slide1 n.
Download
Skip this Video
Download Presentation
Dynamic field effects in main LHC dipoles

Loading in 2 Seconds...

play fullscreen
1 / 4

Dynamic field effects in main LHC dipoles - PowerPoint PPT Presentation


  • 81 Views
  • Uploaded on

Dynamic field effects in main LHC dipoles. During ramps, boundary-induced coupling currents (BICCs) are induced in the LHC cable creating a field ripple with period  twist pitch length

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Dynamic field effects in main LHC dipoles' - brock


Download Now An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
slide1

Dynamic field effects in main LHC dipoles

  • During ramps, boundary-induced coupling currents (BICCs) are induced in the LHC cable creating a field ripple with period  twist pitch length
  • BICCs diffuse along the cable during stationary excitation with time constants  1000 s, leading to demagnetization of allowed harmonics of the order of a few units (decay)
  • As soon as current ramping is resumed, the field snaps back to (almost) the previous hysteresis curve with an exponential law vs. magnet current
  • Decay and snapback amplitudes depend to some extent upon all cycle parameters, mostly: - increase (~linearly) with pre-cycle flat-top current- increase with pre-cycle flat-top duration- decrease with pre-injection duration
slide2

Decay and snapback in model LHC dipoles vs. injection current

Parametric study carried out on 1 m long model magnet shows no clear evidence of the dependence of absolute harmonic effects vs Iinj

slide3

Decay and snapback in main LHC dipoles vs. injection current

Absolute B3 decay: reduction of 15% from 0.45 TeV to 1 TeV injection(influence of longer ramp to injection not taken into account)

slide4

Decay and snapback in main LHC dipoles vs. injection current

Normalized B3 decay: reduction of a factor 2.6 from 0.45 TeV to 1 TeV injection