First results from beam emission spectroscopy in SPIDER negative ion source

被引:10
作者
Barbisan, M. [1 ]
Zaniol, B. [1 ]
Pasqualotto, R. [1 ]
Serianni, G. [1 ]
Ugoletti, M. [1 ]
机构
[1] Univ Padua, Consorzio RFX, CNR, ENEA,INFN,Acciaierie Venete SpA, Cso Stati Uniti 4, I-35127 Padua, Italy
关键词
emission spectroscopy; negative ions sources; beam diagnostics; neutral beam injector; doppler spectroscopy; HOMOGENEITY; OPERATION;
D O I
10.1088/1361-6587/ac2eb2
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
The SPIDER experiment, part of the neutral beam test facility at Consorzio RFX (Padua, Italy), is the prototype of the negative ion source for the ITER neutral beam injectors; the source is coupled to a 100 kV three-grid acceleration system. A beam emission spectroscopy (BES) diagnostic was installed in SPIDER to study and optimize the energy distribution, aim, uniformity and divergence of the H-/D- beam extracted from the source. The diagnostic is based on analysis of the Doppler shifted H-alpha /D-alpha light emitted in the interaction between the beam particles and the H (2)/D (2) molecules of the background. In 2019 the BES diagnostic in SPIDER was installed and calibrated, allowing us to characterize the first hydrogen beams extracted from the SPIDER source, in cesium-free conditions. The number of active beamlets of which the beam was composed was reduced from 1280 to 80, affecting the BES diagnostic capabilities. This paper presents the BES diagnostic setup and discusses the first collected results. Under limited extracted current density (similar to 10 A m(-2)) and ion energy (<= 35 keV), no significant vertical beam deflection caused by the magnetic filter field in the source was detected. In some cases the beamlets were observed to be elongated in the horizontal direction; beamlet divergence values down to 20 mrad and 30 mrad e-folding were measured in the vertical and horizontal directions, respectively; the intensity of the Doppler shifted radiation was found to be strongly correlated to the beam current and to the beam divergence. The progressive compensation of beamlet deflections (caused by electron suppression filter fields), with increasing voltage in the extraction gap, was studied.
引用
收藏
页数:11
相关论文
共 38 条
[1]   Physics and engineering design of the accelerator and electron dump for SPIDER [J].
Agostinetti, P. ;
Antoni, V. ;
Cavenago, M. ;
Chitarin, G. ;
Marconato, N. ;
Marcuzzi, D. ;
Pilan, N. ;
Serianni, G. ;
Sonato, P. ;
Veltri, P. ;
Zaccaria, P. .
NUCLEAR FUSION, 2011, 51 (06)
[2]   Development and first operation of a cavity ring down spectroscopy diagnostic in the negative ion source SPIDER [J].
Barbisan, M. ;
Pasqualotto, R. ;
Agnello, R. ;
Pilieci, M. ;
Serianni, G. ;
Taliercio, C. ;
Cervaro, V ;
Rossetto, F. ;
Tiso, A. .
REVIEW OF SCIENTIFIC INSTRUMENTS, 2021, 92 (05)
[3]   Beam characterization by means of emission spectroscopy in the ELISE test facility [J].
Barbisan, M. ;
Bonomo, F. ;
Fantz, U. ;
Wuenderlich, D. .
PLASMA PHYSICS AND CONTROLLED FUSION, 2017, 59 (05)
[4]   Modeling and simulation of a beam emission spectroscopy diagnostic for the ITER prototype neutral beam injector [J].
Barbisan, M. ;
Zaniol, B. ;
Pasqualotto, R. .
REVIEW OF SCIENTIFIC INSTRUMENTS, 2014, 85 (11)
[5]   Modeling and design of a beam emission spectroscopy diagnostic for the negative ion source NIO1 [J].
Barbisan, M. ;
Zaniol, B. ;
Cavenago, M. ;
Pasqualotto, R. .
REVIEW OF SCIENTIFIC INSTRUMENTS, 2014, 85 (02)
[6]  
Barbisan M., 2015, THESIS U STUDI PADOV
[7]  
Barnett CF., 1990, ORNL REDBOOK, V1, DOI [10.2172/6570226, DOI 10.2172/6570226]
[8]   DOPPLER SPECTROSCOPY ON HIGH-POWER NEUTRAL BEAMS [J].
BONNAL, JF ;
BRACCO, G ;
BRETON, C ;
DEMICHELIS, C ;
DRUAUX, J ;
MATTIOLI, M ;
OBERSON, R ;
RAMETTE, J .
JOURNAL OF PHYSICS D-APPLIED PHYSICS, 1982, 15 (05) :805-822
[9]   BATMAN Beam Properties Characterization by the Beam Emission Spectroscopy Diagnostic [J].
Bonomo, F. ;
Ruf, B. ;
Barbisan, M. ;
Cristofaro, S. ;
Schiesko, L. ;
Fantz, U. ;
Franzen, P. ;
Pasqualotto, R. ;
Riedl, R. ;
Serianni, G. ;
Wuenderlich, D. .
FOURTH INTERNATIONAL SYMPOSIUM ON NEGATIVE IONS, BEAMS AND SOURCES (NIBS 2014), 2015, 1655
[10]   HIGH-POWER NEUTRAL-BEAM ANGULAR-DIVERGENCE EVALUATION FROM SPECTRALLY RESOLVED DOPPLER MEASUREMENTS [J].
BRACCO, G ;
BRETON, C ;
DEMICHELIS, C ;
MATTIOLI, M ;
RAMETTE, J .
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA, 1981, 71 (11) :1318-1326