dorsal/arxiv
View SchemaProton Irradiation Experiment for the X-ray Charge-Coupled Devices of the Monitor of All-sky X-ray Image mission onboard the International Space Station: I. Experimental Setup and Measurement of the Charge Transfer Inefficiency
| Authors | E. Miyata, T. Kamazuka, H. Kouno, M. Fukuda M. Mihara, K. Matsuta, H. Tsunemi, K. Tanaka, T Minamisono, H. Tomida, K. Miyaguchi |
|---|---|
| Categories | |
| ArXiv ID | physics/0208090 |
| URL | https://arxiv.org/abs/physics/0208090 |
| DOI | 10.1143/JJAP.41.7542 |
Abstract
We have investigated the radiation damage effects on a CCD to be employed in the Japanese X-ray astronomy mission including the Monitor of All-sky X-ray Image (MAXI) onboard the International Space Station (ISS). Since low energy protons release their energy mainly at the charge transfer channel, resulting a decrease of the charge transfer efficiency, we thus focused on the low energy protons in our experiments. A 171 keV to 3.91 MeV proton beam was irradiated to a given device. We measured the degradation of the charge transfer inefficiency (CTI) as a function of incremental fluence. A 292 keV proton beam degraded the CTI most seriously. Taking into account the proton energy dependence of the CTI, we confirmed that the transfer channel has the lowest radiation tolerance. We have also developed the different device architectures to reduce the radiation damage in orbit. Among them, the ``notch'' CCD, in which the buried channel implant concentration is increased, resulting in a deeper potential well than outside, has three times higher radiation tolerance than that of the normal CCD. We then estimated the charge transfer inefficiency of the CCD in the orbit of ISS, considering the proton energy spectrum. The CTI value is estimated to be 1.1e-5 per each transfer after two years of mission life in the worse case analysis if the highest radiation-tolerant device is employed. This value is well within the acceptable limit and we have confirmed the high radiation-tolerance of CCDs for the MAXI mission.
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"abstract": "We have investigated the radiation damage effects on a CCD to be employed in\nthe Japanese X-ray astronomy mission including the Monitor of All-sky X-ray\nImage (MAXI) onboard the International Space Station (ISS). Since low energy\nprotons release their energy mainly at the charge transfer channel, resulting a\ndecrease of the charge transfer efficiency, we thus focused on the low energy\nprotons in our experiments. A 171 keV to 3.91 MeV proton beam was irradiated to\na given device. We measured the degradation of the charge transfer inefficiency\n(CTI) as a function of incremental fluence. A 292 keV proton beam degraded the\nCTI most seriously. Taking into account the proton energy dependence of the\nCTI, we confirmed that the transfer channel has the lowest radiation tolerance.\nWe have also developed the different device architectures to reduce the\nradiation damage in orbit. Among them, the ``notch\u0027\u0027 CCD, in which the buried\nchannel implant concentration is increased, resulting in a deeper potential\nwell than outside, has three times higher radiation tolerance than that of the\nnormal CCD. We then estimated the charge transfer inefficiency of the CCD in\nthe orbit of ISS, considering the proton energy spectrum. The CTI value is\nestimated to be 1.1e-5 per each transfer after two years of mission life in the\nworse case analysis if the highest radiation-tolerant device is employed. This\nvalue is well within the acceptable limit and we have confirmed the high\nradiation-tolerance of CCDs for the MAXI mission.",
"arxiv_id": "physics/0208090",
"authors": [
"E. Miyata",
"T. Kamazuka",
"H. Kouno",
"M. Fukuda M. Mihara",
"K. Matsuta",
"H. Tsunemi",
"K. Tanaka",
"T Minamisono",
"H. Tomida",
"K. Miyaguchi"
],
"categories": [
"physics.ins-det",
"astro-ph",
"physics.space-ph"
],
"doi": "10.1143/JJAP.41.7542",
"title": "Proton Irradiation Experiment for the X-ray Charge-Coupled Devices of the Monitor of All-sky X-ray Image mission onboard the International Space Station: I. Experimental Setup and Measurement of the Charge Transfer Inefficiency",
"url": "https://arxiv.org/abs/physics/0208090"
},
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