Development of an n-channel CCD, CCD-NeXT1, for Soft X-ray Imager onboard the NeXT satellite

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dc.creatorTakagi, Shin-ichiro
dc.creatorTsuru, Takeshi Go
dc.creatorInui, Tatsuya
dc.creatorMatsumoto, Hironori
dc.creatorKoyama, Katsuji
dc.creatorOzawa, Hideki
dc.creatorTohiguchi, Masakuni
dc.creatorMatsuura, Daisuke
dc.creatorMiyata, Emi
dc.creatorTsunemi, Hiroshi
dc.creatorMiyaguchi, Kazuhisa
dc.creatorMaeda, Kentaro
dc.creatorKohno, Hirohiko
dc.date2007-10-03
dc.date.accessioned2026-07-07T10:57:34Z
dc.date.available2026-07-07T10:57:34Z
dc.descriptionNeXT (New X-ray Telescope) is the next Japanese X-ray astronomical satellite mission after the Suzaku satellite. NeXT aims to perform wide band imaging spectroscopy. Due to the successful development of a multilayer coated mirror, called a supermirror, NeXT can focus X-rays in the energy range from 0.1 keV up to 80 keV. To cover this wide energy range, we are in the process of developing a hybrid X-ray camera, Wideband X-ray Imager (WXI) as a focal plane detector of the supermirror. The WXI consists of X-ray CCDs (SXI) and CdTe pixelized detectors (HXI), which cover the lower and higher X-ray energy bands of 0.1-80 keV, respectively. The X-ray CCDs of the SXI are stacked above the CdTe pixelized detectors of the HXI. The X-ray CCDs of the SXI detect soft X-rays below $\sim$ 10 keV and allow hard X-rays pass into the CdTe detectors of the HXI without loss. Thus, we have been developing a "back-supportless CCD" with a thick depletion layer, a thinned silicon wafer, and a back-supportless structure. In this paper, we report the development and performances of an evaluation model of CCD for the SXI, "CCD-NeXT1". We successfully fabricated two types of CCD-NeXT1, unthinned CCDs with 625-um thick wafer and 150-um thick thinned CCDs. By omitting the polishing process when making the thinned CCDs, we confirmed that the polishing process does not impact the X-ray performance. In addition, we did not find significant differences in the X-ray performance between the two types of CCDs. The energy resolution and readout noise are $\sim$ 140 eV (FWHM) at 5.9 keV and $\sim$5 electrons (RMS), respectively. The estimated thickness of the depletion layer is $\sim$80 um. The performances almost satisfy the requirements of the baseline plan of the SXI.
dc.description20 pages, 10 figures, Accepted for publication in NIMA
dc.identifierhttps://arxiv.org/abs/0710.0785
dc.identifierhttp://arxiv.org/abs/0710.0785
dc.identifierNucl.Instrum.Meth.A582:546-553,2007
dc.identifierdoi:10.1016/j.nima.2007.08.158
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/186800
dc.subjectAstrophysics
dc.titleDevelopment of an n-channel CCD, CCD-NeXT1, for Soft X-ray Imager onboard the NeXT satellite
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