A bunch clock for the Advanced Photon Source

Lenkszus, F.; Laird, R.

doi:10.1109/pac.1997.751250

Cited by 5 publications

(4 citation statements)

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“…We found no missed or skipped injection pulses in several hours of testing and measured the jitter in time to be 60 ms in a one-hour measurement [3]. This jitter is consistent with the 60-Hz line frequency drift.…”

Section: Top-up Operationsupporting

confidence: 71%

Progress towards top-up mode operations at the Advanced Photon Source

Emery¹,

Borland²

2000

AIP Conference Proceedings

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Abstract.The Advanced Photon Source (APS) is a 7-GeV, thwd-generation synchrotrons radiation source. To provide a more stable beam for users, in September 1998 we began commissioning a new operating mode called "top-up." In this mode, the beam current does not decay but is maintained at a high level using fkequent injection, while photon shutters are open and photon beams are delivered to users. The exhaustive analysis for top-up safety will be reviewed as well as the hardware and softwaxe required for top-up operation. Operational experience so far includes testing aspects of top-up injection, delivering beam to X-ray users for a few hours with fractional current stability of 0.001, and routinely providing beam to users by refilling the ring to 100 mA every 12 hours with shutters open. Top-up performance issues encountered are shortlived orbit and emittance transients during the injection event, which appear in user experiments as X-ray beam brightness dips. Planned system modifications to reduce these beam transients are described. The main operational issue left for continuous top-up injection will then be shaxing the injector system with other operations.

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Section: Top-up Operationsupporting

confidence: 71%

Progress towards top-up mode operations at the Advanced Photon Source

Emery¹,

Borland²

2000

AIP Conference Proceedings

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“…APS RF Clock Input: The 352 MHz ring clock comes from a bunch clock generator LVDS output from a VME crate [17]. This is fed into the FPGA through the clock pins on a XM105 Debug card.…”

Section: B Fpga Firmwarementioning

confidence: 99%

An FPGA-based Timing and Control System for the Dynamic Compression Sector

Saxena,

Paskvan,

Weir

et al. 2021

Preprint

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A field programmable gate array (FPGA) based timing and trigger control system has been developed for the Dynamic Compression Sector (DCS) user facility located at the Advanced Photon Source (APS) at Argonne National Laboratory. The DCS is a first-of-its-kind capability dedicated to dynamic compression science. All components of the DCS laser shock station-x-ray choppers, single-shot shutter, internal laser triggers, and shot diagnostics-must be synchronized with respect to the arrival of x-rays in the hutch. A field-programmable gate array (FPGA) synchronized to the APS storage ring radio frequency (RF) clock (352 MHz) generates trigger signals for each stage of the laser and x-ray shutter system with low jitter. The system is composed of a Zynq FPGA, a debug card, line drivers and power supply. The delay and offsets of trigger signals can be adjusted using a user-friendly graphical user interface (GUI) with high precision. The details of the system architecture, timing requirements, firmware, and software implementation along with the performance evaluation are presented in this paper. The system offers low timing jitter (15.5 ps r.m.s.) with respect to APS 352 MHz clock , suitable for the 50 ps r.m.s. x-ray bunch duration at the APS.

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“…A Bunch Clock Generator was designed 6 to meet the needs of the timing experiments. The APS storage ring operates the rf at 352 MHz.…”

Section: High Precision X-ray Timing Distributionmentioning

confidence: 99%

An overview of the information distribution system at the Advanced Photon Source

Ramanathan

Smith

Arnold

et al. 2002

Review of Scientific Instruments

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The Advanced Photon Source ͑APS͒ has been in operational mode for more than 5 yr. Currently there are over 40 beamlines in various phases of operation. The control system of choice at the APS is the Experimental Physics and Industrial Control System ͑EPICS͒. We have provided various interfaces to the beamlines from the APS control system. An overview of the various systems will be discussed. The General Control System Information ͑GCSI͒ uses dedicated computers as EPICS process variable gateways to provide data from the APS control system to each beamline. The GCSI architecture makes the APS control system secure, yet has the flexibility of providing access control to any data available on the APS control system. In addition, the gateway reduces the load on the APS control system equipment by making only one connection for each process variable accessed by multiple users. Each sector, consisting of a bending magnet and insertion device beamlines, is provided its own gateway, which resides on the local sector network. This scheme has the advantage of providing network security and more reliable operation. To provide real-time accelerator data to beamlines, each sector has been provided a chassis to display the storage ring current and other relevant information. These data are transmitted via a direct fiber link from the APS control system hardware to the beamlines. The beamlines are also provided VME-based hardware and associated EPICS software to retrieve key information provided via this fiber link. Some of the information on this link is beam current, lifetime, injection status, and sector specific information such as shutter status, insertion device gap, and energy, and storage ring and front-end beam position monitor signals. The data rates on this link are typically 10 Hz but can be as high as 272 kHz. This scheme allows the beamlines using EPICS-based software to seamlessly use the data from the APS control system without excessively impacting the system. For high-precision x-ray timing experiments, a new scheme has been designed to distribute the radio-frequency timing signals to the beamlines. Using VME-based hardware and EPICS software, the bunch clock signal is generated at the beamline for use in timing experiments. Data are provided at the radio frequency of 352 MHz. Beamlines have also been provided with hardware and software to generate the bunch clock signal for timing experiments.

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A bunch clock for the Advanced Photon Source

Cited by 5 publications

References 0 publications

Progress towards top-up mode operations at the Advanced Photon Source

Progress towards top-up mode operations at the Advanced Photon Source

An FPGA-based Timing and Control System for the Dynamic Compression Sector

An overview of the information distribution system at the Advanced Photon Source

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