Difference between revisions of "CIS OnCall and Troubleshooting"
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| + | == 250V FSD Comparator Faults == | ||
| + | : Use comparator circuit in ISB monitoring HVPS output to determine gun voltage is within a window | ||
| + | # Faults can be real (gun HV is out of range) or false (comparator is drifting) | ||
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| + | '''Gun HV bad - are the following drifting ...''' | ||
| + | Check archived precision read back of Ross probe | ||
| + | Check archived HVPS lock set point | ||
| + | Check archived BPM orbit at IPM1I02 | ||
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| + | '''Comparator bad - provided gun HV stable ...''' | ||
| + | Window drift during SAD can be found at startup | ||
| + | Window drift sensitive to temperature variation e.g. seasonal temperature swing | ||
| + | Window set too tightly by Ops | ||
| + | To set window | ||
| + | # While clicking FSD clear button vary POT until resets to find a good region | ||
| + | # High Limit : Increase POT while clicking until fault occurs, then decrease until fault clears and record new high value | ||
| + | # Low Limit : Decrease POT while clicking until fault occurs, then increase until fault clears and record new low value | ||
| + | # Set POT at center of new low and high values; maybe repeat to get consistent values | ||
== Beam Noise == | == Beam Noise == | ||
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# MAC or Channel Access is required | # MAC or Channel Access is required | ||
# Choose a BPM mode and BPM by selecting corresponding ioc e.g. iocse11 | # Choose a BPM mode and BPM by selecting corresponding ioc e.g. iocse11 | ||
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'''BPMSEE mode''' | '''BPMSEE mode''' | ||
Non-invasive | Non-invasive | ||
Revision as of 14:01, 18 March 2015
250V FSD Comparator Faults
- Use comparator circuit in ISB monitoring HVPS output to determine gun voltage is within a window
- Faults can be real (gun HV is out of range) or false (comparator is drifting)
Gun HV bad - are the following drifting ... Check archived precision read back of Ross probe Check archived HVPS lock set point Check archived BPM orbit at IPM1I02
Comparator bad - provided gun HV stable ... Window drift during SAD can be found at startup Window drift sensitive to temperature variation e.g. seasonal temperature swing Window set too tightly by Ops To set window # While clicking FSD clear button vary POT until resets to find a good region # High Limit : Increase POT while clicking until fault occurs, then decrease until fault clears and record new high value # Low Limit : Decrease POT while clicking until fault occurs, then increase until fault clears and record new low value # Set POT at center of new low and high values; maybe repeat to get consistent values
Beam Noise
- Use FastSEE BPM Mode to diagnose intensity and position from injector BPM's with 4 microsecond sampling
- To start : Accel Menubar => EDM => BPM => New FastSEE Control
- MAC or Channel Access is required
- Choose a BPM mode and BPM by selecting corresponding ioc e.g. iocse11
BPMSEE mode Non-invasive BPM spikes update correctly Less samples limit to lower frequency Make sure FastSee Light is ON
FastSEE mode Invasive BPM spikes update erratically More samples for higher frequency ~60kHz