### Abstract

The interactions between high-energy charged particles and spacecraft insulating materials can cause deep dielectric charging and discharging, leading to spacecraft anomalies. In this paper, we establish a unipolar charge transport physical model of deep dielectric charging, according to the charge distribution and energy deposition of incident electrons and nonlinear dark conductivity and radiation induced conductivity (RIC) of material. Under the irradiation of electrons with different energies (from 0.1 to 0.5 MeV), the charge transport process of low density polyethylene (LDPE) can be obtained through solving the charge continuity equation and Poisson's equation. The calculation results show that the maximum electric field decreases with the increase of radiation electron energy. When radiation electron energy is less than 0.3 MeV, the distribution of the maximum electric field is similar to the change of the electron beam density. When the electron beam density is more than 3 × 10^{-9} A/m^{2}, the maximum electric field will be greater than breakdown threshold (about 2 × 10^{7} V/m), and it has higher risk of electrostatic discharge (ESD). With the increase of incident electron energy, the critical electron beam density will increase. When the radiation electron energy is 0.4 MeV, the critical electron beam density is 6 × 10^{-8} A/m^{2}. When the radiation electron energy is more than 0.5 MeV, it seems that no electrostatic discharge (ESD) will occur in a range from 10^{-9} to 10^{-6} A/m^{2}. The physical model has the great significance for further studying deep dielectric charging, evaluating the charged degree of spacecraft in space environment and designing protection devices.

Original language | English |
---|---|

Article number | 059401 |

Journal | Wuli Xuebao/Acta Physica Sinica |

Volume | 62 |

Issue number | 5 |

DOIs | |

Publication status | Published - 2013 Mar 5 |

Externally published | Yes |

### Fingerprint

### Keywords

- Conductivity
- Deep dielectric charging
- High-energy electron radiation
- Low density polyethylene (LDPE)

### ASJC Scopus subject areas

- Physics and Astronomy(all)

### Cite this

*Wuli Xuebao/Acta Physica Sinica*,

*62*(5), [059401]. https://doi.org/10.7498/aps.62.059401

**Influence of radiation electron energy on deep dielectric charging characteristics of low density polyethylene.** / Li, Sheng Tao; Li, Guo Chang; Min, Dao Min; Zhao, Ni.

Research output: Contribution to journal › Article

*Wuli Xuebao/Acta Physica Sinica*, vol. 62, no. 5, 059401. https://doi.org/10.7498/aps.62.059401

}

TY - JOUR

T1 - Influence of radiation electron energy on deep dielectric charging characteristics of low density polyethylene

AU - Li, Sheng Tao

AU - Li, Guo Chang

AU - Min, Dao Min

AU - Zhao, Ni

PY - 2013/3/5

Y1 - 2013/3/5

N2 - The interactions between high-energy charged particles and spacecraft insulating materials can cause deep dielectric charging and discharging, leading to spacecraft anomalies. In this paper, we establish a unipolar charge transport physical model of deep dielectric charging, according to the charge distribution and energy deposition of incident electrons and nonlinear dark conductivity and radiation induced conductivity (RIC) of material. Under the irradiation of electrons with different energies (from 0.1 to 0.5 MeV), the charge transport process of low density polyethylene (LDPE) can be obtained through solving the charge continuity equation and Poisson's equation. The calculation results show that the maximum electric field decreases with the increase of radiation electron energy. When radiation electron energy is less than 0.3 MeV, the distribution of the maximum electric field is similar to the change of the electron beam density. When the electron beam density is more than 3 × 10-9 A/m2, the maximum electric field will be greater than breakdown threshold (about 2 × 107 V/m), and it has higher risk of electrostatic discharge (ESD). With the increase of incident electron energy, the critical electron beam density will increase. When the radiation electron energy is 0.4 MeV, the critical electron beam density is 6 × 10-8 A/m2. When the radiation electron energy is more than 0.5 MeV, it seems that no electrostatic discharge (ESD) will occur in a range from 10-9 to 10-6 A/m2. The physical model has the great significance for further studying deep dielectric charging, evaluating the charged degree of spacecraft in space environment and designing protection devices.

AB - The interactions between high-energy charged particles and spacecraft insulating materials can cause deep dielectric charging and discharging, leading to spacecraft anomalies. In this paper, we establish a unipolar charge transport physical model of deep dielectric charging, according to the charge distribution and energy deposition of incident electrons and nonlinear dark conductivity and radiation induced conductivity (RIC) of material. Under the irradiation of electrons with different energies (from 0.1 to 0.5 MeV), the charge transport process of low density polyethylene (LDPE) can be obtained through solving the charge continuity equation and Poisson's equation. The calculation results show that the maximum electric field decreases with the increase of radiation electron energy. When radiation electron energy is less than 0.3 MeV, the distribution of the maximum electric field is similar to the change of the electron beam density. When the electron beam density is more than 3 × 10-9 A/m2, the maximum electric field will be greater than breakdown threshold (about 2 × 107 V/m), and it has higher risk of electrostatic discharge (ESD). With the increase of incident electron energy, the critical electron beam density will increase. When the radiation electron energy is 0.4 MeV, the critical electron beam density is 6 × 10-8 A/m2. When the radiation electron energy is more than 0.5 MeV, it seems that no electrostatic discharge (ESD) will occur in a range from 10-9 to 10-6 A/m2. The physical model has the great significance for further studying deep dielectric charging, evaluating the charged degree of spacecraft in space environment and designing protection devices.

KW - Conductivity

KW - Deep dielectric charging

KW - High-energy electron radiation

KW - Low density polyethylene (LDPE)

UR - http://www.scopus.com/inward/record.url?scp=84875592579&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84875592579&partnerID=8YFLogxK

U2 - 10.7498/aps.62.059401

DO - 10.7498/aps.62.059401

M3 - Article

AN - SCOPUS:84875592579

VL - 62

JO - Wuli Xuebao/Acta Physica Sinica

JF - Wuli Xuebao/Acta Physica Sinica

SN - 1000-3290

IS - 5

M1 - 059401

ER -