QQ客服 官方微博 反馈留言

	Quantum efficiency calibration for low energy detector onboard hard x-ray modulation telescope satellite
	Zhu-Yue1; Zhang Zi-Liang1; Yang Yan-Ji1; Xue Rong-Feng1,2; Cui Wei-Wei1; Lu Bo1; Wang Juan1; Chen Tian-Xiang1; Wang Yu-Sa1; Li Wei1
刊名	Acta physica sinica
	2017-06-05
卷号	66期号:11页码:8
关键词	Charge-coupled device Quantum efficiency Depletion region
ISSN号	1000-3290
DOI	10.7498/aps.66.112901
通讯作者	Chen yong(ychen@ihep.ac.cn)
英文摘要	Low energy x-ray telescope, working over 0.7-15 kev energy band, is one of the main payloads in the hard x-ray modulation telescope satellite. the primary scientific objectives are to survey large sky area to investigate galactic x-ray transient sources as well as the cosmic x-ray background, and to observe x-ray binaries or black holes for studying the dynamics and emission mechanism in strong gravitational or magnetic field. the detector of low energy x-ray telescope is ccd236, a new generation of swept charge device, which has good time and energy resolution. quantum efficiency (qe) of the detector has a crucial influence on x-ray spectrum fitting and absolute luminosity calculation. to provide valuable scientific data, qe should be calibrated in detail. in this paper, qe calibration is accomplished with respect to a silicon drift detector (sdd), using an fe-55 radioactive source, at energy points mn-k-alpha (5.899 kev) and mn-k-beta (6.497 kev). the energies of mn-k-alpha and mn-k-beta are near that of iron-k, which is an important line in x-ray observation. additionally, mn-k-alpha and mn-k-beta x-ray will partially pass through the depletion region of ccd236, and these energy points can be used to measure the depletion thickness. this experiment is set up in a vacuum cooling chamber. the x-ray source perpendicularly illuminates sdd and ccd236 through a small hole, whose area is far less than those of two detectors; therefore, qe measurements are irrelevant to neither the distance nor the azimuth angle between the x-ray source and the detector. for ccd236, split events should be corrected. energy spectra of sdd and ccd236 are fitted with two gaussian distributions, respectively, to obtain peak positions and standard variations of mn-k-alpha and mn-k-beta. with known structure of sdd, the qe of ccd236 can be calculated. qe values at mn-k-alpha and mn-k-beta are 71% and 62%, respectively. qe and temperature are uncorrelated with each other in a temperature range from -95 degrees c to -30 degrees c. according to the specific structure of ccd236 and the measured qe, without considering the effect of channel stop, the best-fit thickness of depletion region is obtained to be 38 mu m. when ccd236 is applied with different driving or substrate voltages, no obvious variation of qe is observed. it indicates that the thickness values of depletion region with high and low level voltages are equal. furthermore, it shows that working ccd236 is deep depleted, and the thickness of depletion region will not change because it reaches its maximum, the edge of epitaxial layer and substrate layer.
WOS关键词	HXMT SATELLITE ; BOARD ; CCD
WOS研究方向	Physics
WOS类目	Physics, Multidisciplinary
语种	英语
出版者	CHINESE PHYSICAL SOC
WOS记录号	WOS:000403091100007
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2177357
专题	高能物理研究所
通讯作者	Chen Yong
作者单位	1.Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Astrophys, Beijing 100049, Peoples R China 2.Jilin Univ, Dept Radio Phys, Changchun 130012, Peoples R China
推荐引用方式 GB/T 7714	Zhu-Yue,Zhang Zi-Liang,Yang Yan-Ji,et al. Quantum efficiency calibration for low energy detector onboard hard x-ray modulation telescope satellite[J]. Acta physica sinica,2017,66(11):8.
APA	Zhu-Yue.,Zhang Zi-Liang.,Yang Yan-Ji.,Xue Rong-Feng.,Cui Wei-Wei.,...&Chen Yong.(2017).Quantum efficiency calibration for low energy detector onboard hard x-ray modulation telescope satellite.Acta physica sinica,66(11),8.
MLA	Zhu-Yue,et al."Quantum efficiency calibration for low energy detector onboard hard x-ray modulation telescope satellite".Acta physica sinica 66.11(2017):8.

个性服务

查看访问统计

相关权益政策

暂无数据

收藏/分享

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。