Hans Danielsson 1

Straw working group

Introduction

7/2/11

Hans Danielsson 2

Module 0◦ The frame is in 154◦ Straws (report by Neil and Yuriy)◦ Parts and tooling ready by the end of February

64-straw prototype:Test beam with new web and cover with TDC. (validation!)

Electronics◦ Shorter web (received), TDC (FPGA), CARIOCA

baseline Interface parts, which means integration NEW: Micromegas have been ordered for

tracking 4x (10x10cm2). Independent tracking for cosmics and test beam. (~ April)

Rate >100kHz/cm2 and s ~ 25 mm.

7/2/11

Status and plans 2011

Hans Danielsson 3

Straw material (single supplier) 65 kSFr Frames: DR and Market Survey >

300- kSFr Interface parts

◦ Workshop on detector Integration Date ? ◦ “Module 0” in September

Tooling (Installation in the experiment) Gas system Web, mechanical parts, power supplies etc.

First validation with module 0, then series production

7/2/11

Major procurement in 2011

Hans Danielsson 4

Module 0 start-up Feb. 2011◦ Finish assembly 1/7/2011

Straw production start-up in Dubna End of Jan Interface part “module 0” 1/10/2011 Assembly site at Dubna ready Jul 2011 Decision on FE baseline Jan 2011

->Ok, CARIOCA Validate TDC on cover (test beam) June

2011

Synchronization run ??? Nov. 2011

7/2/11

Milestones in 2011

Hans Danielsson 57/2/11

Spares

Working principle

1 ) Conversion stage:

Ionization of gas by the charged particle which produces electron-ion pairs.Electrons directed by E1 (0.1 to 1 kV / cm) to the micro-grid, and cross the mesh holes.

2 ) Amplification stage:

E2 (≈ 50 kV/cm) >> E1 avalanche, electrons mulitplication.

High voltage 2

cathode

Micro-grille

High voltage 1

Anode strip

Anode plane

Incident charged particle

Avalanche

e-

Conversion gap

Amplification gap

Gas

E1

E2

Shuoxing Wu08-03-2010