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Text of the page (random words):
o thick it becomes impossible to obtain the required helix pitch for proper operation typically helix twts achieve less than 2 5 kw output power the coupled cavity twt overcomes this limit by replacing the helix with a series of coupled cavities arranged axially along the beam this structure provides a helical waveguide and hence amplification can occur via velocity modulation helical waveguides have very nonlinear dispersion and thus are only narrowband but wider than klystron a coupled cavity twt can achieve 60 kw output power operation is similar to that of a klystron except that coupled cavity twts are designed with attenuation between the slow wave structure instead of a drift tube the slow wave structure gives the twt its wide bandwidth a free electron laser allows higher frequencies traveling wave tube amplifier edit a twt integrated with a regulated power supply and protection circuits is referred to as a traveling wave tube amplifier 8 abbreviated twta and often pronounced tweet uh it is used to produce high power radio frequency signals the bandwidth of a broadband twta can be as high as one octave citation needed although tuned narrowband versions exist operating frequencies range from 300 mhz to 50 ghz a twta consists of a traveling wave tube coupled with its protection circuits as in klystron and regulated power supply electronic power conditioner epc which may be supplied and integrated by a different manufacturer the main difference between most power supplies and those for vacuum tubes is that efficient vacuum tubes have depressed collectors to recycle kinetic energy of the electrons so the secondary winding of the power supply needs up to 6 taps of which the helix voltage needs precise regulation the subsequent addition of a linearizer as for inductive output tube can by complementary compensation improve the gain compression and other characteristics of the twta this combination is called a linearized twta ltwta el tweet uh broadband twtas generally use a helix twt and achieve less than 2 5 kw output power twtas using a coupled cavity twt can achieve 15 kw output power but at the expense of narrower bandwidth invention development and early use edit the original design and prototype of the twt was done by andrei andy haeff c 1931 while he was working as a doctoral student at the kellogg radiation laboratory at caltech his original patent device for and method of controlling high frequency currents was filed in 1933 and granted in 1936 9 10 the invention of the twt is often attributed to rudolf kompfner in 1942 1943 in addition nils lindenblad working at rca radio corporation of america in the usa also filed a patent for a device in may 1940 11 that was remarkably similar to kompfner s twt 12 2 both of these devices were improvements over haeff s original design as they both used the then newly invented precision electron gun as the source of the electron beam and they both directed the beam down the center of the helix instead of outside of it these configuration changes resulted in much greater wave amplification than haeff s design as they relied on the physical principles of velocity modulation and electron bunching 10 kompfner developed his twt in a british admiralty radar laboratory during world war ii 13 his first sketch of his twt is dated november 12 1942 and he built his first twt in early 1943 12 3 14 the twt was later refined by kompfner 14 john r pierce 15 and lester m winslow at bell labs note that kompfner s us patent granted in 1953 does cite haeff s previous work 10 by the 1950s after further development at the electron tube laboratory at hughes aircraft company in culver city california twts went into production there and by the 1960s twts were also produced by such companies as the english electric valve company followed by ferranti in the 1970s 16 17 18 on july 10 1962 the first communications satellite telstar 1 was launched with a 2 w 4 ghz rca designed twt transponder used for transmitting rf signals to earth stations syncom 2 was successfully launched into geosynchronous orbit on july 26 1963 with two 2 w 1850 mhz hughes designed twt transponders one active and one spare 19 20 uses edit twtas are commonly used as amplifiers in satellite transponders where the input signal is very weak and the output needs to be high power 21 twtas used in satellite communications are considered as reliable choices and tend to live beyond their expected lifetime of 15 20 years 22 a twta whose output drives an antenna is a type of transmitter twta transmitters are used extensively in radar particularly in airborne fire control radar systems and in electronic warfare and self protection systems 23 in such applications a control grid is typically introduced between the twt s electron gun and slow wave structure to allow pulsed operation the circuit that drives the control grid is usually referred to as a grid modulator twtas have found applications in a number of spacecraft including all five of the space probes that have achieved the escape velocity to leave the solar system 24 25 for example dual redundant 12 watt x band twtas are mounted on the body under the dish of the new horizons spacecraft 26 which visited pluto in 2015 then kuiper belt object 486958 arrokoth in 2019 to return data at a distance of 43 4 au from the sun launched in 2021 james webb space telescope makes use of k a band twts 25 historical notes edit a twt has sometimes been referred to as a traveling wave amplifier tube twat 27 although this term was never widely adopted twt has been pronounced by engineers as twit 28 and twta as tweeta 29 see also edit distributed amplifier magnetron klystron tube crossed field amplifier backward wave oscillator inductive output tube extended interaction oscillator references edit electronics world wireless world reed business pub 1991 p 66 1 2 3 4 5 6 7 gilmour a s 2011 klystrons traveling wave tubes magnetrons crossed field amplifiers and gyrotrons artech house pp 317 18 isbn 978 1608071852 1 2 3 4 5 whitaker jerry c 2002 the rf transmission systems handbook crc press pp 8 14 8 16 isbn 1420041134 1997 industrial assessment of the microwave power tube industry us department of defense beryllium oxide properties traveling wave tube velocity modulated tubes john everett 1992 vsats very small aperture terminals iet isbn 0 86341 200 9 us 2064469 haeff andrew v device for and method of controlling high frequency currents published 1936 12 15 assigned to radio corporation of america 1 2 3 copeland jack haeff andre a september 2015 the true history of the traveling wave tube ieee spectrum 52 9 38 43 doi 10 1109 mspec 2015 7226611 s2cid 36963575 us 2300052 lindenblad nils e electron discharge device system published 1942 10 27 assigned to radio corporation of america 1 2 gilmour a s 1994 principles of traveling wave tubes artech house radar library boston artech house pp 2 3 isbn 978 0 890 06720 8 shulim e tsimring 2007 electron beams and microwave vacuum electronics john wiley and sons p 298 isbn 978 0 470 04816 0 1 2 kompfner rudolf 1964 the invention of the traveling wave tube san francisco press pierce john r 1950 traveling wave tubes d van nostrand co fire direct web site archived 2009 09 23 at the wayback machine accessed 2 july 2008 twt travelling wave tubes archived from the original on 2008 09 19 retrieved 2008 07 08 griffiths hugh september 1980 travelling wave tube amplifiers radcom retrieved 2015 07 15 zimmerman robert fall 2000 telstar invention and technology magazine 16 2 american heritage archived from the original on october 13 2007 retrieved 2 july 2008 pond norman h 2008 the tube guys west plains missouri russ cochran p 328 isbn 978 0 9816923 0 2 archived from the original on june 19 2010 dennis roddy 2006 satellite communications mcgraw hill professional isbn 0 07 146298 8 lohmeyer whitney q aniceto raichelle j cahoy kerri l 2016 communication satellite power amplifiers current and future sspa and twta technologies international journal of satellite communications and networking 34 2 95 113 doi 10 1002 sat 1098 hdl 1721 1 110897 l sivan 1994 microwave tube transmitters springer isbn 0 412 57950 2 ludwig roger taylor jim march 2002 voyager telecommunications pdf descanso design and performance summary series retrieved 7 may 2024 1 2 minenna damien f g andré frédéric elskens yves auboin jean françois doveil fabrice puech jérôme duverdier elise 2019 the traveling wave tube in the history of telecommunication eur phys j h 44 1 1 36 arxiv 1803 11497 bibcode 2019epjh 44 1m doi 10 1140 epjh e2018 90023 1 deboy christopher c et al 2004 the rf telecommunications system for the new horizons mission to pluto 2004 ieee aerospace conference proceedings ieee cat no 04th8720 vol 3 pp 1463 1478 doi 10 1109 aero 2004 1367922 isbn 0 7803 8155 6 military acronyms initialisms and abbreviations federation of american scientists archived from the original on 2007 10 21 henry w cole 1985 understanding radar collins isbn 9780003830583 mark williamson 1990 dictionary of space technology a hilger isbn 0852743394 further reading edit copeland jack haeff andre a september 2015 the true history of the traveling wave tube armstrong carter m november 2015 the quest for the ultimate vacuum tube ieee spectrum external links edit memorial page with photo of john pierce holding a twt nyquist page with photo of pierce kompfner and nyquist in front of twt calculations on blackboard tmd travelling wave tubes information pdf data sheets flash animation showing the operation of a traveling wave tube twt and its internal construction v t e electronic components semiconductor devices mos transistors transistor nmos pmos bicmos biofet chemical field effect transistor chemfet complementary mos cmos depletion load nmos fin field effect transistor finfet floating gate mosfet fgmos insulated gate bipolar transistor igbt isfet ldmos mos field effect transistor mosfet multi gate field effect transistor mugfet power mosfet thin film transistor tft vmos umos qfet tunnel field effect transistor tfet high electron mobility transistor hemt rf cmos native transistor other transistors bipolar junction transistor bjt darlington transistor diffused junction transistor field effect transistor fet junction gate fet jfet organic fet ofet light emitting transistor let pentode transistor point contact transistor programmable unijunction transistor put static induction transistor sit tetrode transistor nanoscale vacuum channel transistor nvct single electron transistor set heterojunction bipolar transistor hbt mesfet heterostructure emitter bipolar transistor hebt itfet avalanche transistor junctionless nanowire transistor jlnt schottky transistor spin transistor ballistic collection transistor ballistic deflection transistor bdt drift field transistor organic electrochemical transistor oect spacistor surface barrier transistor synaptic transistor oxide thin film transistor nomfet grown junction transistor eosfet alloy junction transistor fe fet dna field effect transistor dnafet diodes avalanche diode shockley diode selenium rectifier fast diode single photon avalanche diode spad constant current diode cld crd gunn diode varicap impatt diode metal insulator metal diode mim diode transient voltage suppression diode tvs diode laser diode ld light emitting diode led organic light emitting diode oled photodiode pin diode p n diode tunnel diode avalanche photodiode apd solar cell multi junction solar cell mj hybrid solar cell schottky junction solar cell plasmonic solar cell heterojunction solar cell hjt schottky diode step recovery diode srd zener diode resonant tunneling diode rtd photoreflector backward diode geometric diode lr diode chua s diode baritt diode stabistor phosphorescent organic light emitting diode pholed thin film diode superluminescent diode sld josephson diode hole accumulation diode had silicon photomultiplier sipm metal rectifier bifacial solar cells bsc integrated circuits hybrid integrated circuit hic mixed signal integrated circuit mos integrated circuit mos ic three dimensional integrated circuit 3d ic photonic integrated circuit pic application specific integrated circuit asic field programmable gate array fpga system on a chip soc other devices diac heterostructure barrier varactor light emitting capacitor lec memistor memristor memtransistor memory cell metal oxide varistor mov organic semiconductor photodetector silicon controlled rectifier scr silicon controlled switch scs solaristor static induction thyristor sith thyristor trancitor triac varicap vertical cavity surface emitting laser vcsel gate turn off thyristor gto integrated gate commutated thyristor igct unijunction transistor ujt quantum cascade laser qcl photoresistor quantum dot display quantum dot solar cell photoelectrochemical cell dye sensitized solar cell plasmonic solar cell quantum dot laser quadrac interband cascade laser icl oscillistor mos composite static induction thyristor csmt mos controlled thyristor mct resistive opto isolator ro emitter turn off thyristor eto trisil quantum well infrared photodetector qwip quantum cascade detector qcd resonant cavity enhanced photo detector rce golay cell hybrid pixel detector semiconductor detector voltage regulators linear regulator low dropout regulator switching regulator buck boost buck boost split pi ćuk sepic charge pump switched capacitor vacuum tubes standard acorn tube audion beam tetrode barretter compactron diode fleming valve neutron tube nonode nuvistor pentagrid hexode heptode octode pentode photomultiplier pmt phototube tetrode triode x ray tube double diode triode additron tube computron tube micropup rf backward wave oscillator bwo cavity magnetron crossed field amplifier cfa gyrotron inductive output tube iot klystron maser sutton tube traveling wave tube twt vircator cathode ray tubes beam deflection tube charactron iconoscope magic eye tube monoscope selectron tube storage tube trochotron video camera tube williams tube gas filled tubes crossatron dekatron ignitron krytron mercury arc valve nixie tube thyratron trigatron voltage regulator tube geiger müller tube wire chamber neon lamp adjustable potentiometer digital variable capacitor varicap passive connector audio and video electrical power rf ferrite antifuse fuse resettable efuse resistor switch thermistor varistor reactive capacitor types ceramic resonator crystal oscillator inductor relay reed relay mercury relay other devices hall effect sensor squid spin valve magnetic tunnel junction mtj planar hall sensor ggnmos retrieved from https en wikipedia org w index php title traveling wave_tube oldid 1352138698 categories british inventions microwave technology vacuum tubes hidden categories articles with short description short description is different from wikidata all articles with unsourced statements articles with unsourced statements from july 2010 webarchive template wayback links this page was last edited on 2 may 202...