Readout technologies for ILD TPC Track -E drift Pads with GEMs or - PowerPoint PPT Presentation

Readout technologies for ILD TPC Track -E drift Pads with GEMs or Micromegas for e - e - amplification → Detect charge spread e - e - Ionisation in e - e - e - e - e - e - gas e - e - e - e - e - e - e - e - Amplification and detection at readout plane Pixels readout with integrated aligned amplification grid (Gridpix) → detect each single electron Maximal possible information from track 12-12-2017 (Nikhef Jamboree) Gridpix TPC readout (Kees Ligtenberg) 4/16

Performance of a Gridpix detector based on the Timepix3 chip Timepix hits Telescope track pixel z-axis (drift direction) [mm] 16 C. Ligtenberg a, ∗ , K. Heijho ff a,b , Y. Bilevych b , K. Desch b , H. van der Graaf a , F. Hartjes a , P.M. Kluit a , G. Raven a , T. 1.6 14 pixel z-axis (drift direction) [mm] 12 1.4 Schi ff er b , J. Timmermans a 10 1.2 8 6 1 s] a Nikhef, Science Park 105, 1098 XG Amsterdam, The Netherlands 4 µ ToT [ 0.8 2 b Physikalisches Institut, University of Bonn, Nussallee 12, 53115 Bonn, Germany 0.6 0 2 0.4 4 6 p i x 8 0.2 e l y 0 10 - a 2 x 4 i s 12 6 8 [ 0 m 10 m ] 14 12 m m n ) [ i o e c t 14 d i r ] m e a b s ( a x i x - e l p i x Abstract A Gridpix readout for a TPC based on the Timepix3 chip is developed for future applications at a linear collider. The Gridpix detector consists of a gaseous drift volume read-out by a single Timepix3 chip with an integrated amplification grid. Its performance is studied in a test beam with 2.5 GeV electrons. The Gridpix detector detects single ionization electrons with high e ffi ciency. The Timepix3 chip allowed for high sample rates and time walk corrections. Di ff usion is found to be the dominating error in the pixel plane and in the drift direction, and systematic distortions in the pixel plane are below 10 µ m. Using a truncated sum, an energy loss dE/dx resolution of 4.1% is found. Micromegas, gaseous pixel detector, Micro-pattern gaseous detector, Timepix, Gridpix Keywords: ~ Di ff usion in drift direction Entries 30570 Entries 30550 14000 Residuals insided selected area Mean − 0.0005512 Residuals insided selected area Mean 1.071e 06 − − 4000 0.7 from fit to track-residual [mm] Residuals from all bins with >1000 entries Residuals from all bins with >1000 entries Std Dev 0.008335 12000 Std Dev 0.0324 3500 0.6 10000 0.5 3000 0.4 2500 8000 z 0.3 σ 2000 6000 0.2 2 2 χ χ / ndf / ndf 1084 / 45 1084 / 45 1500 σ σ 0.195 0.195 0.000 0.000 ± ± 0.1 z0 z0 4000 D D 0.2528 0.2528 ± ± 0.0001 0.0001 1000 0 4 6 8 10 12 14 16 18 20 22 24 2000 z position [mm] 500 Fix grid position with value from y -fit z 0 = 4 . 027 mm Telescope TPC 0 0 D L = 252 µ m / √ cm ( ∼ 230 µ m / √ cm calculated 1 ) 0.2 0.15 0.1 0.05 0 0.05 0.1 0.15 0.2 − − − − − 0.2 − 0.15 − 0.1 − 0.05 0 0.05 0.1 0.15 0.2 y-residual [mm] z-residual [mm] From laser test without time walk correction D L = 254 µ m / √ cm at RMS in selected area is 8 µ m in plane and 31 µ m (0 . 4 ns) in drift direction V grid = 330 V and v drift = 66 . 4 µ m / ns 2

Quad development • 4 GridPix chips on one mechanical support (40×28 mm 2 ) • All services under large active surface (68.9% coverage) • First electrical Quads assembled and functional Wirebond PCB regulation Stump LV- Flex Quad Test Box Quad base plate +Bas van der Heijden, Charles Ietswaard, Auke Korporaal, Oscar van Petten, Joop Rövekamp 12-12-2017 (Nikhef Jamboree) Gridpix TPC readout (Kees Ligtenberg) 13/16

40 y [mm] 60 First Hit map with 35 50 Sr 90 source 30 40 25 • First ‘electrical' quad uses class B-D chips 30 20 • New batch of gridpix chips 15 (with slightly adapted design) 20 being prepared at IZM 10 • Next step: build 10+5 quads 10 (5 ordered by Bonn) 5 & equip a base plate 0 10 15 20 25 30 35 x [mm] Hitmaps courtesy Kevin Heijhoff

y [mm] 25 First Hit map with 35 Laser 30 20 25 • First ‘electrical' quad uses 15 20 class B-D chips • New batch of gridpix chips 15 10 (with slightly adapted design) Ionization in Laser beam hits grid being prepared at IZM Laser focus 10 (spread due to (too) high intensity) • Next step: build 10+5 quads 5 (5 ordered by Bonn) 5 & equip a base plate 0 0 0 5 10 15 20 25 Hitmaps courtesy Kevin Heijhoff x [mm]