The role of space charge in the performance of the bunching system for the ATLAS Positive Ion Injector

Conference · Sat Jul 01 04:00:00 EDT 1995

OSTI ID:93469

Pardo, R C ^[1]; Smith, R ^[2]

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1. Argonne National Lab., IL (United States)
2. Kalamazoo Coll., MI (United States)

The bunching system of the ATLAS Positive Ion Injector consists of a four-frequency harmonic buncher, a beam-tail removing chopper, and a 24.25 MHz spiral resonator sine-wave rebuncher. The system is designed to efficiently create beam pulses of approximately 0.25 nsec FWHM for injection into mid acceleration by the ATLAS superconducting linac. Studies of the effect of space charge on the performance of the system have been undertaken and compared to simulations as part of the design process for a new bunching system to be developed for a second ion source. Results of measurements and modeling studies indicate that the present system suffers significant bunching performance deterioration at beam currents as low as 5 e{mu}A for {sup 238}U{sup 26+} at a velocity of {beta}=0.0085. The low beam current tolerance of the present system is in reasonable agreement with computer simulation. Studies of two alternatives to the present bunching system are discussed and their limitations are explored.

• Research Organization: Argonne National Lab., IL (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 93469
• Report Number(s): ANL/PHY/CP--85354; CONF-950512--226; ON: DE95014207
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ATLAS SUPERCONDUCTING LINAC
BEAM BUNCHERS
BEAM BUNCHING
BEAM INJECTION
DESIGN
PERFORMANCE
SPACE CHARGE