HIGH VOLTAGE POWER SUPPLY SYSTEM FOR CMS FORWARD SUBDETECTOR
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HIGH VOLTAGE POWER SUPPLY SYSTEM FOR CMS FORWARD SUBDETECTOR
Lubomir Dimitrov, Ivan VankovNuclear Electronics Laboratory, Institute for Nuclear Research
and Nuclear Energy, BAS
I. Vankov ET 2004, Sozopol, Sept. 2004
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HV PSS for HF
I. Vankov ET 2004, Sozopol, Sept. 2004
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HV PSS for HFLHC TUNNEL
I. Vankov ET 2004, Sozopol, Sept. 2004
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Compact Muon Solenoid (CMS)
HV PSS for HF
HE HB
HF2HF1
I. Vankov ET 2004, Sozopol, Sept. 2004
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HV PSS for HF
I. Vankov ET 2004, Sozopol, Sept. 2004
VERY FORWARD HADRON CALORIMETER (HF)
Copper Block
Cherenkov Detectors –
Embedded Quartz Fibers
1728 Photomultiplyers (PMTs)
Type Hamamatsu R7525
(8 stages: 7 dynodes + anode)
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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
HV PSS for HF
I. Vankov ET 2004, Sozopol, Sept. 2004
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I. Vankov ET 2004, Sozopol, Sept. 2004
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)
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HV PSS for HF
I. Vankov ET 2004, Sozopol, Sept. 2004
D1
D2
K
D3
D4
D5
D6
D7
D8
A
S
ID50 μA
D1
D2
K
D3
D4
D5
D6
D7
D8
A
S
A
B
C
D
E
F
A
B
C
D
F
E
D1
D2
K
D3
D4
D5
D6
D7
D8
A
S
A
B
C
D
F
E
PMT
No1
PMT
No2
PMT
No8
LG
UK
UD7
UD8
PRINTED CIRCUIT BOARD DIAGRAM
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HV PSS for HF
I. Vankov ET 2004, Sozopol, Sept. 2004
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
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HV PSS for HF
I. Vankov ET 2004, Sozopol, Sept. 2004
ONE QUADRANT HV SYSTEM STRUCTURE
PS3
PS2
PS1
ROBOX No 13 PCs x 8
PMTs
Cable No 1
Cable No 2
Cable No 9
9 HV cablesL15 m
1 HV cableL150 m
ROBOX No 2
ROBOX No 9
HV MODULE No 1
UUD7,1
LG
UD8,1
UK,1
UUD7,2
LG
UD8,2
UK,2
UD7,2
LG
UD8,2
UK,2
UD7,1
LG
UD8,1
UK,1
UD7,3
LG
UD8,3
UK,3
UUD7,3
LG
UD8,3
UK,3
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
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HV PSS for HF
I. Vankov ET 2004, Sozopol, Sept. 2004
HV CHANNELS PARAMETERSPARAMETER CHANNELS
1, 4, 7CHANNELS
2, 5, 8CHANNELS
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
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HV PSS for HF
I. Vankov ET 2004, Sozopol, Sept. 2004
CONCLUSIONS
1. 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