372596163

372596163



133

RIKEN Accel. Próg. Rep. 24 (1990)

V. DEVELOPMENT OF ACCELERATOR FACILITIES

1. lon Accelerator Development

1. Test-Bench Performance of ECR lon Source (NEOMAFIOS)

E. Ikezawa, Y. Miyazawa, M. Hemmi, Y. Chiba, T. Chiba,

M. Kasę, M. Fujimaki, T. Aihara,* T. Ohki,* and H. Hasebe*

An ECR (Electron Cyclotron Resonance) ion source NEOMAFIOS11 developed by the ion source development group of C.E.N.-G. (Centre d’Etudes Nucleaires de Grenoble) in France has the features of a smali size and Iow power consumption owing to the permanent magnets (FeNdB) used for both the hexapole field and mirror field. We purchased a set of NEOMAFIOS to replace the FIG source presently used in RILAC because the narrow space of RILAC and the limited power supply capacity of the ion source site. Figurę 1 shows the schematic drawing of the source and labie 1 shows its main parameters.

The performance test of NEOMAFIOS was car-ried out from March to July 1990 on a test bench capable of analyzing charge-states. Operations with 8 gaseous and 25 solid elements were tried and optimum operational parameters were searched for several ion species. In a usual operation, an RF power of less than 400 W is enough and the operat-ing pressure is 3 x 10“7 - 1 x 10 (l Torr at the extraction electrode. Ion charge-state spectra were mesured with one to several sets of operational parameters for each element. Figurę 2 shows a typical spectrum obtained with Pb.

B *»«>! rr>wcl

I

UH* f««d

u _    -V

• a

W •    i i

l    ft    I

*4»

Table 1. Main parameters of the source.

Magnetic parameters

Materiał of permanent magnet

FeNdB

Magnetic field on axis

0.21-0.52 T

Electric power

0 kW

Microwave parameters

RF frequency

8 GHz

RF power injection

Axial

RF power

1.7 kW max

Finał tubę (Klystron)

Thomson TH-2461

Electric power consumption

5 kVA

Yacuum window

Al20

Dimensions

Chamber diameter

66 mm

Chamber length

148 mm

Ion outlet borę

10 mm

Extraction electrode borę

16 mm

Extraction gap

45 mm

Extraction voltage

10 kV

AnaJyzinR maRnet current (A)

Fig. 2. Charge-state spectrum with Pb optimized at an 18+ peak. RF power, 270 W; Beam extraction voltage, 10 kV; Mixing gas, 02.

Fig. 1. Schematic drawing of the source.

* Sumijyu Accelerator Service, Ltd.



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