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PHOTOMULTIPLIER HIGH VOLTAGE
POWER SUPPLY SYSTEM FOR THE
CMS FORWARD HADRON
CALORIMETER
Lubomir Dimitrov, Ivan Vankov
Nuclear Electronics Laboratory, Institute for Nuclear
Research and Nuclear Energy, BAS
Serguei Sergeev
Fermi National Laboratory, USA/Joint Institute for
Nuclear Research, Dubna, Russia
I. Vankov
NEC’2005, Varna, Sept. 2005
PMT HV PSS for HF
1.
2.
3.
4.
INTRODUCTION.
POWER SUPPLY SYSTEM
HV POWER SUPPLY MODULE
CRATE CONTROLLER MODULE AND
MONITOR AND CONTROL UNIT
5. POWER SUPPLY SYSTEM SOFTWARE
6. BASIC TECHNICAL PARAMETERS
7. CONCLUSIONS
I. Vankov
NEC’2005, Varna, Sept. 2005
PMT HV PSS for HF - INTRODUCTION 1
Compact Muon Solenoid (CMS)
HE
HF1
I. Vankov
HB
HF2
NEC’2005, Varna, Sept. 2005
PMT HV PSS for HF - INTRODUCTION 2
FORWARD HADRON CALORIMETER (HF)
Copper Block
Cerenkov Detectors –
Embedded Quartz Fibers
1728 Photomultiplyers (PMTs)
Type Hamamatsu R7525
(8 dynodes)
I. Vankov
NEC’2005, Varna, Sept. 2005
PMT HV PSS for HF - INTRODUCTION 3
PROBLEMS
CLASSIC SOLUTION: INDIVIDUAL RESISTOR
DIVIDERS – GENERATE ALL PMT DYNODE
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
NEC’2005, Varna, Sept. 2005
PMT HV PSS for HF - INTRODUCTION 4
SPECIFIC SYSTEM STRUCTURE
proposed by Dr. David Winn from Fairfield University
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) WITH 8 PMTs
HAVING VERY SIMILAR GAIN/VOLTAGE
I. Vankov
NEC’2005, Varna, Sept. 2005
PMT HV PSS for HF - INTRODUCTION 5
PRINTED CIRCUIT BOARD DIAGRAM
UK
A
B
ID50 μA
C
D
E
F
K
K
K
D1
A
D1
A
D1
D2
B
D2
B
D2
C
D3
C
D3
D
D4
D
D4
D5
E
D5
E
D5
D6
F
D6
F
D6
D3
D4
P
M
T
No
1
P
M
T
No
2
P
M
T
No
8
UD7
D7
UD8
D7
D8
D7
D8
D8
A
A
A
S
S
S
LG
I. Vankov
NEC’2005, Varna, Sept. 2005
PMT HV PSS for HF - INTRODUCTION 6
PRINTED CIRCUIT BOARD 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
NEC’2005, Varna, Sept. 2005
PMT HV PSS for HF - INTRODUCTION 6
HV MODULE
No 1
PS1
ONE QUADRANT HV SYSTEM STRUCTURE
1 HV cable
L150 m
9 HV cables
L15 m
U
U K,1
UD7,1
UD8,1
LG
UK,1
Cable No 1
UD7,1
UD8,1
Cable No 2
U
U K,2
UD7,2
UD8,2
LG
Cable No 9
U
U K,3
UD7,3
UD8,3
LG
LG
PS2
UK,2
UD7,2
UD8,2
9 HV CHANNELS = 1 MODULE
LG
ROBOX No 1
3 PCs x 8
PMTs
1 CLUSTER SUPPLIES 9 PCBs
PS3
UK,3
UD7,3
UD8,3
3 GROUPS OF 72 PMTs WITH
SIMILAR PARAMETERS
1x9 HV WIRES 165 m CABLE
9x9 HV WIRES 15 m CABLES
ROBOX No 2
ROBOX No 9
LG
I. Vankov
NEC’2005, Varna, Sept. 2005
PMT HV PSS for HF – CRATE DIAGRAM
220 V
HOST
PC
CRATE POWER
SUPPLY
CRATE
CONTROLLER
RS485
MONITOR
AND CONTROL
UNIT
HV POWER
SUPPLY
MODULE 1
C
R
A
T
E
L
O
C
A
L
HV POWER
SUPPLY
MODULE 2
A1
A2
A3
B1
B2
B3
C1
C2
C3
4 HV POWER SUPPLY MODULES
3 HV CLUSTERS A, B, C
CRATE CONTROLLER MODULE
RS 485 – CRATE LOCAL BUS
MONITOR AND CONTROL UNIT
7 LEDs – SYSTEM STATUS
4 LIMITS – Uklim, Ilim1, Ilim2, Ilim3
B
U
S
HV POWER
SUPPLY
MODULE 4
I. Vankov
A1
A2
A3
B1
B2
B3
C1
C2
C3
A1
A2
A3
B1
B2
B3
C1
C2
C3
CRATE POWER SUPPLY
+5 V, +8 V, -8 V, +40 V
NEC’2005, Varna, Sept. 2005
PMT HV PSS for HF – CRATE PHOTO
I. Vankov
NEC’2005, Varna, Sept. 2005
PMT HV PSS for HF – HV MODULE 1
A1, B1, C1 – 0 to 2000 V
A2, B2, C2 – 0 to 800 V
A3, B3, C3 – 0 to 400 V
FLOATING OUTPUTS
ONE CHANNEL:
DAC – HV SET VALUE
DC-DC CONVERTER
2 CMPs – U and I
LOCAL CONTROL
MUX+12 bits ADC
INTERLOCK
LED CONTROL
I. Vankov
NEC’2005, Varna, Sept. 2005
PMT HV PSS for HF – HV MODULE 2
I. Vankov
NEC’2005, Varna, Sept. 2005
PMT HV PSS for HF – CONTROL & DISPLAY
CONTROL LOGIC
CPU
A[13..15]
A[13..
A[8..12]
A[0..7]
15 ]
S T
MD[0..3]
D[0..7]
D[0..7]
CLK
D - WR
RxD
TxD
CNTRL[0..3]
D - RD
RES
KILL
KILL
MONITOR AND
INTERFACE
RS485 INTERFACE WITH
HOST COMPUTER
CRATE LOCAL BUS +
CUSTOM PROTOCOL
7 LEDS – STATUS OF
THE SYSTEM
4 POTENTIOMETERS –
U and I LIMIT VALUES
CONTROL UNIT
RS485 OUT
TxD
POWER ON
S[0]
RxD
CHANNEL ON
MD[0..3]
VOLTAGE PROT
RS485 IN
CURRENT PROT
OVER HEAT
MEMORY
CLK
D - WR
D-RD
INTERLOCK
A[0..12]
D[0..7]
CNTR[0..3]
POWER FAILURE
RES
U
I
I
I
Klim
lim1
lim2
lim3
A NEW FIRMWARE HAS
BEEN DEVELOPED WHICH
IS NOW CAPABLE TO
CONTROL BOTH HCAL
AND HF PS SYSTEM
RECOGNIZING THE
DIFFERENT TYPE OF
MODULES BY THEIR
UNIQUE ID NUMBER.
Fig. 8. Crate controller module with the monitor and control unit block diagram.
I. Vankov
NEC’2005, Varna, Sept. 2005
PMT HV PSS for HF – SOFTWARE
VERY SIMILAR TO THE HPD
POWER SUPPLY SYSTEM
MAIN MONITOR WINDOW
NINE CHANNELS STATUS
LIMIT VALUES
VOLTAGE
UP/DOWN RATES
CRATE PS VOLTAGES
MODULE STATUS
I. Vankov
NEC’2005, Varna, Sept. 2005
HV PSS for HF - PARAMETERS
CHANNELS
CHANNELS
CHANNELS
PARAMETER
A1,B1,C1
A2,B2,C2
A3,B3,C3
Max. operating voltage, V
Voltage adjustment step, V
Ramp rate, V/s
Voltage ripple, mVp-p
Voltage monitoring inaccuracy, %
Long term instability, %
Max. output current, mA
Current monitoring inaccuracy, %
Special
2000
0.5
5 – 500
100
< 0,1
< 0,1
0,8
<1
Floating
output
800
0.2
2 – 200
40
< 0,1
< 0,1
0,8
<1
Floating
output
400
0.1
1 – 100
20
< 0,1
< 0,1
0,8
<1
Floating
Output
I. Vankov
NEC’2005, Varna, Sept. 2005
HV PSS for HF
CONCLUSIONS
HV SYSTEM FOR HF PHOTODETECTORS OF
2 CRATES WITH 4 HV MODULES
DESIGNED AND PRODUCED
LONG TERM TEST CONFIRMED
THE BASIC SYSTEM PARAMETERS
ITS RELIABILITY
I. Vankov
AND
NEC’2005, Varna, Sept. 2005