I. Vankov, NEC’2003, September ‘03, Varna HV PS System NEC’2003, September 03, VARNA CMS HCAL...

I. Vankov, NEC’2003, September ‘03, Varna

HV PS System

NEC’2003, September 03, VARNA

CMS HCAL High Voltage Power Supply System

Dimitrov L.(*), Kunov B.(*), Sergeev S.(**), Vankov I.(*)

(*) INRNE, BAS, Sofia, (**) FNAL,USA/JINR,Dubna


HV PS System

Compact Muon Solenoid (CMS) - detector of

The Large Hadron Collider (LHC) in CERN

CMS Hadron Calorimeter (HCAL) consists of 50 mm brass plates with thin plastic

scintillators between them

Light collection is provided by wave length shifting fibers


HV PS System

HCAL Photodetectors - Proximity Focused Hybrid Photo Diodes (HPDs)

Photocathode p-i-n diodeUHV ~ 10 kV

UBIAS ~ 100 V

Operate in high magnetic field – to 3 Tesla

In all HCAL about 500 HPDs

19 pixels


HV PS System

500-channel PS system

22 6U Eurocrates

125 HV Modules

HV Module – 4 HV and

4 BV channels

SDLP unit – 5 LEDs and4 trims – UHLIM, IHLIM,

UBLIM, IBLIM

Crate Power Supply:

48 V, UBLIM+10 V, 5 V +8 V, -8 V

UBLIM

(RS485)

HOSTPC

220 VCRATE POWER

SUPPLY

CRATE CONTROLLER

MODULE 1(4-CHANNEL HV AND

BIAS VOLTAGEPOWER SUPPLY)

BV1HV1BV2HV2

BV6HV6

STATUS DISPLAY

AND LIMITSPRESETTING





BV1HV1BV2HV2

BV6HV6

HBV1HV1BV2HV2

BV6HV6

Fig. 1. The HV system Crate block diagram.

CRATE

LOKAL

BUS


HV PS SystemCrate Controller:

• information exchange between the host computer and the crate via RS485 interface;

• controls the Power Supply modules using custom backplane interface;

• high and bias voltages setting – from the host computer;

• polling of all voltage and current output values as well as the voltage and current limit values;

• controls all crate supply voltages and gives alarm.


HV PS System

INTERLOCK

MULTIPLEXER

ADC

LOCAL MODULECONTROL

Fig. 2. Power Supply module block diagram

CRATE

LOKAL

BUS

DACHV1

HV CHANNEL 1

CMP

DACHV4

HV CHANNEL 4 CMP

DACBV1

BV CHANNEL 1 CMP

DACBV4

BV CHANNEL 4 CMP

INTLLED

HV CHANNEL - DC-DC converter – 0 - 14 kV

BV CHANNEL – Linear stabilizer 0 - 200 V

CMP – overvoltage and overcurrent control

DAC – voltage setting

MPX+ADC – voltage and current measurement

INTERLOCK – HV line integrity control


HV PS System

RES

IBLIM

I

UBLIM

IHLIM

UHLIM

CPU CONTROL LOGIC

STATUS DISPLAY ANDLIMITS PRESETTING

ON

UTRIP

ITRIP

CPSTEMP

A[13..15]

A[8..12] D[0..7]

RxD TxD

A[13..15] A[0..7]

D[0..7]

CNTRL[0..3]

KILL KILL

TxD RxD

INTERFACERS485 OUT

RS485 IN

Fig. 3. Crate Controller and Status display and Limits Presetting block diagram

ST

MD[0..3]

CLK

D-WR

D-RD

MEMORY

CNTR[0..3]

D[0..7]

A[0..12]

S[0]

MD[0..3]CLKD-WR

RES

D-RD

CPU - Intel single chip microcomputer (I 8031)

RS 485 Interface with host computer

CONTROL LOGIC – data exchange with

modules

MEMORY – stores all data – for Host

KILL – high priority external command


HV PS System

Status Display LEDs· ON (green) – when it is dark all channels in the crate

are off; when it is light the output voltage of all set channels are established;

· UTRIP (red) – at least overvoltage in one channel is

registered;· ITRIP (red) – at least overcurrent in one channel is

registered;· CPS (red) – at least one of the crate power supply

voltage values is out of range.· TEMP (red) – the inside temperature of the crate is

above 50 0C.


HV PS System

Status parameters displayed by the Host

For each channel: on/off, ready, up/down, voltage fault, overvoltage, overcurrent

For each module: on/off, overvoltage in any channel, over- curent in any channel, in any

channel, activated interlock

For each module: on/off, overvoltage, overcurrent, voltage fault, activated interlock in any module and others


HV PS System

Engineer’s Monitoring

tool

Client

HV server

DIM Item

display

DIM

S

erve

r Power supply

Hardware

HW Emulator

Monitoring tool

Client

RS 485 DIM

HCAL Detector Control

System

Alarming

Client

Browser

Clie

nt

Hardware Server Clients

DIM Browser

Client

Arc

hiv

ing

ASCII file archive

Clie

nt

Fig. 4. The Power Supply System control program package.

PROGRAM PACKAGE:

Client/Server architecture

INTERFACE - Distributed Information

Manager (DIM)

PACKAGE PROGRAMS:

Server programs

Client programs

Debugging tools


HV PS System

SERVER – up to 8 RS485 interfaces

SERVER PROGRAMS:

1. Tools to set/retrieve the Power Supply system hardware configuration.

2. Tools to set and check serial ports.

3. Facilities to set DIM items names and alias names for a higher level monitoring system.

4. Publishing of the control information via DIM protocol.

5. Viewing of the published information for the debugging purposes.


HV PS SystemCLIENT PROGRAMS:

Control and monitor the Power Supply System (see fig. 5).

Data recording tool – data archiving.

Alarming program – acoustic signals

ARCHIVE BROWSER

DEBUGGING TOOLS:

Hardware emulator – for checking RS485.

DIM information browser.


HV PS System

Fig. 5. The main window of the Power Supply System monitoring tool.

The server works under any Windows OS of Windows NT clone

Clients works at different computers with Linux or

Windows OS

HCAL HV power supply system will be integrated in the HCAL Detector Control System (DCS) based on the PVSS II Supervisory Con-trol And Data Acquisition

System toolkit.


HV PS System

Max operating voltage, V 12000 200Max test voltage, V 14000 200Voltage resolution step, V 4 0,05Voltage ripple, mV p-p 100 1Ramp rate, V/s 0 – 1000 0 - 100Long term stability, % 0,1 0,1Voltage monitoring accuracy, % 1 1Max output current, uA 40 10Current monitoring accuracy, % 1 1Special Floating output

Parameter High voltage Bias voltage


HV PS System

THANK YOU FOR THE ATTENTION

I. Vankov, NEC’2003, September ‘03, Varna HV PS System NEC’2003, September 03, VARNA CMS HCAL...

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