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Resolution from the 1mm pads of the Berkeley-Orsay-Saclay Micromegas TPC

Resolution from the 1mm pads of the Berkeley-Orsay-Saclay Micromegas TPC. KEK. TPC MEETING. D. Burke 5 , P. Colas 5 , I. Giomataris 5 , V. Lepeltier 4 , M. Ronan 1 , K. Sachs 2 , T. Zerguerras 3 1) LBNL Berkeley, 2) Carleton Univ., 3) IPN Orsay, 4) LAL Orsay, 5) DAPNIA Saclay.

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Resolution from the 1mm pads of the Berkeley-Orsay-Saclay Micromegas TPC

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  1. Resolution from the 1mm pads of the Berkeley-Orsay-Saclay Micromegas TPC KEK TPC MEETING D. Burke5, P. Colas5, I. Giomataris5, V. Lepeltier4, M. Ronan1, K. Sachs2, T. Zerguerras3 1) LBNL Berkeley, 2) Carleton Univ., 3) IPN Orsay, 4) LAL Orsay, 5) DAPNIA Saclay • Reminder: the Berkeley-Orsay-Saclay cosmic setup • resolution P. Colas - Resolution in BOS Micromegas TPC

  2. Cosmic-ray tracks (software from D. Karlen, adapted by M.Ronan) Rows 5 & 6 P. Colas - Resolution in BOS Micromegas TPC

  3. Track reconstruction Subtract pedestals, using the first 15 time buckets + 15 after the chamber end Max-likelihood fit the distribution of the number of electrons per pad with 4 parameters : (x0, f,1/R, s) s is the track width Readout anode pad plane 1024 pads 2x10 mm2 pads 1x10 mm2 pads P. Colas - Resolution in BOS Micromegas TPC

  4. Resolution Cross-check of the method: use only lines 1 and 2 and 9 and 10 to define f, extrapolate hit 5 into row 6 using this f, and make the distribution of the difference between extrapolation and position in row 6 divided by sqrt(2) Sigma of this distribution is the resolution. This gives the same result as using the track fitted using all rows except 5 and 6 P. Colas - Resolution in BOS Micromegas TPC

  5. Results on resolution P. Colas - Resolution in BOS Micromegas TPC

  6. Results on resolution P. Colas - Resolution in BOS Micromegas TPC

  7. Results on resolution P. Colas - Resolution in BOS Micromegas TPC

  8. Residuals vs track position in the pad Xpad-Xtrack Xtrack -> NO BIAS P. Colas - Resolution in BOS Micromegas TPC

  9. Results on resolution at 1T Note: extrapolated to 4T, we expect a resolution of 144 m at 2m with Ar isobutane and better than 120 m on average, wherever the charge sharing holds P. Colas - Resolution in BOS Micromegas TPC

  10. Conclusions Monte Carlo is now available for the diffusion and resolution studies. It shows a very good agreement with the data, except for ArCF4 This shows that: - Mis-calibrations, noise, and all kind of experimental problems (the simulation assumes a perfect detector) have no effect on the resolution. - CF4 behaves in a way different from expectation, though the drift velocity and track width are in very good agreement with MC -> one more piece in the CF4 puzzle P. Colas - Resolution in BOS Micromegas TPC

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