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HIGH VOLTAGE POWER SUPPLY SYSTEM FOR CMS FORWARD SUBDETECTOR

HIGH VOLTAGE POWER SUPPLY SYSTEM FOR CMS FORWARD SUBDETECTOR. Lubomir Dimitrov, Ivan Vankov Nuclear Electronics Laboratory, Institute for Nuclear Research and Nuclear Energy, BAS. I. Vankov ET 2004, Sozopol, Sept. 2004. HV PSS for HF.

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HIGH VOLTAGE POWER SUPPLY SYSTEM FOR CMS FORWARD SUBDETECTOR

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  1. HIGH VOLTAGE POWER SUPPLY SYSTEM FOR CMS FORWARD SUBDETECTOR Lubomir Dimitrov, Ivan Vankov Nuclear Electronics Laboratory, Institute for Nuclear Research and Nuclear Energy, BAS I. Vankov ET 2004, Sozopol, Sept. 2004

  2. HV PSS for HF I. Vankov ET 2004, Sozopol, Sept. 2004

  3. HV PSS for HF LHC TUNNEL I. Vankov ET 2004, Sozopol, Sept. 2004

  4. HE HB HF1 HF2 HV PSS for HF Compact Muon Solenoid (CMS) I. Vankov ET 2004, Sozopol, Sept. 2004

  5. HV PSS for HF VERY FORWARD HADRON CALORIMETER (HF) Copper Block Cherenkov Detectors – Embedded Quartz Fibers 1728 Photomultiplyers (PMTs) Type Hamamatsu R7525 (8 stages: 7 dynodes + anode) I. Vankov ET 2004, Sozopol, Sept. 2004

  6. HV PSS for HF PROBLEMS CLASSIC SOLUTION: INDIVIDUAL RESISTOR DIVIDERS – GENERATE ALL PMT VOLTAGES, BUT: 1. NEED 1728 HIGH VOLTAGE CHANNELS and 1728 165 m long HV CABLES - VERY EXPENSIVE 2. LARGE SPACE FOR THE 1728 DIVIDERS 3. GREAT POWER LOSSES IN THE DIVIDERS – PRODUCE MUCH HEAT I. Vankov ET 2004, Sozopol, Sept. 2004

  7. HV PSS for HF SYSTEM CONSTRUCTION 72 READ OUT BOXES (ROBOXES) – 36 for HF1 and 36 for HF2 36 roboxes – divided to 4 group of 9 corresponding to the four HF quadrants IN EACH ROBOX – 3 PRINTED CIRCUIT BOARDS (PCBs) AT EACH PCB – 8 PMTs (with similar parameters) I. Vankov ET 2004, Sozopol, Sept. 2004

  8. UK K K K A D1 D1 D1 A A B B B D2 D2 D2 ID50 μA P M T No 1 P M T No 2 P M T No 8 C D3 D3 D3 C C D D4 D4 D4 D D E D5 D5 D5 E E F D6 F D6 F D6 UD7 D7 D7 D7 UD8 D8 D8 D8 A A A LG S S S HV PSS for HF PRINTED CIRCUIT BOARD DIAGRAM I. Vankov ET 2004, Sozopol, Sept. 2004

  9. HV PSS for HF PRINTED BOARD CIRCUIT WITH 8 PMTs ONE RESISTOR DIVIDER FOR THE FIRST 6 DYNODES WITH TOTAL RESISTANCE ABOUT 20 Mohms – MAX. CURRENT < 50 uA THREE SUPPLY VOLTAGES: UK = 2000 V; UD7 = 800 V; UD8 = 400 V RESULTS: STABLE VOLTAGE TO D7 AND D8 VERY LOW POWER LOSSES I. Vankov ET 2004, Sozopol, Sept. 2004

  10. HV PSS for HF ONE QUADRANT HV SYSTEM STRUCTURE HV MODULE No 1 ROBOX No 1 3 PCs x 8 PMTs 1 HV cable L150 m 9 HV cables L15 m PS1 U UK,1 UK,1 UD7,1 Cable No 1 UD7,1 UD8,1 LG UD8,1 Cable No 2 U UK,2 UD7,2 LG UD8,2 PS2 LG UK,2 Cable No 9 U UK,3 UD7,2 UD7,3 UD8,3 UD8,2 9 HV CHANNELS = 1 MODULE 1 CHANNEL SUPPLIES 9 PCBs 3 GROUPS OF 72 PMTs WITH SIMILAR PARAMETERS 1x12 WIRES 150 m HV CABLE 2x2 WIRES 15 m CABLES LG LG PS3 ROBOX No 2 UK,3 UD7,3 UD8,3 ROBOX No 9 LG I. Vankov ET 2004, Sozopol, Sept. 2004

  11. PARAMETER CHANNELS 1, 4, 7 CHANNELS 2, 5, 8 CHANNELS 3, 6, 9 Max. output voltage, V 2000 800 400 Voltage resolution step, V 1 1 1 Output ripple, mVP-P 300 300 300 Floating output Yes Yes yes Max output current, mA 0,5 0,5 0,5 Long tem stability, % <0,1 <0,1 <0,1 HV PSS for HF HV CHANNELS PARAMETERS I. Vankov ET 2004, Sozopol, Sept. 2004

  12. HV PSS for HF • CONCLUSIONS • HV SYSTEM NEW SOLUTION: • PMTs united in groups with similar parameters; • Only first 6 dynodes supplied by resistor divider, D7 and D8 – from individual HV channels; • 9 PCBs (72 PMTs) connected to each HV channel. • 2. ACHIEVED RESULTS: • Drastically decreasing of numbers of the long HV cables – 8 instead of 144; • Decreasing of the power losses and heating • Drastically decreasing of the expenses I. Vankov ET 2004, Sozopol, Sept. 2004

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