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