ttf1/ttf2/xfel/lc stability/reliability stability: fel requests beyond specs. what was measured?...
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TTF1/TTF2/XFEL/LC stability/reliability
Stability: FEL requests beyond specs.
•What was measured?•What needs to be measured•What needs to be compared to simulation•…..
Improving is a learning curve: first steps @ TTF1
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TESLA Test Facility - Operation
week 3 / 2002
FEL User Operation
week 7 / 2002
Accelerator Studies
100%
80%
60%
40%
20%
35 40 45 50 5 10
Beam uptime and operational uptime (users or acc.studies)
The TTF Linac was operated 7 days per week, 24 hours.
Approx. 50% of the time was allocated to FEL operation including a large percentage of user time. The FEL requires very stable beam conditions.
In its different set-ups, approx. 13,000 hours beamtime were achieved since 1997.
Based on the TTF experience several FELs using superconducting accelerator technology are proposed.
2001 2002
week
Courtesy M. Minty
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TTF OPERATIONS STATISTICS
To direct accelerator improvements aimed at increased reliability, the operational statistics at the TTF are now logged on a per-shift basis. Initially these data were compiled to reveal outstanding hardware limitations. As reliability at the TTF continues to improve, correspondingly finer classifications have evolved. In the future, perhaps an automated analysis could be implemented. At present, the TTF operators are requested “to the best of his/hers ability” to classify the time spent during each shift into 1 of 5 categories:
CATEGORIES: USERS - beam delivery for experimental programs using the intense SASE radiation (i.e. ABLO, Cluster, RAFEL) STUDIES - all studies pertaining to accelerator development aimed towards quantification and improvement of beam properties (i.e. CSR, BTM, BBA, etc) and /or demonstrating TESLA-like beam conditions (i.e. high charge, high gradient, long pulses, etc.) TUNING - all time spent with beam providing the required condition for the users or accelerator development DOWN - downtime caused by hardware failure or anything else which prohibits operations OFF - time with no beam arising from transitioning between experiments (e.g. ABLO/CLUSTER ), accelerator improvements, and holidays
Courtesy M. Minty
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4.3.02-10.3.02TTF operations statisticsFocus: rafel,cluster,sfpd
How much of the 53% is really available for users (missing pulses)?
What caused the downtime?
What is the reason for tuning•Different machine-setting•Drift of the machine
More accurate specification of machine status
Courtesy M. Minty
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DOWNTIME SUMMARY SINCE SHUTDOWN (26.11.01-24.3.02): How do problems occur (once or regular)
Courtesy Michiko Minty
laser
gun
Gun vac
CC
Kly3Cryo
Vacuum
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Machine Stability/performance
•What parameters need to be measured (slice?) •SASE, Charge, offset/angle (orbit), energy, phases, losses….
•What parameters need to be correlated•How often do we need to store data (DAQ)
•Slow drifts (tuning), Fast fluctuations (instability)•How flexible do we need to store data• ….. ?
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Modes of operation
•Gun/Injector/Analysis/Linac mode (BIS)•Down/off/user/study/tuning mode (DOOCS panel)
Information availability
With mode definition •All relevant information is available•All important data are saved and easily accessible for data analysis (tools: history plots, correlation)•Statistics is kept for logbook•Leaving a mode stores changes of relevant parameters and plots in the logbook
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Information gathering
How to make sure that operators are in the correct modeWrong mode=wrong information saved
Unknown cause of failure/instabilityGet info from the DAQ (Much work: is it available?)
Flexible DOOCS panels/tools for different modes