1. HF Cabling Upgrade Options T. Shaw 30-OCT-2010 1 HF 2012 Upgrade Meeting 30-OCT-10 T. Shaw

2. Existing RoBox 24 PMTs/RoBox Signal & Reference signals sent on a Pair of Coax for each PMT 2HF 2012 Upgrade Meeting 30-OCT-10T. Shaw

3. Current HF FE Module Front Panel Each FE module reads out 6 QIEs. 3 HF 2012 Upgrade Meeting 30-OCT-10 T. Shaw

4. Upgrade Current plans – Fit 2x or 4x cabling into same space; no degradation in performance – Use same FE modules Some kind of patch panel near FE crates to convert new cabling to present connectors. 4 HF 2012 Upgrade Meeting 30-OCT-10 T. Shaw

5. Questions Timeline for decision on how many readout channels / PMT? (2 or 4 anode readout) How much space is available in cable path? – Are we limited to what we have? Could it be doubled?... Does entire cable plant need to be replaced in 2012? Any chance of delaying this if we have a cable adapter pluggable into the outside of the RoBox? HF 2012 Upgrade Meeting 30-OCT-10 5T. Shaw

6. Possible Cable Solutions T. Shaw HF 2012 Upgrade Meeting 30-OCT-10 6

7. Tyco Electronics Z-Pack connector line offers dense cable assemblies 7 HF 2012 Upgrade Meeting 30-OCT-10 T. Shaw

8. Samtec offers ribbon coax/twinax cable assemblies 8 HF 2012 Upgrade Meeting 30-OCT-10 T. Shaw

9. Samtec V-Port Cables T. Shaw HF 2012 Upgrade Meeting 30-OCT-10 9

10. Samtec V-Port Cables T. Shaw HF 2012 Upgrade Meeting 30-OCT-10 10 24 pairs/cable Fully Shielded Molded cable boots 5 meter lengths available Can be ordered with 30 AWG twinax 100ohm differential Or 26AWG MiniSkew Low Skew 100ohm differential pair Connector size ~ 1.7” x.24”

11. Samtec V-Port Cables T. Shaw HF 2012 Upgrade Meeting 30-OCT-10 11 24 signal pairs/cable would mean we would use 2 or 4 per RoBox Cables < $93

12. Samtec Coax 12 HF 2012 Upgrade Meeting 30-OCT-10 T. Shaw

13. Spec’s of current Cable 13 HF 2012 Upgrade Meeting 30-OCT-10 T. Shaw

14. Conclusions Things to do – Check with vendors on what is possible – coax/twinax, cable gauge, 5 meter length?, connector availability – Order some cables 5 meter cables – Get a working teststand! – Look at possibility of back-termination of cable run 14 HF 2012 Upgrade Meeting 30-OCT-10 T. Shaw

15. Extra Slides T. Shaw HF 2012 Upgrade Meeting 30-OCT-10 15

16. Previous Cable Tests From Original Selection Process Previous cable studies from the first time around can be found at: http://cmsdoc.cern.ch/cms/HCAL/document/www- ppd.fnal.gov/tshaw.myweb/CMS_PMT_Cable_Studies.html http://cmsdoc.cern.ch/cms/HCAL/document/www- ppd.fnal.gov/tshaw.myweb/CMS_PMT_Cable_Studies.html T. Shaw HF 2012 Upgrade Meeting 30-OCT-10 16