The design of an automatically-tuned beamline
- The Indiana University Cyclotron Facility, 2401 Milo Sampson Ln., Bloomington, Indiana 47405 (United States)
A new 30 m beamline (BL1C) is being assembled to connect the new High Intensity Polarized Ion Source (HIPIOS) to the IUCF cyclotrons. This line is being instrumented for complete automatic optimization of all transverse and longitudinal ion optical elements by providing a unique feedback signal for each controllable device. Transversely, steerers and 4-quadrant electrostatic pickups are located approximately 90[degree] apart in betatron phase advance along the beamline. Each pickup is instrumented with a single-board, 4-layer op-amp circuit (BPM system) which measures the beam intensity, horizontal (H) and vertical (V) position, and H and V 10 Hz position modulation. The transverse beam ellipse parameters are first automatically determined at the entrance to the beamline by measuring the beam size using a wire scanner as a function of the strength of a quadrupole. The computer then programs the amplitude and phase of four 10 Hz modulators which vary the current in 4 steerers to move the beam centroid around this (reduced area) ellipse in 4-dimensional phase space. The BPM system then outputs voltages proportional to the beam intensity, centroid location, and envelope. Computer algorithms will then set the steerers and quadrupoles to correct the beam position, dispersion, and envelope. Longitudinally, hardware feedback loops, with a bandwidth adjustable from 10 Hz to 30 kHz, will phase-lock the beam to the two bunching systems; another hardware system will automatically vary the buncher amplitudes to compensate for the significant and varying space charge defocusing as the beam current fluctuates. The bunchers' quiescent phases and amplitudes will be optimized using software synchronous detectors.''
- OSTI ID:
- 6614835
- Report Number(s):
- CONF-9310204-; CODEN: APCPCS; TRN: 95-003839
- Journal Information:
- AIP Conference Proceedings (American Institute of Physics); (United States), Vol. 319:1; Conference: Beam instrumentation workshop, Santa Fe, NM (United States), 20-23 Oct 1993; ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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