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CMS Upgrades

CMS Upgrades. Infrastructure Constraints Magnus Hansen CMS Upgrade Workshop at FNAL 20091028 - 20091030. Pre-amble. The current CMS has been in commission for the last two years CMS systems are generally ready for first beam but are we able to take high quality physics data?

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CMS Upgrades

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  1. CMS Upgrades Infrastructure Constraints Magnus Hansen CMS Upgrade Workshop at FNAL 20091028 - 20091030

  2. Pre-amble • The current CMS has been in commission for the last two years • CMS systems are generally ready for first beam but are we able to take high quality physics data? • Stage 1 upgrades will be installed and commissioned in a running experiment in a highly competitive physics environment • The cost for any CMS downtime due to upgrade activity is likely to dwarf the cost of the upgrade itself • Could have put some frightening numbers here M. Hansen, CERN. magnus.hansen@cern.ch

  3. Pre-amble • Upgraded systems need to operate in parallel with the previous, still fully functional, system it replaces • Comparison as well as Roll-back possible • Any required modifications on infrastructure need to be addressed > 1 year in advance • Need to install replacement system in USC55 prior to removing the soon to be replaced, leading to space problems M. Hansen, CERN. magnus.hansen@cern.ch

  4. Potential Trigger Upgrade Racks in S1 (USC55) M. Hansen, CERN. magnus.hansen@cern.ch

  5. One rack available in S1 • This rack is currently assigned to TTC • Empty and closed M. Hansen, CERN. magnus.hansen@cern.ch

  6. Potential Trigger Upgrade Racks in S1 (USC55) M. Hansen, CERN. magnus.hansen@cern.ch

  7. S2D • The racks in row D (ECAL) are empty and we should try to keep them that way M. Hansen, CERN. magnus.hansen@cern.ch

  8. S2E • The rack in row E (RCT) is empty and we should try to keep it that way • The RCT spare rack could possibly be emptied too when the current system is stable M. Hansen, CERN. magnus.hansen@cern.ch

  9. S2F • The racks in row F (HCAL) are empty and we should try to keep them that way too M. Hansen, CERN. magnus.hansen@cern.ch

  10. Real Estate Summary • S1 • One centrally placed rack available • S2 • One but potentially four racks available in row D • One but potentially two racks available in row E • Three and potentially four racks available in row F • Be aware that HCAL is planning to upgrade OD at the same time or perhaps one year ahead M. Hansen, CERN. magnus.hansen@cern.ch

  11. Rack cooling • The current thinking is to develop a trigger upgrade based on electronics modules with the AMC form factor (uTCA) • There are very cheap and handy bench top crates and controllers (MCH) available on the market • See for example G. Iles talk • The racks installed are equipped with vertical air flow cooling with air recycling and water-air heat exchangers • Desirable to install crates suitable for vertical air flow • The bench top crates are generally not suitable for vertical air flow, thus some effort may berequired M. Hansen, CERN. magnus.hansen@cern.ch

  12. Rack cooling • The racks installed are one meter deep • uTCA crates are about 30cm deep leading to a front – back air impedance mismatch and potentially inefficient cooling • Could profit from rear space to install optical patch panels and possibly remote power supply (only bulk 12V and 3V3 service power required) • Wish list • Internal rack air filter • Issues with resistance to fire etc. • Drawer-like heat exchanger • Possible to pull out and clean M. Hansen, CERN. magnus.hansen@cern.ch

  13. Summary • It is hard to pull off a successful upgrade • The space available in USC55 is barely adequate provided that HCAL does not need any additional racks for the OD upgrade • Space efficient rack layouts need to developed and tested in b904 together with or prior to the electronics development M. Hansen, CERN. magnus.hansen@cern.ch

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