1 / 8

Study of Cross-talk on the MAPMT-to-Hybrid cable

Study of Cross-talk on the MAPMT-to-Hybrid cable. Overview. As HV is increased beyond ~600V, we start to see capacitive coupling between channels. Initial studies indicated it was due (mostly) to the flat cable connecting the baseboard to hybrid. . Possible Short-Term Solutions.

brand
Download Presentation

Study of Cross-talk on the MAPMT-to-Hybrid cable

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. Study of Cross-talk on the MAPMT-to-Hybrid cable

  2. Overview • As HV is increased beyond ~600V, we start to see capacitive coupling between channels. • Initial studies indicated it was due (mostly) to the flat cable connecting the baseboard to hybrid.

  3. Possible Short-Term Solutions • Use the same cable (~3”) but with spacing between the wires. • Use a very short cable of 0.5” (approximated a direct connection from baseboard to hybrid) • Study each alternative cable as a function of HV and Threshold.

  4. Schematics MAPMT Optical fiber LED

  5. Plots Old cable (3”) at 600V and threshold 117 New cable (3”) at 600V and threshold 117 Old cable (3”) at 700V and threshold 117 New cable (3”) at 700V and threshold 117 Old cable (3”) at 700V and threshold 105 New cable (3”) at 700V and threshold 105

  6. Plots Old cable (3”) at 750V and threshold 105 New cable (3”) at 750V and threshold 105 Old cable (3”) at 750V and threshold 90 New cable (3”) at 750V and threshold 90 Old cable (3”) at 800V and threshold 90 New cable (3”) at 800V and threshold 90

  7. Plots Old cable (3”) at 700V and threshold 105 Old cable (3”) at 800V and threshold 90 New cable (3”) at 700V and threshold 105 New cable (3”) at 800V and threshold 90 Short cable (0.5”) at 700V and threshold 105 Short cable (0.5”) at 800V and threshold 90

  8. Summary • Both the split cable and short cable reduce the interwire coupling, but neither eliminates it. • Possible other sources/tests. • Make a cable with 2 wires only at positions 1 & 32and check if coupling still persists. • Connectors? • Traces on hybrid, baseboard? • Possibly try injecting charge directly into the pre-amp through a 10 pF cap (nominally, 62Ke-/mV)

More Related