EP2806715A1 - Strahlteiler für FEL-Undulator - Google Patents

Strahlteiler für FEL-Undulator Download PDF

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Publication number
EP2806715A1
EP2806715A1 EP13191927.6A EP13191927A EP2806715A1 EP 2806715 A1 EP2806715 A1 EP 2806715A1 EP 13191927 A EP13191927 A EP 13191927A EP 2806715 A1 EP2806715 A1 EP 2806715A1
Authority
EP
European Patent Office
Prior art keywords
charged particle
particle beam
undulator
kicker
projected direction
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP13191927.6A
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English (en)
French (fr)
Inventor
Hans-Heinrich Braun
Florian Löhl
Sven Reiche
Johannes Friso Van Der Veen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Scherrer Paul Institut
Original Assignee
Scherrer Paul Institut
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Scherrer Paul Institut filed Critical Scherrer Paul Institut
Priority to EP13191927.6A priority Critical patent/EP2806715A1/de
Priority to PCT/EP2014/056580 priority patent/WO2014187603A1/en
Publication of EP2806715A1 publication Critical patent/EP2806715A1/de
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H7/00—Details of devices of the types covered by groups H05H9/00, H05H11/00, H05H13/00
    • H05H7/04—Magnet systems, e.g. undulators, wigglers; Energisation thereof
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H7/00—Details of devices of the types covered by groups H05H9/00, H05H11/00, H05H13/00
    • H05H7/04—Magnet systems, e.g. undulators, wigglers; Energisation thereof
    • H05H2007/041—Magnet systems, e.g. undulators, wigglers; Energisation thereof for beam bunching, e.g. undulators

Definitions

  • the present invention relates to a charged particle beam undulator system for generating synchrotron radiation.
  • Charged particle beams in particular in free-electron lasers (FELs), are a flexible tool for generating ultra-bright, coherent radiation with wavelengths ranging from the microwave to the hard x-ray regime.
  • FELs free-electron lasers
  • high-gain FELs are utilized, in which a bunch train of ultra-relativistic electrons passes through a long undulator for a single time.
  • the undulator a periodic arrangement of magnets, synchrotron light is emitted, which interacts with the electron beam in a way that the emitted light power grows exponentially within the undulator until a saturation state is reached. In this state, approximately 10 -2 to 10 -4 of the kinetic energy of the electron beam is transferred to the photon beam, which is emitted with a narrow spectral bandwidth, a small beam size, and divergence angle.
  • FELs an interesting tool for providing high power beams at short wavelengths.
  • a high-power electron accelerator for example an energy-recovery linear accelerator with the potential of generating a suitable electron beam with tens to hundreds of MW of beam power
  • photon beams with tens of kW of power in the EUV wavelength range are feasible.
  • Such a machine would, for example, be a possible radiation source for next-generation photolithography applications at wavelengths of 13.5 nm, 6 nm, and shorter.
  • a charged particle beam undulator system for generating radiation, preferably synchrotron radiation comprising:
  • the present kicker system enables the transfer of the radiation to various user stations by using only one single undulator.
  • the delivery of the radiation to various user stations achieved by deflecting the charged particle beam from its straight particle trajectory is widely controllable by an appropriate steering of the kicker system. This results in a broad range of possibilities of a positional and/or an angular offset of the charged particle beam leading to a change in the projected direction or in projected position or a combination of change of direction and position.
  • the charged particle beam is part of a free-electron laser (FEL).
  • FEL free-electron laser
  • a free-electron laser for wavelengths in the vacuum ultra-violet and shorter can be realized as a high-gain FEL.
  • the FEL delivers a sufficient yield of synchrotron radiation which enables a transfer of approximately 10 -2 to 10 -4 of the kinetic energy of the electron beam to the photon beam in its saturation state towards the end of the undulator.
  • a further preferred embodiment of the present invention provides for a number of further kicker systems, wherein said number of further kicker systems being disposed between adjacent dipole magnets.
  • the charged particle beam can be newly adjusted.
  • Possible set-up could also provide for a separate kicker system for each pair of dipole magnets.
  • a further kicker system is disposed downstream of the number of dipole magnets.
  • An appropriate controlling of the kicker system can be achieved when said charged particle beam is discontinuously emitted in a number of bunches, wherein said magnet deflecting unit and/or the electric field deflecting unit is/are controlled to deflect the charged particle beam synchronized to said bunches.
  • This synchronization is effected in terms of a fast switch from one projected direction of the charged particle beam to another projected direction of the charged particle beam during the interval between two bunches of the charged particle beam wherein each projected direction is aligned with a spot of interest for the synchrotron radiation. With each new bunch of charged particle beam coming, the projected direction of the charged particle beam changes.
  • a spot of interest can be a user station being equipped to use the synchrotron radiation experimentally or in photolithography applications.
  • FIG. 1 schematically shows an undulator system 2 for an electron beam 4 according to the prior art.
  • the undulator system 2 is called an insertion device in accelerator physics and usually forms part of a larger installation (here not shown), for example a synchrotron storage ring or a free-electron laser facility.
  • the undulator system 2 comprises a periodic structure of dipole magnets 6.
  • the static magnetic field generated by this periodic structure is alternating along the length of the undulator system 2 with a periodicity ⁇ u .
  • the electron beam 4 traversing this periodic magnet structure is forced to deviate from a central straight electron trajectory 8 thereby undergoing regular oscillations and thus radiating photon beams 10.
  • the photon beams 10 produced in the undulator system 2 are very intense and concentrated in narrow energy bands in the spectrum. It is also collimated on the orbit plane of the electron beam.
  • the photon beams are guided through beamlines (here not shown) to experiments in various scientific and productive areas, such as semiconductor lithographic applications.
  • K eB ⁇ ⁇ 2 ⁇ ⁇ m ⁇ ⁇ c
  • e the particle charge
  • B the peak magnetic field
  • ⁇ ⁇ / c
  • m e the electron rest mass
  • c the speed of light
  • the present invention provides an undulator system 12 as schematically shown in Figure 2 that splits the electron beam 4 which is provided as electron bunches within the undulator system 12 of a high-gain FEL, resulting in multiple photon beams 14 to 18. These beams 14 to 18 are directed to different user stations 20 to 24.
  • the top graph of Figure 2 shows a series of segmented dipole magnets 6 with a first set-up of a fast beam kicker 26 upstream of said series of segmented dipole magnets 6 and a second set-up of a fast beam kicker 28 downstream of said series of segmented dipole magnets 6. It is emphasized at this stage that the second set-up of the fast kicker system 28 is not mandatory to reduce the invention to practice.
  • the fast kicker systems 26, 28, which are synchronized with the electron bunches passing by, tilt the straight electron trajectories 8 within the undulator system 12 into the horizontal or vertical directions or in both.
  • the fast kicker systems 26, 28 comprise magnetic and/or electric field deflection devices, such as dipole electromagnets, vacuum capacitors, transverse deflecting cavities or the like.
  • magnetic and/or electric field deflection devices such as dipole electromagnets, vacuum capacitors, transverse deflecting cavities or the like.
  • a bandwidth of several tens of kHz can be achieved using conventional metallic beam pipes.
  • special beam pipes can be utilized, for example ceramic vacuum pipes with a thin metallized coating, that reduce Eddy currents. With such kicker systems, bandwidths of many MHz can be achieved. Even faster response times can be provided by resonant electromagnetic circuits or by transversely deflecting structures or cavities.
  • the FEL radiation emerges coaxially with the electron beam trajectory 8, 30, 32 within the undulator system 12. Hence, the position of the photon beam 16, 18 at some distance from the undulator system 12 is displaced, enabling a different user station 22, 24 to be installed downstream of the undulator system 12.
  • the positional displacement increases linearly with the distance to the undulator system 12.
  • the photon beam 16, 18 can be directed simultaneously to multiple user stations 20 to 24 while using only a single undulator 12.
  • the same beam splitting scheme achieved by the fast kicker system 26 can be applied if focusing systems 34 for the electron beam 4 are installed between segments of longer dipole magnet lines to improve the FEL performance.
  • additional kicker systems 36 near the location of the focusing systems 34 are required, which compensate angular kicks the beam obtains from the focusing elements 34 for various trajectories as shown schematically in the bottom graph of Figure 2 .
  • the second setup of the fast kicker system 28 may be utilized to restore the original trajectory of the electron beam if required.
  • FIG. 3 Examples of split photon beams at some distance from the undulator system 12 are shown in Figure 3 .
  • the left hand panel of Figure 3 shows a pattern of six separated beam spots 38, obtained by synchronously switching the kicker system 26 horizontally and vertically repetitively between the six different states.
  • the right hand panel shows a fan-shaped beam resulting from a continuous, horizontal sweep of the kicker system 36, combined with a synchronous single vertical displacement.
  • Other distributions of beam spots or continuous beam intensity distributions are possible within certain geometrical constraints and within the parameter regime allowed by the FEL process.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Particle Accelerators (AREA)
EP13191927.6A 2013-05-23 2013-11-07 Strahlteiler für FEL-Undulator Withdrawn EP2806715A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP13191927.6A EP2806715A1 (de) 2013-05-23 2013-11-07 Strahlteiler für FEL-Undulator
PCT/EP2014/056580 WO2014187603A1 (en) 2013-05-23 2014-04-02 Beam splitter for fel undulator

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP13168966 2013-05-23
EP13191927.6A EP2806715A1 (de) 2013-05-23 2013-11-07 Strahlteiler für FEL-Undulator

Publications (1)

Publication Number Publication Date
EP2806715A1 true EP2806715A1 (de) 2014-11-26

Family

ID=49553560

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13191927.6A Withdrawn EP2806715A1 (de) 2013-05-23 2013-11-07 Strahlteiler für FEL-Undulator

Country Status (2)

Country Link
EP (1) EP2806715A1 (de)
WO (1) WO2014187603A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106954333A (zh) * 2017-03-28 2017-07-14 中国科学院上海光学精密机械研究所 激光等离子体加速电子束源的多功能聚焦装置和使用方法

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
F.J.DECKER ET AL: "Multiple FELS from the One LCLS Undulator", PROCEEDINGS OF FEL 2011, August 2011 (2011-08-01), pages 629 - 632, XP002727436, ISBN: 978-3-95450-117-5 *
R.BRINKMANN ET AL: "Betatron Switcher for a Multi-color Operation of an X-Ray FEL", PROCEEDINGS OF FEL 2010, April 2011 (2011-04-01), pages 127 - 130, XP002727434 *
R.BRINKMANN ET AL: "Possible Operation of the European XFEL with Ultra-low Emittance Beams", NUCLEAR INSTRUMENTS AND METHODS IN PHYSICS RESEARCH A, vol. 616, 26 February 2010 (2010-02-26), pages 81 - 87, XP002727435 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106954333A (zh) * 2017-03-28 2017-07-14 中国科学院上海光学精密机械研究所 激光等离子体加速电子束源的多功能聚焦装置和使用方法
CN106954333B (zh) * 2017-03-28 2018-11-20 中国科学院上海光学精密机械研究所 激光等离子体加速电子束源的多功能聚焦装置和使用方法

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