Short High Charge Bunches in the SLAC Linac

Technical Report · Wed Aug 23 00:00:00 EDT 2000

DOI:https://doi.org/10.2172/763846· OSTI ID:763846

Decker, Franz-Josef ^[1]

---

1. SLAC

These days the linac at the Stanford Linear Accelerator Center (SLAC) is mainly an injector for the PEP-II rings. But besides the electrons and positrons for PEP-II, it provides a 30 GeV electron or positron beam to the end of the linac into the FFTB (Final Focus Test Beam) area or creates a test beam for the A-Line. In the FFTB tunnel there are two plasma experiments installed, which have demonstrated plasma focusing and plasma acceleration up to 0.5 GeV/m. The acceleration goes linear with the current and is inversely proportional to the square of the bunch length. Therefore the authors are pushing the bunch length to shorter and shorter values adjusting the R{sub 56} in the RTL (Ring-To-Linac) compression section and precompressing the bunches in the damping ring. The nonlinearity of the RF and the higher order dispersion are becoming more important for bigger compression factors. Then the high-charge, short bunches will create strong longitudinal wakefields in the linac. They create a double-horned energy profile and have different beam dynamics than a long bunch in the linac. Measurements of the beam properties, like stability, distributions, tails, and backgrounds are discussed in this paper.

• 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: 763846
• Report Number(s): SLAC-PUB-8555
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
BEAM BUNCHING
BEAM DYNAMICS
DAMPING
ELECTRON BEAMS
LINEAR ACCELERATORS
PEP STORAGE RINGS
PLASMA ACCELERATION
POSITRON BEAMS
STABILITY
STANFORD LINEAR ACCELERATOR CENTER