The NLC L-Band Bunch Compressor

Technical Report · Wed Aug 21 04:00:00 EDT 2002

DOI:https://doi.org/10.2172/800075· OSTI ID:800075

Emma, Paul J ^[1]

---

1. SLAC

The first stage bunch compressor in the NLC injector complex compresses the e+/e- beams from a bunch length of 5 mm rms to 0.5 mm rms at the beam energy of 2 GeV. To obtain this compression ratio, the compressor rf section operates with an rf frequency of 1.4 GHz and a voltage of about 140 MV while a magnetic wiggler is used to generate an R{sub 56} = 0.5 m. The bunch compressor is designed to operate with a beam from the damping ring that has a bunch spacing slew of 20ps across the bunch train due to the transient loading in the damping rings. The compressor RF section is required to produce a specific energy profile along the bunch train so that the bunch spacing can be corrected in the compressor bending section. Further, the 1-amp beam heavily loads the compressor linac and beam loading compensation is essential to prevent a phase variation along the bunch train in the downstream linacs. In this paper, we will present simulation results of the beam loading compensation using a {Delta}T scheme assuming various initial bunch spacing arrangements. We will study the impact of the different compressor energy profiles on the beam energy, energy spread, and bunch length at the IP.

• Research Organization: Stanford Linear Accelerator Center, Menlo Park, CA (US)
• Sponsoring Organization: USDOE Office of Energy Research (ER) (US)
• DOE Contract Number: AC03-76SF00515
• OSTI ID: 800075
• Report Number(s): SLAC-PUB-9457
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
BENDING
COMPRESSION RATIO
COMPRESSORS
DAMPING
LINEAR ACCELERATORS
SIMULATION
TRANSIENTS