公开(公告)号：US09502166B2

公开(公告)日：2016-11-22

申请号：US14423230

申请日：2012-12-26

Applicant: KOREA ATOMIC ENERGY RESEARCH INSTITUTE

Inventor： Young Uk Jeong ,  Ki Tae Lee ,  Seong Hee Park ,  Shang In Shin ,  Kyuha Jang ,  Jeong Ho Moon ,  Nikolay Vinokurov

IPC: H01F7/02 ,  H05H7/04 ,  H01F1/053

CPC classification number: H01F7/0221 ,  H01F1/053 ,  H05H7/04

Abstract: A variable-period permanent-magnet undulator which is applicable not only to a planar undulator but also to a helical undulator, in which permanent-magnets and ferromagnetic substances are alternately arranged, and the ferromagnetic substance interposed between the permanent-magnets is saturated to thus enable the magnets to be effectively spaced apart from each other by the repulsive force between the permanent-magnets, thereby adjusting the period of the magnetic field in an easy and precise manner.

Abstract translation: 一种可变周期永磁体波动器，其不仅适用于平面波动器，而且可应用于螺旋形波动器，其中永磁体和铁磁物质交替布置，并且介于永磁体之间的铁磁物质饱和 能够通过永久磁铁之间的排斥力使磁体彼此有效地间隔开，从而容易且精确地调整磁场的周期。

公开(公告)号：US11728125B2

公开(公告)日：2023-08-15

申请号：US17126904

申请日：2020-12-18

Applicant: KOREA ATOMIC ENERGY RESEARCH INSTITUTE

Inventor： Young Uk Jeong ,  Nikolay Vinokurov ,  Hyun Woo Kim ,  Ki Tae Lee ,  Kyuha Jang ,  Inhyung Baek

IPC: H01J37/14 ,  H01J37/073

CPC classification number: H01J37/14 ,  H01J37/073

Abstract: There is provided an ultrafast electron diffraction apparatus including: a photoelectron gun configured to emit an electron beam; a bending portion for emitting the electron beam emitted from the photoelectron gun by changing a travel direction of the electron beam by a predetermined angle; and a sample portion including a sample to be analyzed by the electron beam emitted from the bending portion. The electron beam reaches the sample portion in a state that a pulse of the electron beam is compressed and the timing jitter between the pumping light and probe electron pulse is completely reduced as the travel direction of the electron beam is changed by the predetermined angle through the bending portion.

公开(公告)号：US10511133B2

公开(公告)日：2019-12-17

申请号：US15750668

申请日：2016-08-11

Applicant: Korea Atomic Energy Research Institute

Inventor： Young Uk Jeong ,  Boris Gudkov ,  Nikolay Vinokurov ,  Ki Tae Lee ,  Seong Hee Park ,  Kyuha Jang ,  Jeong Sang Jo

IPC: H01S1/00 ,  H01J63/02 ,  G01N21/3581

Abstract: Provided is a linearly polarized ultra-short terahertz wave generating device which has a parabolic barrel mirror installed at one side of a multiple thin film, to generate an ultra-short terahertz wave having single linear-polarized light and uniformly formed output distribution.

公开(公告)号：US11152926B2

公开(公告)日：2021-10-19

申请号：US16543907

申请日：2019-08-19

Applicant: KOREA ATOMIC ENERGY RESEARCH INSTITUTE

Inventor： Young Uk Jeong ,  Gudkov Boris ,  Ki Tae Lee ,  Sangyoon Bae ,  Tae Sik Yoon

IPC: H03K17/60 ,  H03K3/57

Abstract: A modulator includes: a high voltage transformer transforming a voltage supplied through a primary side and a secondary side to apply a current pulse to a driving device; a bipolar pulse generator applying a magnetizing pulse and a main pulse to a connection line connected to the primary side of the high voltage transformer; and a timing controller controlling a time difference of applying the magnetizing pulse and the main pulse, wherein the bipolar pulse generator includes a magnetizing pulse generation unit generating the magnetizing pulse by using positive power, and a main pulse generation unit generating a negative pulse by using negative power. Also, the modulator includes a pulse waveform controller in which a plurality of unit modules of the same structure is disposed in series through a small transformer on the secondary side of the high voltage transformer. These two configurations may independently control the magnitude and the waveform of the current pulse of the high voltage, respectively and realize simultaneously two functions.

公开(公告)号：US20150255201A1

公开(公告)日：2015-09-10

申请号：US14423230

申请日：2012-12-26

Applicant: KOREA ATOMIC ENERGY RESEARCH INSTITUTE

Inventor： Young Uk Jeong ,  Ki Tae Lee ,  Seong Hee Park ,  Shang In Shin ,  Kyuha Jang ,  Jeong Ho Moon ,  Nikolay Vinokurov

IPC: H01F7/02 ,  H01F1/053

CPC classification number: H01F7/0221 ,  H01F1/053 ,  H05H7/04

Abstract: A variable-period permanent-magnet undulator which is applicable not only to a planar undulator but also to a helical undulator, in which permanent-magnets and ferromagnetic substances are alternately arranged, and the ferromagnetic substance interposed between the permanent-magnets is saturated to thus enable the magnets to be effectively spaced apart from each other by the repulsive force between the permanent-magnets, thereby adjusting the period of the magnetic field in an easy and precise manner.

Abstract translation: 一种可变周期永磁体波动器，其不仅适用于平面波动器，而且可应用于螺旋形波动器，其中永磁体和铁磁物质交替布置，并且介于永磁体之间的铁磁物质饱和 能够通过永久磁铁之间的排斥力使磁体彼此有效地间隔开，从而容易且精确地调整磁场的周期。