Improvements of the versatile multiaperture negative ion source NIO1 | Zendy

M. Cavenago | Zendy; G. Serianni | Zendy; M. De Muri | Zendy; P. Veltri | Zendy; V. Antoni | Zendy; C. Baltador | Zendy; M. Barbisan | Zendy; M. Brombin | Zendy; A. Galatà | Zendy; N. Ippolito | Zendy; T. V. Kulevoy | Zendy; R. Pasqualotto | Zendy; S. V. Petrenko | Zendy; A. Pimazzoni | Zendy; M. Recchia | Zendy; E. Sartori | Zendy; F. Taccogna | Zendy; V. Variale | Zendy; B. Zaniol | Zendy; P. Barbato | Zendy; L. Baseggio | Zendy; V. Cervaro | Zendy; D. Fasolo | Zendy; L. Franchin | Zendy; R. Ghiraldelli | Zendy; B. Laterza | Zendy; M. Maniero | Zendy; D. Martini | Zendy; L. Migliorato | Zendy; A. Minarello | Zendy; F. Molon | Zendy; G. Moro | Zendy; T. Patton | Zendy; D. Ravarotto | Zendy; R. Rizzieri | Zendy; A. Rizzolo | Zendy; Maurizio Sattin | Zendy; F. Stivanello | Zendy; S. Zucchetti | Zendy

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Improvements of the versatile multiaperture negative ion source NIO1

Author(s) -

M. Cavenago,

G. Serianni,

M. De Muri,

P. Veltri,

V. Antoni,

C. Baltador,

M. Barbisan,

M. Brombin,

A. Galatà,

N. Ippolito,

T. V. Kulevoy,

R. Pasqualotto,

S. V. Petrenko,

A. Pimazzoni,

M. Recchia,

E. Sartori,

F. Taccogna,

V. Variale,

B. Zaniol,

P. Barbato,

L. Baseggio,

V. Cervaro,

D. Fasolo,

L. Franchin,

R. Ghiraldelli,

B. Laterza,

M. Maniero,

D. Martini,

L. Migliorato,

A. Minarello,

F. Molon,

G. Moro,

T. Patton,

D. Ravarotto,

R. Rizzieri,

A. Rizzolo,

Maurizio Sattin,

F. Stivanello,

S. Zucchetti

Publication year - 2017

Publication title -

aip conference proceedings

Language(s) - English

Resource type - Conference proceedings

SCImago Journal Rank - 0.177

H-Index - 75

eISSN - 1551-7616

pISSN - 0094-243X

DOI - 10.1063/1.4995727

Subject(s) - perveance , atomic physics , caesium , ion , hydrogen , ion source , voltage , plasma , materials science , beam (structure) , ion beam , kstar , acceleration voltage , chemistry , analytical chemistry (journal) , ion gun , cathode ray , electron , optics , electrical engineering , physics , tokamak , nuclear physics , organic chemistry , chromatography , engineering

The ion source NIO1 (Negative Ion Optimization 1) was developed and installed as a reduced-size model of multi-aperture sources used in neutral beam injectors. NIO1 beam optics is optimized for a 135 mA H− current (subdivided in 9 beamlets) at a Vs = 60 kV extraction voltage, with an electron-to-ion current ratio Rj up to 2. Depending on gas pressure used, NIO1 was up to now operated with Vs < 25 kV for beam extraction and Vs = 60 kV for insulation tests. The distinction between capacitively coupled plasma (E-mode, consistent with a low electron density plasma ne) and inductively coupled plasma (H-mode, requiring larger ne) was clearly related to several experimental signatures, and was confirmed for several gases, when applied radiofrequency power exceeds a given threshold Pt (with hysteresis). For hydrogen Pt was reduced below 1 kW, with a clean rf window and molybdenum liners on other walls; for oxygen Pt ≤ 400 W. Beams of H− and O− were separately extracted; since no caesium is yet introduced into the...

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