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Research and development of Micromegas detector and related devices (Project N° 4304-1)

Research and development of Micromegas detector and related devices (Project N° 4304-1) . Updated progress report and extension request. P. Colas, S. Mukhopadhyay. CEFIPRA Scientific Council, Dinard, France, May 21, 2014. What is a Micromegas Time Projection Chamber ?

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Research and development of Micromegas detector and related devices (Project N° 4304-1)

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  1. Research and development of Micromegas detector and relateddevices(Project N° 4304-1) Updatedprogress report and extension request P. Colas, S. Mukhopadhyay CEFIPRA Scientific Council, Dinard, France, May 21, 2014

  2. Whatis a Micromegas Time Projection Chamber? • Studieswithsmall prototypes • The Large Prototype • Software studies, analysis of distortions • The PhDstudent Deb Sankar Bhattacharya • Recentachievements • Plans Updated report

  3. First meeting in Saclay in December 2008, discussing possible collaborations • First travelfrom France to India in January 2010. Application to CEFIPRA. • Started April 1, 2011, due to end on March 31, 2014, extension to January 31, 2016. • Documents written : detailedproject March 2009, annual report from April 2011 to March 2012, mid-term report presented on Nov. 17, 2012 at the CEFFIPRA S.C. in Aurangabad, the extension proposalin October 2013, thisupdatedprogress report and extension request. History of the project 4304-1

  4. S1 S2 Y. Giomataris, Ph. Rebourgeard, JP Robert and G. Charpak, NIM A 376 (1996) 29 MicromeshGaseousChamber: a micromeshsupported by 50-100 mm insulatingpillars, and held at Vanode – 400 V Multiplication (up to 105 or more) takes place between the anode and the mesh and the charge iscollected on the anode (one stage) Funnelfieldlines: electrontransparencyvery close to 1 for thinmeshes Small gap: fast collection of ions S2/S1 = Edrift/Eamplif ~ 200/60000= 1/300 Micromegas: How does it work?

  5. t electrons diffuse and drift due to the E-field Ionizing Particle electrons are separated from ions E B A magnetic field reduces electron diffusion y x Micromegas TPC : the amplification is made by a Micromegas Localization in time and x-y TPC: Time Projection Chamber

  6. Full equipment of the SINP lab for small detector studies, and procuration of Micromegas detectors by the Saclay team • Study of various gaps and geometry and comparisonwith simulation • 2 publications (NIM and JINST) Workwithsmall prototypes

  7. Ion backflowmeasurements in Saclay with the Indian team. Workwithsmall prototypes

  8. New small TPC built at SINP

  9. Joined SINP in January 2013 Registered in PhD at JadavpurUniversity, withadvisors S. Mukhopadhyay, A. Bhattacharya and P. Colas. PhD to bedefended in Kolkata, in January 2016. Fullypayed on CEFIPRA funds SINP Saclay SINP SINP Saclay 2014 2015 2013 The student Deb Sankar Bhattacharya

  10. Built by LCTPC collaboration Magnet and cooling plant by KEK, Tsukuba Equipped by Saclay withresistive anode Micromegas. Coolingtested in February 2014 at DESY The Large prototype

  11. Events in the Large Prototype

  12. ‘Software week’ in Saclay, wherewework on the track reconstruction and analysis. Analysis and software

  13. Distortionsfrom the Large Prototype

  14. Inhomogeneity of the Electric fieldnear the edges of the modules inducesdistortions (evenat B=0) AlsoinducesExBeffects Changes in E also changes the drift velocity Add up to mechanicalmisalignment Detailed module edgelayout Distortionsfrom the Large Prototype

  15. Inhomogeneity of the Electric fieldnear the edges of the modules inducesdistortions (evenat B=0) AlsoinducesExBeffects Changes in E also changes the drift velocity Add up to mechanicalmisalignment Calculations by S. Mukhopadhyay Distortionsfrom the Large Prototype

  16. Lots of achievementsafter 3 years. • French funds not yetspent, but justenoughremains to paysalary and expenses of D.S. Bhattacharyathrough2015, mainly to studydistortions in the Large Prototype TPC • 2 weeks in Kolkata for the French team, end of October 2014: MPGD workshop and teaching. Conclusion

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