Choose timezone
Your profile timezone:
ad-hoc BLM Thresholds Meeting (Pb run 2024)
→
Europe/Zurich
774/2-058 (CERN)
Participants: Belen, Natalia, Volodymyr, Federico, Luisa, Roderik, Sara
- Luisa:
- Shows the results from case 1b
- Shorter time included
- Case 1b load more concentrated on active surface
- Higher temperatures on the inermet blocks
- Similar structural behavior (deposited energy is the same)
- Scraping case
- More deflection of the jaws, inducing more stress on the pipes
- Simplified model with only blocks simulated to understand how far we are from the real peak power
- Underestimating the maximum temperature on the blocks
- The structural response of the jaw does not probably change much
- Accidental scenario, abnormal
- 3kW deposited should be ok regardless of the loss scenario
- Shows the results from case 1b
- Anton:
- Would like to increase BLM thresholds for intermediate and longer RS compared to 2023 Pb run
- Relation between BLM response and power deposition?
- TCT BLM response depends on the BLM position wrt the collimator
- Simulated BLM response for a matrix of different BLM positions
-
- For direct impacts on the TCTs
-
- BLM response also depends on deposited energy
- If we take case 1a as a reference for the thresholds, case 2 would dump the beam at a much lower power deposition
- Difference of a factor of 3 between highest and lowest BLM response for case 1a (in Gy per impacting ion)
- Considering case 1a:
- For RS06, we could go a factor of two higher in the master thresholds (for the halo scenario)
- Would be safe from the mechanical point of view
- For higher RS, could go even higher
- For RS06, we could go a factor of two higher in the master thresholds (for the halo scenario)
- Simulate also longer time for RS12 - ~83 s for TCTs - 1a case
- Simulate also 10ms scraping case, 20kW deposited
- Should we propagate the changes even for lower energies in the ramp?
- Increase everything by a factor of 3
- TCLDs:
- In the same family as the W TCLs in IR1/5
- Would change all
- Create dedicated family?
- TCLD_W family with additional factor of 2
- Simulated BLM responses matches very well with TCTs
- RS07 could be increased by factor of 2
- In the same family as the W TCLs in IR1/5
- TCLs are retracted, should not be a problem
- Natalia:
- Same power loss targets at injection
- Some upscaled BLM signals above thresholds from end of 2023 ion run
There are minutes attached to this event.
Show them.
