High current proton source based on ECR discharge sustained by 37.5 GHz gyrotron radiation

Abstract

Formation of hydrogen ion beams with high intensity and low transverse emittance is one of the key challenges in accelerator technology. Present work is devoted to experimental investigation of proton beam production from dense plasma (Ne > 10 13 cm −3 ) of an ECR discharge sustained by 37.5 GHz, 100 kW gyrotron radiation at SMIS 37 facility at IAP RAS. The anticipated advantages of the SMIS 37 gasdynamic ion source over the current state-of-the-art proton source technology based on 2.45 GHz hydrogen discharges are described. Experimental result obtained with different extraction configurations i.e. single-and multi-aperture systems are presented. It was demonstrated that ultra bright proton beam with approximately 4.5 mA current and 0.03 π•mm•mrad normalized emittance can be produced with the single-aperture (1 mm in diameter) extraction, the corresponding brightness being 5 A/(π•mm•mrad) 2 . For production of high current beams a multi-aperture extractor was used resulting to a record of 200 mA / 1.1 π•mm•mrad normalized emittance proton beam. The species fraction i.e. the ratio of H + to H + 2 current was recorded to be > 90 % for all extraction systems. A possibility of further enhancement of the beam parameters by improvements of the extraction system and its power supply is discussed.

Powerful neutron generators based on high current ECR ion sources with gyrotron plasma heating

“…Experiments aimed to demonstrate the benefits of the high current gasdynamic ECR ion source as a part of D-D neutron generator were conducted at SMIS 37 facility [2], schematically depicted in Fig. 1.…”

“…Studies of the extracted charge state distribution have shown that 94% of it consists of atomic deuterons (D+) (contribution of molecular D 2 + ions is less than 6%). For our knowledge such combination of parameters makes the obtained beam the brightest for any kind of ion sources with normalized rms brightness value of 100 A/( pi·mm·mrad) 2 .…”

H+ and D+ high current ion beams formation from ECR discharge sustained by 75 GHz gyrotron radiation

“…The experimental results described in [4,5] demonstrate the feasibility of high power millimeter wave quasigasdynamic ECR ion sources for the production of high brightness proton beams with favorable species fraction. For the next experimental step on H+ and D+ ion beams production SMIS 37 facility was upgraded up to SMIS 75 by replacing of the old gyrotron with the new one with 75 GHz radiation frequency and 200 kW peak power.…”

New progress of high current gasdynamic ion source (invited)

“…Due to this coincidence, it was decided to test the gasdynamic ECR source performance for proton and deuteron beams formation. In previous papers, 15,16 it was demonstrated that proton beams with current of hundreds of mA could be produced. The latest results are presented below.…”