GEM R&D Update

1. GEM R&D Update Kondo Gnanvo

2. Outline GEM R&D and assembly facilities at UVa Cosmic test results Update on the 40 × 50 cm2GEM prototype Plans and requirement for SoLID GEM chamber K. Gnanvo - SoLID Coll. Meeting, 02/03/12

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 cm2chambers • 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

4. GEM R&D and assembly facility at UVa By E. Cisbani (INFN Roma/Catania, Italy) • 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 soon K. Gnanvo - SoLID Coll. Meeting, 02/03/12

5. GEM R&D and assembly facility at UVa K. Gnanvo - SoLID Coll. Meeting, 02/03/12 • 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 chamberswith X/Y readout • Currently running with a standalone ALICE DAQ (DATE) and Monitoring (AMORE) software. • Integration of the SRS into CODA under development

6. Outline GEM R&D and assembly facilities at UVa Cosmic test results Update on the 40 × 50 cm2GEM prototype Plans and requirement for SoLID GEM chamber K. Gnanvo - SoLID Coll. Meeting, 02/03/12

7. Cosmic test results GEM1 Y-strips GEM1 X-strips GEM2 X-strips GEM2 Y-strips K. Gnanvo - SoLID Coll. Meeting, 02/03/12 • 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

8. Cosmic test results GEM1 GEM2 K. Gnanvo - SoLID Coll. Meeting, 02/03/12 • 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

9. Test Run K. Gnanvo - SoLID Coll. Meeting, 02/03/12 • 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

10. Outline GEM R&D and assembly facilities at UVa Cosmic test results Update on the 40 × 50 cm2GEM prototype Plans and requirement for SoLID GEM chamber K. Gnanvo - SoLID Coll. Meeting, 02/03/12

11. Update on the 40×50 cm2 GEM prototype K. Gnanvo - SoLID Coll. Meeting, 02/03/12 • 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

12. Update on the 40 × 50 cm2 GEM prototype ZIF connectors Panasonic connectors SBS readout ( E.Cisbani, INFN Italy) New design (K. Gnanvo. Uva) • 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 K. Gnanvo - SoLID Coll. Meeting, 02/03/12

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

14. Outline GEM R&D and assembly facilities at UVa Cosmic test results Update on the 40 × 50 cm2GEM prototype Plans and requirement for SoLID GEM chamber K. Gnanvo - SoLID Coll. Meeting, 02/03/12

15. Plans and requirement for SoLID GEM prototype K. Gnanvo - SoLID Coll. Meeting, 02/03/12

16. Plans and requirement for SoLID GEM prototype K. Gnanvo - SoLID Coll. Meeting, 02/03/12

17. Plans and requirement for SoLID GEM prototype K. Gnanvo - SoLID Coll. Meeting, 02/03/12

18. Plans and requirement for SoLID GEM prototype • CMS GEM prototype • 99 cm × (22 - 45) cm • 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) K. Gnanvo - SoLID Coll. Meeting, 02/03/12

19. GEM Team at UVa K. Gnanvo - SoLID Coll. Meeting, 02/03/12 • Senior Research Scientist: • Prof. NilangaLiyanage • Vladimir Nelyubin • Research Scientist: • Kondo Gnanvo • Graduate Students: • KiadtisakSaenboonruang • Taylor Sholz

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

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

22. Cosmic test results with 10 × 10 cm2 GEM Total charge distribution and charge sharing in X and Y strips in GEM2 K. Gnanvo - SoLID Coll. Meeting, 02/03/12

23. 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

24. Plans and requirement for SoLID GEM prototype K. Gnanvo - SoLID Coll. Meeting, 02/03/12