Permanent magnets for the return loop of the Cornell-Brookhaven energy recovery linac test accelerator
214 neodymium permanent magnets have been manufactured for the return loop of the CBETA multi-turn ERL at Cornell University. There are 5 types of quadrupole and combined-function gradient magnets using a variant of the circular Halbach design. These are made out of NdFeB material and glued into an aluminium housing with water channels for temperature stabilisation. The NdFeB wedges and magnet construction were done by outside companies, while the final “tuning” using inserts containing 64 iron rods per magnet was done at BNL over a period of about 6 months. Average relative field errors of 2.2×10-4 were achieved on the beam region. The magnet strengths vary by type but are of order 10 T/m for quadrupole component and up to 0.3 T for the dipole. This paper reports on the field quality and timeline achieved in this production process
- 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)
- Grant/Contract Number:
- SC0012704
- OSTI ID:
- 1717907
- Report Number(s):
- BNL-220644-2020-JAAM; TRN: US2204807
- Journal Information:
- Physical Review Accelerators and Beams, Vol. 23, Issue 11; ISSN 2469-9888
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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