Shemel Tube -
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However, the search results also indicate a significant overlap with "whisker tubes," which are miniature storage tubes. To ensure this article covers all facets of the query, it is necessary to explore the commercial and specialized nature of these products.
Understanding the Shemel Tube: A Comprehensive Guide to Specialized Silicone and Prosthetic Components
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Despite its advantages, the Schamel tube faces significant challenges. First, fabrication is non-standard; most units are hand-built in university workshops (e.g., at the Max Planck Institute for Plasma Physics). Second, it requires complex, high-voltage power supplies with extremely low ripple. Third, the advent of and advanced solid-state detectors has reduced demand. MCPs offer two-dimensional imaging and higher gain, though they suffer from gain sag in magnetic fields.
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A shemel tube is typically a small, flexible silicone or plastic tube designed to be inserted into a larger, full-body silicone suit or a specialized prosthetic device (such as a passive prosthetic or a "shemale tube" or "tranny tube" device). These tubes serve a dual purpose: If your interest is in learning about: However,
The "Shemel" or Schamel tube exemplifies the spirit of specialized scientific instrumentation: a device built not for mass production, but to answer a specific experimental question that general tools cannot. Its legacy lies in enabling high-resolution measurements of plasma electron distributions, contributing to our understanding of fusion energy and astrophysical plasmas. While newer technologies have encroached on its territory, the Schamel tube remains a testament to how creative electrode design can overcome fundamental noise limits. For any plasma physicist working on the edge of a magnetically confined fusion device, the Schamel tube is not an obsolete artifact—it is a precision scalpel where a hammer will not do.
| Feature | Schamel Tube | Channel Electron Multiplier (CEM) | Channeltron | | :--- | :--- | :--- | :--- | | | (10^5 - 10^7) | (10^4 - 10^8) | (10^6 - 10^8) | | Magnetic field tolerance | High (designed for B-fields) | Low | Moderate | | Noise (ion feedback) | Very low | Moderate | High | | Lifespan in plasma | Long ((>1) year) | Short (weeks) | Moderate | | Cost | High (custom fabrication) | Low (commercial) | Moderate |
In the realm of experimental physics, the ability to detect and amplify weak signals is paramount. While photomultiplier tubes (PMTs) and channeltrons dominate commercial markets, specialized instruments like the (or Schamel electron multiplier) occupy a crucial niche. Developed by Wolfgang Schamel, this device is an electrostatic electron multiplier used primarily for detecting low-energy electrons in plasma environments, particularly in magnetic fusion research and space plasma simulation. Unlike standard devices that rely on continuous dynode structures, the Schamel tube offers a unique design that prioritizes low-noise operation and high sensitivity in cryogenic or ultra-high vacuum (UHV) conditions. Among these, the "shemel tube" or "tranny tube"
The primary application of the Schamel tube is in for measuring electron energy distribution functions (EEDFs). In a magnetized plasma, conventional probes suffer from magnetic deflection and secondary emission errors. The Schamel tube, however, can be integrated into a retarding field energy analyzer (RFEA) . By scanning the retarding voltage, the tube’s output current directly maps the velocity distribution of electrons.
The tube must fit the diameter of the prosthetic aperture. Ethical Considerations and Terminology