Beam diagnostics at TRIUMF

Rawnsley, W.R.

doi:10.1063/1.48063

Cited by 4 publications

(2 citation statements)

References 8 publications

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“…Thus, a number of electronic modifications for improving the high frequency response were investigated. Some of the modifications adopted were similar to those used in probes that also required nanosecond temporal resolution, but are used for different applications [24,25].…”

Section: Resultsmentioning

confidence: 99%

Fast Faraday cup to measure neutralized drift compression in intense ion charge bunches

Sefkow

Davidson

Efthimion

et al. 2006

Phys. Rev. ST Accel. Beams

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Heavy ion drivers for heavy ion fusion and high energy density physics applications use space-chargedominated ion beams which must undergo longitudinal bunch compression in order to meet the requisite beam intensities desired at the target. The Neutralized Drift Compression Experiment-1A (NDCX-1A) at Lawrence Berkeley National Laboratory is used to determine the effective limits of neutralized drift compression, which occurs due to an imposed longitudinal velocity tilt on the drifting beam and subsequent neutralization of the beam's space charge with background plasma. The accurate and temporally resolved measurement of the ion beam's current and pulse length, which has been longitudinally compressed to a few nanoseconds duration at its focal plane, is a critical diagnostic. This paper describes the design and experimental results for a fast and accurate ion beam probe, which reliably measures the absolute beam current in the presence of high density plasma at the focal plane as a function of time. A particle-in-cell code has been used to model the propagation of the intense ion beam and to design the diagnostic probe.

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Section: Resultsmentioning

confidence: 99%

Fast Faraday cup to measure neutralized drift compression in intense ion charge bunches

Sefkow

Davidson

Efthimion

et al. 2006

Phys. Rev. ST Accel. Beams

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“…The capacitive probe consists of a cylindrical pickup with about 20 pF of stray capacitance to ground and an external inductor which is tapped at its 50 : point to provide a signal output [2]. There is a pulser in the ion source which can vary the beam's duty cycle between 0.1 and 99.2%.…”

Section: Beam Propertiesmentioning

confidence: 99%

Wide Dynamic Range Front-end Electronics for Beam Current and Position Measurement

Rawnsley¹,

Potter²,

Verzilov³

et al. 2006

AIP Conference Proceedings

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An Analog Devices log detector, AD8306, and a Digital Signal Processor (DSP), ADSP-21992, have been found useful for building wide dynamic range, accurate and inexpensive front-end electronics to measure and process the RF signals from TRIUMF's beam monitors. The high-precision log detector has a useful dynamic range of over 100 dB. The 160 MHz mixed-signal DSP is used to digitize the log detector output, linearize it via a lookup table, perform temperature compensation, and remove the variable duty cycle 1 kHz pulse structure of the beam. This approach has been applied to two types of devices in a 500 MeV proton beamline. The 0.1% DC to CW total current monitor is based on a capacitive pickup resonant at 46.11 MHz, the second harmonic of the bunch frequency. The DSP software provides low pass filtering, calculates the antilog of the data and passes the output to a CAMAC input register. The BPM electronics process data from inductive pickup loops. The DSP controls a GaAs switch which multiplexes signals from four adjacent pickups to a single log detector. The DSP performs difference-over-sum or log-ratio data analysis along with averaging over an arbitrary number of samples.

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Simple “Package Design” Ion Chamber Monitors for TRIUMF’s Proton Beamlines

Gray¹,

Minato²

2002

AIP Conference Proceedings

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Beam diagnostics at TRIUMF

Cited by 4 publications

References 8 publications

Fast Faraday cup to measure neutralized drift compression in intense ion charge bunches

Fast Faraday cup to measure neutralized drift compression in intense ion charge bunches

Wide Dynamic Range Front-end Electronics for Beam Current and Position Measurement

Simple “Package Design” Ion Chamber Monitors for TRIUMF’s Proton Beamlines

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