{"id":8917,"date":"2021-03-30T09:03:19","date_gmt":"2021-03-30T09:03:19","guid":{"rendered":"https:\/\/www.istp.cnr.it\/?post_type=product&#038;p=8917"},"modified":"2022-11-11T10:25:59","modified_gmt":"2022-11-11T10:25:59","slug":"development-of-a-set-of-movable-electrostatic-probes-to-characterize-the-plasma-in-the-iter-neutral-beam-negative-ion-source-prototype-2","status":"publish","type":"product","link":"https:\/\/www.istp.cnr.it\/it\/research-product\/development-of-a-set-of-movable-electrostatic-probes-to-characterize-the-plasma-in-the-iter-neutral-beam-negative-ion-source-prototype-2\/","title":{"rendered":"Development of a set of movable electrostatic probes to characterize the plasma in the ITER neutral beam negative-ion source prototype"},"content":{"rendered":"<p>We present the development and first use of a set of movable electrostatic probes on the full-scale ITER heating neutral beam prototype negative-ion source SPIDER. The probes access the ion source plasma from the multi-aperture accelerator aiming at the study of the plasma formation and expansion from the RF drivers through the transverse magnetic filter. The magnetic filter separates the relatively high electron-temperature region for plasma formation and hydrogen dissociation form the negative-ion extraction region in which low electron-temperature is required to avoid negative-ion destruction, but also causes non-uniformities and drifts in the large plasma discharge which will be studied by this setup. The set of electrostatic probes encompasses eight RF-compensated Langmuir probes, one double probe, one Mach probe for the assessment of plasma drift velocities, and two gridded retarding field energy analyzers to measure the positive-ion energy distribution function. Electric aspects as well as mechanical constraints given by the large in-vacuum movable structure, and thermal requirements of these relatively heat-flux components made the design challenging. Prototyping and commissioning of the measurement system is discussed offering examples of measured characteristics with the various probes.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Sartori E.; Brombin M.; Laterza B.; Zuin M.; Cavazzana R.; Cervaro V.; Degli Agostini F.; Fadone M.; Fasolo D.; Grando L.; Jain P.; Kisaki M.; Maistrello A.; Moro G.; Pimazzoni A.; Poggi C.; Segalini B.; Shepherd A.; Spolaore M.; Taliercio C.; Tollin M.; Ugoletti M.; Veltri P.; Zamengo A.; Serianni G.<\/p>\n","protected":false},"featured_media":1294,"comment_status":"closed","ping_status":"open","template":"","meta":[],"product_cat":[574],"product_tag":[1087,1661,1758,2823],"class_list":["post-8917","product","type-product","status-publish","has-post-thumbnail","hentry","product_cat-journal-articles","product_tag-negative-ions","product_tag-iter-heating-neutral-beam-injector","product_tag-electrostatic-probes","product_tag-beam-sources","prodpage-style2"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.istp.cnr.it\/it\/wp-json\/wp\/v2\/product\/8917","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.istp.cnr.it\/it\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/www.istp.cnr.it\/it\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/www.istp.cnr.it\/it\/wp-json\/wp\/v2\/comments?post=8917"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.istp.cnr.it\/it\/wp-json\/wp\/v2\/media\/1294"}],"wp:attachment":[{"href":"https:\/\/www.istp.cnr.it\/it\/wp-json\/wp\/v2\/media?parent=8917"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.istp.cnr.it\/it\/wp-json\/wp\/v2\/product_cat?post=8917"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.istp.cnr.it\/it\/wp-json\/wp\/v2\/product_tag?post=8917"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}