1. INFN GEM Front Tracker 2012 Oct 18 / SBS Coll. / JLabE. Cisbani1 V. Bellini, M. Capogni, E. Cisbani, S. Colilli, F. Giuliani, M. Gricia, F. Librizzi, M. Lucentini, F. Mammoliti, F. Noto, S. Minutoli, P. Musico, R. Perrino, F. Santavenere... INFN / Bari-Lecce, Catania, Genova, Roma-Sanità SBS Collaboration Meeting Oct 18-19 2012 JLab Readout Electronics development will be presented by Paolo Musico

2. Front Chamber reqs and design Hit spatial resolution ~ 70  m Stand large background (  ~ 250 MHz/cm 2, e/  160 kHz/cm 2 ) Transverse area at least 40x120 cm 2 Event rate at the level of 20 kevents/s Reuse in different configurations 2012 Oct 18 / SBS Coll. / JLabE. Cisbani2

3. GEM base module 2012 Oct 18 / SBS Coll. / JLab E. Cisbani 3 40x50 cm 2 Large GEM module with small dead area Low material budget/Light Structure Modular design Flexible configuration Balanced weight Segmented HVs and individual protection resistors Spacers to keep gap Thin PERMAGLAS frame

4. Service Frame / Detail 42012 Oct 18 / SBS Coll. / JLabE. Cisbani External service frame made of smaller segments in carbon fiber Rigid structure, can correct small GEM module bending Prototyping under production

5. 5 Beam test @ DESY / Full Module Size 40x50 cm 2 2012 Oct 18 / SBS Coll. / JLab E. Cisbani  GEM = 400, 390, 350 V 3 mm drift gap Ar:CO2 70:30 4 GeV electron ionization: 28 pairs Gain: 17600  charge: 500 ke / 2000 ADC ch

6. 6 Parassitic beam test of new electronics/Jul-Aug 2012 2012 Oct 18 / SBS Coll. / JLab E. Cisbani

7. 7 2012/CERN Test – Event display 2012 Oct 18 / SBS Coll. / JLab E. Cisbani Event Strip Plane HV=3750 V Signal > 1000 RMS ~ 50

8. 8 2012/CERN Test – Signal development Signal saturated, and wrong clock phase  both fixed However, position information are available 2012 Oct 18 / SBS Coll. / JLab E. Cisbani

9. 9 Calibration pulse development Left: normal signal Bottom: «saturated» «Saturation» depends on the baseline level 2012 Oct 18 / SBS Coll. / JLab E. Cisbani

10. 1010 Gas Component / Radiation test We would like to use differential pressure transmitters at gas inlet and outlet to evaluate pressure drop in the chamber and any potential problem Negative Rad Hard Test 2012 Oct 18 / SBS Coll. / JLab E. Cisbani

11. 1 HV divider and Spark counter In lab test we use LNF/GEM-HV module with 7 independent HV levels and current feedback. In operation we intend to use a voltage divider (based on Olympus/Abruzzio design); Working on a simple spark counter based on standard pream components (CREMAT CR110) + some standard modules 2012 Oct 18 / SBS Coll. / JLab E. Cisbani CREMAT amp. is probably not RAD HARD

12. 1212 DAQ Bus Interface Generic Model (virtual class) MPD Library Low Level I2C Trigger ADC Other High Level Initialize Configure Discovery Read Wrapper DB Module Structured text file for configuration Based on libconfig++ Main Implemented on C++ Run on Linux MPD as independent library One configuration file (text format) Use open source libconfig++ Self consistent output binary raw data DAQ Software 2012 Oct 18 / SBS Coll. / JLab E. Cisbani Still some work on event readout library Tested on 3 VME platforms (Struck, CAEN USB and Optical) bug fixed: clock phase was not set properly.

13. 1313 Catania Tools for assembling / READY to go Clean room with gas system HV probe box and accessories GEM foil Stretcher Fiducial pin extractors Consumables... 2012 Oct 18 / SBS Coll. / JLab E. Cisbani

14. 1414 Catania Assembling Test and Training Used spare/damaged parts of the previous design to get experience in gluing/assembling gems modules (2 dummy modules assembled) 2012 Oct 18 / SBS Coll. / JLab E. Cisbani

15. 1515 Material for 6 chambers (18 GEM modules) FramesDrift foilsGEM foilsReadoutHoneycombService frame Required18 5418 6 Spare441422 (1) Procured1814577- Ordered4310311 Budget 20121428103 Budget 20139442 (+1) 2012 Oct 18 / SBS Coll. / JLab E. Cisbani 1.We have to put a large foils production order before end of Italian fiscal year, production can be delayed some months (if needed) – in addition to the CERN «natural» delay 2.We still have some margin for improvements, which will be considered after assembling and characterization

16. Short term plan ● GEM Chamber: –Assembling of the first 40x50 cm2 module will start the 22° of October (due to people previous committments) –Assembling expected to last 2 full weeks (at least) –characterize the module in lab (with rad. Sources) ● Mechanics: –Service frame prototype in production –Test service frame on three modules (first proto, training module and first final module) ● Test –November: Chance to access the RD51 test beam (second week of November) or RICH-CLAS12 at the end of November – most likely ● Electronics  Paolo Talk Expected to go into «mass» assembling early next year 2012 Oct 18 / SBS Coll. / JLab E. Cisbani 16