ORTEC 264 Manuale utente

INSTRUCTION

MANUAL

264

PHOTOMULTIPLIER

TIMING

DISCRIMINATOR

AND

PREAMPLIFIER

INSTRUCTION

MANUAL

MODEL

264

PHOTOMULTIPLIER

TIMING

DISCRIMINATOR

AND

PREAMPLIFIER

Serial

No.

Purchaser

Date

Issued

BOX

OAK

RIDGE,

TENNESSEE

37830

Telephone

(615)

483-8451

TWX

810-572-1078

)

ORTEC

Incorporated

1966

Printed

U*S*A«

TABLE

CONTENTS

Page

WARRANTY

PHOTOGRAPH

DESCRIPTION

1-1

SPECIFICATIONS

2-1

INSTALLATION

INSTRUCTIONS

3-1

3.1

Det-ector

Mounting

3-1

3.2

Photomultlplier

Insertion

3-1

3.3

System

Connection

and

Initial

Adjustment

3-1

OPERATING

INSTRUCTIONS

4-1

4.1

Timing

with

Photomultipliers

4-1

4.2

Applications

4-2

CIRCUIT

DESCRIPTIONS

5-1

5.1

Voltage

Divider

Network

5-1

5.2

Linear

Preamplifier

5-1

5.3

Discriminator

Circuit

5-1

MAINTENANCE

INSTRUCTIONS

6-1

6.1

Divider

Network

6-1

6.2

Preamplifier

6-1

6.3

Fast

Crossover

Discriminator

6-1

BLOCK

DIAGRAM

AND

SCHEMATICS

264-0101-Bl

ORTEC

264

Block

Diagram

264-0101-Sl

ORTEC

264

Schematic

264-0201-Sl

ORTEC

264

Schematic

264-0301-Sl

ORTEC

264

Schematic

LIST

FIGURES

Page

Figure

Suggested

Cutaway

Drawing

—

Scinti

lator

Mounting

2-3

Figure

Incorrect

Adjustment

R-26

4-2

Figures.

Correct

Adjustment

R-26

4-2

Figure

Incorrect

Adjustment

Crossover

Zero

4-3

Figures.

Correct

Adjustment

Crossover

Zero

4-3

Figure

Simple

Sub-Nanosecond

Coincidence

System

4-6

Figure

Wide

Dynamic

Range

Timing

Spectrum

Using

"Fast"

Crossover

4-7

Figure

Narrow

Dynamic

Range

Timing

Spectrum

Using

"Fast"

Crossover

4-8

Figure

Timing

Resolution

(Leading

Edge

vs.

"Fast"

Crossover)

4-9

Figure

10.

Open

Unit

Showing

Picture

Controls

6-2

SYSTEM

BLOCK

DIAGRAMS

200058

Gamma-Ray

Pair

Spectrometer

4-10

200057

Fast

Timing

System

for

(Semiconductor

Detector-Photo-

multiplier

Tube)

Coincidence

Using

Two

Crossover

Pickoff

Techniques

4-11

200067

Associated

Particle

Neutron

Time

Flight

System

with

Energy

Selecting

Side

Channels

4-11

200068

Pulse

Shape

Discrimination

System

4-12

200056

Fast-Fast

Coincidence

(Photomultiplier

Tube)

with

Pulse

Shape

Discrimination

4-12

200060

Sub-Nanosecond

Timing

System

(Semiconductor-Photomultiplier

Tube)

4-13

STANDARD

WARRANTY

FOR

ORTEC

ELECTRONIC

INSTRUMENTS

DAMAGE

TRANSIT

Shipments

should

examined

immediately

upon

receipt

for

evidence

external

con

cealed

damage.

The

carrier

making

delivery

should

notified

immediately

any

such

damage,

since

the

carrier

normally

liable

for

damage

shipment.

Packing

materials,

waybills,

and

other

such

documentation

should

preserved

order

establish

claims.

After

such

notification

the

carrier,

notify

ORTEC

the

circumstances

that

may

assist

damage

claims

and

providing

replacement

equipment

when

necessary.

WARRANTY

ORTEC

warrants

its

electronic

products

free

from

defects

workmanship

and

materials,

other

than

vacuum

tubes

and

semiconductors,

for

period

twelve

months

from

date

ship

ment,

provided

that

the

equipment

has

been

used

proper

manner

and

not

subjected

abuse.

Repairs

replacement,

ORTEC

option,

wil

made

without

charge

the

ORTEC

factory.

Shipping

expense

will

the

account

the

customer

except

cases

defects

discovered

upon

initial

operation.

Warranties

vacuum

tubes

and

semiconductors,

made

their

manufacturers,

will

extended

our

customers

only

the

extent

the

manufacturers'

liabi

lity

ORTEC.

Specially

selected

vacuum

tubes

semiconductors

cannot

warranted.

ORTEC

reserves

the

right

modify

the

design

its

products

without

incurring

responsibility

for

modification

previously

manufactured

units.

Since

instal

lation

conditions

are

beyond

our

control,

ORTEC

does

not

assume

any

risks

liabilities

associated

with

the

methods

installation,

instal

lation

results.

QUALITY

CONTROL

Before

being

approved

for

shipment,

each

ORTEC

instrument

must

pass

stringent

set

quality

control

tests

designed

expose

any

flaws

materials

workmanship.

Permanent

records

these

tests

are

maintained

for

use

warranty

repair

and

source

statistical

information

for

design

improvements.

REPAIR

SERVICE

ORTEC

instruments

not

warranty

may

returned

the

factory

for

repairs

checkout

modest

expense

the

customer.

Standard

procedure

requires

that

returned

instruments

pass

the

same

qual

ity

control

tests

those

used

for

new

production

instruments.

Please

contact

the

factory

for

instructions

before

shipping

equipment.

P3Z

H"®"

1-1

ORTEC

264

PHOTOMULTIPLIER

TIMING

DISCRIMINATOR

AND

PREAMPLIFIER

DESCRIPTION

The

ORTEC

264

Photomultiplier

Timing

Discriminator

and

Preamplifier

consists

of:

base

structure

providing

mechanical

assembly

and

resistive

voltage

divider

network

with

appropriate

capacity

decoupling

for

the

operation

the

RCA

8575

photomultiplier

tube;

linear

preamplifier

providing

integration

and

line

drive

capability

for

the

linear

dynode

signal;

and

walk-free

timing

discriminator

that

remotely

controlled.

This

complex

designed

operate

with

fast

organic

phosphors,

e.g.,

plastic

and

fast

decay

liquid

phosphors.

may

readily

altered

accommodate

phosphors

having

fast

decay

component

time

constant

that

rel

atively

long,

i.e.,

nsec.

not

meant

for

use

with

Nal(TI)

Csl(TI).

SPECIFICATIONS

(NOTE:

All

photomultiplier

specifications

ore

given

monufocturer.)

Base

Structure:

Hi-Voltage:

Negative,

maximum

Bleeder

Current:

maximum

(last

dynodes

available

externally

for

added

stabilization

when

desired)

Controls:

Focus

electrode,

2nd

Dynode

(D2)

Connectors:

Discriminator

Output:

BNC

Preamplifier

Output;

BNC

Auxiliary;

3112E12-10S

Bendix

PT02E12-10S

Hi-Voltage:

Kings

KV-79-13;

mating

connector

KV-59-22,

compatible

with

RG-59/U

coaxial

cable,

available

accessory.

Preamplifier:

Input:

Signal

current

from

9th

dynode

Input

Impedance:

2.2M

shunted

100

Voltage

Gain

(Ay):

Output

Signal

Dynamic

Range:

lOV

open

circuit,

100

ohms

Integral

Nonlinearity:

=±0.1%

Output

Rise

Time

(Tp):

=50

nsec

Temperature

Stability:

±0.015%/°C

Output

Impedance

(Z^):

100

ohms

Power:

from

403*or

403A

Time

Pickoff

Control

Unit,

via

power

and

bias

cable

supplied.

Walk-Free

Timing

Discriminator:

Input

Signals:

Anode

Signal,

Dynode

signal

Output

Signal:

ohms,

Tp,

nsec,

width»ilO

nsec

*Refer

modification

note

403

403A.

2-2

Discriminator

Control

Range:

anode

current

(Specified

with

403A

Time

Pickoff

Control)

Pulse

Pair

Resolving

Time:

Threshold

discriminator

recovers

=5%

error

nsec

Discriminator

Temperature

Stability:

=±0.01

m^°C

(Anode

Current)

Walk

(Time

Shift

vs.

Pulsje

Height):

Typically

^±0.1

nsec

for

100:1

dynamic

range

Power:

from

403*

403A

Time

Pickoff

Control,

via

foot

cable,

264-Cl,

supplied

with

base.

The

timing

logic

signal

from

the

discriminator

output

will

normally

connect

the

input

the

403A

which

provides

fan-out

capabilities.

The

linear

signal

from

the

preamplifier

will

normally

connect

shaping

amplifier

such

the

410

435.

The

ORTEC

216

(for

AVP,

etc.)

217

(for

AVP

1040)

Magnetic

Shield

recommended

accessory

reduce

the

effect

the

earth's

magnetic

field

and

stray

fields

from

other

equipment.

Power

Required:

(From

403A):

+24V

12V

-24V-20

-12V-40

*Refer

modification

note

403

403A.

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