Beam Commissioning Results from the CBETA Fractional Arc Test (CBETA Note 030)

Technical Report · Wed Apr 10 00:00:00 EDT 2019

DOI:https://doi.org/10.2172/1524533· OSTI ID:1524533

Gulliford, Colwyn ^[1]; Peggs, Stephen ^[2]; Banerjee, N. ^[1]; Bartnik, A. ^[1]; Crittenden, J. ^[1]; Dobbins, J. ^[1]; Hoffstaetter, G. H. ^[1]; Lou, W. ^[1]; Quigley, P. ^[1]; Sagan, D. ^[1]; Smolenski, K. ^[1]; Vesherevich, V. ^[1]; Widger, D. ^[1]; Berg, J. S. ^[2]; Hulsart, R. ^[2]; Michnoff, R. ^[2]; Trbojevic, D. ^[2]; Kuske, B. ^[3]; McAteer, M. ^[3]; Voelker, J. ^[3] ; Jones, J. ^[4]; Kelliher, D. J. ^[5]

---

1. Cornell Univ., Ithaca, NY (United States). Lab. for Accelerator Based Sciences and Education
2. Brookhaven National Lab. (BNL), Upton, NY (United States). Collider-Accelerator Dept.
3. Helmholtz-Zentrum Berlin (HZB), (Germany). Inst. for Accelerator Physics
4. Science and Technology Facilities Council (STFC), Daresbury (United Kingdom). Daresbury Lab.
5. Science and Technology Facilities Council (STFC), Oxford (United Kingdom). Rutherford Appleton Lab.

This work describes first commissioning results from the Cornell Brookhaven ERL Test Accelerator fractional arc test. These include the recommissioning of the Cornell photoinjector, the first full energy operation of the main linac with beam, as well as commissioning of the lowest energy matching beamline (splitter) and a partial section of the Fixed Field Alternating gradient (FFA) return loop featuring first production Halbach style permanent magnets. Achieving these tasks required characterization of the injection beam, calibration and phasing of the main linac cavities, demonstration of the required 36 MeV energy gain, and measurement of the splitter line horizontal dispersion and R₅₆ at the nominal 42 MeV. In addition, a procedure for determining the BPM offsets, as well as the tune per cell in the FFA section via scanning the linac energy and inducing betatron oscillations around the periodic orbit in the fractional arc was developed and tested. A detailed comparison of these measurements to simulation is discussed.

• 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: 1524533
• Report Number(s): CBETA/039; BNL-211713-2019-TECH
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS