Six modules Micromegas TPC beam test & Test bench 12/4/2012W.Wang_RD51 mini week1 D. Attié, P. Colas, M. Dixit, P. Hayman, W. Wang.

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Presentation transcript:

Six modules Micromegas TPC beam test & Test bench 12/4/2012W.Wang_RD51 mini week1 D. Attié, P. Colas, M. Dixit, P. Hayman, W. Wang

7 Micromegas modules with integration of electronics /4/2012W.Wang_RD51 mini week2

6 Modules Test Cosmic event In July 2012, 6 modules were installed on the endplate of LP-TPC at DESY and tested at the same time. Data were taken with cosmic rays and 5 GeV e- beam. 12/4/2012W.Wang_RD51 mini week3

12/4/2012W.Wang_RD51 mini week4 Event display (the first 100 triggers of a good run) Each module has 1726 pads (24 rows x72 columns)

Outside crack In crack Upper crack Lower crack Padrow number (3x24=72) 5 GeV e- Beam Crack scan x 12/4/2012W.Wang_RD51 mini week5

Number of hits vs x (72 pad-rows) Study the hit reconstruction efficiency at or near the crack: take data with beam, moving by steps of 2mm Crack scan 12/4/2012W.Wang_RD51 mini week6

Gain study Using the fitted MPV of the (Landau) distribution of the measured charge Effective gain vs mesh voltage (compared with the direct gain measurements using 55 Fe source on a bulk detector without resistive foil) Effective gain vs drift distance (Vmesh=380V, Vdrift=140V/cm, peaking time 100 ns and 400 ns) 12/4/2012W.Wang_RD51 mini week7

Track fit 12/4/2012W.Wang_RD51 mini week8

(b): After alignment  = 2.9, 2.1 and 2.2 mrad  x = 47 µm, -43 µm and -52 µm Row Number: 3 x 24 = 72 Displacement in mm (a): Before alignment Residuals by padrow One module has 1726 pads (24 rows x72 columns) 12/4/2012W.Wang_RD51 mini week9

Test Bench The 55Fe source is put in an aluminum collimation tube and fixed on a set of two mechanical arms (X-Y). 12/4/2012W.Wang_RD51 mini week10

Test Bench Module S1D - ~30 disconnected pads Module S8G - ~30 disconnected pads 12/4/2012W.Wang_RD51 mini week11 Module S7H - ~5 disconnected pads + some at the boarder Module S4E - ~100 disconnected pads

12/4/2012W.Wang_RD51 mini week12 Evt with uncollimated source (each cluster is an X-ray photon)

Energy Resolution (preliminary) : ~15% rms Test Bench 12/4/2012W.Wang_RD51 mini week13

Successful test of 6 modules simultaneously with full integration of the electronics flat behind the panels. The analysis work is on-going. Test bench is on-going to study the modules one by one: energy resolution, calibration, cross-talk… Next step: 7 modules high quality test at the end of January /4/2012W.Wang_RD51 mini week14 Summary

Thank you! 12/4/2012W.Wang_RD51 mini week15