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TJ-II:Heavy Ion Beam Probe: Difference between revisions
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[[TJ-II]] disposes of Heavy Ion Beam Probe systems. | |||
== HIBP 1 == | |||
[[File:TJ-II_HIBP_diagram.png|350px|thumb|right|HIBP probe diagram]] | [[File:TJ-II_HIBP_diagram.png|350px|thumb|right|HIBP probe diagram]] | ||
The advanced Heavy Ion Beam Probe can simultaneously measure the plasma electric potential ''φ'', the electron density ''n<sub>e</sub>'', and a poloidal magnetic field component ''B<sub>p</sub>'' at a point inside the plasma. | |||
<ref>[http://link.aip.org/link/?RSINAK/72/583/1 I.S. Bondarenko et al., ''Installation of an advanced heavy ion beam diagnostic on the TJ-II stellarator'', Rev. Sci. Instrum. '''72''', 583 (2001)]</ref> | <ref>[http://link.aip.org/link/?RSINAK/72/583/1 I.S. Bondarenko et al., ''Installation of an advanced heavy ion beam diagnostic on the TJ-II stellarator'', Rev. Sci. Instrum. '''72''', 583 (2001)]</ref> | ||
<ref>[http://dx.doi.org/10.1016/S0920-3796(01)00428-8 L.I. Krupnik et al., ''The first operation of the advanced heavy ion beam probing diagnostic on the TJ-II flexible heliac'', Fusion Engineering and Design '''56-57''' (2001) 935]</ref> | <ref>[http://dx.doi.org/10.1016/S0920-3796(01)00428-8 L.I. Krupnik et al., ''The first operation of the advanced heavy ion beam probing diagnostic on the TJ-II flexible heliac'', Fusion Engineering and Design '''56-57''' (2001) 935]</ref> | ||
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<ref>[http://link.aip.org/link/?RSINAK/75/3511/1 B. Gonçalves et al, ''Operation of a multiple cell array detector in plasma experiments with a heavy ion beam diagnostic'', Rev. Sci. Instrum. '''75''' (2004) 3511]</ref> | <ref>[http://link.aip.org/link/?RSINAK/75/3511/1 B. Gonçalves et al, ''Operation of a multiple cell array detector in plasma experiments with a heavy ion beam diagnostic'', Rev. Sci. Instrum. '''75''' (2004) 3511]</ref> | ||
The system is located in [[TJ-II:Sectors|sector]] B4. | The system is located in [[TJ-II:Sectors|sector]] B4. | ||
A second, similar system is currently being installed in [[TJ-II:Sectors|sector]] A4. | [[File:TJ-II_HIBP.png|350px|thumb|right|HIBP probe composite photo (taken around 2002)]] | ||
[[File: | |||
== HIBP 2 == | |||
A second, similar system is currently being installed in [[TJ-II:Sectors|sector]] A4 (see photo). | |||
[[File:IMG 1627.JPG|350px|thumb|right|Installation of the second HIBP probe (January, 2011)]] | |||
== Operation principle == | == Operation principle == | ||
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===Formal expression of the electric potential <math>\phi</math>=== | ===Formal expression of the electric potential <math>\phi</math>=== | ||
Refering to the figure, we will denote as <math>A</math>, <math>B</math> and <math>C</math> the injection, ionization and detection points respectively. The Hamiltonian of a charge in an electromagnetic field is | Refering to the figure, we will denote as <math>A</math>, <math>B</math> and <math>C</math> the injection, ionization and detection points respectively. The Hamiltonian of a charge in an electromagnetic field is | ||
[[Image:HIBP3.png|256px|thumb| | [[Image:HIBP3.png|256px|thumb|right|alt=Schematic HIBP operation principle.|Schematic HIBP operation principle.]] | ||
:<math> | :<math> | ||