{"id":103,"date":"2024-11-12T17:38:56","date_gmt":"2024-11-12T16:38:56","guid":{"rendered":"https:\/\/www.icp.universite-paris-saclay.fr\/clio\/?page_id=103"},"modified":"2024-11-14T14:23:34","modified_gmt":"2024-11-14T13:23:34","slug":"characteristics-of-the-fel","status":"publish","type":"page","link":"https:\/\/www.icp.universite-paris-saclay.fr\/clio\/en\/characteristics-of-the-fel\/","title":{"rendered":"Characteristics of the FEL"},"content":{"rendered":"

Characteristics of the FEL<\/h3>\n
\n\t

Free Electron Lasers (FEL) belong to the family of accelerators, similar to \"synchrotrons\" that produce radiation across a spectral range from UV to extreme X-rays. However, FELs are lasers distinguished by their monochromaticity and high intensity. By their nature, FELs are inherently pulsed on the picosecond scale and offer tunable wavelengths over a broad spectral range.<\/p>\n

CLIO operates with an electron accelerator (radio-frequency linear accelerator). The full spectral range of CLIO is covered in several segments, each corresponding to a specific electron beam energy: from 45 MeV to 12 MeV (see accelerator specifications at the bottom of the page).<\/p>\n<\/div>\n<\/div><\/div><\/div>

\n
\n\t\t\"\"\n\t<\/div>\n\n<\/div><\/div><\/div><\/div>

CLIO Performance<\/h3>\n
\n\t\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Spectral range \u03bb<\/td>\n5 \u00b5m to 150 \u00b5m = 66 cm-1<\/sup> to 2000 cm-1<\/sup><\/td>\n<\/tr>\n
Spectral width \u2206\u03bb\/\u03bb :<\/td>\n\u2245 1%<\/td>\n<\/tr>\n
Pulse duration<\/td>\n1 to 10 ps<\/td>\n<\/tr>\n
Peak Power<\/td>\n10 MW to 100 MW<\/td>\n<\/tr>\n
\n

Temporal structure of pulses:<\/p>\n

Macro-pulses of \u2206t = 10 \u00b5s at a rate of 25 Hz<\/p>\n

Micro-pulses of \u03b4t = 10 ps separated by 16 ns<\/p>\n<\/td>\n

\"\"<\/td>\n<\/tr>\n
Laser energy :<\/td>\n<\/td>\n<\/tr>\n
average<\/td>\n1 to 2 J per seconde<\/td>\n<\/tr>\n
macro-pulse<\/td>\n40 mJ<\/td>\n<\/tr>\n
micro-pulse<\/td>\n65 \u00b5J<\/td>\n<\/tr>\n
Laser power :<\/td>\n<\/td>\n<\/tr>\n
average<\/td>\n1 to 2 W<\/td>\n<\/tr>\n
macro-pulse<\/td>\n4 kW<\/td>\n<\/tr>\n
micro-pulse<\/td>\n6 MW<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div><\/div>
\n
\n\t\t\"\"\n\t<\/div>\n\n<\/div><\/div>
\n
\n\t

Spectral range of the CLIO laser for various electron beam energies (12 to 45 MeV). The 2-4 \u00b5m range operates on the 3rd harmonic of the undulator.<\/em><\/p>\n<\/div>\n<\/div><\/div>

Specifications of the CLIO Electron Accelerator<\/h3>\n
\n\t\n\n\n\n\n\n\n\n\n\n
Energy Range<\/td>\n12 to 45 MeV<\/td>\n<\/tr>\n
Charge \/ micro-pulse<\/td>\n1 nC<\/td>\n<\/tr>\n
Peak Current<\/td>\n50 A (in 10 ps micro-pulse)<\/td>\n<\/tr>\n
Average Current<\/td>\n80 mA (in10 \u00b5s macro-pulse)<\/td>\n<\/tr>\n
Emittance<\/td>\n200 \u03c0 mm.mrd (90% of electrons)<\/td>\n<\/tr>\n
RF Frequency<\/td>\n3 GHz<\/td>\n<\/tr>\n
Pre-buncher Frequency<\/td>\n500 MHz<\/td>\n<\/tr>\n
Gun Type<\/td>\nthermoionic<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div><\/div>

Smith-Purcell Radiation Measurement (Nicolas Delerue, IJClab) <\/h3>\n
\n\t

The work on coherent Smith-Purcell radiation within the accelerator group at IJCLab investigates how it can be used to measure the longitudinal profile of electron bunches. For this purpose, a detector to measure this radiation was developed and installed at the CLIO accelerator. When an electron bunch passes near a metallic diffraction grating, it induces a current in the grating. Oscillations of this current on the grating surface lead to radiation emission. If the bunch is shorter than the emitted wavelength, the radiation will be more coherent and much more intense. Measuring the coherent Smith-Purcell radiation allows for the determination of the bunch's length and longitudinal profile.<\/p>\n<\/div>\n<\/div><\/div><\/div><\/div><\/div>","protected":false},"excerpt":{"rendered":"

Free Electron Lasers (FEL) belong to the family of accelerators, similar to \u00ab\u00a0synchrotrons\u00a0\u00bb that produce radiation across a spectral range from UV to extreme X-rays. However, FELs are lasers distinguished by their monochromaticity and high intensity. By their nature, FELs are inherently pulsed on the picosecond scale and offer tunable wavelengths over a broad spectral… Lire la suite »Characteristics of the FEL<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"off","neve_meta_content_width":100,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":"","footnotes":""},"class_list":["post-103","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.icp.universite-paris-saclay.fr\/clio\/wp-json\/wp\/v2\/pages\/103","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.icp.universite-paris-saclay.fr\/clio\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.icp.universite-paris-saclay.fr\/clio\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.icp.universite-paris-saclay.fr\/clio\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.icp.universite-paris-saclay.fr\/clio\/wp-json\/wp\/v2\/comments?post=103"}],"version-history":[{"count":2,"href":"https:\/\/www.icp.universite-paris-saclay.fr\/clio\/wp-json\/wp\/v2\/pages\/103\/revisions"}],"predecessor-version":[{"id":170,"href":"https:\/\/www.icp.universite-paris-saclay.fr\/clio\/wp-json\/wp\/v2\/pages\/103\/revisions\/170"}],"wp:attachment":[{"href":"https:\/\/www.icp.universite-paris-saclay.fr\/clio\/wp-json\/wp\/v2\/media?parent=103"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}