Zig Zag at ElviaS. Aune

MPGD-4-LDRD

Elvia, French PCB company

• French leader in PCB, with several plants in France (CA ~75 M€)• For standard PCB and bulk: Coutance.

• Collaboration since 15 years on PCB for micromegas

• In 2012 technologic transfer for the Bulk process• Elvia realized bulk detector for the scan pyramid project.

• For the Saclay Bulk Lab, close collaboration with Elvia for:• Screen printing• Insulation mask an material• PCB and Kapton manufacturing• Bulk process

Laser test at Elvia / Coutance in October 2017Pico Flex, a laser machine for cutting and drilling PCB and KaptonCO2 laser of 20 µm (different focusing under consideration)Test on PCB with 9 µm copper

Laser test at Elvia / Coutance in October 2017Maximum PCB seize: 630 x 620 mm, active area: 600 x 590 mmGerber file to be re work for native machine soft: give the laser traject with 20 µm wide “laser pencil”Two parameter for etching the copper (and not the pcb): laser power (8 W) and number of pass (12)Time for 5x5 cm² of zig zag = ~ 1 min (if 5 µm copper divide by two)

Laser video

Laser test at Elvia / Coutance in October 2017

Gerber from Alexander

Laser test at Elvia / Coutance in October 2017

After laser etching, and chemical etching (0.5 µm removal) to remove small “items”

Cut view

9 µm

20 µm

Strait strips = easy

20 µm inter

Zig zag test 2

Issue with the end of the triangle !Must be rounded ?

Zig Zag pattern = OK

Diamond pattern

OK, but end of diamond to be rounded ?

Diamond: bad try

The 20 µm laser overlap not good !

Next test• A RD3 zig zag to be made in January 2018

• Remove the copper by chemical etching all around active area

• Laser the active area, with chemical etching finish

• Ni-Gold finishing (tbc)