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
Gridpix TPC readout (Kees Ligtenberg)
Pads with GEMs or Micromegas for amplification → Detect charge spread Pixels readout with integrated aligned amplification grid (Gridpix) → detect each single electron Maximal possible information from track Track
e- e- e- e- e- e- e- e- e-
Ionisation in gas Amplification and detection at readout plane
e- e- e- e- e- e- e- e- e-
4/16 12-12-2017 (Nikhef Jamboree)
Performance of a Gridpix detector based on the Timepix3 chip
Schifferb, J. Timmermansa
aNikhef, Science Park 105, 1098 XG Amsterdam, The Netherlands bPhysikalisches Institut, University of Bonn, Nussallee 12, 53115 Bonn, Germany
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
electrons with high efficiency. The Timepix3 chip allowed for high sample rates and time walk corrections. Diffusion 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 µm. Using a truncated sum, an energy loss dE/dx resolution of 4.1% is found. Keywords: Micromegas, gaseous pixel detector, Micro-pattern gaseous detector, Timepix, Gridpix
p i x e l x
x i s ( b e a m d i r e c t i
) [ m m ] 2 4 6 8 10 12 14 p i x e l y
x i s [ m m ] 2 4 6 8 10 12 14 pixel z-axis (drift direction) [mm] 2 4 6 8 10 12 14 16 pixel z-axis (drift direction) [mm] 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6
s] µ ToT [Timepix hits Telescope track Diffusion in drift direction
/ ndf 2 χ 1084 / 45 z0 σ 0.000 ± 0.195 D 0.0001 ± 0.2528 z position [mm] 4 6 8 10 12 14 16 18 20 22 24 from fit to track-residual [mm] z σ 0.1 0.2 0.3 0.4 0.5 0.6 0.7 / ndf 2 χ 1084 / 45 z0 σ 0.000 ± 0.195 D 0.0001 ± 0.2528Fix grid position with value from y-fit z0 = 4.027 mm DL = 252 µm/√cm ( ∼ 230 µm/√cm calculated1) From laser test without time walk correction DL = 254 µm/√cm at Vgrid = 330 V and vdrift = 66.4 µm/ns 2
y-residual [mm] 0.2 − 0.15 − 0.1 − 0.05 − 0.05 0.1 0.15 0.2 2000 4000 6000 8000 10000 12000 14000 Entries 30570 Mean 0.0005512 − Std Dev 0.008335 Residuals insided selected area Residuals from all bins with >1000 entries z-residual [mm] 0.2 − 0.15 − 0.1 − 0.05 − 0.05 0.1 0.15 0.2 500 1000 1500 2000 2500 3000 3500 4000 Entries 30550 Mean 06 − 1.071e − Std Dev 0.0324 Residuals insided selected area Residuals from all bins with >1000 entriesRMS in selected area is 8 µm in plane and 31 µm (0.4 ns) in drift direction
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Telescope TPC
Gridpix TPC readout (Kees Ligtenberg)
Test Box Stump LV- regulation Flex Wirebond PCB Quad base plate Quad
13/16 12-12-2017 (Nikhef Jamboree)
+Bas van der Heijden, Charles Ietswaard, Auke Korporaal, Oscar van Petten, Joop Rövekamp
x [mm] 10 15 20 25 30 35 y [mm] 5 10 15 20 25 30 35 40 10 20 30 40 50 60
Hitmaps courtesy Kevin Heijhoff
x [mm] 5 10 15 20 25 y [mm] 5 10 15 20 25 30 35 5 10 15 20 25
Ionization in Laser focus
(spread due to (too) high intensity)
Laser beam hits grid
Hitmaps courtesy Kevin Heijhoff