1 / 5

Type0 cable heating

Type0 cable heating. G.Gariano, C.Gemme, L.Rossi, F. Vernocchi INFN Genova Type0 cables will heat-up because of the Joule effect The cooler we can keep the cables, the lower the power because D R Al / D T~-0.4% per degree .

colin
Download Presentation

Type0 cable heating

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. Type0 cable heating G.Gariano, C.Gemme, L.Rossi, F. Vernocchi INFN Genova • Type0 cables will heat-up because of the Joule effect • The cooler we can keep the cables, the lower the power because DRAl/DT~-0.4% per degree. • We here try to evaluate the temperature the cable may get to and the actions to be taken. • We look at a 6-cable bundle of 80 cm mean length (min=75cm, max=85cm) and 2 Al conductors per Vddd and Vdda . We choose Iddd~0.9A and Idda~1.2A per cable giving a power of ~6W on the bundle and we see how the bundle heats-up 25/11/03

  2. Temperature measured with a PT100 inside the cable bundle (if outside +2.5oC typ.)  If the cable is “alone” DT increases only by ~3oC above ambient. T-gain when (loosely) tacked to stave

  3. Cable bundle reaches Tasymptote in 3’ to 4’, Ta is ~20oC above ambient if the cable is “free” (~25oC above if in a confined space (a plastic tube of 50 cm and 1.6cm dia.)). • The bundle has been tacked to a stave cooled by liquid. The tacking has been done in 2 positions 20cm apart for a length of ~1cm using SE4445. Tstave~10oC, Tambient~25oC Tack1(T~20) T~30

  4. Tack2(T~20) Heat on connectors is not negligible

  5. Tacking to stave Omega with SE4445 helps in keeping T low. Already with two tacks we gain some 15oC. • More measurements must be done (with cool stave in cool environment), but running the cable at 10oC or below seems possible. • The power dissipated in the cable at various temperatures has been measured and ranges from 5.8W@<T>~0 to 6.3W @<T>~40C. The T-dependence is weaker than expected. • Running cold may imply some 5% less power (and less DV) than measured at room temperature. • Tacking cables to back-of-stave or other cool parts must be studied and should be implemented for safer handling and operation.

More Related