BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN BEGIN:VEVENT SUMMARY:Carrier dynamics in doped Ge measured at the free electron laser f acility FELBE DTSTART;VALUE=DATE-TIME:20160706T080000Z DTEND;VALUE=DATE-TIME:20160706T082000Z DTSTAMP;VALUE=DATE-TIME:20260520T050645Z UID:indico-contribution-133-1159@indico.inp.nsk.su DESCRIPTION:Speakers: Nils Dessmann (Humboldt-University Berlin)\nCooled g ermanium (Ge) photoconductive detectors are one of the most sensitive dete ctors at terahertz (THz) frequencies. They are widely used in laboratory s pectroscopy and imaging experiments. The speed of a Ge photoconductive det ector is set by technical limitations such as the bias circuit\, the geome try of the detector crystal and the electric field applied to the .detecto r. The recovery speed of the detector material is\, however\, fundamentall y limited only by the lifetimes of the intraband relaxation of the free ch arge carriers within the valence or conduction band and by band-to-impurit y relaxation (capture) down to the impurity ground state. Therefore\, capt ure and intraband relaxation processes have been measured for different do pants in uncompensated and compensated n- and p-type Ge by a pump-probe te chnique at the free electron laser facility FELBE.\n\nhttps://indico.inp.n sk.su/event/3/contributions/1159/ LOCATION:Budker INP Parallel session Hall URL:https://indico.inp.nsk.su/event/3/contributions/1159/ END:VEVENT BEGIN:VEVENT SUMMARY:Formation of nanosized metal hydrosols under the influence of tera hertz laser radiation DTSTART;VALUE=DATE-TIME:20160706T102000Z DTEND;VALUE=DATE-TIME:20160706T104000Z DTSTAMP;VALUE=DATE-TIME:20260520T050645Z UID:indico-contribution-133-1165@indico.inp.nsk.su DESCRIPTION:Speakers: Alexander Kozlov (Voevodsky Institute of chemical ki netics and combustion SB RAS)\nThe present report describes a new phenomen on - short-term exposure of water with focused terahertz radiation of free electron laser leads to the formation of nanoparticle suspension (hydroso l). Composition of the particles formed corresponds to the material of met al containers used in the experiment. Fractional and elemental composition of the particles was determined by atomic force (AFM)\, scanning electron microscopy with elemental analyzer (SEM EDAX)\, and the results of mass s pectrometry with inductively coupled plasma (ICP-MS). Hydrosols are techno logically convenient form\, suitable for scientific and technological appl ications which require uniform deposition and high catalytic activity\, th ey are useful in medicine\, nonlinear optics\, as well as the alternate me thod of sample preparation for chemical and elemental analysis.\n\nhttps:/ /indico.inp.nsk.su/event/3/contributions/1165/ LOCATION:Budker INP Parallel session Hall URL:https://indico.inp.nsk.su/event/3/contributions/1165/ END:VEVENT BEGIN:VEVENT SUMMARY:High temperature quasi stationary terahertz optical discharge on N ovoFEL DTSTART;VALUE=DATE-TIME:20160706T082000Z DTEND;VALUE=DATE-TIME:20160706T084000Z DTSTAMP;VALUE=DATE-TIME:20260520T050645Z UID:indico-contribution-133-1166@indico.inp.nsk.su DESCRIPTION:Speakers: Vitaly Kubarev (BINP)\nThreshold conditions\, plasma parameters\, autooscillations and their stabilization in terahertz optica l discharge on NovoFEL are considered in the report\n\nhttps://indico.inp. nsk.su/event/3/contributions/1166/ LOCATION:Budker INP Parallel session Hall URL:https://indico.inp.nsk.su/event/3/contributions/1166/ END:VEVENT BEGIN:VEVENT SUMMARY:Single-pulse high-resolution spectroscopy on NovoFEL: methods\, ap plications and development DTSTART;VALUE=DATE-TIME:20160706T053000Z DTEND;VALUE=DATE-TIME:20160706T060000Z DTSTAMP;VALUE=DATE-TIME:20260520T050645Z UID:indico-contribution-133-1167@indico.inp.nsk.su DESCRIPTION:Speakers: Vitaly Kubarev (BINP)\nMethods of single-pulse high- resolution spectroscopy based on powerful tunable radiation of terahertz N ovoFEL\, ultra-fast technique\, and strong magnetic field of superconducti ng solenoid are presented in the report\n\nhttps://indico.inp.nsk.su/event /3/contributions/1167/ LOCATION:Budker INP Parallel session Hall URL:https://indico.inp.nsk.su/event/3/contributions/1167/ END:VEVENT BEGIN:VEVENT SUMMARY:Intensity and timing jitter compensated ultra-fast experiments at accelerator-driven photonsources DTSTART;VALUE=DATE-TIME:20160706T094000Z DTEND;VALUE=DATE-TIME:20160706T100000Z DTSTAMP;VALUE=DATE-TIME:20260520T050645Z UID:indico-contribution-133-1171@indico.inp.nsk.su DESCRIPTION:Speakers: Sergey Kovalev (HZDR)\nTiming jitter and power insta bilities are crucial parameters which greatly reduce the applicability of accelerator driven light sources for time-resolved experiments. In this c ontribution we present a technique that allows achieving few 10 fs time-re solution in experiments operating at cw repetition rates of up to 100 kHz at presents of timing jitter in order of ps. As we show on the example of a benchmark experiment based on THz driven magnetization dynamics\, our me thod provides a sensitivity or dynamic range that is comparable to all-las er based techniques. Moreover we show how the time and power instabilities in combination with a high repetition rate can be turned from a problem i nto a favor an advantage and can be \nutilized as an ultrafast delay line and attenuator. Our method employs a fs-level arrival time monitor based on electro-optic sampling of residual pulses from a coherent diffraction r adiatior and a fast THz detector allowing for pulse to pulse detection of arrival time and pump pulse intensity. The monitor can operate at high rep etition rates (presently up to a few 100 kHz) and low electron bunch charg es (sub pC). The prototype device has been tested at the quasi CW linear R F electron accelerator (ELBE). Despite timing jitter of 1.5 ps (FWHM) and 15% intensity fluctuations of the pump pulse intensity\, a temporal resolu tion of around 20 fs (peak-to-peak) and a dynamic range of 100 dB was achi eved. Our method has high potential to provide few fs level synchronizatio n on next generation large scale X-ray photon sources based on high repeti tion rate electron accelerators such as LCLSII. A demonstrator aiming at o peration up to 4.7 MHz is under development for the European X-FEL within the frame of a recently granted EU project within the HORIZON2020 program. \n\nhttps://indico.inp.nsk.su/event/3/contributions/1171/ LOCATION:Budker INP Parallel session Hall URL:https://indico.inp.nsk.su/event/3/contributions/1171/ END:VEVENT BEGIN:VEVENT SUMMARY:Pump-probe setup for far-infrared subnanosecond time-resolved spec troscopy at the Novosibirsk free electron laser DTSTART;VALUE=DATE-TIME:20160706T070000Z DTEND;VALUE=DATE-TIME:20160706T072000Z DTSTAMP;VALUE=DATE-TIME:20260520T050645Z UID:indico-contribution-133-1179@indico.inp.nsk.su DESCRIPTION:Speakers: Yulia Choporova (Budker Institute of Nuclear Physics )\nA one-color pump-probe system has been commissioned at the Novosibirsk free electron laser facility. Results of current experiments on the study of dynamical absorption of semiconductors will be described.\n\nhttps://in dico.inp.nsk.su/event/3/contributions/1179/ LOCATION:Budker INP Parallel session Hall URL:https://indico.inp.nsk.su/event/3/contributions/1179/ END:VEVENT BEGIN:VEVENT SUMMARY:Synchrotron radiation X-ray tomographic microscopy\, noble gas mas s spectroscopy\, infrared and Raman microscopy correlated study of the Ito kawa asteroid particles returned by the Hayabusa space probe DTSTART;VALUE=DATE-TIME:20160706T050000Z DTEND;VALUE=DATE-TIME:20160706T053000Z DTSTAMP;VALUE=DATE-TIME:20260520T050645Z UID:indico-contribution-133-1277@indico.inp.nsk.su DESCRIPTION:Speakers: Sergey Pavlov (German Aerospace Center)\nThe analysi s of ateroid’s surface grains allows to match remote observations and mo deling of its history and current properties with laboratory experiments. Mass spectrometry and electron microscopy of the dust enables detailed stu dy of the history of asteroidal regolith and compare the results with theo retical considerations of the evolution of rubble piles in the inner solar system. A correlated study including consequential Raman and infrared mic rospectroscopy\, synchrotron radiation X-ray tomographic microscopy (SRXTM ) and noble gas mass spectroscopy has been implemented for the determinati on of cosmic-ray exposure ages and trapped Xe content in a few particles r eturned by the JAXA’s Hayabusa space probe from the near-Earth asteroid 25143 Itokawa\, the first successful sample return mission to an asteroid. New data support the uniformly short exposure to cosmic rays of the Itoka wa regolith of \n\nhttps://indico.inp.nsk.su/event/3/contributions/1277/ LOCATION:Budker INP Parallel session Hall URL:https://indico.inp.nsk.su/event/3/contributions/1277/ END:VEVENT BEGIN:VEVENT SUMMARY:Terahertz surface plasmons on real metal-dielectric structures: co mparison of theory and experiments DTSTART;VALUE=DATE-TIME:20160706T072000Z DTEND;VALUE=DATE-TIME:20160706T074000Z DTSTAMP;VALUE=DATE-TIME:20260520T050645Z UID:indico-contribution-133-1276@indico.inp.nsk.su DESCRIPTION:Speakers: Vasily Gerasimov (Budker Institute of Nuclear Physic s SB RAS)\nTerahertz surface plasmons propagated along real metal-dielectr ic structures\, as well as their propagation through the macroscopic air g apes between two conducting surfaces\, have been studied. The experimental results obtained using terahertz radiation of Novosibirsk free-electron l aser and comparison with theory will be presented\n\nhttps://indico.inp.ns k.su/event/3/contributions/1276/ LOCATION:Budker INP Parallel session Hall URL:https://indico.inp.nsk.su/event/3/contributions/1276/ END:VEVENT BEGIN:VEVENT SUMMARY:Raman scattering at terahertz frequencies enabled by an infrared f ree electron laser DTSTART;VALUE=DATE-TIME:20160706T074000Z DTEND;VALUE=DATE-TIME:20160706T080000Z DTSTAMP;VALUE=DATE-TIME:20260520T050645Z UID:indico-contribution-133-1280@indico.inp.nsk.su DESCRIPTION:Speakers: Sergey Pavlov (German Aerospace Center)\nIn the last decade the use of infrared free electron laser facilities enabled observa tion of inelastic light (Raman) scattering in THz frequency range. Raman-a ctive intracenter donor transitions in silicon fall into the THz range and serve as outgoing resonances in electronic Stokes scattering. At photon f luxes above 1E24 photon/cm2/s donor-related Raman stimulated emission occu rs in the range 4.2-6.5 THz from natural and isotopically enriched silicon crystals with various dopants while the free electron laser wavelength wa s varied between 18 and 41 µm (7.5-16.5 THz). Study of dynamics of the ob served emission shows a transient picosecond-micropulse mode that indicate s on significantly larger Raman gain realized in THz Raman silicon lasers. \nThis research has been partly supported by the EC CALIPSO project for th e Transnational access to the European FELs and Synchrotron facilities as well as joint German-Russian program “Research on technological advances of radiation sources of photons and neutrons based on accelerators and ne utron sources in cooperation with research organizations and universities of the Federal Republic of Germany” (InTerFEL project\, BMBF No. 05K2014 and the Russian Ministry of Science and Education (No. RFMEFl61614X0008). \n\nhttps://indico.inp.nsk.su/event/3/contributions/1280/ LOCATION:Budker INP Parallel session Hall URL:https://indico.inp.nsk.su/event/3/contributions/1280/ END:VEVENT BEGIN:VEVENT SUMMARY:FEL-based study of intervalley elastic scattering of donor excited states in multivalley semiconductors DTSTART;VALUE=DATE-TIME:20160706T042000Z DTEND;VALUE=DATE-TIME:20160706T050000Z DTSTAMP;VALUE=DATE-TIME:20260520T050645Z UID:indico-contribution-133-1286@indico.inp.nsk.su DESCRIPTION:Speakers: Valery Shastin (IPM RAS)\nFEL-based optical pump-pro be technique is usually applied for study of highly non-equilibrium electr ons in semiconductors and in particularly for the relaxation of donor or a cceptor bound excited states. Here we are focused on intervalley elastic s cattering that is typical for donors in silicon crystal. As shown such pro cess results in an additional feature in a pump-probe response that has be en ignored so far in the interpretation of data obtained using FELIX and FELBE free electron lasers. On the other hand the knowledge on the elastic intervalley scattering is also important from physical point of view.\n\n https://indico.inp.nsk.su/event/3/contributions/1286/ LOCATION:Budker INP Parallel session Hall URL:https://indico.inp.nsk.su/event/3/contributions/1286/ END:VEVENT BEGIN:VEVENT SUMMARY:Duration of coherent synchrotron radiation pulses accessed via tim e-resolving and correlation techniques DTSTART;VALUE=DATE-TIME:20160706T100000Z DTEND;VALUE=DATE-TIME:20160706T102000Z DTSTAMP;VALUE=DATE-TIME:20260520T050645Z UID:indico-contribution-133-1310@indico.inp.nsk.su DESCRIPTION:Speakers: Andreas Pohl (Humboldt-University Berlin)\nCoherent synchrotron radiation (CSR) is emitted from bunches of relativistic electr ons in a storage ring. The CSR spectrum depends on the shape of the electr on bunch from which the CSR radiation is emitted. Instantaneous monitoring of the form and duration of the field transients in CSR pulses is importa nt for applications in pump-probe studies of carrier dynamics in semicondu ctors and superconductors\,where the required excitation must be simultane ously unipolar and much shorter than the expected relaxation time.\nHere w e use two types of ultra-fast detectors\, Schottky diodes and superconduct ing microbridges\, to evaluate the duration of transient field-oscillation s in CSR pulses under stable average intensity of the CSR source by means of time-resolving and field-correlation techniques. We show that both meth ods deliver close results.\n\nhttps://indico.inp.nsk.su/event/3/contributi ons/1310/ LOCATION:Budker INP Parallel session Hall URL:https://indico.inp.nsk.su/event/3/contributions/1310/ END:VEVENT BEGIN:VEVENT SUMMARY:Ultrafast Pump-probe Facility based on an RF Photogun DTSTART;VALUE=DATE-TIME:20160706T090000Z DTEND;VALUE=DATE-TIME:20160706T094000Z DTSTAMP;VALUE=DATE-TIME:20260520T050645Z UID:indico-contribution-133-1314@indico.inp.nsk.su DESCRIPTION:Speakers: Young Uk Jeong (Korea Atomic Energy Research Institu te)\nSmall-scale accelerator-based radiation sources have been used for de veloping advanced technologies and exploring new science with high conveni ence and low cost. Sometimes they are competitive comparing with giant fac ilities like X-ray free-electron lasers (X-FELs). We have developed a labo ratory-scale ultrashort electron accelerator for investigating femtosecond dynamics of atoms or molecules with pump-probe experiments. This system h as four beamlines. Two of them are for ultrafast electron diffraction (UED ) experiments on solid and gas samples. The electron bunch duration at the UED beamlines are designed to be ~30 fs in rms. Our target value of the t iming jitter between pumping laser pulse and probing electron bunch is 10 fs. The UED beamlines can perform single-shot measurement with a temporal accuracy less than 50 fs. As a pumping source\, we have developed a high-i ntense terahertz pulse generator with the field strength of more than 0.5 MV/cm by using a femtosecond laser and a non-linear crystal. This small-sc ale facility can be used for investigating time-resolved diffraction exper iments with samples of gas\, liquid\, solid\, and surface. The application experiments of the UED beamlines will be performed by the collaboration w ith universities in Korea.\n\nhttps://indico.inp.nsk.su/event/3/contributi ons/1314/ LOCATION:Budker INP Parallel session Hall URL:https://indico.inp.nsk.su/event/3/contributions/1314/ END:VEVENT END:VCALENDAR