1. Faculty of Physics, University of Belgrade Collaboration meeting, Budapest 15 th of May, 2012. ToF-L/R detector HV upgrade Jovan Puzović, Faculty of Physics, Belgrade

2. Faculty of Physics, University of Belgrade Collaboration meeting, Budapest, 15.05.2012. Page 2 out of 23 Jovan Puzović, Belgrade SHINE team Outline Short overview of ToF-L/R HV system Reason for upgrade of HV system Possible solutions for upgrade Description of chosen solution Current status of HV upgrade

3. Faculty of Physics, University of Belgrade Collaboration meeting, Budapest, 15.05.2012. Page 3 out of 23 Jovan Puzović, Belgrade SHINE team HV System Components 1)Main control unit – CAEN SY527 (10 units – working well – some aging problems) 2) HV Generator modules – CAEN 753 (10 units – 90 channels - working well) 3) HV Distributors modules – CAEN 933 (80 units – 1920 channels - lot of problems due to aging) 4) PC for control and monitoring (working well)

4. Faculty of Physics, University of Belgrade Collaboration meeting, Budapest, 15.05.2012. Page 4 out of 23 Jovan Puzović, Belgrade SHINE team System topology

5. Faculty of Physics, University of Belgrade Collaboration meeting, Budapest, 15.05.2012. Page 5 out of 23 Jovan Puzović, Belgrade SHINE team HV System Status Falling rate of HV distributors increase during last year During the November Be run (one month) we lose 4 distributors! 6 broken distributors sent to CAEN for reparation When we get them back, we will have only 4 spares, which is not enough to be safe for this year run

6. Faculty of Physics, University of Belgrade Collaboration meeting, Budapest, 15.05.2012. Page 6 out of 23 Jovan Puzović, Belgrade SHINE team Plan for upgrade 1)Replace two crates in the pit (480 channels) with the new system (first phase - 2012) 2)Replace another two crates (480 channels) with the new system (second phase – 2013 or 2014) 3) Use replaced crates as source of spare parts for the remaining crates

7. Faculty of Physics, University of Belgrade Collaboration meeting, Budapest, 15.05.2012. Page 7 out of 23 Jovan Puzović, Belgrade SHINE team Plan for upgrade QUESTION buy a new system from manufacturer (CAEN,…) OR produce a custom made, based on resistor divider

8. Faculty of Physics, University of Belgrade Collaboration meeting, Budapest, 15.05.2012. Page 8 out of 23 Jovan Puzović, Belgrade SHINE team CAEN System 1) SY4527 - Universal Multichannel Power Supply System – BASIC5680 EUR 2) A1932AP - SY1527 H.V. channels +3 KV/500 μA Distributor (48 ch) (Double width)6,085 EUR 3) A2932AP - SY1527 H.V. channels +3 KV/250 μA Distributor (48 ch) (Single width) 6,085 EUR 4) SW4536 - SY4527 Control software1,250 EUR

9. Faculty of Physics, University of Belgrade Collaboration meeting, Budapest, 15.05.2012. Page 9 out of 23 Jovan Puzović, Belgrade SHINE team CAEN System

10. Faculty of Physics, University of Belgrade Collaboration meeting, Budapest, 15.05.2012. Page 10 out of 23 Jovan Puzović, Belgrade SHINE team Price for CAEN system 1) 480 channels, phase 1 (two old crates) (5680+10*6085+1250+2*2000) ~72000EUR (150 EUR/ch) 2) 960 channels, phase 2 (four old crates) ~144000EUR (150 EUR/ch) FAR BEYOND OUR POSSIBILITIES! (and still have connectors problems!)

11. Faculty of Physics, University of Belgrade Collaboration meeting, Budapest, 15.05.2012. Page 11 out of 23 Jovan Puzović, Belgrade SHINE team Custom made system -Distributor made as a passive resistors divider -Setting of HV by hand (choosing R) -Basic idea originate from Dubna

12. Faculty of Physics, University of Belgrade Collaboration meeting, Budapest, 15.05.2012. Page 12 out of 23 Jovan Puzović, Belgrade SHINE team Custom made system Distributor made as a passive resistors divider Setting of HV by hand (choosing R) Include monitoring of HV by implementing microcontroller inside every distributor! Use the same connectors on the back as we already use Made the standard housing (bin) compatible with standard rack

13. Faculty of Physics, University of Belgrade Collaboration meeting, Budapest, 15.05.2012. Page 13 out of 23 Jovan Puzović, Belgrade SHINE team Price for custom system 1)480 channels, phase 1 (two old crates) 15000EUR (~31 EUR/ch) (two crates+20 distributors+4 spare) 2) 960 channels, phase 2 (four old crates) ~30000EUR (~31 EUR/ch) (four crates+40 distributors+8 spare)

14. Faculty of Physics, University of Belgrade Collaboration meeting, Budapest, 15.05.2012. Page 14 out of 23 Jovan Puzović, Belgrade SHINE team Advantage Electronics is not complicate, expecting robust design, stable work and lower falling rate Price is ~5 times less comparing to new CAEN system needed to replace the old one High voltage level can be monitored by control logic in crate by using already existed cables and software in PC located in counting room Without monitoring can be run in passive mode in old CAEN crate!

15. Faculty of Physics, University of Belgrade Collaboration meeting, Budapest, 15.05.2012. Page 15 out of 23 Jovan Puzović, Belgrade SHINE team Disadvantage Complicate procedure of setting and calibration Every distributor board will be unique (according to HV specification for their set of channels) Control electronic will not be finished until start of the summer run! (But distributor boards can run without monitoring!)

16. Faculty of Physics, University of Belgrade Collaboration meeting, Budapest, 15.05.2012. Page 16 out of 23 Jovan Puzović, Belgrade SHINE team Crate - front

17. Faculty of Physics, University of Belgrade Collaboration meeting, Budapest, 15.05.2012. Page 17 out of 23 Jovan Puzović, Belgrade SHINE team Crate - top

18. Faculty of Physics, University of Belgrade Collaboration meeting, Budapest, 15.05.2012. Page 18 out of 23 Jovan Puzović, Belgrade SHINE team Front panel

19. Faculty of Physics, University of Belgrade Collaboration meeting, Budapest, 15.05.2012. Page 19 out of 23 Jovan Puzović, Belgrade SHINE team Communication

20. Faculty of Physics, University of Belgrade Collaboration meeting, Budapest, 15.05.2012. Page 20 out of 23 Jovan Puzović, Belgrade SHINE team Shematic

21. Faculty of Physics, University of Belgrade Collaboration meeting, Budapest, 15.05.2012. Page 21 out of 23 Jovan Puzović, Belgrade SHINE team Current status Contract between NA61 and IPB (Institute for Physics, Belgrade) already signed Mechanical parts ordered, expecting to be delivered till the end of the May Amphenol connectors ordered from CAEN, will be delivered to the end of June (90 days!) Electrical design finished PCB design in progress, will be finish in next few days PCBs expected at the beginning of June

22. Faculty of Physics, University of Belgrade Collaboration meeting, Budapest, 15.05.2012. Page 22 out of 23 Jovan Puzović, Belgrade SHINE team Conclusion First working modules (without HV monitoring) expected for mid of July (needed in case of emergency) Full functionality at the beginning of September ToF-L/R readout upgrade have to be discuss!

23. Faculty of Physics, University of Belgrade Collaboration meeting, Budapest, 15.05.2012. Page 23 out of 23 Jovan Puzović, Belgrade SHINE team THE END