NDLI: A High-efficiency 33 GHz Free Electron Laser With A Reversed Axial Magnetic Field

Content Provider	IEEE Xplore Digital Library
Author	Conde, M.E. Bekefi, G.
Copyright Year	1992
Description	Author affiliation: Massachusetts Institute of Technology (Conde, M.E.)
Abstract	We report on a new regime of five electron laser operation using a helical wiggler and a reversed axial guide magnetic field. The orientation of the axial field is such that the helical wiggler and the cyclotron motion of the electrons in the guide field have opposite handedness. The mildly relativistic electron beam (750 keV) is generated by a Marx capacitor bank (Physics Intemational Pulserad 110A). The field-emission cathode yields 300 A, with a beam radius of 2.54 mm. The bifilar helical wiggler has a period of 3.18 cm and provides a magnetic field of 1.5 kG on axis. The FEL is driven by a n-mgnetron operating at 33.39 GHz. About 20 kW of linearly polarized radiation is injected into the TE/sub 11/ mode of the circular drift tube. The output power of the device is transmitted by a conical hom into a microwave anechoic chamber and then received by a small horn. By moving the receiving horn we determine the angular pattern of the emitted radiation. We have measured over 60 MW of output power, corresponding to an efficiency of 27%. The results are compared with those obtained when the axial guide field is in its conventional orientation, where considerable loss of power and efficiency is observed. The frequency spectrum has been determined by mixing the emitted power with radiation from a K-band local oscillator and then by feeding the beat wave into an X-band filter bank. In the conventional geometry (unlike in the Reversed Field configuration), an unexpected frequency upshift from the magnetron input frequency of the order of 100 MHz has been observed, and will be discussed.
Starting Page	161
Ending Page	161
File Size	94544
Page Count	1
File Format	PDF
ISBN	078030716X
DOI	10.1109/PLASMA.1992.697959
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1992-06-01
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Free electron lasers Magnetic fields Plasma confinement Magnetic resonance Laser theory Physics Undulators Cyclotrons Frequency Heating
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

A 33 GHz Free Electron Laser With Reversed Axial Guide Magnetic Field

Techniques For Confinement Enhancement In Spherical Pinch

Amplification and superradiant emission from a 33.3 GHz free electron laser with a reversed axial guide magnetic field

Relativistic cyclotron resonance masers with inhomogeneous external magnetic fields

The Rippled-Field Magnetron (Cross-Field Free Electron Laser)

Electron orbits in a free-electron laser with planar wiggler, axial magnetic field, and ion-channel guiding

Operation of a 32 GHz pulsed gyrotron

Theoretical and experimental comparison of FEL-oscillators with conventional and reversed guide field

Free electron laser for electron cyclotron heating in plasma fusion: Is there a renewed interest?

A High-efficiency 33 GHz Free Electron Laser With A Reversed Axial Magnetic Field

Similar Documents

A 33 GHz Free Electron Laser With Reversed Axial Guide Magnetic Field

Techniques For Confinement Enhancement In Spherical Pinch

Amplification and superradiant emission from a 33.3 GHz free electron laser with a reversed axial guide magnetic field

Relativistic cyclotron resonance masers with inhomogeneous external magnetic fields

The Rippled-Field Magnetron (Cross-Field Free Electron Laser)

Electron orbits in a free-electron laser with planar wiggler, axial magnetic field, and ion-channel guiding

Operation of a 32 GHz pulsed gyrotron

Theoretical and experimental comparison of FEL-oscillators with conventional and reversed guide field

Free electron laser for electron cyclotron heating in plasma fusion: Is there a renewed interest?

A High-efficiency 33 GHz Free Electron Laser With A Reversed Axial Magnetic Field