CHICO2, a two-dimensional pixelated parallel-plate avalanche counter
Abstract
CHICO2 (Compact Heavy Ion COunter), is a large solid-angle, charged-particle detector array developed to provide both θ and Φ angle resolutions matching those of GRETINA (Gamma-Ray Energy Tracking In-beam Nuclear Array). CHICO2 was successfully tested at the Argonne National Laboratory where it was fielded as an auxiliary detector with GRETINA for γ-ray spectroscopic studies of nuclei using a 252Cf spontaneous fission source, stable beams, and radioactive beams from CARIBU. In field tests of the 72,76Ge beams on a 0.5 mg/cm2208Pb target at the sub-barrier energy, CHICO2 provided charged-particle angle resolutions (FWHM) of 1.55° in θ and 2.47° in Φ. This achieves the design goal for both coordinates assuming a beam-spot size (>3 mm) and the target thickness (>0.5 mg/cm 2). The combined angular resolution of GRETINA/CHICO2 resulted in a Doppler-shift corrected energy resolution of 0.60% for 1 MeV coincident de-excitation γ-rays. This is nearly a factor of two improvements in resolution and sensitivity compared to Gammasphere/CHICO. Kinematically-coincident detection of scattered ions by CHICO2 still maintains the mass resolution (ΔM/M) of ~5% that enhanced isolation of scattered weak beams of interest from scattered contaminant beams.
- Authors:
-
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Univ. of Rochester, NY (United States)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Swan Research LLC., Owosso, MI (United States)
- CAEN Technologies, Staten Island, NY (United States)
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Publication Date:
- Research Org.:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Nuclear Physics (NP)
- OSTI Identifier:
- 1237583
- Alternate Identifier(s):
- OSTI ID: 1341763
- Report Number(s):
- LLNL-JRNL-678687
Journal ID: ISSN 0168-9002
- Grant/Contract Number:
- AC52-07NA27344
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment
- Additional Journal Information:
- Journal Volume: 814; Journal ID: ISSN 0168-9002
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; parallel-plate avalanche counter; charged-particle detection; pixilation; radioactive beams
Citation Formats
Wu, C. Y., Cline, D., Hayes, A., Flight, R. S., Melchionna, A. M., Zhou, C., Lee, I. Y., Swan, D., Fox, R., and Anderson, J. T. CHICO2, a two-dimensional pixelated parallel-plate avalanche counter. United States: N. p., 2016.
Web. doi:10.1016/j.nima.2016.01.034.
Wu, C. Y., Cline, D., Hayes, A., Flight, R. S., Melchionna, A. M., Zhou, C., Lee, I. Y., Swan, D., Fox, R., & Anderson, J. T. CHICO2, a two-dimensional pixelated parallel-plate avalanche counter. United States. https://doi.org/10.1016/j.nima.2016.01.034
Wu, C. Y., Cline, D., Hayes, A., Flight, R. S., Melchionna, A. M., Zhou, C., Lee, I. Y., Swan, D., Fox, R., and Anderson, J. T. Wed .
"CHICO2, a two-dimensional pixelated parallel-plate avalanche counter". United States. https://doi.org/10.1016/j.nima.2016.01.034. https://www.osti.gov/servlets/purl/1237583.
@article{osti_1237583,
title = {CHICO2, a two-dimensional pixelated parallel-plate avalanche counter},
author = {Wu, C. Y. and Cline, D. and Hayes, A. and Flight, R. S. and Melchionna, A. M. and Zhou, C. and Lee, I. Y. and Swan, D. and Fox, R. and Anderson, J. T.},
abstractNote = {CHICO2 (Compact Heavy Ion COunter), is a large solid-angle, charged-particle detector array developed to provide both θ and Φ angle resolutions matching those of GRETINA (Gamma-Ray Energy Tracking In-beam Nuclear Array). CHICO2 was successfully tested at the Argonne National Laboratory where it was fielded as an auxiliary detector with GRETINA for γ-ray spectroscopic studies of nuclei using a 252Cf spontaneous fission source, stable beams, and radioactive beams from CARIBU. In field tests of the 72,76Ge beams on a 0.5 mg/cm2208Pb target at the sub-barrier energy, CHICO2 provided charged-particle angle resolutions (FWHM) of 1.55° in θ and 2.47° in Φ. This achieves the design goal for both coordinates assuming a beam-spot size (>3 mm) and the target thickness (>0.5 mg/cm 2). The combined angular resolution of GRETINA/CHICO2 resulted in a Doppler-shift corrected energy resolution of 0.60% for 1 MeV coincident de-excitation γ-rays. This is nearly a factor of two improvements in resolution and sensitivity compared to Gammasphere/CHICO. Kinematically-coincident detection of scattered ions by CHICO2 still maintains the mass resolution (ΔM/M) of ~5% that enhanced isolation of scattered weak beams of interest from scattered contaminant beams.},
doi = {10.1016/j.nima.2016.01.034},
journal = {Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment},
number = ,
volume = 814,
place = {United States},
year = {Wed Jan 27 00:00:00 EST 2016},
month = {Wed Jan 27 00:00:00 EST 2016}
}
Web of Science
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