Controlling beam trajectory and transport in a tapered helical undulator
In this paper we present a detailed discussion of the helical undulator system developed for high extraction efficiency experiments in the tapered-enhanced stimulated superradiant amplification regime. The design is based on permanent magnet technology and comprises two Halbach arrays orthogonally o...
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International Union of Crystallography
2025-03-01
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| Series: | Journal of Synchrotron Radiation |
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| Online Access: | https://journals.iucr.org/paper?S1600577524012463 |
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| author | A. Fisher J. Jin P. Musumeci |
| author_facet | A. Fisher J. Jin P. Musumeci |
| author_sort | A. Fisher |
| collection | DOAJ |
| description | In this paper we present a detailed discussion of the helical undulator system developed for high extraction efficiency experiments in the tapered-enhanced stimulated superradiant amplification regime. The design is based on permanent magnet technology and comprises two Halbach arrays orthogonally oriented and shifted by 90° with respect to each other. When used in low energy beamlines for THz generation, the electron beam trajectory and transport are particularly sensitive to the undulator off-axis fields so that it becomes important to complement on-axis field measurements with analysis and tuning of the higher-order field components. Here we describe how the pulsed wire measurement technique can be effectively used to retrieve on- and off-axis magnetic field characteristics of the undulator. A simple two-dipole model is developed to guide the final adjustments to the permanent magnet positions along the array to tune the quadrupole and sextupole components of the field. |
| format | Article |
| id | doaj-art-b9ffbe0f9260463ca57c2cae597e1d23 |
| institution | DOAJ |
| issn | 1600-5775 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | International Union of Crystallography |
| record_format | Article |
| series | Journal of Synchrotron Radiation |
| spelling | doaj-art-b9ffbe0f9260463ca57c2cae597e1d232025-08-20T02:58:36ZengInternational Union of CrystallographyJournal of Synchrotron Radiation1600-57752025-03-0132233133910.1107/S1600577524012463zhu5004Controlling beam trajectory and transport in a tapered helical undulatorA. Fisher0J. Jin1P. Musumeci2Department of Physics and Astronomy, University of California Los Angeles, 475 Portola Plaza, Los Angeles, CA 90095, USADepartment of Physics and Astronomy, University of California Los Angeles, 475 Portola Plaza, Los Angeles, CA 90095, USADepartment of Physics and Astronomy, University of California Los Angeles, 475 Portola Plaza, Los Angeles, CA 90095, USAIn this paper we present a detailed discussion of the helical undulator system developed for high extraction efficiency experiments in the tapered-enhanced stimulated superradiant amplification regime. The design is based on permanent magnet technology and comprises two Halbach arrays orthogonally oriented and shifted by 90° with respect to each other. When used in low energy beamlines for THz generation, the electron beam trajectory and transport are particularly sensitive to the undulator off-axis fields so that it becomes important to complement on-axis field measurements with analysis and tuning of the higher-order field components. Here we describe how the pulsed wire measurement technique can be effectively used to retrieve on- and off-axis magnetic field characteristics of the undulator. A simple two-dipole model is developed to guide the final adjustments to the permanent magnet positions along the array to tune the quadrupole and sextupole components of the field.https://journals.iucr.org/paper?S1600577524012463free-electron laserspulsed wiremagnetic measurementsundulator tuning |
| spellingShingle | A. Fisher J. Jin P. Musumeci Controlling beam trajectory and transport in a tapered helical undulator Journal of Synchrotron Radiation free-electron lasers pulsed wire magnetic measurements undulator tuning |
| title | Controlling beam trajectory and transport in a tapered helical undulator |
| title_full | Controlling beam trajectory and transport in a tapered helical undulator |
| title_fullStr | Controlling beam trajectory and transport in a tapered helical undulator |
| title_full_unstemmed | Controlling beam trajectory and transport in a tapered helical undulator |
| title_short | Controlling beam trajectory and transport in a tapered helical undulator |
| title_sort | controlling beam trajectory and transport in a tapered helical undulator |
| topic | free-electron lasers pulsed wire magnetic measurements undulator tuning |
| url | https://journals.iucr.org/paper?S1600577524012463 |
| work_keys_str_mv | AT afisher controllingbeamtrajectoryandtransportinataperedhelicalundulator AT jjin controllingbeamtrajectoryandtransportinataperedhelicalundulator AT pmusumeci controllingbeamtrajectoryandtransportinataperedhelicalundulator |