Cs feed tests and emittance measurements on a modified MC-SNICS ion source for radiocarbon AMS

John Southon; Guaciara dos Santos; Baoxi Han

doi:10.1017/S0033822200042223

Cs feed tests and emittance measurements on a modified MC-SNICS ion source for radiocarbon AMS

John Southon, Guaciara dos Santos, Baoxi Han

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11 Scopus citations

Abstract

We report on 2 recent developments in an ongoing program of characterizing and improving the National Electrostatics Corp. (NEC) MC-SNICS ion source at University of California (UC) Irvine's Keck AMS laboratory. First, we have investigated the possibility of modifying a large-body (134-sample) MC-SNICS to incorporate the UC Irvine Cs oven and vacuum-insulated Cs feed tube, which provide better confinement of Cs than the standard NEC setup. In our 40-sample source, the feed tube enters the source housing directly below the ionizer assembly. This area cannot be accessed for machining on the 134-sample source, but we have successfully tested a modified geometry where the delivery tube enters the body via the source end flange. Second, we recently installed a second beam profile monitor in the injection line of our spectrometer to allow us to make online emittance measurements. At full output (150 μA of C^-at 55 keV), the emittance of our source at 8 kV sputtering voltage is approximately 40π mm mrad.

Original language	English
Pages (from-to)	301-306
Number of pages	6
Journal	Radiocarbon
Volume	49
Issue number	2
DOIs	https://doi.org/10.1017/S0033822200042223
State	Published - Nov 2007
Externally published	Yes

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title = "Cs feed tests and emittance measurements on a modified MC-SNICS ion source for radiocarbon AMS",

abstract = "We report on 2 recent developments in an ongoing program of characterizing and improving the National Electrostatics Corp. (NEC) MC-SNICS ion source at University of California (UC) Irvine's Keck AMS laboratory. First, we have investigated the possibility of modifying a large-body (134-sample) MC-SNICS to incorporate the UC Irvine Cs oven and vacuum-insulated Cs feed tube, which provide better confinement of Cs than the standard NEC setup. In our 40-sample source, the feed tube enters the source housing directly below the ionizer assembly. This area cannot be accessed for machining on the 134-sample source, but we have successfully tested a modified geometry where the delivery tube enters the body via the source end flange. Second, we recently installed a second beam profile monitor in the injection line of our spectrometer to allow us to make online emittance measurements. At full output (150 μA of C-at 55 keV), the emittance of our source at 8 kV sputtering voltage is approximately 40π mm mrad.",

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AU - Southon, John

AU - dos Santos, Guaciara

AU - Han, Baoxi

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AB - We report on 2 recent developments in an ongoing program of characterizing and improving the National Electrostatics Corp. (NEC) MC-SNICS ion source at University of California (UC) Irvine's Keck AMS laboratory. First, we have investigated the possibility of modifying a large-body (134-sample) MC-SNICS to incorporate the UC Irvine Cs oven and vacuum-insulated Cs feed tube, which provide better confinement of Cs than the standard NEC setup. In our 40-sample source, the feed tube enters the source housing directly below the ionizer assembly. This area cannot be accessed for machining on the 134-sample source, but we have successfully tested a modified geometry where the delivery tube enters the body via the source end flange. Second, we recently installed a second beam profile monitor in the injection line of our spectrometer to allow us to make online emittance measurements. At full output (150 μA of C-at 55 keV), the emittance of our source at 8 kV sputtering voltage is approximately 40π mm mrad.

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Cs feed tests and emittance measurements on a modified MC-SNICS ion source for radiocarbon AMS

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