SLS Timing Master Timo Korhonen, PSI.

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Presentation transcript:

SLS Timing Master Timo Korhonen, PSI

Outline -What is a “Master Pattern Generator” -SLS operation -Possibilities of the SLS/Diamond-type system

Master Pattern Generator generates and distributes data to modify beam operation pulse-by-pulse typically a bit pattern to tell what kind of beam is coming next, where it should go and what devices should trigger in the next cycle in (ring) light sources with a single-purpose injector this is usually not (very much) an issue concept is unknown to many

SLS Operation Single type of operation: inject from linac to booster to storage ring Sequence of events is always the same; pre-programmed with EPICS records Slow changes of mode Top-up, parasitic linac measurements, booster tuning Implemented with EPICS tools, operation synchronized with timing system

SLS Operation Example implementation: top-up When injector is idle, e-gun, kickers and magnet ramps are turned off Ramping starts a few cycles before injection (to warm up the magnets), kickers also a couple of cycles before injection Bucket numbers to fill are sent (well in) advance to the related ioc’s (as waveforms) The cycle is started by master timing ioc sending an “topup-on” event (start e-gun triggers), and stopped with another event. No other data is sent with the events With our cycle time (3 Hz), sending the required data in advance (to not to rely on network response time) and a bit of organization the system works fine No big safety issues

SLS Operation Other sequencing has no big real-time requirements Measurements with linac between injection cycles: drive in a screen monitor, turn on the data acquisition (camera triggers). Reverse procedure when injector needed Real-time data transmission was not a (big) issue for us we had to learn the limitations in CA response, though (like sending a list of bucket numbers in advance)

Pattern generator using the event system For other facilities, the real-time requirements are more strict CA-based approach would not be enough Can the (Diamond) event system be used in a master pattern generator What modifications would need to be done? What kind of software tools would be needed?

Possibilities of real-time data transfer with the event system The APS event system has 8-bit frames for events. For SLS, we (mainly for technical reasons) decided to make the frames 16-bit. However, retained the 8-bit wide event codes for SW compatibility The remaining 8 bits are “free” (although we found use for them – distributing clock signals By modifying the firmware they can be used for data transfer Also the frame size could be changed (64, 128, 256,…bits) This implies a change in the frame rate (events per second) The Diamond event system cards have (for Diamond specs) a frame rate of 125 MHz (with 16-bit events)

Conclusions The hardware should have enough capacity (128 MB/s using the idle channel) Would be good to agree on the data transfer method to avoid too many firmware versions and too many EPICS support versions What kind of software tools are necessary to generate the patterns? For a slow-cycling light source with a dedicated injector, the need is not immediate (but might be, depending on the outcome.)