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.

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 2015 2016 2017 2018 2019 2020 2021
Swiss Light Source [h] [%] [h] [%] [h] [%] [h] [%] [h] [%] [h] [%] [h] [%]
o total beam time 6872 78.4 6864 78.1 6784 77.4 6824 77.9 6736 76.9 6336 72.1 6688 76.3
 + user operation 5056 57.7 5016 57.1 5048 57.6 5144 58.7 5056 57.7 4672 53.2 5008 57.2
    - incl. compensation time 160 1.8 160 1.8 184 2.1 160 1.8 160 1.8 144 1.6 144 1.6
 + beamline commissioning 728 8.3 800 9.1 792 9.0 840 9.6 760 8.7 760 8.7 728 8.3
 + setup & beam development 1088 12.4 1048 11.9 944 10.8 840 9.6 920 10.5 904 10.3 952 10.9
o shutdown 1888 21.6 1920 21.9 1976 22.9 1936 22.1 2024 23.1 2448 27.9 2072 23.7
o downtimes at user operation 46 25 30 44 32 39  
 + unscheduled outage 49 h 1.0% 45 h 0.9% 63 h 1.3% 49 h 0.9% 42 h 0.8% 96 h 2.1%    
 + injector outage (non top-up) 11 h 0.2% 1 h 0.0% 1 h 0.0% 3 h 0.1% 6 h 0.1% 26 h 0.6%    
Total beam integral 2497 Ah 2497 Ah 2528 Ah 2560 Ah 2512 Ah 2315 Ah  
Availability 99.0% 99.1% 98.7% 99.1% 99.2% 98.0%  
Availability after Compensation 102.3% 102.4% 102.5% 102.2% 102.4% 101.1%  
MTBF 107.6 h 193.0 h 162.8 h 114.3 h 153.2 h 116.3 h  
MTTR 1.1 h 1.8 h 2.1 h 1.1 h 1.3 h 2.5 h  
MTBD 35 h 67 h 42 h 59 h 31 h 26 h