Thekrytron is acold-cathodegas-filled tube intended for use as a very high-speedswitch, somewhat similar to thethyratron. It consists of a sealed glass tube with fourelectrodes. A small triggering pulse on thegrid electrode switches the tube on, allowing a large current to flow between thecathode andanode electrodes. The vacuum version is called avacuum krytron, orsprytron. The krytron was one of the earliest developments of theEG&G Corporation.
Unlike most other gas switching tubes, the krytron conducts by means of anarc discharge, to handle very high voltages and currents (reaching several kilovolts and several kiloamperes), rather than the low-currentglow discharge used in otherthyratrons. The krytron is a development of thetriggered spark gaps andthyratrons originally developed forradar transmitters duringWorld War II.
The gas used in krytrons ishydrogen;[2]noble gases (usuallykrypton), or aPenning mixture can also be used.[3]
A krytron has fourelectrodes. Two are a conventionalanode andcathode. One is a keep-alive electrode, placed near the cathode. The keep-alive has a low positive voltage applied, which causes a small area of gas to ionize near the cathode. High voltage is applied to the anode, but primary conduction does not occur until a positive pulse is applied to the trigger electrode ("Grid" in the image above). Once started, arc conduction carries a considerable current.
The fourth is a control grid, usually wrapped around the anode, except for a small opening on its top.[4]
In place of or in addition to the keep-alive electrode some krytrons may contain a tiny amount of radioactive material (usually less than 5microcuries (180 kBq) ofnickel-63), which emitsbeta particles (high-speedelectrons) to makeionization easier. The radiation source serves to increase the reliability of ignition and formation of the keep-alive electrode discharge.
The gas filling provides ions for neutralizing thespace charge and allowing high currents at lower voltage.[4] The keep-alive discharge populates the gas with ions, forming a preionized plasma. This can shorten the arc formation time by 3–4 orders of magnitude in comparison with non-preionized tubes, as time does not have to be spent on ionizing the medium during formation of the arc path.[5]
The electric arc is self-sustaining. Once the tube is triggered, it conducts until the arc is interrupted by the current falling too low for too long (under 10 milliamperes for more than 100 microseconds for the KN22 krytrons).[2]
Krytrons and sprytrons are triggered by a high voltage from acapacitor discharge via a triggertransformer, in a similar wayflashtubes for e.g.photoflash applications are triggered. Devices integrating a krytron with a trigger transformer are available.[5]
Asprytron, also known asvacuum krytron ortriggered vacuum switch (TVS), is a vacuum, rather than a gas-filled, version. It is designed for use in environments with high levels ofionizing radiation, which might trigger a gas-filled krytron spuriously. It is also more immune to electromagnetic interference than gas-filled tubes.
Sprytrons lack the keep alive electrode and the preionization radioactive source. The trigger pulse must be stronger than for a krytron. Sprytrons are able to handle higher currents. Krytrons tend to be used for triggering a secondary switch, e.g., atriggered spark gap, while sprytrons are usually connected directly to the load.
The trigger pulse has to be much more intense, as there is no preionized gas path for the electric current, and avacuum arc must form between the cathode and anode. An arc first forms between the cathode and the grid, then a breakdown occurs between the cathode–grid conductive region and the anode.[5]
Sprytrons are evacuated tohard vacuum, typically 0.001Pa. Askovar and other metals are somewhat permeable to hydrogen, especially during the 600 °Cbake-out before evacuation and sealing, all external metal surfaces must be plated with a thick (25 microns or more) layer of softgold. The same metallization is used for other switch tubes as well.[6]
Sprytrons are often designed similar totrigatrons, with the trigger electrode coaxial to the cathode. In one design the trigger electrode is formed as metallization on the inner surface of analumina tube. The trigger pulse causes surfaceflashover, which liberates electrons and vaporized surface discharge material into the inter-electrode gap, which facilitates formation of avacuum arc, closing the switch. The short switching time suggests electrons from the trigger discharge and the correspondingsecondary electrons knocked from the anode as the initiation of the switching operation; the vaporized material travels too slowly through the gap to play significant role. The repeatability of the triggering can be improved by special coating of the surface between the trigger electrode and the cathode, and thejitter can be improved by doping the trigger substrate and modifying the trigger probe structures. Sprytrons can degrade in storage, byoutgassing from their components, diffusion of gases (especially hydrogen) through the metal components, and gas leaks through thehermetic seals. An example tube manufactured with internal pressure of 0.001 Pa will exhibit spontaneous gap breakdowns when the pressure inside rises to 1 Pa. Accelerated testing of storage life can be done by storing in increased ambient pressure, optionally with added helium for leak testing, and increased temperature storage (150 °C) for outgassing testing. Sprytrons can be made miniaturized and rugged.[7]
Sprytrons can be also triggered by alaser pulse. In 1999 the laser pulse energy needed to trigger a sprytron was reduced to 10 microjoules.[8]
Sprytrons are usually manufactured as rugged metal/ceramic parts. They typically have lowinductance (10 nanohenries) and low electrical resistance when switched on (10–30 milliohms). After triggering, just before the sprytron switches fully on in avalanche mode, it briefly becomes slightly conductive (carrying 100–200 amperes); high-powerMOSFET transistors operating in avalanche mode show similar behavior.SPICE models for sprytrons are available.[9]
This design, dating from the late 1940s, is still capable of pulse-power performance that even the most advanced semiconductors (evenIGBTs) cannot match easily. Krytrons and sprytrons are capable of handling high-current high-voltage pulses, with very fast switching times, and constant, lowjitter time delay between application of the trigger pulse and switching on.
Krytrons can switch currents of up to about 3000 amperes and voltages up to about 5000 volts. Commutation time of less than 1 nanosecond can be achieved, with a delay between the application of the trigger pulse and switching as low as about 30 nanoseconds. The achievablejitter may be below 5 nanoseconds. The required trigger pulse voltage is about 200–2000 volts; higher voltages decrease the switching delay to some degree. Commutation time can be somewhat shortened by increasing the trigger pulse rise time. A given krytron tube will give very consistent performance to identical trigger pulses (low jitter).[5] The keep-alive current ranges from tens to hundreds of microamperes. The pulse repetition rate can range from one per minute to tens of thousands per minute.[4]
Switching performance is largely independent of the environment (temperature, acceleration, vibration, etc.). However, the formation of the keep-alive glow discharge is more sensitive, which necessitates the use of a radioactive source to aid its ignition.
Krytrons have a limited lifetime, ranging, according to type, typically from tens of thousands to tens of millions of switching operations, and sometimes only a few hundreds.[4][5]
Sprytrons have somewhat faster switching times than krytrons.
Hydrogen-filled thyratrons may be used as a replacement in some applications.
Krytrons and their variations are manufactured byPerkin-Elmer Components and used in a variety of industrial and military devices. They are best known for their use in ignitingexploding-bridgewire andslapper detonators innuclear weapons, their original application, either directly (sprytrons are usually used for this) or by triggering higher-powerspark gap switches. They are also used to triggerthyratrons, largeflashlamps inphotocopiers,lasers and scientific apparatus, and for firing ignitors for industrialexplosives.
Because of their potential for use as triggers of nuclear weapons, the export of krytrons is tightlyregulated in the United States. A number of cases involving thesmuggling or attempted smuggling of krytrons have been reported, as countries seeking to develop nuclear weapons have attempted to procure supplies of krytrons for igniting their weapons. One prominent case was that ofRichard Kelly Smyth, who allegedly helpedArnon Milchan smuggle 15 orders of 810 krytrons total to Israel in the early 1980s.[10] 469 of these were returned to the United States, with Israel claiming the remaining 341 were "destroyed in testing".[10]
Krytrons and sprytrons handling voltages of 2,500 V and above, currents of 100 A and above, and switching delays of under 10 microseconds are typically suitable for nuclear weapon triggers.[11]
A krytron was the "MacGuffin" in Roman Polanski's 1988 filmFrantic. The device in the film was actually a Krytron-Pac, which consisted of a Krytron tube along with a trigger transformer encased in black epoxy.[12]
The plot ofLarry Collins' bookThe Road to Armageddon revolved heavily around American-made krytrons that Iranian mullahs wanted for three Russian nuclear artillery shells they had hoped to upgrade to full nuclear weapons.[13]
Optically triggered solid-state switches based ondiamond are a potential candidate for krytron replacement.[14]
CBS/Hytronsecond source documentation: