1 / 12

Analysis of quench limits for ADT fast quench test

23.08.2013, QTAWG meeting. Analysis of quench limits for ADT fast quench test. FLUKA input. Integrated energy deposition. source: A. Lechner , N. Shetty , FLUKA. Upper bound for quench limit.

zaide
Download Presentation

Analysis of quench limits for ADT fast quench test

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. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. 23.08.2013, QTAWG meeting Analysis of quench limits for ADT fast quench test

  2. FLUKA input • Integrated energy deposition source: A. Lechner, N. Shetty, FLUKA

  3. Upper bound for quench limit • Due to the large uncertainties only an upper bound of 420 mJ/cm3 can be obtained from the FLUKA analysis.

  4. Lower bound for quench limit • The preceding test with ~1/2 the bunch intensity did not result in a quench. From FLUKA we obtain a lower bound of 200 mJ/cm3.

  5. QP3 model results - disclaimer • Note that the model of the He cooling in the millisecond range is not validated by experiment (experiments in that range are exceedingly difficult). Numerous free parameters!

  6. Model assumptions QP3/Thea/ZeroDee Comparison in progress

  7. Model Parameters QP3/Thea/ZeroDee Comparison in progress *… corresponds to 100% filling of voids **… corresponds to 50% avg. filling of voids

  8. QP3 model results • The computed quench limit with the above parameters is 75 mJ/cm3 peak on the inner radius. • Variation of parameters gives an uncertainty within the model of ±40 mJ/cm3.

  9. Impact of updated model parameters • Adjustments: Filling 100% of voids with helium (rather than 35%) • Increasing film-boiling (in He I) heat conductivity from 200 to 500 W/m2/K. 4 TeV ADT-test parameters FLUKA bounds 3.5 TeV standard parameters ADT test @ 4 TeV QP3 model results

  10. Conclusion • Parametric studies will continue to find a realistic parameter set. • How large is the uncertainty in the FLUKA values?

  11. Interpreting QPS PM file • 2+2 poles are compared to compute U_QSO. source: A. Priebe beginning of current decay diode opens heater firing quench in half 1 heaters effective reduced diode forward voltage almost symmetric quench in half 2

More Related