Free electron maser amplifier experiments

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Abstract

We present results from the X-band reversed guide magnetic field Raman Free Electron Maser (FEM) amplifier experiment at Strathclyde University. The FEM has been designed for zero slippage to achieve maximum instantaneous bandwidth. The tuneablity is further extended by the adjustment of beam voltage and undulator field strength. A 1 kW TWT has been used as the input source for broadband measurements and two 25 kW magnetrons for saturated output power measurements at discrete frequencies. Results show an instantaneous −3 dB bandwidth of 30% for a fixed cathode voltage and magnetic field. The device can be tuned over a range of 65% of the centre frequency by adjusting the cathode voltage. A saturated power of over 1 MW has been measured for 50 A input current. Broadband unsaturated gains of over 35 dB have been measured. An experiment using a 50 A beam from a thermionic cathode electron gun designed at Strathclyde is currently in progress. This will theoretically allow CW operation of the FEM using a DC undulator magnet and DC power source.
Original languageEnglish
Pages (from-to)272-275
Number of pages3
JournalNuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume445
Issue number1-3
DOIs
Publication statusPublished - 1 May 2000

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Masers
masers
free electrons
Wigglers
amplifiers
Electrons
Electric potential
electric potential
Cathodes
Thermionic cathodes
cathodes
direct current
adjusting
Magnetrons
thermionic cathodes
Magnetic fields
magnetrons
broadband
bandwidth
Bandwidth

Keywords

  • free electron maser amplifier
  • experiments

Cite this

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title = "Free electron maser amplifier experiments",
abstract = "We present results from the X-band reversed guide magnetic field Raman Free Electron Maser (FEM) amplifier experiment at Strathclyde University. The FEM has been designed for zero slippage to achieve maximum instantaneous bandwidth. The tuneablity is further extended by the adjustment of beam voltage and undulator field strength. A 1 kW TWT has been used as the input source for broadband measurements and two 25 kW magnetrons for saturated output power measurements at discrete frequencies. Results show an instantaneous −3 dB bandwidth of 30{\%} for a fixed cathode voltage and magnetic field. The device can be tuned over a range of 65{\%} of the centre frequency by adjusting the cathode voltage. A saturated power of over 1 MW has been measured for 50 A input current. Broadband unsaturated gains of over 35 dB have been measured. An experiment using a 50 A beam from a thermionic cathode electron gun designed at Strathclyde is currently in progress. This will theoretically allow CW operation of the FEM using a DC undulator magnet and DC power source.",
keywords = "free electron maser amplifier, experiments",
author = "C.G. Whyte and D.A. Jaroszynski and A.W. Cross and W. He and K. Ronald and A. Young and A.D.R. Phelps",
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TY - JOUR

T1 - Free electron maser amplifier experiments

AU - Whyte, C.G.

AU - Jaroszynski, D.A.

AU - Cross, A.W.

AU - He, W.

AU - Ronald, K.

AU - Young, A.

AU - Phelps, A.D.R.

PY - 2000/5/1

Y1 - 2000/5/1

N2 - We present results from the X-band reversed guide magnetic field Raman Free Electron Maser (FEM) amplifier experiment at Strathclyde University. The FEM has been designed for zero slippage to achieve maximum instantaneous bandwidth. The tuneablity is further extended by the adjustment of beam voltage and undulator field strength. A 1 kW TWT has been used as the input source for broadband measurements and two 25 kW magnetrons for saturated output power measurements at discrete frequencies. Results show an instantaneous −3 dB bandwidth of 30% for a fixed cathode voltage and magnetic field. The device can be tuned over a range of 65% of the centre frequency by adjusting the cathode voltage. A saturated power of over 1 MW has been measured for 50 A input current. Broadband unsaturated gains of over 35 dB have been measured. An experiment using a 50 A beam from a thermionic cathode electron gun designed at Strathclyde is currently in progress. This will theoretically allow CW operation of the FEM using a DC undulator magnet and DC power source.

AB - We present results from the X-band reversed guide magnetic field Raman Free Electron Maser (FEM) amplifier experiment at Strathclyde University. The FEM has been designed for zero slippage to achieve maximum instantaneous bandwidth. The tuneablity is further extended by the adjustment of beam voltage and undulator field strength. A 1 kW TWT has been used as the input source for broadband measurements and two 25 kW magnetrons for saturated output power measurements at discrete frequencies. Results show an instantaneous −3 dB bandwidth of 30% for a fixed cathode voltage and magnetic field. The device can be tuned over a range of 65% of the centre frequency by adjusting the cathode voltage. A saturated power of over 1 MW has been measured for 50 A input current. Broadband unsaturated gains of over 35 dB have been measured. An experiment using a 50 A beam from a thermionic cathode electron gun designed at Strathclyde is currently in progress. This will theoretically allow CW operation of the FEM using a DC undulator magnet and DC power source.

KW - free electron maser amplifier

KW - experiments

UR - http:dx.doi.org/10.1016/S0168-9002(00)00083-8

U2 - 10.1016/S0168-9002(00)00083-8

DO - 10.1016/S0168-9002(00)00083-8

M3 - Article

VL - 445

SP - 272

EP - 275

JO - Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

JF - Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

SN - 0168-9002

IS - 1-3

ER -