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    Ultra-short terahertz pulse generator having multiple foils
    1.
    发明授权
    Ultra-short terahertz pulse generator having multiple foils 有权
    具有多个箔片的超短太赫兹脉冲发生器

    公开(公告)号：US09337603B2

    公开(公告)日：2016-05-10

    申请号：US14416043

    申请日：2013-05-14

    Applicant: KOREA ATOMIC ENERGY RESEARCH INSTITUTE

    Inventor： Nikolay Vinokurov ,  Young Uk Jeong

    IPC: H01S1/00 ,  H01J25/00 ,  H01S3/10 ,  G02B6/04 ,  H01J63/02 ,  G01N21/3581

    CPC classification number: H01S1/005 ,  G01N21/3581 ,  H01J25/00 ,  H01J63/02

    Abstract: This specification relates to a terahertz pulse generator capable of generating ultra-short terahertz pulses by use of electron beams transported through a plurality of foils. The plurality of foils in a shape of disc are arranged in an overlapped state and form a conical shape that diameters of the disc-shaped foils sequentially decrease along a direction that the electron beam is transported. Coherent radiation, which is generated as the ultra-short electron beam is transported through the foils in respective spaced gaps of the foils, is propagated toward the outside of the disc-shaped foils and gathered with forming a conical wave surface at edges of the disc-shaped foils. This may result in enhancement of generation efficiency of the terahertz waves.

    Abstract translation: 本说明书涉及能够通过使用通过多个​​箔片传送的电子束产生超短太赫兹脉冲的太赫兹脉冲发生器。 圆盘状的多个箔以重叠的状态配置，形成圆盘状，圆板状的直径沿电子束的输送方向依次减少。 随着超短电子束被传送通过箔的各个隔开的间隙中的箔而产生的相干辐射朝着盘形箔的外部传播并且聚集成在圆盘的边缘处形成锥形波面 形箔。 这可能导致提高太赫兹波的发电效率。

    ULTRA-SHORT TERAHERTZ PULSE GENERATOR HAVING MULTIPLE FOILS
    3.
    发明申请
    ULTRA-SHORT TERAHERTZ PULSE GENERATOR HAVING MULTIPLE FOILS 有权
    具有多根螺丝的超短波特雷赫特脉冲发生器

    公开(公告)号：US20150244135A1

    公开(公告)日：2015-08-27

    申请号：US14416043

    申请日：2013-05-14

    Applicant: KOREA ATOMIC ENERGY RESEARCH INSTITUTE

    Inventor： Nikolay Vinokurov ,  Young Uk Jeong

    IPC: H01S1/00 ,  H01J63/02

    CPC classification number: H01S1/005 ,  G01N21/3581 ,  H01J25/00 ,  H01J63/02

    Abstract: This specification relates to a terahertz pulse generator capable of generating ultra-short terahertz pulses by use of electron beams transported through a plurality of foils. The plurality of foils in a shape of disc are arranged in an overlapped state and form a conical shape that diameters of the disc-shaped foils sequentially decrease along a direction that the electron beam is transported. Coherent radiation, which is generated as the ultra-short electron beam is transported through the foils in respective spaced gaps of the foils, is propagated toward the outside of the disc-shaped foils and gathered with forming a conical wave surface at edges of the disc-shaped foils. This may result in enhancement of generation efficiency of the terahertz waves.

    Abstract translation: 本说明书涉及能够通过使用通过多个​​箔片传送的电子束产生超短太赫兹脉冲的太赫兹脉冲发生器。 圆盘状的多个箔以重叠的状态配置，形成圆盘状，圆板状的直径沿电子束的输送方向依次减少。 随着超短电子束被传送通过箔的各个隔开的间隙中的箔而产生的相干辐射朝着盘形箔的外部传播并且聚集成在圆盘的边缘处形成锥形波面 形箔。 这可能导致提高太赫兹波的发电效率。

    Modulator for controlling current pulse and method thereof
    4.
    发明授权
    Modulator for controlling current pulse and method thereof 有权

    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.

    VARIABLE-CYCLE PERMANENT-MAGNET UNDULATOR
    5.
    发明申请
    VARIABLE-CYCLE PERMANENT-MAGNET UNDULATOR 有权
    可变周期永久磁铁解决方案

    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。

    Ultrafast electron diffraction apparatus
    6.
    发明授权
    Ultrafast electron diffraction apparatus 有权

    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.

    Variable-cycle permanent-magnet undulator
    8.
    发明授权
    Variable-cycle permanent-magnet undulator 有权
    可变循环永磁体波动器

    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。

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