1. RBX Cooling Dan Karmgard for the HCAL RBX Group

2. 1 Mar 01 2RBX Production Readiness Review - D. Karmgard, University of Notre Dame Outline Introduction General Routing of RBX Services System Specifics RBX Power Consumption RBX Cooling Scheme Test Data Cooling in HE and HO Summary

3. 1 Mar 01 3RBX Production Readiness Review - D. Karmgard, University of Notre Dame Introduction Scheme to cool the HCAL readout system –electronics generate heat –heat affects the lifetime of the cards –cooling prolongs the card lifetime –reduces frequency of failure and access This is necessarily HB centric –other subsystems are not as far advanced –HE and HO will be discussed briefly at the end

4. 1 Mar 01 4RBX Production Readiness Review - D. Karmgard, University of Notre Dame Introduction Continued Discuss general scheme for cooling RBX What kind of power dissipation is expected –along with safety factors The specifics of the RBX cooling –for the box in general –for the electronics in the box Show results of testing this method

5. 1 Mar 01 5RBX Production Readiness Review - D. Karmgard, University of Notre Dame Routing of Water Services Graphic shows general routing of the lines –each HB RBX gets an inlet and outlet Detail shows a connection to a single RBX

6. 1 Mar 01 6RBX Production Readiness Review - D. Karmgard, University of Notre Dame Water Services Flow Rate –a flow rate of 1.5 L/min should be sufficient –flow of 0.83 L/min gives temperature rise of approximately 1 ° C with one RM installed dissipating 53W Standard cooling water chemistry –Nalco 39-M corrosion inhibitor by-pass filter –UV lamp biocide station subambient inlet temperature and return slightly above ambient

7. 1 Mar 01 7RBX Production Readiness Review - D. Karmgard, University of Notre Dame RBX Power Dissipation Power Dissipation –1W/channel –Calib, CCM  6W/card –QIE  9W/card 6 ch + 3 regulators –HB RBX 23 QIE 3 CCM 2 Calibration  237 W/RBX Safety Factor of 1.7 x Cooling aims to handle 400W for each RBX Expect 8.5 kW of power in HB

8. 1 Mar 01 8RBX Production Readiness Review - D. Karmgard, University of Notre Dame Cooling at 400W

9. 1 Mar 01 9RBX Production Readiness Review - D. Karmgard, University of Notre Dame RBX Cooling Scheme Water flow through –3/16 in. ID copper pipe –pressed into Al shell –top and bottom serially connected pipes are soldered together with a sleeve flex hose connection into system Pipes are only over electronics regions

10. 1 Mar 01 10RBX Production Readiness Review - D. Karmgard, University of Notre Dame Thermal Coupling Cooling by conduction –good thermal contact –tight fit is necessary manufacturing tolerances Cards placed in Al channels and packed with thermal foam –provides a thermal path from the card to cooling

11. 1 Mar 01 11RBX Production Readiness Review - D. Karmgard, University of Notre Dame Thermal Extrusions Al extrusions provide –thermal conduction –solid mounting for card –tight fit to RBX –rigidity for the module Foam provides –electrical isolation –thermal conduction from the card surface to the Al Extrusions Modularity as a bonus

12. 1 Mar 01 12RBX Production Readiness Review - D. Karmgard, University of Notre Dame RBX Thermal Tests

13. 1 Mar 01 13RBX Production Readiness Review - D. Karmgard, University of Notre Dame Card Temperature Gradient 5-100-510-15>5045-5040-4515-2020-2525-3035-4030-35 Legend Ambient temperature = 16.3 Flow Rate = 0.83 L/min 19.8 41.245.043.4 41.941.645.2 40.944.042.9 38.541.540.4 PowerPower ReadoutReadout 17.0 18.4 15.5 28.5 16.2

14. 1 Mar 01 14RBX Production Readiness Review - D. Karmgard, University of Notre Dame RBX Thermal Tests

15. 1 Mar 01 15RBX Production Readiness Review - D. Karmgard, University of Notre Dame Card Temperature Gradient 5-100-510-15>5045-5040-4515-2020-2525-3035-4030-35 Legend Ambient temperature = 16.4 Flow Rate = 0.83 L/min 19.7 41.144.843.2 41.841.545.1 40.843.942.8 38.441.440.3 PowerPower ReadoutReadout 16.9 18.4 15.4 28.5 16.1

16. 1 Mar 01 16RBX Production Readiness Review - D. Karmgard, University of Notre Dame HE RBX Cooling HE is different than HB –6 fewer QIE / RBX –54W less power Geometry very different –cooling works the same Cu pipes pressed into Al –pipe routing is messy –single – sided cooling of Calib/CCM components Not yet tested –should work as well as HB

17. 1 Mar 01 17RBX Production Readiness Review - D. Karmgard, University of Notre Dame HO RBX Cooling HO RBX –less power than HE –not fully designed –very tight constraints –little vertical space Similar scheme to HE –use pipes pressed into walls between the RMs Commercially available parts http://www.acktechnology.com/

18. 1 Mar 01 18RBX Production Readiness Review - D. Karmgard, University of Notre Dame Summary We can suitably cool the RBX electronics –cooling is sufficient with a 1.7 x safety factor No special requirements Monitoring by the CCM –fieldbus connection to the slow control system –described in the monitoring section HB is tested and ready to go –HE and HO are not as far along –Similar design - presents no special problems