Development of detector active element based on thgem

A thick gas electron multiplier is considered for radiation-hard detectors (hadron calorimeter). There was carried out technological and design study to optimize the element structure. The measurements results and the next plans are presented.Comment: 7 pages, 12 figure

Development, Production and Testing of 4500 Beam Loss Monitors

Beam-loss monitoring (BLM) [1] is a key element in the LHC machine protection. 4250 nitrogen filled ionization chambers (IC) and 350 secondary emission monitors (SEM) have been manufactured and tested at the Institute for High Energy Physics (IHEP) in Protvino, Russia, following their development at CERN. Signal speed and robustness against aging were the main design criteria. Each monitor is permanently sealed inside a stainless-steel cylinder. The quality of the welding was a critical aspect during production. The SEMs are requested to hold a vacuum of $10^{-7}$ bar. Impurity levels from thermal and radiationinduced desorption should remain in the range of parts per million in the ICs. To avoid radiation aging (up to $2·10^{8}$ Gy in 20 years) production of the chambers followed strict UHV requirements. IHEP designed and built the UHV production stand. Due to the required dynamic range of $10^{8}$, the leakage current of the monitors has to stay below 2 pA. Several tests during and after production were performed at IHEP and CERN. A consistently high quality during the whole production period was achieved and the tight production schedule kept at the same time

Present Foreign Policy of Lithuania

Article is devoted to various aspects of Lithuanian foreign policy after parliamentary 2008 and presidential 2009 elections, in particular relations of Lithuania with Russia and the European Union. The main attention is paid to the interdependence of Lithuanian internal and foreign policy

New species of Astragalus L. (Leguminosae) sect. Hololeuce, Onobrychoidei, Ornithopodium and Synochreati and a new section Baldaccia

Volume: 8Start Page: 155End Page: 16