HV-Splitter for RENO Project S. Stepanyan, 김김김 김김김김김 Y.Kim Sejong University May-2008.
HV-Splitterfor RENO Project
S. Stepanyan, 김우영경북대학교
Y.KimSejong University
May-2008.
PMT-base circuit
• A-high Potential; back terminated for large signals by 50ohm and 4.7nF cap. to ground
• K-photocathode should be kept at ground potential to avoid discharges which might be occur between K and outer envelope of the detector.
• RG303C 50 ohm cable sealed in the PMT base with SHV connector. 0.1mA divider
Eight channel HV Splitter
SHV-connectorHV-
Power SupplyUPS
Split HV to 8PMT
Eight -channel HV
Splitter prototypeS.S-2008
LEMOconnector
8-SHV-Connectors
Mockup-Detector
Cable coaxialRG-303
Front-End
Module
Pulses fromPMT1-PMT8
Out pulsesPMT1-PMT8
DifferentiatingEffect of HV
Blockingcapacitance
C1/4.7nF,3KV
C8/4.7nF,3KV
10K
100K 1%
C9/4.7nF 3KV
49.9K 1%
Zener Diode
Mainframe(crate)
Internet control for
All channel Voltages, trip
Currents,Alarms
HV SplitterBoard
HV=2.4KVPMT Current~0.3mA
I=2.4mA for HV channelP=0.0.01W for 100K
Plus Polarity
HF-Filter
High Voltage
HV Splitter Circuit
• HV PS outputs should be floating, such that crate ground is independent of the return for the HV channels.
• 100ns single cable for readout and supply of HV which minimizes the ground loops noise.
• Having termination at both PMT base and the HV splitter (100 ns cable) reduces the reflections to 1%.
HV Splitter Goals
• Expected PMT signals ~2mV which passing first through HV-splitter
• Decouple the signals coming out PMT s from the HV supplies.
• Terminate the PMT cable transmission line to minimize pulse reflections,
• Distribute HV among several PMT s per HV channel.
• Provide filtering of the HV to reduce noise comes from HV supplies .
CAEN-A1533-1534 Floating PS
CAEN-1932-48ch/500mkA-HV-PS
EMCO-8SHV-connectors-2kV-0.5mA-Output/24V/2A-Input
DC-HV-splitter-prototype
HV-Splitter with decouple-circuit
Differentiating effect of the HV blocking capacitance
50mV PS Noise on Summed PMT Signals-DC
DC to DC generator microcpip
Output Voltage dependence from DAC voltage
The HV(High Voltage) system configuration from microchips of DC to DC HV generators of EMCO or CAEN
• Model A864 provides a programmable and monitorable output voltage ranging from 0 to 2kV when supplied 12v input voltage, size 25mmmx100mmx13mm; one ch. manufacturer CAEN
• A3006 6channel 4-16V/6A/90W(per ch.) LV PS from CAEN
• A3802 128ch DAC(12bit resolution) +4V/10mA DAC(digital analog convertor)
EMCO+ CAEN with 4 additional wires to PMT base(2 input and 2 from DAC for programming control)
length of wires should be same for all PMT dividers
• . A) model CA20P-5 . DC to DC HV generator manufacturer of EMCO
• B) model CM1One ch.CA series Chassis mount kit manufacturer of EMCO.
• C) A3009 12ch 2-8V/9A/45W(per ch) manufacturer CAEN
• D) A3802 128ch DAC(12bit resolution) +4V/10mA DAC manufacturer CAEN.
AS a Day Bay proposal.
• . By using manufacturer Analog, Inc. Microcontroller ADuC845/ADuC847/ADuC848 .
• DC to DC HV generator manufacturer of EMCO. Also we should think about LV PS and should develop software of the microcontroller
End
• Thank you for Attention
Front and back panels of HV Splitter
6 mm
Ø 10
2020
Ø 4
60
300
[Mm]Floating 24 channel splitter.Front panel from plate of teflon material.
Teflon
Ø 8
15
Ø 4
60
300
[Mm]Back panel with 24 lemmo connectors.
15