Matches in SemOpenAlex for { <https://semopenalex.org/work/W2896622301> ?p ?o ?g. }
Showing items 1 to 75 of
75
with 100 items per page.
- W2896622301 abstract "A Penning-type surface-plasma negative hydrogen (H-) ion source has been delivering beam at the ISIS pulsed spallation neutron and muon facility for over thirty years. It is one of the most powerful and well-renowned H- sources in the world. Although long-term experience has allowed the source to be operated reliably and set up in a repeatable way, it is treated as something of a 'black box': the detailed plasma physics of why it works has always been unclear. A vacuum Vessel for Extraction and Source Plasma Analyses (VESPA) has been developed to understand the ISIS ion source plasma and improve the beam extracted from it. The VESPA ion source is operated in a completely new regime whereby the analysing sector dipole magnet housed inside a refrigerated 'cold box', presently used on ISIS, is replaced by an on-axis extraction system. The new extraction system incorporates a novel einzel lens with an elliptical aperture. This is the first demonstration of an elliptical einzel being used to focus an asymmetric H- ion beam. With the dipole magnet removed, the ion source has been shown to produce 85 mA of H- beam current at normal settings; of which 80 mA is transported through the new einzel lens system, with a normalised RMS emittance of 0.2 π mm mrad. Optical emission spectroscopy measurements have shown a plasma density of 1019 m–3, an H2 dissociation rate of 70%, an almost constant electron temperature of 3.5 eV and an atomic temperature which linearly increases above the electron temperature. In support of these principal measurements, rigorous particle tracking, electrostatic and thermal simulations were performed. In addition, a suite of new equipment was manufactured by the author. This includes a fast pressure gauge, a temperature controller, a high voltage einzel lens circuit, a fast beam chopper and a caesium detection system." @default.
- W2896622301 created "2018-10-26" @default.
- W2896622301 creator A5072730104 @default.
- W2896622301 date "2017-01-01" @default.
- W2896622301 modified "2023-09-23" @default.
- W2896622301 title "Understanding the plasma and improving extraction of the ISIS Penning H⁻ ions source" @default.
- W2896622301 hasPublicationYear "2017" @default.
- W2896622301 type Work @default.
- W2896622301 sameAs 2896622301 @default.
- W2896622301 citedByCount "0" @default.
- W2896622301 crossrefType "dissertation" @default.
- W2896622301 hasAuthorship W2896622301A5072730104 @default.
- W2896622301 hasConcept C107920040 @default.
- W2896622301 hasConcept C120665830 @default.
- W2896622301 hasConcept C121332964 @default.
- W2896622301 hasConcept C152568617 @default.
- W2896622301 hasConcept C16389437 @default.
- W2896622301 hasConcept C168834538 @default.
- W2896622301 hasConcept C172108966 @default.
- W2896622301 hasConcept C181833780 @default.
- W2896622301 hasConcept C182213014 @default.
- W2896622301 hasConcept C184779094 @default.
- W2896622301 hasConcept C185544564 @default.
- W2896622301 hasConcept C185592680 @default.
- W2896622301 hasConcept C188224857 @default.
- W2896622301 hasConcept C192562407 @default.
- W2896622301 hasConcept C2777365357 @default.
- W2896622301 hasConcept C50774322 @default.
- W2896622301 hasConcept C62520636 @default.
- W2896622301 hasConcept C82706917 @default.
- W2896622301 hasConceptScore W2896622301C107920040 @default.
- W2896622301 hasConceptScore W2896622301C120665830 @default.
- W2896622301 hasConceptScore W2896622301C121332964 @default.
- W2896622301 hasConceptScore W2896622301C152568617 @default.
- W2896622301 hasConceptScore W2896622301C16389437 @default.
- W2896622301 hasConceptScore W2896622301C168834538 @default.
- W2896622301 hasConceptScore W2896622301C172108966 @default.
- W2896622301 hasConceptScore W2896622301C181833780 @default.
- W2896622301 hasConceptScore W2896622301C182213014 @default.
- W2896622301 hasConceptScore W2896622301C184779094 @default.
- W2896622301 hasConceptScore W2896622301C185544564 @default.
- W2896622301 hasConceptScore W2896622301C185592680 @default.
- W2896622301 hasConceptScore W2896622301C188224857 @default.
- W2896622301 hasConceptScore W2896622301C192562407 @default.
- W2896622301 hasConceptScore W2896622301C2777365357 @default.
- W2896622301 hasConceptScore W2896622301C50774322 @default.
- W2896622301 hasConceptScore W2896622301C62520636 @default.
- W2896622301 hasConceptScore W2896622301C82706917 @default.
- W2896622301 hasLocation W28966223011 @default.
- W2896622301 hasOpenAccess W2896622301 @default.
- W2896622301 hasPrimaryLocation W28966223011 @default.
- W2896622301 hasRelatedWork W1538637571 @default.
- W2896622301 hasRelatedWork W1567572613 @default.
- W2896622301 hasRelatedWork W1983756135 @default.
- W2896622301 hasRelatedWork W1988907674 @default.
- W2896622301 hasRelatedWork W1995239221 @default.
- W2896622301 hasRelatedWork W2004762309 @default.
- W2896622301 hasRelatedWork W2010506768 @default.
- W2896622301 hasRelatedWork W2031969754 @default.
- W2896622301 hasRelatedWork W2033290891 @default.
- W2896622301 hasRelatedWork W2038175663 @default.
- W2896622301 hasRelatedWork W2050117975 @default.
- W2896622301 hasRelatedWork W2059046684 @default.
- W2896622301 hasRelatedWork W2060203779 @default.
- W2896622301 hasRelatedWork W2070388978 @default.
- W2896622301 hasRelatedWork W2075096360 @default.
- W2896622301 hasRelatedWork W2083994941 @default.
- W2896622301 hasRelatedWork W2114979004 @default.
- W2896622301 hasRelatedWork W2241070659 @default.
- W2896622301 hasRelatedWork W2294498274 @default.
- W2896622301 hasRelatedWork W774557231 @default.
- W2896622301 isParatext "false" @default.
- W2896622301 isRetracted "false" @default.
- W2896622301 magId "2896622301" @default.
- W2896622301 workType "dissertation" @default.