested by thecollaborators at Shizuoka University. He andcollaborators in Shizuoka University do basic
experiments on terahertz imaging, detector
performance and have meetings to discuss thenew techniques for diagnostics and imaging intime-and-space for sources emitting terahertz
transients.
For the purpose of a personal exchange E.
Bründermann visited the Research Institute ofElectronics during the period from Aug 30th toSep 5th, 2014.
Also during the visit the collaboratorspresented and published, in form of extended
Abstracts and presentations, discussion points
and initial results within the FTT2015
symposium held at Hamamatsu, see publications(1) and (2) listed under section [4] of this report.
(3-2) Ripple effects and further developments
If more final new results of the research on
imaging of terahertz transients manifest, thenthey will be published as an academic journal
paper. It is expected to develop suitable detectors
for the research goals, initially during theresearch period, one high-performance terahertz
detector.
In continuing research periods it is expected todevelop
twodetectors
forbalancing
measurements and an initial small line array. It
is also expected, at a later stage, to employ thesedetectors at the FLUTE facility at KIT and test
their performance. The scientific discussions areexpected to lay the ground for negotiations of alonger term collaborative research to develop newtypes of diagnostics for electron accelerator andshort pulse terahertz photon sources.
The collaborative work in this program includes
discussions to negotiate an agreement on
academic exchange and cooperation in form of a
Memorandum of Understanding (MOU) between
Karlsruhe Institute of Technology (KIT),
Germany, and Shizuoka University, Japan,
including the Institute for Photon Science andSynchrotron Radiation (IPS) and the ResearchInstitute of Electronics (RIE).
[4] Achievements (List of Publications)(1) E. Bründermann, A.-S. Müller, H. Inokawa
and N. Hiromoto, "Terahertz diagnostics ofultra-short pulses at high repetition rates from
relativistic electron sources," The Second
International Symposium on Frontiers in THz
Technology(FTT2015), (Congress Center in ACTCITY Hamamatsu, Japan), TuA1.4 (September2015).
(2) T. Ueta, Y. Suzuki, H. Satoh, A. Tiwari, N.
Hiromoto, E. Bründermann, H. Inokawa,“Study of THz Antenna-Coupled Bolometer
utilizing SOI MOSFET,” The Second
International Symposium on Frontiers in THz
Technology(FTT2015), (Congress Center in ACT
CITY
Hamamatsu,Japan),Pos1.33st(September 2015).

Further Achievement: Signing of MOU between

Karlsruhe Institute of Technology (KIT),
Germany, and Shizuoka University, Japan, final
signature on November 24th, 2015.

Announcement on KIT website in section onInternational Affairs: “Cooperating with Japan”,
http://www.intl.kit.edu/ischolar/8214.phpPage 3
Travelling Report（Mention each travel by CRP budget.）Name：Dr. Bründermann, Erik
Affiliation ： Karlsruhe Institute of Technology (KIT) Building 345, RoomR217)Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen, Germany217(B345

Period of time：From Aug. 28, 2015 to Sep. 5, 2015
Destination : Shizuoka University, Hamamatsu Campus, RIE
Purpose：Collaboration on research of extreme-performance diagnostics in time-and-space for sources
emitting terahertz transients and discussion on Memorandum of Understanding between Karlsruhe
Institute of Technology and Shizuoka University.
The research objective is to explore new methods for terahertz diagnostics in space(extreme-performance imaging) and for short times (e.g., EO-sampling, streaking techniques,terahertz diagnostics). The department of Accelerator Research at KIT is exploring new ways to detect
single short electron bunches consisting of relativistic electrons by direct diagnostics or indirectly via
the short emitted photon pulses consisting of THz transients in the sub-ps to fs time scale. Thisrequires extreme-performance diagnostics for new generations of electron accelerator-based sources.
FLUTE (Ferninfrarot Linac- Und Test Experiment) is a linear accelerator-based (linac) and test
experiment for accelerator research and technology, currently under construction at KIT, which isplanned to provide short pulses, initially tens of fs within the next year 2016, with the goal to reach
ultimately 1 fs and with very high intensity and electric fields potentially in the GV/m range withemission frequencies, initially, in the terahertz frequency range.
The intention of the collaborative research is to explore and develop new detection and imaging
technologies in the terahertz range at RIE at Shizuoka University, which can be employed at theFLUTE facility at KIT for diagnostics and as proof-of-principle for such radiation sources.
Name of receiver：Norihisa Hiromoto, Shizuoka University