Radiation dosages for NbFeB magnets in CBETA (CBETA Tech Note 040)
- Cornell Univ., Ithaca, NY (United States)
- Brookhaven National Lab. (BNL), Upton, NY (United States). Collider-Accelerator Dept.
This paper creates models of various components of CBETA and conducts simulations of electron beam irradiation to calculate dose rates on NdFeB permanent magnets. Using Geant4 simulation software, two models were created which red 42MeV beams and measured the resulting dosage of radiation on nearby permanent magnets. In the first model, the beam was incident on a viewscreen, and the maximum dose rate obtained on a nearby magnet was .97±.0007 Gy/μC which corresponds to 1910±3 hrs of continuous operation at a beam current of 150 pA, if the maximum allowed dose is 1 kGy. The second model is of a splitter section, and the results indicate that radiation dose rate increases as a function of the incident angle as the beam enters the 42MeV chamber line. In Model II, a half-quadrupole magnet experienced the highest dose rate at 0.0909±.0005 Gy/μC, corresponding to 20,400±140 hrs of operation at 150 pA until the magnet reaches a dose of 1 kGy. For this second model, it was also observed that vertical momenta proportionally decrease radiation dosage on the magnets.
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Nuclear Physics (NP); New York State Energy Research and Development Authority (NYSERDA), Albany, NY (United States)
- DOE Contract Number:
- SC0012704
- OSTI ID:
- 1524534
- Report Number(s):
- CBETA/040; BNL-211714-2019-TECH
- Country of Publication:
- United States
- Language:
- English
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