Future CMS Tracker Cooling systems Hans Postema CERN

CMS tracker upgrades • Phase 1: Upgrade of the pixel detector only, to be

System options (1) • Based upon LHCb experience, CO 2 cooling looks like a

System options (2) • For the Phase 2 – Full tracker upgrade, CO 2

Backup options • Applies to both phase 1 and phase 2 – Liquid cooling

More crucial issues • thermal contacts and joining techniques – Past experience is good,

The keys to success • Admittedly, detector cooling is not a trivial issue •

Interested in future cooling Fermilab (Simon Kwan, Rich Smith, Terry Tope) Pixel Purdue University

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Future CMS Tracker Cooling systems Hans Postema (CERN) 30 October 2008 Hans Postema (CERN) 1

CMS tracker upgrades • Phase 1: Upgrade of the pixel detector only, to be installed in ~2013 • Phase 2: Upgrade of the full tracker, to be installed in ~2017. 30 October 2008 Hans Postema (CERN) 2

System options (1) • Based upon LHCb experience, CO 2 cooling looks like a very good candidate for the Pixel upgrade • Questions: – Feasibility ? • Most likely yes – Sufficiently advantageous? • To be determined but looks favorable 30 October 2008 Hans Postema (CERN) 3

System options (2) • For the Phase 2 – Full tracker upgrade, CO 2 cooling has also attracted large interest • Questions: – Feasibility? • Probably yes but work is required, system is much larger than LHCb – Sufficiently advantageous? • Very difficult to estimate at this point, extensive investigations are required 30 October 2008 Hans Postema (CERN) 4

Backup options • Applies to both phase 1 and phase 2 – Liquid cooling – Other evaporative cooling 30 October 2008 Hans Postema (CERN) 5

More crucial issues • thermal contacts and joining techniques – Past experience is good, future design work to improve performance • high thermal conductivity materials – Past experience is good, investigate to improve performance • pipe materials and connections – A difficult matter, always much room for improvement • leak measurements – Establish solid methods and quality standards • instrumentation & diagnostic tooling • thermal modelling 30 October 2008 Hans Postema (CERN) 6

The keys to success • Admittedly, detector cooling is not a trivial issue • Our community with many (geographically) separated groups is not the simplest one • The keys to success: – Team spirit – Excellent communication channels 30 October 2008 Hans Postema (CERN) 7

Interested in future cooling Fermilab (Simon Kwan, Rich Smith, Terry Tope) Pixel Purdue University (Kirk Arndt) Pixel University of Iowa (Charles Newsom) Pixel PSI (Roland Horisberger, Stefan Koenig) Pixel IPNL Lyon (Didier Contardo, Nick Lumb) Karlsruhe University (Wim de Boer) RWTH Aachen (Lutz Feld) CERN (Tapio Niinikosky, Friedrich Haug, Jihao Wu, Torsten Koettig, Antti Onnela, Michele Battistin, Paola Tropea, Duccio Abbaneo) • OTHERS (please let me know) • Please correct me where I am wrong • • 30 October 2008 Hans Postema (CERN) 8