GEM R&D Update

Kondo Gnanvo

K. Gnanvo - SoLID Coll. Meeting, 02/03/12 Page 2

Outline

GEM R&D and assembly facilities at UVa

Cosmic test results

Update on the 40 × 50 cm2 GEM prototype

Plans and requirement for SoLID GEM chamber

K. Gnanvo - SoLID Coll. Meeting, 02/03/12 Page 3

GEM R&D and assembly facility at UVa

A 3.5 × 3 m2 class 1000 clean room Used for the assembly of BigBite drift chambers

and GEM tracker with 10 × 10 cm2 chambers Accessories (clean room table, HV Gas box,…. Additional clean room to be added later this year

Assembly of the large chamber Ultrasonic bath model Elmasonic S900H (Jlab)

for the GEM spacers and the stretcher parts Liquid dispenser unit (Fisnar JB1113-Lf)

Setting up the GEM lab @ UVa the test and commissioning of the chambers 16 channels Wiener HV power supply (VME) Picoammeter model Keithley 6487

K. Gnanvo - SoLID Coll. Meeting, 02/03/12 Page 4

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

Design from the 1st SBS GEM prototype By E. Cisbani (INFN Roma/Catania, Italy) We are implementing some minor improvement Drawings almost completed and will be sent to

production soonBy E. Cisbani (INFN Roma/Catania, Italy)

K. Gnanvo - SoLID Coll. Meeting, 02/03/12 Page 5

GEM R&D and assembly facility at UVa

10 × 10 cm2 GEM prototypes

3 working chambers for the tracker,

2 mores to be assembled soon

trigger GEM chamber with pad readout

Scalable Readout System (SRS)

Multi channel scalable readout system developed by the CERN-based RD51 coll.

Small system @ UVa with up to 2048 ch 4 small GEM chambers with X/Y readout

Currently running with a standalone ALICE DAQ (DATE) and Monitoring (AMORE) software.

Integration of the SRS into CODA under development

K. Gnanvo - SoLID Coll. Meeting, 02/03/12 Page 6

Outline

GEM R&D and assembly facilities at UVa

Cosmic test results

Update on the 40 × 50 cm2 GEM prototype

Plans and requirement for SoLID GEM chamber

K. Gnanvo - SoLID Coll. Meeting, 02/03/12 Page 7

Cosmic test results

GEM1 X-strips

GEM1 Y-strips

GEM2 X-strips

GEM2Y-strips

Tracker with small chambers at Jlab for a couple of weeks last December Chinese group made with HV scan data

We also set up a tracker at JLab

K. Gnanvo - SoLID Coll. Meeting, 02/03/12 Page 8

Cosmic test results

Charge sharing between X-strips and Y-strips Problem with the charge distribution for GEM1 One possible reason can be geometry induction gap different than 2 mm

X/Y correlation used to resolve hits from multi hits events

GEM2 GEM1

K. Gnanvo - SoLID Coll. Meeting, 02/03/12 Page 9

Test Run

Test Run at Jlab in March 2012:

2 or 3 UVa small GEM chambers will be used as tracker

We will also provide the SRS readout system with DATE and AMORE

We are also working on the software to get the root file format for further analysis

Plans for tests at UVa:

We want to set up the bench for gain measurement of the GEM chambers

Do some R&D for the trigger GEM with pad readout Geometry an Gas mixture to improve time resolution of the chamber Test the digital readout SRS development with VFAT chip

K. Gnanvo - SoLID Coll. Meeting, 02/03/12 Page 10

Outline

GEM R&D and assembly facilities at UVa

Cosmic test results

Update on the 40 × 50 cm2 GEM prototype

Plans and requirement for SoLID GEM chamber

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

Update on the 40×50 cm2 GEM prototype

11

We have received several components for the SBS GEM prototype 7 GEM foils from CERN workshop (6 for 2 prototypes + a spare one) 2 bad GEMs foils to be used as mockup for the training on the stretching The spacer frames from RESARM (Belgium) The Araldite epoxy glue and Conformal coating for sealing the chamber

We are still waiting for the X/Y strips readout board 3 readouts under production at CERN 2 different designs that we would like to test (see next slides) Expect to be delivered by the end of February 2012

We are working on the design and production of the stretcher The stretcher is to apply tension on the GEM foil during assembly to glue it to the spacer Design and production on going

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

Update on the 40 × 50 cm2 GEM prototype

Some modification on the initial SBS readout design Increasing the area for grounding to improve the noise level Replace the ZIF connectors by the Panasonic connectors 2 GEM prototypes will be built one with each readout design

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

ZIF connectors Panasonic connectors

K. Gnanvo - SoLID Coll. Meeting, 02/03/12 Page 13

Update on the 40 × 50 cm2 GEM prototype

Modification of the design for AnDY GEM Change the readout board design to the design of

TERA triple-GEM readout board Try a new gas flow system through a change in

the design of the spacer frames Modify the HV sectors design on the GEM foil

New design to: Facilitate the assembly procedure Enhance the chambers performances Could be used for the SBS chambers

K. Gnanvo - SoLID Coll. Meeting, 02/03/12 Page 14

Outline

GEM R&D and assembly facilities at UVa

Cosmic test results

Update on the 40 × 50 cm2 GEM prototype

Plans and requirement for SoLID GEM chamber

K. Gnanvo - SoLID Coll. Meeting, 02/03/12 Page 15

Plans and requirement for SoLID GEM prototype

K. Gnanvo - SoLID Coll. Meeting, 02/03/12 Page 16

Plans and requirement for SoLID GEM prototype

K. Gnanvo - SoLID Coll. Meeting, 02/03/12 Page 17

Plans and requirement for SoLID GEM prototype

K. Gnanvo - SoLID Coll. Meeting, 02/03/12 Page 18

Plans and requirement for SoLID GEM prototype

SoLID need large size GEM modules

CERN can produce as large as 200 × 50 cm2 GEM foils thanks to the single mask technology

Largest GEM chamber by CMS GEM Collaboration for High Eta region Muon Chambers

RD51 is looking for possibility for industrial partner Production of large volume and large size GEM foils NewFlex in Korea

We are going to start the design of SoLID GEM prototype

We received some drawings from CMS prototype (Archana Sharma)

CMS GEM prototype 99 cm × (22 - 45) cm

K. Gnanvo - SoLID Coll. Meeting, 02/03/12 Page 19

GEM Team at UVa

Senior Research Scientist: Prof. Nilanga Liyanage Vladimir Nelyubin

Research Scientist: Kondo Gnanvo

Graduate Students: Kiadtisak Saenboonruang Taylor Sholz

K. Gnanvo - SoLID Coll. Meeting, 02/03/12 Page 20

Backup Slides

K. Gnanvo - SoLID Coll. Meeting, 02/03/12 Page 21

• Multiplication stages shielded from each other: reduced feed back• Slow Positive ions localized in the holes away from the induction region • Most of the electrons contribute to signal: can operate at low gains• Much higher rates than wire chambers: ~ 50 MHz/cm2

K. Gnanvo - SoLID Coll. Meeting, 02/03/12 Page 22

Cosmic test results with 10 × 10 cm2 GEM

Total charge distribution and charge sharing in X and Y strips in GEM2

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First results with 10 × 10 cm2 GEM Prototype

Some results from cosmic test at Jlab Chinese group

K. Gnanvo - SoLID Coll. Meeting, 02/03/12 Page 24

Plans and requirement for SoLID GEM prototype