Oak Ridge SNS
Injection/Extraction Kicker Machine Protection System
Introduction
Goal:- Minimize beam loss and protect target during higher beam power operation
- Monitor pulses occurring at 60Hz for proper duration and shape
- Trigger protection measures if a pulse does not fall within specified tolerances, before the next pulse occurs in 16.67ms (60Hz)
- No missed pulses
- Allow easy remote control and configuration for technicians using EPICS
- Allow simultaneous instrument monitoring from multiple locations using EPICS
Proposed Solution
Use ZTEC Instruments’ LAN-based oscilloscopes with an embedded EPICS controller for easier EPICS integration and faster processing- Embedded XScale processor running Linux
- Runs EPICS 3.14 and Channel Access Client version 4.11
- Stores EPICS process variables (PVs) in onboard memory
- PVs support all scope functions
- Manages LAN services
- Faster processing than Windows-based oscilloscopes
- Onboard DSP
- Automatically generate upper and lower masks based on a captured “golden” waveform
- Compare acquired waveforms to upper/lower masks
- Timing FPGA
- Generate an output pulse if acquired waveform falls within allowed range
- Many EPICS oscilloscope models, each with two and four input channel versions
- Four reference waveforms
- Store upper and lower waveform masks for mask testing
- Four waveform calculation channels
- Compares captured waveform to upper and lower waveform masks
- Stores last failed waveform
Results
- Supports 60 Hz injection and extraction kicker pulses with no missed pulses during continuous operation
- Uses segmented acquisition memory to save the failed and pre-failure waveforms for later review
- Allows gating so that the mask is only applied to a portion of the waveform (e.g., only the rising edge and the top of the pulse)
- Optimizes interaction with the SNS Machine Protection System circuitry using a user-defined output pulse width
- Boots up into a predefined state for hands-off remote deployment
- Requires less rack space than benchtop oscilloscopes (1U height, half rack width)
- Easily integrates using the existing EDM panels
