6x1 mm Gaps• N has to be even

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

000E+0 25E-9 50E-9 75E-9 100E-9

Time [s]

Curr

ent

at

1 A

tm [

mA] Effective

gas length

Intrinsiccapacitance

Driftvelocity

L x v/C

5 mm6 mm

(10/6) / 0.56/1

3.2 cm/µs4.5 cm/µs

1::1

Previous versionThis version

Detector Concept

• One ground “comb” milled from a solid Cu block• Four signal “combs”• Ceramic insulation/alignment pieces (machineable MACOR)

Detector mechanical design: T. Loew, D. ChengVessel mechanical design: M. HoffFabrication design: N. Salmon, A. Mei

Assembly I.

Signal comb

Alignment features(explained below)

Assembly II.Ground planes

2 mm Cu / 1 mm gap (i.e. 4 mm between plates)40 mm depth < 10::1 aspect ratio - OK for machining

Solid groundseparates all4 quadrants

Assembly III.Alignment features