SLS Operation Statistics

The following picture shows the main figures of the operation statistics for the SLS. More detailed information can be found in the yearly operation reports.
slsop statistics.png
User Operation is the total time when the machine has been scheduled for users (User-Time). Our target is to deliver around 5000 hours per year for User Operation. The Availability is the percentage of the user time where beam was delivered. The Mean Time Between Failures (MTBF) is the average time between two beam losses.
Here are our definitions:
  • Downtime: time between beam loss (Ibeam < 20mA) and full recovery (Ibeam >= Inominal = 400 mA).
  • Short-uptime-rule: if two beam outages have less than 1 hour of uptime in between, it is counted as one long downtime.
  • Scheduled-user-time: this time is distributed between the accepted user proposals
  • Scheduled-user-reserve-time: additional user time, provided to compensate beam outages (introduced 2004)
  • User-Time: Scheduled-user-time + Scheduled-user-reserve-time
  • Delivered-beam-time: User-Time - Downtime
  • Total-downtime: Sum over all individual Downtime of one year
  • Number-of-faults: Count of all individual Downtimes
  • Number-of-distortion = Incidence count of Downtimes, beam drops and orbit feedback failures
  • Availability: Delivered-beam-time / User-Time.
  • Availability after compensation: Delivered-beam-time / Scheduled-user-time.
  • MTBF: Mean Time Between Failures = User-Time / (Number-of-faults + 1)
  • MTTR: Mean Time To Recover = Total-downtime / Number-of-faults
  • MTBD: Mean Time Between Distortions = User Time / Number-of-distortion
The tables below show the detailed statistics for the operation of the SLS in the past years.

Beam Time Statistics 2011 2012 2013 2014 2015 2016 2017
Swiss Light Source [h] [%] [h] [%] [h] [%] [h] [%] [h] [%] [h] [%] [h] [%]
o total beam time 6824 77.9 6928 78.9 6904 78.8 6888 78.6 6872 78.4 6864 78.1 6784 77.4
 + user operation 5000 57.1 4968 56.6 5032 57.4 4984 56.9 5056 57.7 5016 57.1 5048 57.6
    - incl. compensation time 160 1.8 160 1.8 216 2.5 160 1.8 160 1.8 160 1.8 184 2.1
 + beamline commissioning 976 11.1 968 11.0 816 9.3 832 9.5 728 8.3 800 9.1 792 9.0
 + setup & beam development 848 9.7 992 11.3 1056 12.1 1072 12.2 1088 12.4 1048 11.9 944 10.8
o shutdown 1936 22.2 1856 21.2 1856 21.3 1872 21.5 1888 21.6 1920 21.9 1976 22.9
o downtimes at user operation 53 59 66 37 46 25
 + unscheduled outage 65 h 1.3% 63 h 1.3% 186 h 3.7% 123 h 2.5% 49 h 1.0% 45 h 0.9%
 + injector outage (non top-up) 22 h 0.4% 22 h 0.5% 27 h 0.5% 10 h 0.2% 11 h 0.2% 1 h 0.0%
Total beam integral 2506 Ah 2369 Ah 2447 Ah 2455 Ah 2497 Ah 2497 Ah
Availability 98.7% 98.7% 96.3% 97.5% 99.0% 99.1%
Availability after Compensation 101.9% 102.0% 100.6% 100.8% 102.3% 102.4%
MTBF 94.3 h 84.2 h 75.1 h 131.2 h 107.6 h 193.0 h
MTTR 1.2 h 1.1 h 2.8 h 3.3 h 1.1 h 1.8 h
MTBD 38 h 37 h 24 h 55 h 35 h 67 h