TUCO-B  —  New Sources/RF Power   (16-Sep-08   10:30—12:30)

Chair: T. Lamy, LPSC, Grenoble

Paper Title Page
TUCO-B02 Microwave Sources for 3rd and 4th Generation of ECRIS 136
 
  • Yu. V. Bykov, V. Skalyga
    IAP/RAS, Nizhny Novgorod
 
  Recent results in the development of ECRIS have proven the potential of an increase in the operating frequency for the production of high intensity multicharge ion beams. The next ambitious steps are discussed today which involve a further increase in frequency up to 60 GHz and the use of broadband microwave sources. Microwave sources capable of meeting the needs of the next generation of ECRIS are considered here, basing on the many years experience of the IAP in design and fabrication of a customer produced high power millimeter-wave equipment. Different types of vacuum electron tubes such as gyro-backward wave oscillators, gyro-traveling wave tubes and gyro-klystrons operating in the frequency range of 30-60 GHz are discussed and compared in terms of a power, gain, frequency band and the rate of frequency sweeping. The results obtained to this date demonstrate that microwave power of 10-15 kW CW in this frequency range and the frequency band up to 10% can be achieved in these sources. The design of mode filters and DC breakers which are the most crucial components of the microwave power transmission line is considered.  
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TUCO-B03 On the Observation of Standing Waves in Cylindrical Cavities Filled by Microwave Discharge and ECR Plasmas 140
 
  • L. Celona, G. Ciavola, N. Gambino, S. Gammino, F. Maimone, D. Mascali, R. Miracoli
    INFN/LNS, Catania
 
  Experimental measurements of the scattering parameters carried out in microwave discharge and ECR ion sources will be hereinafter described. The details of different tests performed on a 14.5 GHz operating ECR ion source and on a plasma reactor operating at 2.45 GHz for enviromental purposes are reported. In particular this last device, equipped with a Langmuir probe, has been very useful to verify the presence of stationary waves and to study the electromagnetic wave propagation in plasmas. The evaluation of the Q factor with and without plasma and the determination of its variation with plasma density and temperature will be also presented.  
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TUCO-B04 Broadband Excitation of ECR Plasmas 145
 
  • W. D. Cornelius
    SSolutions, San Diego CA
 
  Funding: This material is based upon work supported by the U. S. Department of Energy under Award Number DE-FG02-04ER84166.

Scientific Solutions developed an rf source capable of producing a variety of rf spectra for excitation of ECR plasmas at 2.45, 6.5, 14.5, 18.0, and 28.0 GHz. This device replaces the crystal oscillator in the rf chain and is essentially a software-defined radio transmitter that allows the user to select from a variety of rf spectral patterns via an Ethernet link. Two specific types of patterns were chosen for an initial series of tests: 1) a simultaneous multimode pattern comprised of a number rf-modes within a user-specified bandwidth and 2) a "chirp" spectral pattern comprised of a series of discrete frequencies where the chirp bandwidth, slew direction, and slew rate are user-selectable. The number of modes is a user-defined value between 1 and 1024. This paper describes the design of the rf circuit and its theory of operation. Initial results of our tests with the 6.4 and 14.5 GHz ECR sources at Texas A&M University and with the 14.5 GHz AECR-U source at the Lawerence Berkeley National Laboratory are also presented.

*Current Address: SAIC, 10740 Thornmint Road, San Diego, CA 92127

 
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