English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Zendy Plus

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Zendy Tools

Zendy Open

We discuss the operational principle and performance of new micro-patterngaseous detectors based on the multi-layer Thick Gaseous Electron Multiplier(M-THGEM) concept coupled to a needle-like anode. The new gas avalanchestructure aims at high-gain operation in nuclear physics and nuclearastrophysics applications with radioactive isotope beams. It is thereafternamed TIP-HOLE gas amplifier, and consists of a THGEM or a two-layers M-THGEMmounted in a WELL configuration. The avalanche electrodes are collected by thinconductive needles (with up to a few ten um radius and a height of 100 um),located at the center of the hole and acting as point-like anode. The bottomarea of the needle may be surrounded by a cylindrical cathode strip in order toincrease the electron collection efficiency. The electric field lines from thedrift region above the M-THGEM are focused into the holes, and then forced toconverge on the needle tip. An extremely high field is reached at the top ofthe needle, creating a point-like avalanche process. Stable, high-gainoperations in a wide range of pressures may be achieved at relatively lowoperational voltage, even in pure quencher gas at atmospheric pressure (e.g.pure isobutene). The TIP-HOLE structure may be produced by the innovativescalable additive manufacturing technology for large-area, multiple-layerprinted circuit boards, recently developed by the UHV technology company (USA)and discussed for the first time in this work.

Development of the TIP-HOLE gas avalanche structure for nuclear  physics/astrophysics applications with radioactive isotope beams: preliminary  results