Dr. Sjuts Optotechnik GmbH - Channel electron multipliers and complete measurement systems

Introduction
MEASAR software & film
MEASAR solo for use of a single CEM
MEASAR minus for use of several CEMs
MEASAR minus for use of a CEM array
MEASAR plus for use of several CEMs
MEASAR plus for use of a CEM array

Preamplifier PAD01S
Preamplifier PAD06DS

Mounting
Electrical Connections
Vacuum baking
Storage of CEMs
CEM cleaning

Standard CEMs
Extended Dynamic Range CEMs
CEMs for Space Application
Custom design CEMs
CEM Arrays

History
Principles of Operation
Structure and Fabrication

Burn-in procedure
Gain characteristic
Maximum count rate
Pulse height distribution
Dark count rate
CEM lifetime
Quantum efficiencies

This preamplifier/discriminator is designed for processing fast output pulses from electron multipliers up to very high count rates. The dead time is rate-independend, stable, and selectable in six steps in order to suppress multiple pulses and to allow for a precise dead time correction. The threshold is set with thumwheel switches in 100 steps. In addition to the pulse output a ratemeter output is provided, which may be used for monitoring purposes or triggering protective circuitry. The PAD06DS is housed in an RF-shielded aluminium case. Each unit is delivered with an individual measurement report.

Case
Aluminium (RF-shielded)		mm	113 x 61 x 31
Output to be connected to
Electronic counter
Input signal (negative pulse)
Amplitude into 50 Ohm		mV	- 3 to - 200
Safe operating without damage		V	+/- 2
Pulse width (FWHM)		ns	5 to 30
Count rate (Poission distribution)		cps	up to 2 x 10e6
Resistance, dc-coupled		Ohm	50
Threshold, adjustable in 256 steps		mV	- 3 to 130.5
Output signal (positive pulse)
Resistance		Ohm	50
Amplitude into open circuit		V	3.2
Amplitude into 50 Ohm		V	1.5
Pulse width		ns	~0.5 x (dead time)
Dead time switch selectable in six steps		ns	10 - 20 - 30 - 40 - 50 - 60
initial accuracy		ns	+/- 2 or +/- 5 % whichever is greater
initial accuracy		ns	+/- 2 or +/- 5 % whichever is greater
Stability over temperature		%	+/- 2
Ratemeter output 0 to full scale for rates		cps	0 to 10e6
	accuracy	%	5
Full scale to be specified with order
	positive	V	2 or 4
	negative	V	2 or 4
Power Supply
Power supply (no signal, no load)		V	+6 (+5.4 to -8), 60 mA typ.
		V	- 6 (-5.4 to -8), 30 mA typ.
Temperature range
For specified data		°C	10 - 40
For operation		°C	0 - 50