1. AIDA Traci commissioning LHCb – CO 2 cooling meeting 18 March 2015 Kamil Wojdyla, Lukasz Banasik, Nicola Spadavecchia, Tomasz Kucharski, Piotr Dziurdzia, Maciej Ostrega, Lukasz Zwalinski, Bart Verlaat 1

2. Traci-3 P&ID 2 1/8”1/8” AV104 HX101 FL101 PT102 TT102 SC102 PT101 TT101 SC101 FT103 FL103 AC202 nc HX201 MV205 PT205 MV202 EV203 TX204 GP201 EH204, TT204 EH205, TT205 EH110 TT110 AC110 PT110 BD110 PT103 TT103 TT106 LP101., AV105 MV104 MV105 SV105 Chiller unit CO 2 unit CO 2 local box 1/4”1/4” 1/8”1/8” 1/8”1/8” 1/4”1/4” 1/4”1/4” Flexline Experiment connection Experiment vacuuming and venting MV110 TT204

3. Traci-3 update features Traci-3 has been updated wrt Traci-2 –PLC + touchscreen control –HNP-ceramic pump Traci-3 build from a revised design –Serial production oriented 3 3 Traci-2 Touch screen user interface

4. Traci-3 build in series (4) from a revised drawing package 4

5. Traci-3 internal 5 5 CO 2 foam boxHNP 11558 pump Accumulator Flow meterPLCTouch screen

6. HNP pump and chiller 6 6 Chiller unit Pump motor outside foam box Mounting and sealing flange Cold pump Filter

7. Experiment connection box (Local box) 7 Liquid out Vapor return Experiment vacuum and venting Experiment flow control valve Experiment shut-off valve Experiment safety valve Experiment shut-off and venting valve By-pass flow control valve Interlock sensor connection All connections are ¼”VCR male Dummy load heater (670 W)

8. Performed commissioning tasks last month PID controllers corrected for pump and heater, (PID was not working at all after TRACI restart) Chiller heater dependent logic changed, Heater’s logic thresholds tuned, Sub cooling 102 and 103 added, New warm start up procedure introduced (allows TRACI to start if ambient temperature >20C), DP110 on filter before the pump added for monitoring purpose, Pump high and low speed limits added, Web servers updated, PLC core code corrected wrong OBs (Operation Blocks) has been used in software, Pump controller wiring problem solved, Chiller PT’s scaling corrected, Chiller’s thermostatic expansion valve preliminary regulation is done, Pump ramping speed introduced ( to avoid pump stopping each time we change the speed request) 8 After these the performance testing could start

9. Traci-3 pump commissioning HNP 11558 Traci-3 AIDA started commissioning in February. –1 st find a good operational range of the pump –Pump is expensive and may not be destroyed due to stupidities –Main concern: How to avoid overloading High dP at low flows is bad for the pump due to large self heating = cavitations risk Traci has 2 flow circuits: –Experimental flow and by-pass flow –With a small experiment flow the by-pass must be open –A safe way is having the by-pass open at all times. Drawback: higher pump flow may reduce operation at high temperatures. –When large experiment flows are present, by- pass can be closed to gain capacity at high temperatures –Best approach, but not advisable to inexperienced users: Close the by-pass the same way as the experimental valve is closed, as if they are gear connected. The 1 st operation of the pump and comparison to the performance curves measured in the pump test stand revealed a wrong control of the pump. –Was corrected with the proper jumper settings in the control Pump limits set: –1 bar <dP <8 bar –Pump speed (1000-3500 rpm) –Pump sub cooling > 6K 9 By-pass impedance (example) By-pass + experiment impedance (Example) dP limit Experiment flow dP limit By-pass flow Operational zone Small HNP limit

10. Pump performance test HNP 11558 10 Half open valve, should not be closed more than this (Too much self heating) Small HNP limit (HNP 7255) 1000 rpm 1750 rpm 2 settings used for heat load tests:

11. Traci-3 operational range 11 Operational zone Chiller capacity continues Cooling reduction expected due to expansion valve limitation The additional by-pass flow must be considered for the maximum temperature range 50% vapor quality Extra margin (Not used due to sub cool protection) Pump sub cooling 250 W

12. Traci-3 temperature stability 12 150 Watt on 150 Watt off 150 Watt on 2-phase temperature Pump outlet Pump inlet

13. Flow and dP control Traci-3 has flow control and dP control. dP@flow setpoint > dPsetpoint: –dP control dP@flow setpoint < dPsetpoint: –Flow control Controls implemented and working but need still tuning for stability 13 dP limit Flow control dP control

14. Conclusions Traci-3 Aida is under commissioning and results look good. Preliminary performance tests carried out this week, more tests will follow. –Flow and dP tuning –Tests above 300 W –Max SP temperature vs flow –Finding the proper by-pass procedure Etc… 14