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.

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 2013 2014 2015 2016 2017 2018 2019 2020
Swiss Light Source [h] [%] [h] [%] [h] [%] [h] [%] [h] [%] [h] [%] [h] [%] [h] [%]
o total beam time 6904 78.8 6888 78.6 6872 78.4 6864 78.1 6784 77.4 6824 77.9 6736 76.9 6672 76.0
 + user operation 5032 57.4 4984 56.9 5056 57.7 5016 57.1 5048 57.6 5144 58.7 5056 57.7 5000 56.9
    - incl. compensation time 216 2.5 160 1.8 160 1.8 160 1.8 184 2.1 160 1.8 160 1.8 144 1.6
 + beamline commissioning 816 9.3 832 9.5 728 8.3 800 9.1 792 9.0 840 9.6 760 8.7 744 8.5
 + setup & beam development 1056 12.1 1072 12.2 1088 12.4 1048 11.9 944 10.8 840 9.6 920 10.5 928 10.6
o shutdown 1856 21.3 1872 21.5 1888 21.6 1920 21.9 1976 22.9 1936 22.1 2024 23.1 2112 24.0
o downtimes at user operation 66 37 46 25 30 44 32
 + unscheduled outage 186 h 3.7% 123 h 2.5% 49 h 1.0% 45 h 0.9% 63 h 1.3% 49 h 0.9% 42 h 0.8%
 + injector outage (non top-up) 27 h 0.5% 10 h 0.2% 11 h 0.2% 1 h 0.0% 1 h 0.0% 3 h 0.1% 6 h 0.1%
Total beam integral 2447 Ah 2455 Ah 2497 Ah 2497 Ah 2528 Ah 2560 Ah 2512 Ah
Availability 96.3% 97.5% 99.0% 99.1% 98.7% 99.1% 99.2%
Availability after Compensation 100.6% 100.8% 102.3% 102.4% 102.5% 102.2% 102.4%
MTBF 75.1 h 131.2 h 107.6 h 193.0 h 162.8 h 114.3 h 153.2 h
MTTR 2.8 h 3.3 h 1.1 h 1.8 h 2.1 h 1.1 h 1.3 h
MTBD 24 h 55 h 35 h 67 h 42 h 59 h 31 h