Channel photomultipliers represent a new head-on monolithic design that incorporates a unique detector having a semitransparent photocathode deposited onto the inner surface of the entrance window.
Tutorial Details:
The photomultiplier features similar functionality to conventional units, but with dramatically increased sensitivity and high quantum efficiency. Individual photoelectrons released by the photocathode enter a narrow and curved semiconductive channel that serves in place of the traditional dynode chain. Each time an electron impacts an inner wall of the channel, multiple secondary electrons are emitted. This interactive tutorial explores how electrons are multiplied within the conductive chain of a channel photomultiplier.
The tutorial initializes with a cutaway drawing of the channel photomultiplier appearing in the window, and having the photocathode oriented to the left and the anode positioned on the right. Virtual photons, represented by small yellow spheres, incident on the photocathode are converted into photoelectrons that pass into the channel entrance. In the curved channel, the electrons multiply as they impact the surface of the walls, and eventually are absorbed by the anode. In order to operate the tutorial, use the Gain slider to increase or decrease the number of electrons created each time an electron collides with the channel, and the Tutorial Speed slider to regulate the speed of the electrons passing through the photomultiplier. The tutorial can be halted at any point by clicking on the Stop button, which reverts to a Play button for resumption of the tutorial action.
The spectral response, quantum efficiency, sensitivity, and dark current of a photomultiplier are determined by the elemental composition and geometry of the photocathode. The best photocathodes capable of responding to visible light are less than 40 percent quantum efficient, meaning that at least 60 percent of the photons impacting on the photocathode do not produce a photoelectron and are therefore not detected. Photocathode thickness is an important variable that must be monitored to ensure the proper response from absorbed photons. If the photocathode is too thick, more photons will be absorbed but fewer electrons will be emitted from the back surface. However, if the photocathode is too thin, an abundance of photons may pass through without being absorbed.
Read
Tutorial at: Click here to view the tutorial
Rate Tutorial: Interactive Java Tutorials
View Tutorial: Interactive Java Tutorials
Related
Tutorials:
 JavaWorld
December 1999
JavaWorld
December 1999
|
An AI tool for the
real world
An AI tool for the
real world
|
a-visual-llk-parser-generator VisualLangLab
a-visual-llk-parser-generator: VisualLangLab
A Visual IDE-Style LL(k) Parser Generator that uses an editable tree with icons for tokens and non-terminals to represent the grammar symbols and grammar rules.
|
Java Testing and Design
Java Testing and Java Test and Design is the companion to any book on Java software development practices, techniques, and testing. Software developers, QA analysts and IT managers working in large corporate IT groups, software development companies, and
|
NIO Tutorials
NIO Tutorials
Introduction
In the words of Gregory Pierce, "NIO is one of the most important but least understood APIs that came along for the ride with JDK1.4". Couldn't have put it better myself :). The aim of this series of articles is to help you
|
Jython
Get to know Jython, in this first article in a new series introducing alternate languages for the Java Runtime Environment, alt.lang.jre. Jython is an implementation of the popular scripting language Python, but running on a JVM. For Python developers Jyt
|
JMS Messaging Online Resource
JMS Messaging Online Resource
JMS Tutorials
JMS provides a way for Java programs to access an enterprise messaging system, also known as message oriented middleware (MOM). Check out the below tutorials.
|
STRAP - Interactive alignment program for proteins
Structural Alignment Program for Proteins
Welcome to STRAP, an editor for multiple sequence alignments of proteins. The computer program STRAP supports the analysis of hundreds of proteins and integrates amino acid sequence, secondary structure, 3D-struc
|
JDemo: Interactive Testing Refactored
This article will introduce the JDemo framework and its techniques for writing code for interactive testing. It will also show the benefits that can be gained from writing demo code.
|
Excellent Guide to Java / Databases, JDBC
JDBC is a Java API for executing SQL statements. Start here, Examples Central Sites Related Sites, Link Collections Tutorials, FAQs, References Company Newsgroups Mailing Lists, General Articles, Special Articles, Interoperability Books util
|
Getting Started With the Mobile 3D Graphics API for J2ME
This tutorial introduces the Mobile 3D Graphics API for J2ME, JSR 184. The article presents an overview, potential application areas, the differences between JSR 184 and two related APIs, the classes in the new optional package, the programming model, the
|
Just Forms PDF library
The JustFormsPDF library is a Java class library for filling or editing interactive PDF forms on-the-fly. Empower your applications with the industry-standard PDF forms technology using JustFormsPDF.
|
Java Technology Tutorials and Online Training
Learn the various Java technologies from the fundamentals of the Java programming language to web services and the J2EE platform through a variety of online tutorials and training classes.
|
Welcome to Java Developers paradise!
Welcome to Java Developers paradise!
T his site contains many quality Java, JSP, RMI, MySQL downloads, tutorials, source codes and links to other java resources. We have large number of links to the tutorials on java which will help you learn java
|
Bioinformatics Tutorials, Links, Programs
Bioinformatics Tutorials, Links, Programs
Bioinformatics Tutorials
Dedicated website to Bioinformatics containing Bioinformatic Tools, Online Resource, Links to Bioinformatic Resources and Tutorials. Here you will find a lot of tutorials and
|
Collection of Large Number of Java Sample Programs and Tutorials
Collection of Large Number of Java Sample Programs and Tutorials
Collection of Large Number of Java Sample Programs and Tutorials
HelloWorld Java Program
Simple Java Program for beginners that prints HelloWorld! on console.
|
The Beginners Linux Guide
The Beginners Linux Guide
The Beginner's Guide to Linux
Dedicated website to Linux containing Online Resource, Links to Linux Resources and Tutorials. Here you will find a lot of tutorials and information about the Linux.
What is Linux?
This
|
Welcome to the MySQL Tutorials
Welcome to the MySQL Tutorials
Welcome to the MySQL Tutorials
Using MYSQL Database
This lesson is intended to provide hands an experience with MYSQL database
Backing Up and Restoring A MySQL Database
In this lession you will learn how to take
|
Connecting to MySQL database and retrieving and displaying data in JSP
page
Connecting to MySQL database and retrieving and displaying data in JSP page
Connecting to MySQL database and retrieving and displaying data in JSP page
This tutorial shows you how to connect to MySQL database and retrieve the data from the
|
WAP Toolkits Motorola - Mobile ADK 1.1 Nokia - WAP Toolkit
WAP Toolkits Motorola - Mobile ADK 1.1 Nokia - WAP Toolkit
Tutorial
WAP Toolkits
T o develop any WAP application you have to download software essential for development. Although you can write and test your codes through our site for learning
|
|
|
|
