BPM Analog front-end electronics based on the AD8307 log amplifier
27 Mar 2001-Vol. 546, Iss: 1, pp 581-584
TL;DR: In this paper, the Analog Devices AD8307 logarithmic amplifier was used for beam position monitor (BPM) signal processing at the Low Energy Demonstration Accelerator (LEDA), part of the Accelerator Production of Tritium (APT) project.
Abstract: Beam position monitor (BPM) signal-processing electronics utilizing the Analog Devices AD8307 logarithmic amplifier has been developed for the Low Energy Demonstration Accelerator (LEDA), part of the Accelerator Production of Tritium (APT) project at Los Alamos. The low-pass filtered 350 MHz fundamental signal from each of the four microstrip electrodes in a BPM is “detected” by an AD8307 log amp, amplified and scaled to accommodate the 0 to +5 V input of an analog-to-digital (A/D) converter. The resultant four digitized signals represent a linear power relationship to the electrode signals, which are in turn related to beam current and position. As the AD8307 has a potential dynamic range of approximately 92 dB, much attention must be given to noise reduction, sources of which can be digital signals on the same board, power supplies, inter-channel coupling, stray RF and others. This paper will describe the operational experience of this particular analog front-end electronic circuit design.
Citations
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01 May 2000
TL;DR: The Low Energy Demonstration Accelerator (LEDA) facility has been used to characterize the pulsed- and cw-beam performance of a 6.7 MeV, 100 mA radio frequency quadrupole and the resulting data are reviewed.
Abstract: The Low Energy Demonstration Accelerator (LEDA) facility has been used to characterize the pulsed- and cw-beam performance of a 6.7 MeV, 100 mA radio frequency quadrupole (RFQ). Diagnostic instrumentation, primarily located in a short beam transport downstream of the RFQ, allow facility commissioners and operators to measure and monitor the RFQ’s accelerated and total beam transmission, beam loss, bunched beam current, beam energy and output phase, and beam position. Transverse beam profile measurements are acquired under both low and high duty-factor pulsed beam conditions using a slow wire scanner and a camera that images beam-induced fluorescence. The wire scanner is also used to acquire transverse beam emittance information using a technique known as a “quad scan”. This paper reviews the measurement performance and discusses the resulting data.
15 citations
01 Jun 2000
TL;DR: The LEDA facility has been used to characterize the pulsed- and cw-beam performance of a 6.7-MeV, 100-mA radio frequency quadrupole (RFQ) and some of the resulting data are discussed.
Abstract: The LEDA facility has been used to characterize the pulsed- and cw-beam performance of a 6.7-MeV, 100-mA radio frequency quadrupole (RFQ). Diagnostic instrumentation, primarily located in a short beam transport downstream of the RFQ, allowed facility commissioners and operators to measure and monitor the RFQ's accelerated and total beam transmission, beam loss, bunched beam current, beam energy and output phase, and beam position. Transverse beam profile measurements are acquired under both low and high duty- factor pulsed beam conditions using a slow wire scanner and a camera that images beam-induced fluorescence. The wire scanner is also used to acquire transverse beam emittance information using a technique known as a "quad scan". This paper reviews the measurement performance and discusses some of the resulting data.
13 citations
01 Aug 2000
TL;DR: A 52 quadrupole-magnet FODO lattice is presently being installed in the Low Energy Demonstration Accelerator (LEDA) facility between the radio frequency quadrupoles and a high-energy beam transport (HEBT) as mentioned in this paper.
Abstract: A 52 quadrupole-magnet FODO lattice is presently being installed in the Low Energy Demonstration Accelerator (LEDA) facility between the radio frequency quadrupole (RFQ) and a high-energy beam transport (HEBT) [1]. The purpose of this lattice is to provide a beam transport to measure the formation of beam halo and compare the measured data with halo simulations. To attain this goal, several types of beam-diagnostic instruments are being installed in the magnet lattice. There will be nine beam-profile-measurement stations. Each station will have use of a slow wire scanner to detect the projected-distribution beam core, and a set of graphite or copper scrapers that measures the "tails" of the distribution down to 0.01% of the distribution peak. Also included in the instrumentation suite are ten beam position monitors (BPM), five beam loss monitors (BLM), three pulsed-current toroids, and an energy measurement similar to existing beam instrumentation [2,3]. This paper describes the instruments, initial test data, and their expected performance.
10 citations
27 Nov 2000
TL;DR: In this paper, the operation of the beam position monitor (BPM) at the Low Energy Demonstration Accelerator (LEDA) at Los Alamos National Laboratory (LANL) is discussed.
Abstract: The Low Energy Demonstration Accelerator (LEDA) facility located at Los Alamos National Laboratory (LANL) accelerates protons to an energy of 6.7 MeV and current of 100 mA operating in either a pulsed or cw mode. Of key importance to the commissioning and operations effort is the Beam Position Monitor system (BPM). The LEDA BPM system uses five micro-stripline beam position monitors processed by log ratio processing electronics with data acquisition via a series of custom TMS320C40 Digital Signal Processing (DSP) boards. Of special interest to this paper is the operation of the system, the log ratio processing, and the system calibration technique. This paper will also cover the DSP system operations and their interaction with the main accelerator control system.
8 citations
01 Aug 2000
TL;DR: A 52 quadrupole-magnet FODO lattice is presently being installed in the Low Energy Demonstration Accelerator (LEDA) facility between the radio frequency quadrupoles (RFQ) and a high-energy beam transport (HEBT).
Abstract: A 52 quadrupole-magnet FODO lattice is presently being installed in the Low Energy Demonstration Accelerator (LEDA) facility between the radio frequency quadrupole (RFQ) and a high-energy beam transport (HEBT) [1] The purpose of this lattice is to provide a beam transport to measure the formation of beam halo and compare the measured data with halo simulations To attain this goal, several types of beam-diagnostic instruments are being installed in the magnet lattice There will be nine beam-profile-measurement stations Each station will have use of a slow wire scanner to detect the projected-distribution beam core, and a set of graphite or copper scrapers that measures the "tails" of the distribution down to 001% of the distribution peak Also included in the instrumentation suite are ten beam position monitors (BPM), five beam loss monitors (BLM), three pulsed-current toroids, and an energy measurement similar to existing beam instrumentation [2,3] This paper describes the instruments, initial test data, and their expected performance
7 citations
References
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12 May 1997
TL;DR: In this paper, the beam position and intensity measurement module for the Low Energy Demonstration Accelerator (LEDA) and Accelerator Production of Tritium (APT) projects at Los Alamos National Laboratory is described.
Abstract: This paper describes the specification, design and preliminary operation of the beam-position/intensity measurement module being built for the Low Energy Demonstration Accelerator (LEDA) and Accelerator Production of Tritium (APT) projects at Los Alamos National Laboratory. The module, based on the VXI footprint, is divided into three sections: first, the analog front-end which consists of logarithmic amplifiers, anti-alias filters, and digitizers; second, the digital-to-analog section for monitoring signals on the front panel; and third, the DSP, error correction, and VXI-interface section. Beam position is calculated based on the log-ratio transfer function. The module has four, 2-MHz, IF inputs suitable for two-axis position measurements. It has outputs in both digital and analog format for x- and y-position and beam intensity. Real-time error-correction is performed on the four input signals after they are digitized and before calculating the beam position to compensate for drift, offsets, gain nonlinearities, and other systematic errors. This paper also describes how the on-line error-correction is implemented digitally and algorithmically.
17 citations
01 May 2000
TL;DR: The Low Energy Demonstration Accelerator (LEDA) facility has been used to characterize the pulsed- and cw-beam performance of a 6.7 MeV, 100 mA radio frequency quadrupole and the resulting data are reviewed.
Abstract: The Low Energy Demonstration Accelerator (LEDA) facility has been used to characterize the pulsed- and cw-beam performance of a 6.7 MeV, 100 mA radio frequency quadrupole (RFQ). Diagnostic instrumentation, primarily located in a short beam transport downstream of the RFQ, allow facility commissioners and operators to measure and monitor the RFQ’s accelerated and total beam transmission, beam loss, bunched beam current, beam energy and output phase, and beam position. Transverse beam profile measurements are acquired under both low and high duty-factor pulsed beam conditions using a slow wire scanner and a camera that images beam-induced fluorescence. The wire scanner is also used to acquire transverse beam emittance information using a technique known as a “quad scan”. This paper reviews the measurement performance and discusses the resulting data.
15 citations
31 Dec 1998
TL;DR: In this paper, beam position measurements for a steering scheme within the Accelerator Production of Tritium (APT) linac magnetic lattice are presented, which uses two position measurements and two translatable quadrupole magnets every 5.5-FODO-lattice periods.
Abstract: Beam position measurements are being designed and fabricated for the Low Energy Demonstration Accelerator (LEDA), a 20-MeV, 100-mA-cw proton-accelerator, presently under construction at Los Alamos. Similar position measurements will provide position information for a steering scheme within the Accelerator Production of Tritium (APT) linac magnetic lattice. The steering scheme, which centers the beam in the magnetic lattice, uses two position measurements and two translatable quadrupole magnets every 5.5-FODO-lattice periods. What makes these beam position measurements unique is how they will attain, maintain and verify the required accuracy. The position measurement systems consist of micro-stripline beam position monitors (BPMs) and RF coaxial cables, log-ratio processors, on-line error correction sub-systems, and a control system interface including associated algorithms and computer software. This paper discusses the mapping of the BPM probe response, the algorithm used to calculate low beam-velocity response, and the expected log-ratio processor performance.
12 citations
12 May 1997
TL;DR: In this paper, the beam position measurement system for the Low Energy Demonstration Accelerator (LEDA) and the Accelerator Production of Tritium (APT) projects at Los Alamos National Laboratory is described.
Abstract: This paper describes the beam-position measurement system being developed for the Low Energy Demonstration Accelerator (LEDA) and the Accelerator Production of Tritium (APT) projects at Los Alamos National Laboratory. The system consists of a beam-position monitor (BPM) probe, cabling, down-converter module, position/intensity module, on-line error-correction system, and the necessary control system interfaces. The modules are built on the VXI-interface standard and are capable of duplex data transfer with the control system. Some of the key, system parameters are: position-measurement bandwidth of at least 180 kHz, the ability to measure beam intensity, a beam-position measurement accuracy of less than 1.25 percent of the bore radius, a beam-current dynamic range of 46 dB, a total system dynamic range in excess of 75 dB, and built-in on-line digital-system-error correction.
10 citations
27 Nov 2000
TL;DR: In this paper, the operation of the beam position monitor (BPM) at the Low Energy Demonstration Accelerator (LEDA) at Los Alamos National Laboratory (LANL) is discussed.
Abstract: The Low Energy Demonstration Accelerator (LEDA) facility located at Los Alamos National Laboratory (LANL) accelerates protons to an energy of 6.7 MeV and current of 100 mA operating in either a pulsed or cw mode. Of key importance to the commissioning and operations effort is the Beam Position Monitor system (BPM). The LEDA BPM system uses five micro-stripline beam position monitors processed by log ratio processing electronics with data acquisition via a series of custom TMS320C40 Digital Signal Processing (DSP) boards. Of special interest to this paper is the operation of the system, the log ratio processing, and the system calibration technique. This paper will also cover the DSP system operations and their interaction with the main accelerator control system.
8 citations