Beam position monitoring

Shafer, Robert E.

doi:10.1063/1.41980

Cited by 89 publications

(34 citation statements)

References 23 publications

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“…The design choice was a log-ratio system with the subtraction function being done in software. The basic expression for the log-ratio beam position [3,4] is:…”

Section: System Designmentioning

confidence: 99%

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New Beam Position Monitor System Design for the APS Injector

Lill¹,

Singh²,

Arnold³

2002

AIP Conference Proceedings

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Abstract. Demands on the APS injector have evolved over the last few years to the point that an upgrade to the existing beam position monitor (BPM) electronics is required. The injector is presently being used as a source for both the low-energy undulator test line (LEUTL) project and the top-up mode of operation. These new requirements and the fact that many new rf receiver components are available at reasonable cost make this upgrade very desirable at this time. The receiver topology selected is a logarithmic processor, which is designed around the Analog Devices AD8313 log amplifier demodulation chip. This receiver will become the universal replacement for all injector applications measuring positions signals from 352 to 2856 MHz with minimum changes in hardware and without the use of a downconverter. The receiver design features integrated front-end gain and built-in self test. The data acquisition being considered at this time is a 100-MHz, 12-bit transient recorder digitizer. The latest experimental and commissioning data and results will be presented.

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“…The design choice was a log-ratio system with the subtraction function being done in software. The basic expression for the log-ratio beam position [3,4] is:…”

Section: System Designmentioning

confidence: 99%

“…This partitioning allows the use of most of the components for operation at either 352 MHz or 2856 MHz. The stripline sensitivity and system calibration factor can be calculated by the following equations [3,4]:…”

Section: System Designmentioning

confidence: 99%

New Beam Position Monitor System Design for the APS Injector

Lill¹,

Singh²,

Arnold³

2002

AIP Conference Proceedings

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“…This non-linearity may be corrected by digital processing [56], using the mapped response of the BPM.…”

Section: Cryostat Assemblymentioning

confidence: 99%

Configuration Manual Polarized Proton Collider at Rhic.

Alekseev¹

2001

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“…Must measure the beam X or Y orbit position up to 20 ± mm off center. 4. The minimum dynamic range should be 45 dB.…”

Section: Requirementsmentioning

confidence: 99%

The Logarithmic Beam Position Monitor

Medvedko¹

2000

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Abstract. Modern logarithmic amplifiers offer wide dynamic range, high bandwidth, good logarithmic conformance, and low cost making them attractive for beam position measurements. A log-ratio beam position monitor has been designed and built at SLAC for use at the PEP-II BFactory. An integrated circuit logarithmic amplifier from Analog Devices, the AD8307, recovers the envelope of the 476 MHz harmonic of the beam signal. A log BPM board with two logarithmic and one differential amplifier performs the basic function of forming an output voltage proportional to the difference of the logarithms of the signal amplitudes on opposite electrodes. This voltage is approximately linear with beam position. For this application, we have limited the video bandwidth of the log amps to 50 kHz in order to remove fill pattern dependence. The log BPM board has an interface for testing and simulating beam offsets. The log BPM's were developed for a PEP-II ring protection chassis. Here the log BPM's function to identify dangerous orbit excursions. These excursions are signaled to a system, which can dump the beam. Two such chassis serve to protect the PEP-II rings.

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Beam position monitoring

Cited by 89 publications

References 23 publications

New Beam Position Monitor System Design for the APS Injector

New Beam Position Monitor System Design for the APS Injector

Configuration Manual Polarized Proton Collider at Rhic.

The Logarithmic Beam Position Monitor

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