Krytron

For the microwave/radio amplifying tube, seeKlystron.For the cryoelectric switch, seeCryotron.For the chemical element, seeKrypton.

KN2 "Krytron" switch tube, made byEG&G(about 25 mm tall)

Thekrytronis acold-cathodegas-filled tubeintended 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 thegridelectrode switches the tube on, allowing a large current to flow between thecathodeandanodeelectrodes. The vacuum version is called avacuum krytron,orsprytron.The krytron was one of the earliest developments of theEG&G Corporation.

Description

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 dischargeused in otherthyratrons.The krytron is a development of thetriggered spark gapsandthyratronsoriginally developed forradartransmitters duringWorld War II.

The gas used in krytrons ishydrogen;noble gases(usuallykrypton), or aPenning mixturecan also be used.

Operation

Diagram of a Krytron

A krytron has fourelectrodes.Two are a conventionalanodeandcathode.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.

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(180kBq) ofnickel-63), which emitsbeta particles(high-speedelectrons) to makeionizationeasier. 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 chargeand allowing high currents at lower voltage.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.

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).

Krytrons and sprytrons are triggered by a high voltage from acapacitordischarge via a triggertransformer,in a similar wayflashtubesfor e.g.photoflashapplications are triggered. Devices integrating a krytron with a trigger transformer are available.

Sprytron

Asprytron,also known asvacuum krytronortriggered 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 arcmust 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.

Sprytrons are evacuated tohard vacuum,typically 0.001Pa.Askovarand other metals are somewhat permeable to hydrogen, especially during the 600 °Cbake-outbefore evacuation and sealing, all external metal surfaces must be plated with a thick (25 micrometers or more) layer of softgold.The same metallization is used for other switch tubes as well.

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 analuminatube. 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 electronsknocked 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 thejittercan be improved by doping the trigger substrate and modifying the trigger probe structures. Sprytrons can degrade in storage, byoutgassingfrom 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.

Sprytrons can be also triggered by alaserpulse. In 1999 the laser pulse energy needed to trigger a sprytron was reduced to 10 microjoules.

Sprytrons are usually manufactured as rugged metal/ceramicparts. 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-powerMOSFETtransistors operating in avalanche mode show similar behavior.SPICEmodels for sprytrons are available.

Performance

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, lowjittertime 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 achievablejittermay 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).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.

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.

Sprytrons have somewhat faster switching times than krytrons.

Hydrogen-filled thyratrons may be used as a replacement in some applications.

Applications

Krytrons and their variations are manufactured byPerkin-ElmerComponents and used in a variety of industrial and military devices. They are best known for their use in ignitingexploding-bridgewireandslapper detonatorsinnuclear weapons,their original application, either directly (sprytrons are usually used for this) or by triggering higher-powerspark gapswitches. They are also used to triggerthyratrons,largeflashlampsinphotocopiers,lasersand scientific apparatus, and for firing ignitors for industrialexplosives.

Export restrictions in the United States

Because of their potential for use as triggers of nuclear weapons, the export of krytrons is tightlyregulatedin the United States. A number of cases involving thesmugglingor 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 Milchansmuggle 15 orders of 810 krytrons total to Israel in the early 1980s.469 of these were returned to the United States, with Israel claiming the remaining 341 were "destroyed in testing".

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.

In popular culture

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.

The krytron, incorrectly called a "kryton", also appeared in theTom Clancynuclear terrorism novelThe Sum of All Fears.

The plot ofLarry Collins' bookThe Road to Armageddonrevolved heavily around American-made krytrons that Iranian mullahs wanted for three Russian nuclear artillery shells they had hoped to upgrade to full nuclear weapons.

The term "krytron" appeared in the season 3, episode 14 (Provenance) of the television dramaPerson of Interest.

In Season 3 ofNCISepisode "Kill Ari, Part 2", it was revealed that Ari Haswari, a rogue Mossad operative, had been tasked with acquiring a krytron trigger. Along with stolen plutonium from Dimona, these were key components for an Israeli sting operation. The krytron was also incorrectly called a "kryton".

Further developments

Optically triggered solid-state switches based ondiamondare a potential candidate for krytron replacement.

References

• EG&G Electronic Components Catalog, 1994.

CBS/Hytronsecond sourcedocumentation:

• "Krytron Trigger Tubes"spec sheetsE-337,E-337A-1,E-337A-2
• "7229 Cold-Cathode Trigger Tube"data sheet E287B
• "7230 Reliable Cold-Cathode Trigger Tube"data sheet E287C
• "7231 Subminiature Cold-Cathode Trigger Tube"data sheet E287D
• "7232 Reliable Subminiature Cold-Cathode Trigger Tube"data sheet E287E

External links

• John Pasley's article about gas-filled switch tubes, Krytron section
• Photo of a small glass krytron
• 40 month sentence to illegal exporter(though the sentence was definitely related to the 'fugitive' details)