{"id":36248,"date":"2019-10-31T22:10:29","date_gmt":"2019-10-31T19:10:29","guid":{"rendered":"https:\/\/prohoster.info\/blog\/mal-da-udal-miniatyurnyj-linejnyj-uskoritel-chastits-postavivshij-novyj-rekord\/"},"modified":"2019-10-31T22:10:29","modified_gmt":"2019-10-31T19:10:29","slug":"mal-da-udal-miniatyurnyj-linejnyj-uskoritel-chastits-postavivshij-novyj-rekord","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sq\/blog\/novosti-interneta\/mal-da-udal-miniatyurnyj-linejnyj-uskoritel-chastits-postavivshij-novyj-rekord","title":{"rendered":"I vog\u00ebl, por i fuqish\u00ebm: nj\u00eb linj\u00eb e vog\u00ebl e p\u00ebrshpejtuesit t\u00eb grimcave q\u00eb vendosi nj\u00eb rekord t\u00eb ri","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><img decoding=\"async\" alt=\"I vog\u00ebl, por i fuqish\u00ebm: nj\u00eb linj\u00eb e vog\u00ebl e p\u00ebrshpejtuesit t\u00eb grimcave q\u00eb vendosi nj\u00eb rekord t\u00eb ri\" src=\"\/wp-content\/uploads\/2019\/07\/6df72c15b548271b03607338af4348b1.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nParimi i njohur \"m\u00eb shum\u00eb do t\u00eb thot\u00eb m\u00eb i fuqish\u00ebm\" \u00ebsht\u00eb vendosur prej koh\u00ebsh n\u00eb shum\u00eb sektor\u00eb t\u00eb jet\u00ebs s\u00eb shoq\u00ebris\u00eb, p\u00ebrfshir\u00eb shkenc\u00ebn dhe Teknologjin\u00eb. Megjithat\u00eb, n\u00eb realitetin modern, ne shpesh shohim implementimin praktik t\u00eb th\u00ebnieve \"i vog\u00ebl, por ndikues\". Kjo shfaqet si n\u00eb kompjuter\u00ebt q\u00eb dikur zinin nj\u00eb t\u00ebr\u00eb dhom\u00eb, por tani futen n\u00eb nj\u00ebr\u00ebn dor\u00eb t\u00eb nj\u00eb f\u00ebmije, ashtu si edhe n\u00eb p\u00ebrshpejtuesit e grimcave t\u00eb ngarkuara. Po, kujtoni tunnelin e madh t\u00eb hadron\u00ebve (LHC), dimensionet e impozante t\u00eb t\u00eb cilit (26,659 m n\u00eb gjat\u00ebsi) jan\u00eb tregues t\u00eb nominimit t\u00eb tij? Sipas shkenc\u00ebtar\u00ebve t\u00eb DESY, kjo \u00ebsht\u00eb tashm\u00eb e shkuara, pasi ata kan\u00eb zhvilluar nj\u00eb version miniatur\u00eb t\u00eb p\u00ebrshpejtuesit q\u00eb nuk i l\u00eb pas performancat e paraardh\u00ebsit t\u00eb tij me madh\u00ebsi t\u00eb plot\u00eb. P\u00ebr m\u00eb tep\u00ebr, mini p\u00ebrshpejtuesi ka vendosur nj\u00eb rekord bot\u00ebror t\u00eb ri midis p\u00ebrshpejtuesve t\u00eb teraherc\u00ebve, duke dyfishuar energjin\u00eb e elektroneve t\u00eb inkorporuar. Si u zhvillua p\u00ebrshpejtuesi miniatur\u00eb, cilat jan\u00eb parimet e tij kryesore t\u00eb funksionimit dhe \u00e7far\u00eb treguan eksperimentet praktike? P\u00ebr k\u00ebto do t\u00eb na ndihmoj\u00eb raporti i grupit hulumtues. Le t\u00eb fillojm\u00eb.<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<h3>Baza e studimit<\/h3>\n<p>\nSipas Dongfang Zhang dhe koleg\u00ebve t\u00eb tij nga DESY (Sinhronizimi Elektronik Gjerman), t\u00eb cil\u00ebt zhvilluan miniasceleratorin, burimet super t\u00eb shpejta t\u00eb elektronit luajn\u00eb nj\u00eb rol jasht\u00ebzakonisht t\u00eb r\u00ebnd\u00ebsish\u00ebm n\u00eb jet\u00ebn e shoq\u00ebris\u00eb moderne. Shumica e tyre manifestohen n\u00eb mjek\u00ebsi, zhvillimin e elektronik\u00ebs dhe k\u00ebrkimin shkencor. Problemi m\u00eb i madh i aktualeve akcelerator\u00eb linear\u00eb, t\u00eb cil\u00ebt p\u00ebrdorin gjenerator\u00eb me frekuenc\u00eb radio, \u00ebsht\u00eb kostoja e lart\u00eb, kompleksiteti i infrastruktur\u00ebs dhe nevojat e m\u00ebdha p\u00ebr energji. K\u00ebto mang\u00ebsi ndihmojn\u00eb shum\u00eb n\u00eb kufizimin e aksesit p\u00ebr teknologji t\u00eb tilla p\u00ebr nj\u00eb audienc\u00eb m\u00eb t\u00eb gjer\u00eb. <\/p>\n<p>K\u00ebto probleme t\u00eb dukshme jan\u00eb nj\u00eb stimuj i shk\u00eblqyer p\u00ebr zhvillimin e pajisjeve, dimensionet e t\u00eb cilave nuk do t\u00eb shkaktojn\u00eb frik\u00eb, ashtu si niveli i energjis\u00eb s\u00eb konsumuar.<\/p>\n<p>Nd\u00ebr risit\u00eb relative n\u00eb k\u00ebt\u00eb industri, mund t\u00eb theksohen akcelerator\u00ebt teraherc, t\u00eb cil\u00ebt ofrojn\u00eb nj\u00eb s\u00ebr\u00eb 'p\u00ebrfitimesh':<\/p>\n<ul>\n<li>pritet q\u00eb val\u00ebt e shkurtra dhe impulsat e shkurtra t\u00eb rrezatimit teraherc t\u00eb rrisin duksh\u00ebm pragun <i>thyerjes*<\/i>, t\u00eb shkaktuar nga fusha, duke lejuar k\u00ebshtu rritjen e gradienteve t\u00eb akcelerimit;<\/li>\n<\/ul>\n<blockquote><p><b>Rrjedha elektrike*<\/b> \u2014 nj\u00eb rritje e menj\u00ebhershme e forc\u00ebs s\u00eb rrym\u00ebs kur aplikohet nj\u00eb tension mbi kritikun.<\/p><\/blockquote>\n<ul>\n<li>prania e metodave efikase p\u00ebr gjenerimin e rrezatimit terahertz me fush\u00eb t\u00eb lart\u00eb mund\u00ebson realizimin e sinkronizimit t\u00eb brendsh\u00ebm mes elektron\u00ebve dhe fushave t\u00eb nxjerrjes;<\/li>\n<li>p\u00ebr krijimin e k\u00ebsaj pajisjeje mund t\u00eb p\u00ebrdoren metoda klasike, por kostoja, koha e prodhimit dhe p\u00ebrmasat do t\u00eb reduktohen ndjesh\u00ebm. <\/li>\n<\/ul>\n<p>Shkenc\u00ebtar\u00ebt mendojn\u00eb se aceleratori i tyre terahertz n\u00eb p\u00ebrmasat milimetrike \u00ebsht\u00eb nj\u00eb kompromis midis acelerator\u00ebve t\u00eb zakonsh\u00ebm q\u00eb ka tani dhe mikro-acelerator\u00ebve q\u00eb po zhvillohen, por kan\u00eb shum\u00eb disavantazhe p\u00ebr shkak t\u00eb p\u00ebrmasave t\u00eb tyre tejet t\u00eb vogla.<\/p>\n<p>K\u00ebrkuesit nuk e mohojn\u00eb se teknologjia e accelerimit terahertz ka qen\u00eb n\u00eb zhvillim p\u00ebr nj\u00eb koh\u00eb t\u00eb caktuar. Megjithat\u00eb, sipas tyre, n\u00eb k\u00ebt\u00eb fush\u00eb ka ende shum\u00eb aspekte q\u00eb nuk jan\u00eb studiuar, verifikuar ose realizuar. <\/p>\n<p>N\u00eb pun\u00ebn e tij, e cila po shqyrtojm\u00eb sot, shkenc\u00ebtar\u00ebt demonstrojn\u00eb mund\u00ebsit\u00eb e STEAM (<i>acceleratori dhe manipuluesi i elektron\u00ebve terahertz t\u00eb segmentuar)<\/i>) \u2014 e caktuar nga nj\u00eb elektron accelerator dhe manipulator t\u00eb segmentuar teraherc. STEAM lejon t\u00eb reduktoj\u00eb gjat\u00ebsi e nj\u00eb oborri elektron\u00ebsh n\u00eb subpikosekond\u00eb, duke siguruar k\u00ebshtu kontroll femtosekond mbi faz\u00ebn e p\u00ebrshpejtimit.<\/p>\n<p>Arrit\u00ebm nj\u00eb fush\u00eb p\u00ebrshpejtimi prej 200 MV\/m (MV \u2014 megavolt), q\u00eb \u00e7on n\u00eb p\u00ebrshpejtim rekord teraherc me &gt; 70 keV (kiloelectronvolt) nga oborri i futur i elektron\u00ebve me energji 55 keV. K\u00ebshtu u arrit\u00ebn elektron\u00ebt e p\u00ebrshpejtuar deri n\u00eb 125 keV.<\/p>\n<h3>Struktura e pajisjes dhe implementimi i saj<\/h3>\n<p>\n<img decoding=\"async\" alt=\"I vog\u00ebl, por i fuqish\u00ebm: nj\u00eb linj\u00eb e vog\u00ebl e p\u00ebrshpejtuesit t\u00eb grimcave q\u00eb vendosi nj\u00eb rekord t\u00eb ri\" src=\"\/wp-content\/uploads\/2019\/07\/581d753c9734024561fa600f132a7e8d.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>Imazhi \u21161: diagrami i pajisjes q\u00eb po studiohet.<\/i><\/p>\n<p><img decoding=\"async\" alt=\"I vog\u00ebl, por i fuqish\u00ebm: nj\u00eb linj\u00eb e vog\u00ebl e p\u00ebrshpejtuesit t\u00eb grimcave q\u00eb vendosi nj\u00eb rekord t\u00eb ri\" src=\"\/wp-content\/uploads\/2019\/07\/d404ba9fe59504ac46e730aefbbf2134.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>Imazhi \u21161-2: a \u2014 diagrami i struktur\u00ebs s\u00eb zhvilluar segmentuar me 5 shtresa, b \u2014 raporti midis p\u00ebrshpejtimit t\u00eb llogaritur dhe drejtimit t\u00eb p\u00ebrhapjes s\u00eb elektron\u00ebve.<\/i><\/p>\n<p>Oborret e elektron\u00ebve (55 keV) gjenerohen nga <i>pistoleta elektronike*<\/i> dhe futen n\u00eb STEAM-buncher teraherc (kompresori i oborrit), pas s\u00eb cil\u00ebs kalojn\u00eb n\u00eb STEAM-linac (<i>acceleratori linear*<\/i>).<\/p>\n<blockquote><p><b>Pistoleta elektronike*<\/b> \u2014 pajisja p\u00ebr gjenerimin e oborrit t\u00eb elektron\u00ebve me konfigurimin dhe energjin\u00eb e nevojshme.<\/p><\/blockquote>\n<blockquote><p><b>Acceleratori linear*<\/b> \u2014 nj\u00eb p\u00ebrshpejtues ku grimcat e ngarkuara kalojn\u00eb struktur\u00ebn vet\u00ebm nj\u00eb her\u00eb, \u00e7ka e dallon p\u00ebrshpejtuesin linear nga ai ciklik (p.sh., BAK). <\/p><\/blockquote>\n<p>T\u00eb dy pajisjet STEAM marrin impulse terahertz nga nj\u00eb lazer drite infrarouj t\u00eb af\u00ebrt (NIR), i cili gjithashtu nis fotokatin e arm\u00ebs elektronike, duke \u00e7uar n\u00eb nj\u00eb sinkronizim t\u00eb brendsh\u00ebm mes elektron\u00ebve dhe fushave p\u00ebrshpejtues. Impulset ultraviolet p\u00ebr fotoemisionin n\u00eb fotokatin krijohen p\u00ebrmes dy fazave t\u00eb ndjekura. <i>GVG*<\/i> gjat\u00ebsin\u00eb kryesore t\u00eb val\u00ebs s\u00eb drit\u00ebs infrarouj t\u00eb af\u00ebrt. Ky proces transformon impulsin lazer me gjat\u00ebsi vale 1020 nm fillimisht n\u00eb 510 nm, dhe m\u00eb pas n\u00eb 255 nm.<\/p>\n<blockquote><p><b>GVG*<\/b> (krijimi i harmonik\u00ebs optike t\u00eb dyt\u00eb) \u2014 nj\u00eb proces i bashkimit t\u00eb foton\u00ebve me frekuenca t\u00eb njejta gjat\u00eb nd\u00ebrveprimit me nj\u00eb material jo-linear, duke \u00e7uar n\u00eb formimin e foton\u00ebve t\u00eb rinj me energji dhe frekuenc\u00eb t\u00eb dyfisht\u00eb, si dhe nj\u00eb gjat\u00ebsi vale dyfish m\u00eb t\u00eb vog\u00ebl.<\/p><\/blockquote>\n<p>Pjesa e mbetur e rrezeve NIR-lazer ndahen n\u00eb 4 rreze, t\u00eb cilat p\u00ebrdoren p\u00ebr t\u00eb gjeneruar kat\u00ebr impulse terahertz me nj\u00eb cik\u00ebl fal\u00eb gjenerimit t\u00eb diferencave t\u00eb frekuencave brenda impulsit.<\/p>\n<p>Dy t\u0259ragherc impulsat m\u00eb pas kalojn\u00eb n\u00eb \u00e7do pajisje STEAM p\u00ebrmes strukturave simetrike t\u00eb brir\u00ebve, t\u00eb cilat drejtojn\u00eb energjin\u00eb t\u0259ragherce n\u00eb zon\u00ebn e nd\u00ebrveprimit p\u00ebrtej drejtimit t\u00eb p\u00ebrhapjes s\u00eb elektronik\u00ebve.<\/p>\n<p>Kur elektronik\u00ebt hyjn\u00eb n\u00eb secil\u00ebn nga pajisjet STEAM, ata ekspozohen ndaj p\u00ebrb\u00ebr\u00ebsve elektrik\u00eb dhe magnetik\u00eb. <i>forca Lorentz*<\/i>.<\/p>\n<blockquote><p><b>forca Lorentz*<\/b> \u2014 \u00ebsht\u00eb forca me t\u00eb cil\u00ebn fusha elektromagnetike ndikon n\u00eb nj\u00eb grimc\u00eb t\u00eb ngarkuar.<\/p><\/blockquote>\n<p>N\u00eb k\u00ebt\u00eb rast, fusha elektrike \u00ebsht\u00eb p\u00ebrgjegj\u00ebs p\u00ebr p\u00ebrshpejtimin dhe ngadal\u00ebsimin, nd\u00ebrsa fusha magnetike shkakton devijime t\u00eb p\u00ebrqafojshme.<\/p>\n<p><img decoding=\"async\" alt=\"I vog\u00ebl, por i fuqish\u00ebm: nj\u00eb linj\u00eb e vog\u00ebl e p\u00ebrshpejtuesit t\u00eb grimcave q\u00eb vendosi nj\u00eb rekord t\u00eb ri\" src=\"\/wp-content\/uploads\/2019\/07\/6e56629be1c0de410ab1411baaceff14.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>Imazhi \u21162<\/i><\/p>\n<p>Si\u00e7 e shohim n\u00eb imazhe <b>2a<\/b> dhe <b>2b<\/b>, brenda \u00e7do pajisje STEAM, tufa t\u0259ragherce ndahen p\u00ebrmes flet\u00ebve t\u00eb metalizuara t\u00eb holla n\u00eb disa shtresa me trash\u00ebsi t\u00eb ndryshme, secila prej t\u00eb cilave vepron si nj\u00eb valvod, duke transferuar nj\u00eb pjes\u00eb t\u00eb energjis\u00eb totale n\u00eb zon\u00ebn e nd\u00ebrveprimit. Gjithashtu, n\u00eb \u00e7do shtres\u00eb ka pllaka dielektrike p\u00ebr t\u00eb harmonizuar koh\u00ebn e arritjes s\u00eb t\u0259ragherc\u00ebs <i>val\u00eb fronti*<\/i> me frontin e elektronik\u00ebve.<\/p>\n<blockquote><p><b>Fronti i val\u00ebs*<\/b> \u2014 \u00ebsht\u00eb sip\u00ebrfaqja deri n\u00eb t\u00eb cil\u00ebn ka arritur vala.<\/p><\/blockquote>\n<p>T\u00eb dy pajisjet STEAM funksionojn\u00eb n\u00eb nj\u00eb mod elektrik, q\u00eb do t\u00eb thot\u00eb se prodhojn\u00eb nj\u00eb fush\u00eb elektrike dhe frenimin e fush\u00ebs magnetike n\u00eb qend\u00ebr t\u00eb zon\u00ebs s\u00eb nd\u00ebrveprimit.<\/p>\n<p>N\u00eb pajisjen e par\u00eb, elektronet jan\u00eb programuar me koh\u00eb q\u00eb t\u00eb kalojn\u00eb p\u00ebrmes <i>kryq\u00ebzimit t\u00eb zeros*<\/i> t\u00eb fush\u00ebs teraherce, ku gradientet e koh\u00ebs t\u00eb fush\u00ebs elektrike jan\u00eb maksimalizuar dhe fusha mesatare \u00ebsht\u00eb minimizuar.<\/p>\n<blockquote><p><b>Kryq\u00ebzimi i zeros*<\/b> \u00ebsht\u00eb pika ku nuk ka tension.<\/p><\/blockquote>\n<p>Kjo konfigurim shkakton accelerimin e bishtit t\u00eb ritheksit t\u00eb elektron\u00ebve dhe ngadalsimin e kok\u00ebs s\u00eb tij, duke \u00e7uar n\u00eb fokusin balistik longitudinal (<b>2a<\/b> dhe <b>2s<\/b>).<\/p>\n<p>N\u00eb pajisjen e dyt\u00eb, sinkronizimi i elektronit dhe rrezatimit teraherce vendoset n\u00eb m\u00ebnyr\u00eb q\u00eb ritheksi i elektronit t\u00eb p\u00ebrjetoj\u00eb vet\u00ebm ciklin negativ t\u00eb fush\u00ebs elektrike teraherce. Kjo konfigurim \u00e7on n\u00eb nj\u00eb shkallim t\u00eb vazhduesh\u00ebm t\u00eb past\u00ebr (<b>2b<\/b> dhe <b>2d<\/b>).<\/p>\n<p>Lazeri me emitim NIR \u00ebsht\u00eb i ngjash\u00ebm me sistemin Yb:YLF me ftohje kriogjenike, i cili jep impulse optike me nj\u00eb koh\u00ebzgjatje prej 1.2 ps dhe energji prej 50 mJ n\u00eb gjat\u00ebsi vale 1020 nm dhe frekuenc\u00eb p\u00ebrs\u00ebritjeje 10 Hz. Nd\u00ebrsa impulsat teraherc me frekuenc\u00eb qendrore 0.29 teraherc (periudha 3.44 ps) gjenerohen me metod\u00ebn e frontit t\u00eb k\u00ebnduar t\u00eb impulsit.<\/p>\n<p>P\u00ebr energjimin e STEAM-buncher (kompresori i \u00e7ar\u00e7afit) jan\u00eb p\u00ebrdorur vet\u00ebm 2 x 50 nJ energji teraherc, nd\u00ebrsa p\u00ebr STEAM-linac (acceleratori linear) nevojiten 2 x 15 mJ.<\/p>\n<p>Diametri i hapjeve hyr\u00ebse dhe dal\u00ebse t\u00eb t\u00eb dy aparateve STEAM \u00ebsht\u00eb 120 \u03bcm.<\/p>\n<p>Kompresori i \u00e7ar\u00e7afit \u00ebsht\u00eb dizajnuar me tre shtresa me lart\u00ebsi t\u00eb barabart\u00eb (0.225 mm), t\u00eb cilat jan\u00eb t\u00eb pajisura me pllaka nga kuarci i shkrir\u00eb (\u03f5r =4.41) me gjat\u00ebsi 0.42 dhe 0.84 mm p\u00ebr kontrollin e sinkronizimit temporal. Lart\u00ebsit\u00eb e barabarta t\u00eb shtresave t\u00eb kompresorit reflektojn\u00eb faktin se nuk ndodh nd\u00ebrlikim (<b>2s<\/b>).<\/p>\n<p>Nd\u00ebrsa n\u00eb acceleratin linear, lart\u00ebsit\u00eb tashm\u00eb ndryshojn\u00eb \u2014 0.225, 0.225 dhe 0.250 mm (+ pllaka nga kuarci i shkrir\u00eb 0.42 dhe 0.84 mm). Rritja e lart\u00ebsis\u00eb s\u00eb shtres\u00ebs shpjegon rritjen e shpejt\u00ebsis\u00eb s\u00eb elektron\u00ebve gjat\u00eb akcelerimit.<\/p>\n<p>Shkenc\u00ebtar\u00ebt v\u00ebrejn\u00eb se numri i shtresave ndikon direkt n\u00eb funksionalitetin e secil\u00ebs nga dy pajisjet. P\u00ebr t\u00eb arritur nj\u00eb grad\u00eb m\u00eb t\u00eb lart\u00eb p\u00ebrshpejtimi, p\u00ebr shembull, nevojiten m\u00eb shum\u00eb shtresa dhe nj\u00eb konfigurim tjet\u00ebr lart\u00ebsish p\u00ebr t\u00eb optimizuar nd\u00ebrveprimin.<\/p>\n<h3>Rezultatet e eksperimenteve praktike<\/h3>\n<p>\nS\u00eb pari, hulumtuesit e kujtojn\u00eb se n\u00eb p\u00ebrshpejtuesit tradicional\u00eb bazuar n\u00eb radiofrekuenc\u00eb, ndikimi i gjat\u00ebsi s\u00eb koh\u00ebs s\u00eb plazm\u00ebs elektronike t\u00eb futur n\u00eb pronat e plazm\u00ebs s\u00eb p\u00ebrshpejtuar lidhet me ndryshimin e fush\u00ebs elektrike q\u00eb p\u00ebrjetohen gjat\u00eb nd\u00ebrveprimit nga elektronet e ndryshme brenda plazm\u00ebs, t\u00eb cilat arrijn\u00eb n\u00eb momente t\u00eb ndryshme. K\u00ebshtu, mund t\u00eb supozohet se fushat me gradient m\u00eb t\u00eb lart\u00eb dhe plazmat me gjat\u00ebsi m\u00eb t\u00eb madhe do t\u00eb \u00e7ojn\u00eb n\u00eb nj\u00eb shp\u00ebrndarje m\u00eb t\u00eb madhe energjie. Plazmat me gjat\u00ebsi m\u00eb t\u00eb madhe gjithashtu mund t\u00eb \u00e7ojn\u00eb n\u00eb vlera m\u00eb t\u00eb larta. <i>emitancat*<\/i>.<\/p>\n<blockquote><p><b>Emitanc\u00eb*<\/b> \u2014 hap\u00ebsira fazore q\u00eb z\u00eb plazm\u00ebn e p\u00ebrshpejtuar t\u00eb grimcave t\u00eb ngarkuara.<\/p><\/blockquote>\n<p>N\u00eb rastin e p\u00ebrshpejtuesit teraherc, periudha e fush\u00ebs s\u00eb eksitimit \u00ebsht\u00eb rreth 200 her\u00eb m\u00eb e shkurt\u00ebr. Prandaj, <i>intensiteti*<\/i> i fush\u00ebs s\u00eb mbajtur do t\u00eb jet\u00eb 10 her\u00eb m\u00eb i lart\u00eb. <\/p>\n<blockquote><p><b>Intensiteti i fush\u00ebs elektrike* <\/b> \u2014 treguesi i fush\u00ebs elektrike, q\u00eb \u00ebsht\u00eb marr\u00ebdh\u00ebnia midis forc\u00ebs s\u00eb aplikuar n\u00eb nj\u00eb ngarkes\u00eb pik\u00eb statike, e vendosur n\u00eb k\u00ebt\u00eb pik\u00eb t\u00eb fush\u00ebs, dhe madh\u00ebsis\u00eb s\u00eb k\u00ebtij ngarkimi. <\/p><\/blockquote>\n<p>N\u00eb k\u00ebt\u00eb m\u00ebnyr\u00eb, n\u00eb nj\u00eb akcelerator teraherc, gradientet e fush\u00ebs q\u00eb p\u00ebrjetojn\u00eb elektronet mund t\u00eb jen\u00eb disa rendit m\u00eb t\u00eb larta se n\u00eb nj\u00eb pajisje t\u00eb zakonshme. Koha gjat\u00eb s\u00eb cil\u00ebs ~krivina e fush\u00ebs \u00ebsht\u00eb e dukshme do t\u00eb jet\u00eb ndjesh\u00ebm m\u00eb e shkurt\u00ebr. Prandaj, koh\u00ebzgjatja e grupit t\u00eb futur t\u00eb elektroneve do t\u00eb ket\u00eb nj\u00eb ndikim m\u00eb t\u00eb duksh\u00ebm.<\/p>\n<p>Shkenc\u00ebtar\u00ebt vendos\u00ebn t\u00eb verifikojn\u00eb k\u00ebto t\u00eb dh\u00ebna teorike n\u00eb praktik\u00eb. P\u00ebr k\u00ebt\u00eb ata fut\u00ebn grupe elektron\u00ebsh me gjat\u00ebsi t\u00eb ndryshme, e cila kontrollohej nga ngjeshja p\u00ebrmes pajisjes s\u00eb par\u00eb STEAM (SQUEEZE-buncher).<\/p>\n<p><img decoding=\"async\" alt=\"I vog\u00ebl, por i fuqish\u00ebm: nj\u00eb linj\u00eb e vog\u00ebl e p\u00ebrshpejtuesit t\u00eb grimcave q\u00eb vendosi nj\u00eb rekord t\u00eb ri\" src=\"\/wp-content\/uploads\/2019\/07\/1d15ed2cec289b62df3d7a8a1fc2962c.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>Imazhi Nr. 3<\/i><\/p>\n<p>Kur kompresori nuk ishte i lidhur me burimin e energjis\u00eb, grupet e elektron\u00ebve (55 keV) me ngarkes\u00eb \u223c1 fC (femtokoulon) kalonin rreth 300 mm nga arma elektronike n\u00eb pajisjen e akceleratorit linear (STEAM-linac). K\u00ebta elektrone mund t\u00eb shtriheshin n\u00ebn ndikimin e forcave t\u00eb ngarkes\u00ebs hap\u00ebsinore deri n\u00eb nj\u00eb koh\u00ebzgjatje m\u00eb shum\u00eb se 1000 fs (femtosekonda).<\/p>\n<p>Me nj\u00eb koh\u00ebzgjatje t\u00eb till\u00eb, rrezja elektronike zinte rreth 60% t\u00eb gjysm\u00ebvale t\u00eb fush\u00ebs akceleruese me frekuenc\u00eb 1.7 ps, e cila \u00e7onte n\u00eb nj\u00eb spekter energjie pas akcelerimit me nj\u00eb maj\u00eb n\u00eb 115 keV dhe nj\u00eb gjysm\u00ebgjer\u00ebsi t\u00eb shp\u00ebrndarjes s\u00eb energjis\u00eb mbi 60 keV (<b>3a<\/b>).<\/p>\n<p>P\u00ebr t\u00eb krahasuar k\u00ebto rezultate me ato t\u00eb pritura, u modelua situata e p\u00ebrhapjes s\u00eb elektron\u00ebve p\u00ebrmes nj\u00eb akcelERATORI linear, kur elektron\u00ebt ishin jasht\u00eb sinkronizimit (dmth. nuk p\u00ebrputhen me) n\u00eb lidhje me koh\u00ebn optimale t\u00eb futjes. Llogaritjet e k\u00ebsaj situate treguan se rritja e energjis\u00eb s\u00eb elektron\u00ebve varet shum\u00eb nga momenti i futjes deri n\u00eb shkall\u00ebn subpikosekondare (<b>3b<\/b>). K\u00ebshtu, n\u00eb konfigurim optimal, elektroni do t\u00eb p\u00ebrjetoj\u00eb periudh\u00ebn e plot\u00eb t\u00eb akcelerimit t\u00eb rrezatimit teraherc n\u00eb \u00e7do shtres\u00eb (<b>3c<\/b>).<\/p>\n<p>Por n\u00ebse elektron\u00ebt arrijn\u00eb n\u00eb koh\u00eb t\u00eb ndryshme, ata p\u00ebrjetojn\u00eb m\u00eb pak akcelerim n\u00eb shtres\u00ebn e par\u00eb, nga e cila u duhet m\u00eb shum\u00eb koh\u00eb p\u00ebr ta kaluar. M\u00eb pas, jasht\u00eb sinkronizimi forcohet n\u00eb shtresat e m\u00ebpasme, duke shkaktuar vones\u00eb t\u00eb pad\u00ebshiruar (<b>3d<\/b>). <\/p>\n<p>P\u00ebr t\u00eb minimize efektin negativ t\u00eb gjat\u00ebzgjatjes s\u00eb kalimeve t\u00eb elektron\u00ebve, pajisja e par\u00eb STEAM punoi n\u00eb modalitetin e ngjeshjes. Gjat\u00ebsia e kalimit t\u00eb elektron\u00ebve n\u00eb akceleratorin linear u optimizua n\u00eb minimum ~ 350 fs (gjysm\u00eb-gjer\u00ebsi) p\u00ebrmes p\u00ebrshtatjes s\u00eb energjis\u00eb teraherce q\u00eb jepet n\u00eb kompresor dhe kalimit t\u00eb akceleratorit linear n\u00eb modalitetin e skanimit (<b>4b<\/b>).<\/p>\n<p><img decoding=\"async\" alt=\"I vog\u00ebl, por i fuqish\u00ebm: nj\u00eb linj\u00eb e vog\u00ebl e p\u00ebrshpejtuesit t\u00eb grimcave q\u00eb vendosi nj\u00eb rekord t\u00eb ri\" src=\"\/wp-content\/uploads\/2019\/07\/f4c887b0cd58549da2bdc3a25ebab294.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>Imazhi \u21164<\/i><\/p>\n<p>Gjat\u00ebsia minimale e kalimit u vendos n\u00eb p\u00ebrputhje me gjat\u00ebsi t\u00eb impulsit UV t\u00eb fotokatod\u00ebs, e cila ishte ~ 600 fs. Ndarja midis kompresorit dhe vij\u00ebs, e cila kufizonte forc\u00ebn e ngjeshjes p\u00ebr shpejt\u00ebsin\u00eb, kishte gjithashtu nj\u00eb rol t\u00eb r\u00ebnd\u00ebsish\u00ebm. N\u00eb p\u00ebrgjith\u00ebsi, k\u00ebto masa mund\u00ebsojn\u00eb sakt\u00ebsin\u00eb femtosekondare t\u00eb faz\u00ebs s\u00eb futjes n\u00eb faz\u00ebn e akcelerimit.<\/p>\n<p>N\u00eb imazhin <b>4a<\/b> \u00cbsht\u00eb e qart\u00eb se p\u00ebrhapja e energjis\u00eb s\u00eb rrezeve elektronike t\u00eb ngjeshura pas p\u00ebrshpejtimit t\u00eb optimizuar n\u00eb akseleratorin linear zvog\u00eblohet n\u00eb ~ 4 her\u00eb krahasuar me at\u00eb t\u00eb ngjeshur. Fal\u00eb p\u00ebrshpejtimit, spektri energjetik i rrezeve t\u00eb ngjeshura zhvendoset drejt energjive m\u00eb t\u00eb larta, ndryshe nga rrezet e ngjeshura. Pika e spektrit energjetik pas p\u00ebrshpejtimit arrin rreth 115 keV, nd\u00ebrsa bishti me energji t\u00eb lart\u00eb arrin rreth 125 keV.<\/p>\n<p>K\u00ebto rezultate, sipas deklaratave modeste t\u00eb shkenc\u00ebtar\u00ebve, jan\u00eb nj\u00eb rekord i ri p\u00ebrshpejtimi (deri n\u00eb p\u00ebrshpejtim ka qen\u00eb 70 keV) n\u00eb gam\u00ebn terahertz.<\/p>\n<p>Por, p\u00ebr t\u00eb zvog\u00ebluar p\u00ebrhapjen e energjis\u00eb (<i>4a<\/i>), \u00ebsht\u00eb e nevojshme t\u00eb arrihet nj\u00eb rrez\u00eb edhe m\u00eb e shkurt\u00ebr. <\/p>\n<p><img decoding=\"async\" alt=\"I vog\u00ebl, por i fuqish\u00ebm: nj\u00eb linj\u00eb e vog\u00ebl e p\u00ebrshpejtuesit t\u00eb grimcave q\u00eb vendosi nj\u00eb rekord t\u00eb ri\" src=\"\/wp-content\/uploads\/2019\/07\/7c53a1ca68dfbe52518d1dcd813ad6c9.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>Imazhi nr. 5<\/i><\/p>\n<p>N\u00eb rastin e rrezes s\u00eb pa ngjeshur t\u00eb futur, var\u00ebsia parabolike e madh\u00ebsis\u00eb s\u00eb rrezes nga rrjedha zbulon emittanc\u00ebn p\u00ebrpar\u00ebsore n\u00eb drejtimet horizontale dhe vertikale: \u03b5x,n = 1.703 mm*mrad dhe \u03b5y,n = 1.491 mm*mrad (<b>5a<\/b>).<\/p>\n<p>Nd\u00ebrsa ngjeshja, nga ana tjet\u00ebr, p\u00ebrmir\u00ebsoi emittanc\u00ebn p\u00ebrpar\u00ebsore n\u00eb 6 her\u00eb deri n\u00eb \u03b5x,n = 0.285 mm*mrad (horizontal) dhe \u03b5y,n = 0.246 mm*mrad (vertikale).<\/p>\n<p>\u00cbsht\u00eb e r\u00ebnd\u00ebsishme t\u00eb theksohet se shkalla e reduktimit t\u00eb emetimit \u00ebsht\u00eb rreth dyfish m\u00eb e madhe se shkalla e shkurtimit t\u00eb koh\u00ebzgjatjes s\u00eb paket\u00ebs, e cila \u00ebsht\u00eb nj\u00eb mas\u00eb e jo-linjaritetit t\u00eb dinamik\u00ebs s\u00eb nd\u00ebrveprimit me koh\u00ebn, kur elektronet p\u00ebrjetojn\u00eb fokusim dhe defokusim t\u00eb fort\u00eb t\u00eb fush\u00ebs magnetike gjat\u00eb shpejtimit (<b>5b<\/b> dhe <b>5c<\/b>).<\/p>\n<p>N\u00eb imazhin <b>5b<\/b> \u00ebsht\u00eb e qart\u00eb se elektronet e futur n\u00eb koh\u00ebn optimale p\u00ebrjetojn\u00eb t\u00ebr\u00eb gjysm\u00ebperiudh\u00ebn e shpejtimit t\u00eb fush\u00ebs elektrike. Nd\u00ebrkaq, elektronet q\u00eb arrijn\u00eb p\u00ebrpara ose pas momentit optimal p\u00ebrjetojn\u00eb shpejtim m\u00eb t\u00eb ul\u00ebt dhe madje ngadal\u00ebsim t\u00eb pjessh\u00ebm. Si rezultat, k\u00ebto elektrone marrin m\u00eb pak energji, n\u00eb terma t\u00eb p\u00ebrgjithsh\u00ebm.<\/p>\n<p>Nj\u00eb situat\u00eb e ngjashme v\u00ebrehet edhe n\u00eb ndikimin e fush\u00ebs magnetike. Elektronet e futur n\u00eb koh\u00ebn optimale p\u00ebrjetojn\u00eb nj\u00eb sasi simetrike t\u00eb fushave magnetike pozitive dhe negative. N\u00ebse futja e elektron\u00ebve ndodhi para koh\u00ebs optimale, kishte m\u00eb shum\u00eb fusha pozitive dhe m\u00eb pak negative. N\u00eb rastin e futjes s\u00eb elektron\u00ebve pas koh\u00ebs optimale \u2014 kishte m\u00eb pak fusha pozitive dhe m\u00eb shum\u00eb negative (<b>5c<\/b>). K\u00ebto devijime \u00e7ojn\u00eb n\u00eb at\u00eb q\u00eb elektroni mund t\u00eb devijoj\u00eb majtas, djathtas, lart ose posht\u00eb, n\u00eb var\u00ebsi t\u00eb pozicionit t\u00eb tij n\u00eb raport me boshtin, \u00e7ka rezulton n\u00eb rritjen e impulsit trinor, i cili i korrespondon fokusimit apo defokusimit t\u00eb rrezes.<\/p>\n<p>P\u00ebr nj\u00eb njohje m\u00eb t\u00eb detajuar me nuancat e hulumtimit, rekomandoj t\u00eb shikoni n\u00eb <noindex><a rel=\"nofollow\" href=\"https:\/\/www.osapublishing.org\/optica\/fulltext.cfm?uri=optica-6-7-872&amp;id=415315\">raportin e shkenc\u00ebtar\u00ebve<\/a><\/noindex> dhe <noindex><a rel=\"nofollow\" href=\"https:\/\/osapublishing.figshare.com\/articles\/3990773_pdf\/8231024\">materiale shtes\u00eb<\/a><\/noindex> p\u00ebr t\u00eb.<\/p>\n<h3>Epilogu<\/h3>\n<p>\nN\u00eb p\u00ebrmbledhje, performanca e p\u00ebrshpejtuesit do t\u00eb p\u00ebrmir\u00ebsohet n\u00eb rast t\u00eb reduktimit t\u00eb gjat\u00ebsi s\u00eb rrezes s\u00eb elektron\u00ebve. N\u00eb k\u00ebt\u00eb punim, gjat\u00ebsi e arritshme e rrezes ishte e kufizuar nga geometria e pajisjes. Por, n\u00eb teori, gjat\u00ebsi e rrezes mund t\u00eb arrij\u00eb dhe m\u00eb pak se 100 fs. <\/p>\n<p>Po ashtu, shkenc\u00ebtar\u00ebt theksojn\u00eb se cil\u00ebsia e rrezes mund t\u00eb p\u00ebrmir\u00ebsohet m\u00eb tej duke reduktuar lart\u00ebsin\u00eb e shtresave dhe duke rritur numrin e tyre. Megjithat\u00eb, ky metod\u00eb nuk \u00ebsht\u00eb pa probleme, ve\u00e7an\u00ebrisht n\u00eb rritjen e kompliksitetit t\u00eb prodhimit t\u00eb pajisjes.<\/p>\n<p>Ky punim \u00ebsht\u00eb nj\u00eb hap fillestar n\u00eb nj\u00eb studim m\u00eb t\u00eb gjer\u00eb dhe m\u00eb t\u00eb detajuar mbi versionin miniatur\u00eb t\u00eb p\u00ebrshpejtuesit linear. Megjith\u00ebse versioni i provuar tashm\u00eb tregon rezultate t\u00eb shk\u00eblqyera q\u00eb mund t\u00eb quhen me t\u00eb drejt\u00eb rekord, ka ende shum\u00eb pun\u00eb p\u00ebr t\u00eb b\u00ebr\u00eb. <\/p>\n<p>Fal\u00ebnderoj p\u00ebr v\u00ebmendjen, q\u00ebndroni kurioz\u00eb dhe gjith\u00eb t\u00eb mirat p\u00ebr nj\u00eb jav\u00eb t\u00eb mbar\u00eb, guys! \ud83d\ude42<\/p>\n<p>Faleminderit q\u00eb jeni me ne. Ju p\u00ebrqejn\u00eb artikujt tan\u00eb? Doni t\u00eb shihni m\u00eb shum\u00eb materiale interesante? Na mb\u00ebshtesni me nj\u00eb porosi ose duke na rekomanduar miqve tuaj, <b>30% zbritje p\u00ebr p\u00ebrdoruesit e Habra p\u00ebr nj\u00eb alternativ\u00eb unike t\u00eb server\u00ebve entry-level, e cila \u00ebsht\u00eb krijuar nga ne p\u00ebr ju:<\/b> <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/company\/ua-hosting\/blog\/347386\/\">E gjith\u00eb e v\u00ebrteta rreth VPS (KVM) E5-2650 v4 (6 Ndot\u00ebs) 10GB DDR4 240GB SSD 1Gbps nga $20, ose si ta ndash n\u00eb m\u00ebnyr\u00eb t\u00eb duhur serverin?<\/a><\/noindex> (disponohen variante me RAID1 dhe RAID10, deri n\u00eb 24 b\u00ebrthama dhe deri n\u00eb 40GB DDR4).<\/p>\n<p><b>Dell R730xd p\u00ebr dy her\u00eb m\u00eb lir\u00eb?<\/b> Vet\u00ebm k\u00ebtu <b><noindex><a rel=\"nofollow\" href=\"https:\/\/ua-hosting.company\/serversnl\">2 x Intel TetraDeca-Core Xeon 2x E5-2697v3 2.6GHz 14C 64GB DDR4 4x960GB SSD 1Gbps 100 TB nga $199<\/a><\/noindex> n\u00eb Holand\u00eb! <b>Dell R420 \u2014 2x E5-2430 2.2Ghz 6C 128GB DDR3 2x960GB SSD 1Gbps 100TB \u2014 nga $99!<\/b><\/b> Lexoni rreth <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/company\/ua-hosting\/blog\/329618\/\">Si t\u00eb nd\u00ebrtosh nj\u00eb infrastruktur\u00eb t\u00eb klas\u00ebs korporative me p\u00ebrdorimin e server\u00ebve Dell R730xd E5-2650 v4 me \u00e7mim prej 9000 euro p\u00ebr pak para?<\/a><\/noindex><br \/>\n<br \/>Burimi: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/ua-hosting\/blog\/460195\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041f\u0440\u0438\u0432\u044b\u0447\u043d\u044b\u0439 \u043d\u0430\u043c \u043f\u0440\u0438\u043d\u0446\u0438\u043f \u00ab\u0431\u043e\u043b\u044c\u0448\u0435 \u0437\u043d\u0430\u0447\u0438\u0442 \u043c\u043e\u0449\u043d\u0435\u0435\u00bb \u0443\u0436\u0435 \u0434\u0430\u0432\u043d\u043e \u0443\u0441\u0442\u043e\u044f\u043b\u0441\u044f \u0432 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