Next Generation ECRIS

Paper	Title	Page
TUCO-A03	60 GHz Electron Cyclotron Resonance Ion Source for Beta-Beams	131
	T. Thuillier, C. Fourel, J. Giraud, T. Lamy, L. Latrasse LPSC, Grenoble F. Debray, J. M. Dumas, P. Sala, C. Trophime GHMFL, Grenoble
	Electron Cyclotron Resonance Ion Sources (ECRIS) are very efficient to produce continuous and pulsed ion beams. The ECRIS scaling laws show that the plasma density increases as the square of the microwave frequency. Consequently, the efficiency, the average charge of the ionic charge state distribution and the extracted currents increase as well. LPSC is developing a 60 GHz pulsed ion source prototype. In order to have efficient ionization, the ion source volume has to be small, and due to the frequency value, the magnetic field has to be high (6 T at the injection, 3 T at the extraction, a closed surface with |B| = 2.1 T and a magnetic mirror of 4 T). The generation of the high magnetic field requires the use of helix techniques developed at GHMFL. As a first approach, a cusp structure has been chosen. 2D and 3D simulations were used to define the geometry of the helixes. Calculus has shown that it is necessary to use 2 groups of 2 coaxial helixes. An aluminum helix prototype has been machined to test at low current density the accuracy of the calculations. The axial magnetic field of the prototype was measured and results are in very good agreement with the numerical values.
	Slides
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.
	Slides