Ion Detector Layout With Negative Ion Barrier Protection
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Solution Overview
Problem
Existing ion detectors face the challenge of negative ions directly colliding with the scintillator, leading to potential damage, reduced light emission, and increased maintenance needs, as they are not designed to avoid such collisions effectively.
Innovation Solution
An ion detector configuration that includes a positive ion conversion dynode, a negative ion conversion dynode, a scintillator, and a negative potential barrier generation electrode, where the negative potential barrier is positioned between the ion entrance and the scintillator to redirect negative ions away from direct collision with the scintillator, ensuring they collide with the negative ion conversion dynode instead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional ion detector configuration is used, then both positive and negative ions can be detected, but negative ions directly collide with the scintillator causing damage and degradation
Solution Approach 1:
The detector is segmented into distinct functional regions: a first conversion dynode for positive ions, a second conversion dynode for negative ions, and a scintillator. This spatial segmentation ensures that negative ions are directed to the second conversion dynode rather than directly colliding with the scintillator, while positive ions are directed to the first conversion dynode.
Solution Approach 2:
A third conversion dynode is introduced as an intermediary component between the ion entrance and the scintillator. This third conversion dynode serves as a mediator that converts negative ions into electrons, which then interact with the scintillator without causing direct ion collision damage. The third conversion dynode acts as a protective intermediary that enables negative ion detection while preserving scintillator integrity.
2Productivity
If negative ions directly collide with the scintillator, then negative ion detection is achieved, but the scintillator degrades and requires frequent maintenance
Solution Approach 1:
The detection path is segmented into two separate pathways: one for positive ions through the first conversion dynode and another for negative ions through the second conversion dynode. This segmentation allows negative ions to be detected via electron conversion at the second dynode rather than direct scintillator collision, thereby extending scintillator lifespan while maintaining detection efficiency.
Solution Approach 2:
The third conversion dynode serves as an intermediary that converts negative ions to electrons before they reach the scintillator. This intermediary mechanism enables efficient negative ion detection through electron-mediated processes while preventing direct negative ion-scntillator collisions that would cause degradation and reduce lifespan.
3Measurement precision
If a conversion dynode is placed close to the scintillator for positive ion detection, then detection sensitivity is improved, but the configuration becomes asymmetric and complex
Solution Approach 1:
The detector employs an asymmetric configuration where the first conversion dynode is positioned close to the scintillator for positive ion detection, while the second conversion dynode is positioned on the opposite side for negative ion detection. This controlled asymmetry optimizes detection sensitivity for both ion types by placing conversion dynodes at strategically different positions, with the third conversion dynode mediating the negative ion pathway.
Solution Approach 2:
The third conversion dynode serves multiple functions: it acts as a conversion surface for negative ions, creates an electron cloud that mediates negative ion detection, and maintains electrical field balance in the asymmetric configuration. This multi-functional element simplifies the overall complex asymmetric structure by consolidating several roles into a single component.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively prevents direct collisions of negative ions with the scintillator, prolongs its lifespan, reduces maintenance requirements, and enables highly sensitive detection of both positive and negative ions.
Implementation Method 1
a conversion dynode which emits secondary electrons due to ion collision
Implementation Method 2
a scintillator which emits light due to the entrance of the secondary electrons emitted from the conversion dynode
Implementation Method 3
a negative potential barrier generation electrode configured to generate a negative potential barrier between the scintillator and the ion entrance
Implementation Method 4
a photodetector which detects the light emitted by the scintillator
Data Source
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Figure 2B
AI summary
The present invention implements an ion detector with which it is possible to avoid direct collisions of negative ions with a scintillator, prevent degradation of the scintillator, prolong life of the scintillator, reduce the need for maintenance, and perform highly sensitive detection of both positive and negative ions. With respect to a reference line 65 connecting a central point 63 of a positive ion CD 52 and a central point 64 of a counter electrode 54, a central point 66 of a negative ion CD 53 is provided in a region of a side opposite to a region of a side of a central point 67 of a scintillator 56. Positive ions entering from an ion entrance 62 receive a deflection force and collide with the positive ion CD 52 to generate secondary electrons. The generated secondary electrons collide with the scintillator 56 to generate light. The generated light passes through a light guide 59 and is detected by a photomultiplier tube 58. A negative potential barrier is generated along the reference line 65. Negative ions entering form the ion entrance 62 are attracted to and collide with the negative ion CD 53 to generate positive ions. The generated positive ions collide with the positive ion CD 52 to generate secondary electrons. The generated secondary electrons collide with the scintillator 56 and are detected by the photomultiplier tube 58.