Water Cooling System of PETRA III. MAC - Meeting at DESY 11/08/2004 Jensen / Wanning - MKK - 1

Transcription

1 Water Cooling System of PETRA III MAC - Meeting at DESY 11/08/2004 Jensen / Wanning - MKK - 1

2 Overview: Introduction General Design Scheme of water cooling systems Temperature stability of the cooling water Temperature measurements at DORIS Magnet and chamber cooling in the old octants RF water cooling system Magnet vibration by throttling the cooling water Cross section of the tunnel and experimental hall 11/08/2004 Jensen / Wanning - MKK - 2

3 Introduction Rebuilding of ~ 300 m of the storage ring from PETRA-hall NE to E Building an experimental-hall with measuring positions 11/08/2004 Jensen / Wanning - MKK - 3

4 PETRA III with the Experimental Hall RF water cooling station PETRA South PETRA hall E Water cooling station NE PETRA hall NE 11/08/2004 Jensen / Wanning - MKK - 4

5 Water Cooling Design: 2 locations for the water cooling supply: PETRA hall NorthEast: magnet and vacuum chamber cooling chilled water production and cooling water supply for the experimental hall PETRA hall South: RF cooling 2 water circuits for aluminium and copper magnet coils Hybrid dry coolers for recooling are designated 11/08/2004 Jensen / Wanning - MKK - 5

6 Overview of the Water Cooling System 11/08/2004 Jensen / Wanning - MKK - 6

7 Technical Data of the Water Cooling System Temperatures of the cooling water: Return pipe of the hybrid coolers: 28 C Supply temperature for tunnel: 30 C Temperature stability better than ± 0,5 C Achievable stability ± 0,2 C Variable fan speed for long time regulation 3 directional control valve for short time regulation Water pumps with variable speed against pressure fluctuation 11/08/2004 Jensen / Wanning - MKK - 7

8 Scheme of water cooling circuit 11/08/2004 Jensen / Wanning - MKK - 8

9 Pressure and Temperature Fluctuations Pressure fluctuations cause fluctuations of the temperatures in the water cooling system Assumption: p = 0.2 bar 3 7 bar p V 2 V = 1.03 = C T = 0.43 C Temperature fluctuation has be damped by the regulation 11/08/2004 Jensen / Wanning - MKK - 9

10 Temperature Measurements at DORIS long time stability short time stability 11/08/2004 Jensen / Wanning - MKK - 10

11 Conclusion of the DORIS water temperature measurements ± 0,5 C is state of the art ± 0,2 C for short time stability is achievable ± 0,1 C in topping up mode should be feasible 11/08/2004 Jensen / Wanning - MKK - 11

12 Magnet Cooling in the old 7 Octants Synchrotron radiating power is ma one water circuit for vacuum chamber and magnet cooling: serial connection of vacuum chamber magnet coils cooling water supplies first the vacuum chamber and than flows through the magnet coils of the dipole, quadrupole and sextupole this leads to temperature rise of ma along the vacuum chamber over 7 m this fulfils the requirement 11/08/2004 Jensen / Wanning - MKK - 12

13 Vacuum Chamber and Magnet Cooling 11/08/2004 Jensen / Wanning - MKK - 13

14 RF Water Cooling System 2 RF-Systems are located at hall SR and SL The water cooling supply is at hall SR The cooling water flows first through the cavities and than through RF absorbers The circulators have a constant 30 C inlet temperature from a heated buffer tank 11/08/2004 Jensen / Wanning - MKK - 14

15 Sketch of RF Water Cooling System 11/08/2004 Jensen / Wanning - MKK - 15

16 Magnet Vibration Vibration caused by cooling water throttling investigated Measuring setup in experimental hall 1 Quadrupole and Sextupole unit of PETRA 3 sensors in x-, y-, z-plane on the sextupole S0 vertical plane S1 horizontal plane S2 longitudinal plane Sensor S3 on the quadrupole as a reference 11/08/2004 Jensen / Wanning - MKK - 16

17 Magnet unit of PETRA 11/08/2004 Jensen / Wanning - MKK - 17

18 Sensor Disposition 11/08/2004 Jensen / Wanning - MKK - 18

19 Measurements Vibration measurement without water flow with unthrottled water flow with throttled water flow at nominal value 11/08/2004 Jensen / Wanning - MKK - 19

20 Measurement Results Vibration measurement without water flow S 0 y-plane S 1 x-plane S 2 z-plane S 3 y-plane quadrupole Amplitude in mm 11/08/2004 Jensen / Wanning - MKK - 20

21 Measurement Results Vibration measurement with unthrottled water flow S 0 S 1 S 2 S 3 Amplitude in mm 11/08/2004 Jensen / Wanning - MKK - 21

22 Measurement Results Vibration measurement with throttled water flow S 0 S 1 S 2 S 3 Amplitude in mm 11/08/2004 Jensen / Wanning - MKK - 22

23 Conclusion of the investigation No significant differences without and with water flow Amplitude is about 0,001 mm Throttling the water flow has no effect on the vibration 11/08/2004 Jensen / Wanning - MKK - 23

24 Pipe and Bus Bar Installation in the Tunnel 11/08/2004 Jensen / Wanning - MKK - 24

25 Cross Section of the Experimental Hall 11/08/2004 Jensen / Wanning - MKK - 25