PSD12: The 12th International Conference on Position Sensitive Detectors

The transmission dynode (tynode) vacuum electron multiplier

16 Sept 2021, 08:05

1m

Teaching and Learning Building (University of Birmingham)

poster Position Sensitive Fast Timing Detectors Poster Session 4 (Position Sensitive Fast Timing Detectors)

Speaker

Harry Van Der Graaf (Nikhef National institute for subatomic physics (NL))

Description

With Atomic Layer Deposition (ALD) MEMS technology, thin multilayers have been realised which emit, after the absorption of an energetic electron at the top side, a multiple of secondary electrons at the bottom (emitting) side. In order to avoid charge-up effects, one of the layers has the function to replenish electrons and is therefore a conductor. With ALD MgO, a transmission secondary electron yield (TSEY) of 5.5 has been reached, enabling the single-electron sensitive Timed Photon Counter TipC in which a stack of 8 tynodes is placed on top of the TimePix3 or TimePix4 chip.
The alignment of 8 tynodes in a stack is obtained by applying grooves at both sides of a tynode: a glass wire in the groove is sandwiched between adjacent tynodes, locking their mutual 3D position.

Presentation materials

Harry van der Graaf.pdf