6th Evian Workshop

Session

Machine Protection

16 Dec 2015, 16:15

Hotel Hilton

Conveners

Machine Protection

• Markus Zerlauth
• Wolfgang Bartmann

Presentation materials

Evian15_MP_Session_WB_MZ.docx

Evian15_MP_Session_WB_MZ.pdf

26. Have we been operating safely in 2015?

Daniel Wollmann

16/12/2015, 16:15

During LS1 most machine protection systems (MPS) have undergone significant changes. A full (re-) commissioning of the MPS has been performed before and respectively during beam commissioning in 2015, followed by a step-wise intensity ramp-up to reach nominal beam intensities. This contribution will summarize the results of the MPS commissioning and the intensity ramp-up, focusing on issues...

27. How to obtain clean injection?

Florian Burkart

16/12/2015, 16:40

During 2015, injections of 144 bunches into the LHC induced losses of up to 88% of the dump thresholds on the TDI. During run 2 these losses were studied in greater detail with diamond based particle detectors. It was found that the main loss contribution is due to ghost bunches, originating from the SPS, swept over the TDI during the rise and fall time of the injection kicker magnet MKI. This...

28. BLM thresholds evolution and 2106 proposal

Matti Kalliokoski

16/12/2015, 17:05

In total, over 5700 changes to the BLM thresholds were made during 2015. The new thresholds are based on the operational experience from Run 1, on new simulation models and on results from quench tests performed so far. Following the first experiences with operation at 6.5 TeV, a series of adjustments were made throughout the first operational year of Run 2. An overview of the main changes...

29. BLM thresholds and damage limits for collimators

Alessio Mereghetti

16/12/2015, 17:25

LHC operation at 6.5TeV required major changes of the collimator BLM thresholds adopted in Run 1. At startup in 2015, the BLM thresholds at collimators were set by scaling the values in 2012 to 6.5TeV. This approach enabled a smooth commissioning during the intensity ramp up period. Throughout 2015, thresholds have been further optimized to allow for 200kW primary betatron losses, to...

30. BI for machine protection

Thibaut Lefevre

16/12/2015, 17:45

This contribution reviews the status of three main beam instruments currently in use for machine protection purposes: the IP6 interlock BPMs, the Beam Current Change Monitor (BCCM) and the abort gap monitor (BSRA). Their performance during 2015 operation and observed limitations will be discussed as well as plans for future improvements and/or alternative solutions in order to allow for...