8th LHC Operations Evian Workshop

Session

Session 1: Availability & System Performance

12 Dec 2017, 11:00

Hotel Ermitage

Conveners

Session 1: Availability & System Performance

• David John Walsh (CERN)
• Laurette Ponce (CERN)

Session 1: Availability & System Performance

• David Nisbet (CERN)
• Slawosz Uznanski (CERN)

Presentation materials

EvianSummary-2017-Session1B_v1.docx

EvianSummary-2017-Session1B_v1.pdf

4. Availability 2017: Setting the scene (25' + 5')

Dr Benjamin Todd (CERN)

12/12/2017, 11:00

Abstract:
This paper summarises the LHC machine availability for the standard proton physics period in 2017. The paper considers first operational aspects, such as beam mode ratios, beam dump causes, fill length and turn-around. Following this, a detailed breakdown of all faults and their impact upon LHC is given, with notable faults and new root causes identified. This paper concludes with...

5. LHC Operation (20' + 5')

Dr Mirko Pojer (CERN)

12/12/2017, 11:30

The time spent in Operations in 2017 was about 30% of the total time for physics, much larger than what achieved in previous years. This will be analyzed and possible causes drawn. Operations will then be split in its separate phases and some consideration and suggestions for optimization will be proposed.

6. Availability 2017: Injectors (20' + 5')

Bettina Mikulec (CERN)

12/12/2017, 11:55

Abstract:
For the first year the Accelerator Fault Statistics (AFT) was implemented and employed by the LHC injectors. In this paper, the LHC downtime due to the injector chain will be analysed with data from AFT and compared to last year [1]. The main root faults from the injectors will be explained. In addition, it will be outlined how AFT is currently used in the injectors, open issues and...

8. Systems Performance: Circuits (20' + 5')

Ivan Romera Ramirez (CERN)

12/12/2017, 13:45

Abstract:
The performance of the LHC magnet circuits for the proton physics run in 2017 is evaluated. This contribution focuses on the availability of magnet powering (PC) and protection systems (QPS, EE, FMCM and Interlocks) and evaluates the impact of the new deployments, mainly the FGClite and RPADO power converters, on the overall performance of the machine. Finally, a comparison with 2016...

10. Systems Performance: Beam Instrumentation (15' + 5')

Volker Schramm (Universitaet Stuttgart (DE))

12/12/2017, 14:10

Abstract:
In this talk, the dependability of CERN’s Beam Instrumentation (BI) in 2017 is presented. All faults which contributed to LHC downtime are analysed, categorised and compared to previous years to isolate recurrent failures and evaluate trends. Special attention is given to the Beam Loss Monitoring system and their Sanity Checks which was the highest contribution to the BI downtime in...

7. Systems Performance: Beam Dump Block (15' + 5')

Marco Calviani (CERN)

12/12/2017, 14:30

Abstract:
This contribution will detail the summary of the LHC TDE dump block observations during the 2017 operational run, eventual limitations and the current plans for the YETS. Details will be provided on the efforts made to reduce potential downtime of the machine, including the interferometer readings, the redesign of the downstream window and graphite oxidation studies. Long-term...

9. Systems Performance: RF (20' + 5')

Helga Timko (CERN)

12/12/2017, 14:50

Abstract:
The availability of the LHC ADT and RF systems in 2017 is presented in details, including high- and low-power RF and RF controls. A comparison with 2016 availability is performed. The full-detuning scheme, commissioned early this year, has been operational throughout the year and the first experience with this scheme is summarised. New operational diagnostics, implemented this year,...

11. AFT & Availability: Analysis and use (20' + 5')