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Title: Modeling radiation loads in the ILC main linac and a novel approach to treat dark current

Abstract

Electromagnetic and hadron showers generated by electrons of dark current (DC) can represent a significant radiation threat to the ILC linac equipment and personnel. In this study, a commissioning scenario is analysed which is considered as the worst-case scenario for the main linac regarding the DC contribution to the radiation environment in the tunnel. A normal operation scenario is analysed as well. An emphasis is made on radiation load to sensitive electronic equipment—cryogenic thermometers inside the cryomodules. Prompt and residual dose rates in the ILC main linac tunnels were also calculated in these new high-statistics runs. A novel approach was developed—as a part of general purpose Monte Carlo code MARS15—to model generation, acceleration and transport of DC electrons in electromagnetic fields inside SRF cavities. Comparisons were made with a standard approach when a set of pre-calculated DC electron trajectories is used, with a proper normalization, as a source for Monte Carlo modelling. Results of MARS15 Monte Carlo calculations, performed for the current main linac tunnel design, reveal that the peak absorbed dose in the cryogenic thermometers in the main tunnel for 20 years of operation is about 0.8 MGy. The calculated contact residual dose on cryomodules and tunnel walls inmore » the main tunnel for typical irradiation and cooling conditions is 0.1 and 0.01 mSv/hr, respectively.« less

Authors:
 [1];  [1];  [1]
  1. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1421532
Report Number(s):
FERMILAB-FN-1035-APC
1655148; TRN: US1900033
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; INTERNATIONAL LINEAR COLLIDER; DARK CURRENT; ABSORBED RADIATION DOSES; ELECTRONIC EQUIPMENT; DOSE RATES

Citation Formats

Mokhov, Nilolai V., Rakhno, Igor L., and Tropin, Igor S. Modeling radiation loads in the ILC main linac and a novel approach to treat dark current. United States: N. p., 2017. Web. doi:10.2172/1421532.
Mokhov, Nilolai V., Rakhno, Igor L., & Tropin, Igor S. Modeling radiation loads in the ILC main linac and a novel approach to treat dark current. United States. doi:10.2172/1421532.
Mokhov, Nilolai V., Rakhno, Igor L., and Tropin, Igor S. Mon . "Modeling radiation loads in the ILC main linac and a novel approach to treat dark current". United States. doi:10.2172/1421532. https://www.osti.gov/servlets/purl/1421532.
@article{osti_1421532,
title = {Modeling radiation loads in the ILC main linac and a novel approach to treat dark current},
author = {Mokhov, Nilolai V. and Rakhno, Igor L. and Tropin, Igor S.},
abstractNote = {Electromagnetic and hadron showers generated by electrons of dark current (DC) can represent a significant radiation threat to the ILC linac equipment and personnel. In this study, a commissioning scenario is analysed which is considered as the worst-case scenario for the main linac regarding the DC contribution to the radiation environment in the tunnel. A normal operation scenario is analysed as well. An emphasis is made on radiation load to sensitive electronic equipment—cryogenic thermometers inside the cryomodules. Prompt and residual dose rates in the ILC main linac tunnels were also calculated in these new high-statistics runs. A novel approach was developed—as a part of general purpose Monte Carlo code MARS15—to model generation, acceleration and transport of DC electrons in electromagnetic fields inside SRF cavities. Comparisons were made with a standard approach when a set of pre-calculated DC electron trajectories is used, with a proper normalization, as a source for Monte Carlo modelling. Results of MARS15 Monte Carlo calculations, performed for the current main linac tunnel design, reveal that the peak absorbed dose in the cryogenic thermometers in the main tunnel for 20 years of operation is about 0.8 MGy. The calculated contact residual dose on cryomodules and tunnel walls in the main tunnel for typical irradiation and cooling conditions is 0.1 and 0.01 mSv/hr, respectively.},
doi = {10.2172/1421532},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2017},
month = {9}
}

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