The Bigbite second GEM tracker

SBS GEM TrackersFront TrackerGeometry

x6

18 modulesIn Italy

50 cm x 40 cm Modules are assembled to form larger chambers with different sizes Front tracker: Six 40 cm x 150 cm GEM layers

INFN Funding: to be built in Italy Polarimeter trackers: Eight 50 cm x 200 cm

GEM layers to be built in Virginia

76 modulesIn Virginia

Collaboration: INFN (Roma,

Genova, Catania, Bari)

and UVaSBS GEM trackers will form the largest area GEM tracker in the

world

Fabricate 29 GEM modules by Oct 2014. Assemble and test at least one 50 cm x 200 cm GEM layer ( 5

modules) for Bigbite. Our plan is to build 12 (of the 29) SBS modules and instrument

them with APV electronics in 2013. So it will be possible to assemble two back GEM layers for BB in

time for A1n. All costs are budgeted into SBS WBS 2; no extra cost to A1n. Graduate students from UVa for installation and commissioning.

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UVa component of SBS WBS 2 (Neutron FF)

A 3.5 m x 3 m level-1000 clean-room at UVa Clean room in a 4 m x 10 m semi-clean (1000 level) area. Equipment to build 40 cm x 50 cm SBS modules:

GEM foil stretcher, with tension monitoring Dry N2 HV box, with picoammeter, for testing GEM foils Large ultra-sonic bath for cleaning frames

APV 25 readout system developed in Italy, going into production now

Two APV25 based readout systems with 5000 channels for testing GEMs: these systems being incorporated into CODA now.

Wiener MPOD High Voltage system with 16 sensitive HV channels GEM chamber prototyping

INFN and UVa groups have built and tested seven 10 cm x 10 cm prototypes

40 cm x 50 cm module design complete, has been optimized with two prototypes.

Two 40 x 50 cm prototypes built in Italy, two more at UVa.4

Preparations for the SBS GEM project

Prototype GEM tracker tests and results

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10 cm x 10 cm prototype GEM tracker preared to go into hall A

70 mm position

resolution

Charge deposition correlation

between x and y stripes

GEM module construction status at UVa

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All parts for 2 chambers now at hand: Readout planes arrived 2 weeks ago. – 1 Rome type + 2 Uva

type Spent about 2 months developing techniques for GEM assembly

Used test frames and foils Final procedure well established now.

Final assembly of the first chamber (Uva type) this week and next week

Readout and 2 GEMs already glued and tested. 1 more GEM, Cathode and gas window by early next week. Finish assembly by end of next week.

SBS readout ( E.Cisbani, INFN Italy) New design (K. Gnanvo. Uva)

Panasonic connectorsZIF connectors

GEM module construction status at UVa

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New 40 cm x 50 cm GEM stretcher at Uva

GEM foil and Frame HV test box

Fully equipped INFN 40x50 cm2

GEM module for a beam test at DESY

Clean room at UVa

GEM R&D and assembly facility at UVa The mechanical stretcher

Use for stretching GEM foil and glue it to spacer frames to keep it flat

Stretch the foil to a tension bigger than 1kg/cm

Method developed by Bencivenni. Et al. (LNF Italy) for LHCb GEM chambers\

New 40 cm x 50 cm GEM stretcher at Uva

Test frames glued

GEM R&D and assembly facility at UVa

GEM foil and Frame HV test box: -• check for curent (sector current < 5 nA) and sector capacitance.The 3 foils tested so far have been good.• Test foils were bad (higher currents)

GEM R&D and assembly facility at UVa

K. Gnanvo - SoLID Coll. Meeting, 02/03/12

The Bigbite second GEM tracker

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