IACT GudangMovies21 Rebahinxxi LK21

IACT (imaging atmospheric [or air] Cherenkov telescope [or technique]) is a device or method to detect very-high-energy gamma ray photons in the photon energy range of 50 GeV to 50 TeV.
As of 2017, there are four operating IACT systems: High Energy Stereoscopic System (H.E.S.S.), Major Atmospheric Gamma Imaging Cherenkov Telescopes (MAGIC), First G-APD Cherenkov Telescope (FACT), and Very Energetic Radiation Imaging Telescope Array System (VERITAS). The Major Atmospheric Cerenkov Experiment Telescope (MACE) is under construction in Hanle, Ladakh, India and is set to be the highest and second-largest IACT. The Cherenkov Telescope Array (CTA) is a multinational project to build next-generation IACTs and is scheduled to begin data collection in 2022.




Background


Due to the rapidly falling flux of gamma-ray photons from cosmic sources in this energy regime, space-based detectors become ineffective due to their small collection areas which are often limited to some tens or hundreds of square centimeters. In the case of the IACT, the Earth's atmosphere is used as the detection medium, implying a collection area of many hundreds of square meters. This enables IACT instruments to detect gamma-ray photons in an energy regime inaccessible to space-based instruments.




Technique


The IACT works by imaging the very short flash of Cherenkov radiation generated by the cascade of relativistic charged particles produced when a very-high-energy gamma ray strikes the atmosphere. This shower of charged particles, known as an Extensive Air Shower (EAS), is initiated at an altitude of 10–20 km. The incoming gamma-ray photon undergoes pair production in the vicinity of the nucleus of an atmospheric molecule. The electron-positron pair produced are of extremely high energy and immediately undergo Bremsstrahlung or "Braking Radiation". This radiation produced is itself extremely energetic, with many of the photons undergoing further pair production. A cascade of charged particles ensues which, due to its extreme energy, produces a flash of Cherenkov radiation lasting between 5 and 20 ns. The total area on the ground illuminated by this flash corresponds to many hundreds of square meters, which is why the effective area of IACT telescopes is so large.
The instrument used to detect the Cherenkov radiation usually comprises a large segmented mirror which reflects the Cherenkov light onto an array of photomultiplier tubes. The tubes are coupled to fast electronics which amplify, digitise and record the pattern or image of the shower. The most effective mode of operation is to use an array of such telescopes, which can be typically located 70 to 120 meters apart. The primary advantage of this mode of operation is that the energy threshold (the peak sensitivity) of the telescope can be lowered as local muons produced by cosmic ray induced showers can be eliminated. This is because the narrow Cherenkov light cone produced by local muons will only be recorded by a single telescope. The shower reconstruction and background rejection offered by an array of telescopes provides an order of magnitude increase in sensitivity and improved angular and energy resolution as compared to a single telescope. This advantage has been used to great effect by the H.E.S.S. telescope array which has detected several new sources of very high energy gamma-ray photons in recent years.




History


The IACT was pioneered by the Whipple collaboration and led to the discovery of TeV emission from the Crab Nebula in 1989. The Whipple 10m telescope also discovered the first extra-galactic source of TeV emission with the detection of very-high-energy gamma-ray emission from the active galaxy Markarian 421. The HEGRA telescope array was the first system to use multiple telescopes, a technique known as stereoscopy. The MAGIC system at the Roque de los Muchachos Observatory in La Palma began with one 17 m telescope in 2004, to which a second 17 m telescope was added in 2009. The First G-APD Cherenkov Telescope (FACT) at the Roque de los Muchachos Observatory became operational in 2011. The H.E.S.S. collaboration has added to their system in Namibia a new 28 m IACT, currently the largest IACT telescope, which has been operational since July 2012.




See also


List of telescope types
Pavel Cherenkov




References






External links


Aspera European network portal
Astroparticle physics news on Twitter
Official web page of CTA Archived 2022-04-18 at the Wayback Machine
NASA Goddard Space Flight Center - Air Cerenkov Detectors

Kata Kunci Pencarian:

• Antibiotik
• Ujaran kebencian di dunia maya
• Romy Rafael
• Astronomi
• IACT
• Tunka experiment
• Cherenkov Array at Themis
• IACT College
• High Energy Stereoscopic System
• Major Atmospheric Cerenkov Experiment Telescope
• Telescope
• Astrophysics
• Fred Lawrence Whipple Observatory
• Regulatory capture

Home - iAct

Home - iAct

iAct: Home

IACT | Industrial Automation

About Us - IACTCollege

About | iACT

About – iact tech

About – IACT

IACT College - Webway e Services

IACT Member Login.

Result | Institute for Advanced Computer Technology | IACT

Iact Logos

iact

Daftar Isi

• IACT CARGO SERVICE
• International Air Cargo Terminal Co.,Ltd.
• ホーム - 国際空港上屋株式会社
• IACT CARGO SERVICE - 国際空港上屋株式会社
• IACT CARGO SERVICE - 国際空港上屋株式会社
• HOME - 国際空港上屋株式会社
• 空港内 弊社輸入上屋年末年始の営業のご案内 - 国際空港上屋株 …
• 会社概要 - 国際空港上屋株式会社
• お問い合わせ - 国際空港上屋株式会社
• 輸入航空貨物引取り遅延に係るお詫び - 国際空港上屋株式会社

IACT CARGO SERVICE

Your snippet here

International Air Cargo Terminal Co.,Ltd.

Our Ramp & Passenger Services Presenting IACT's second core service: ramp and passenger handling operations. Through swift and safe high-quality handling, we connect both cargo and passengers to the world.

ホーム - 国際空港上屋株式会社

Feb 7, 2025 · 成田国際空港内に国内最大級の温度管理専用上屋などの特殊施設や上屋施設のほか各種地上支援機材を保有しており、空港近隣には自社施設iact成田物流センターを展開しています。

IACT CARGO SERVICE - 国際空港上屋株式会社

当社サービス利用の案内や作業依頼書、iact保税蔵置場立入証、当社案内パンフレットなどダウンロードできる書類の一覧です。

IACT CARGO SERVICE - 国際空港上屋株式会社

iactで取り扱いをしている各航空会社の到着便のスケジュール時間、到着予定時間、実到着時間が検索できます。

HOME - 国際空港上屋株式会社

IACT was established in 1963 as the 1st common import air cargo warehouse provider in Japan. As an independent company, IACT provides equitable services to all its customer airlines. Debt-free management. Using its own funds for investments and daily operations.

空港内 弊社輸入上屋年末年始の営業のご案内 - 国際空港上屋株 …

2024年 12月 吉日. お客様各位. 国際空港上屋株式会社 . 空港内 弊社輸入上屋年末年始の営業のご案内 . 拝啓 時下益々ご清栄のこととお慶び申し上げます。

会社概要 - 国際空港上屋株式会社

IACT成田物流センター 〒289-1608 千葉県山武郡芝山町岩山字井森戸114-7 【Google Map】 TEL 0479-78-8859

お問い合わせ - 国際空港上屋株式会社

お問い合わせhome>お問い合わせ 当社のサービスや業務に関するお問合せは下記の各担当部署までご連絡くだ

輸入航空貨物引取り遅延に係るお詫び - 国際空港上屋株式会社

2024年11月7日 . お 客 様 各 位. 国際空港上屋株式会社 . 輸入航空貨物引取り遅延に係るお詫び . 謹啓 貴社いよいよご清栄のこととお慶び申し上げます。