1. 14-oct-2014 GEM detector configuration 1 12 stations: Z = 30 – 45 – 60 – 80 – 100 – 130 – 160 – 190 – 230 – 270 – 315 – 360 Stereo angles: 0 – 7.5 deg in stat. 1-4; 0 – 15 deg in stat. 5 - 12 Pitch: 400 um in stat. 1-4, 800 um in stat. 5-12 Stations 1 - 4 A.Zinchenko

2. GEM plane X size, cmY size, cm dx / dy, см hot zone Z coord -Z target 1-260 3 / 7 / 12 / 1830, 45 3-480 4 / 9 / 15 / 2560, 80 5 130 (2x66) slides 3-4 80 (2x41)15 / 10 100 (prototype) 6-8 163 (slide 6) 80 (2x45)40 / 15130,160,190 9-12 200 (structure like in slide 6) 80 (2x45)50 / 20230,270, 315,360 R(beam pipe)= 2.5 cm (1 plane), 5 cm (12 plane), linear rise, δ=1 mm, carbon dz1(frame) = 1.5cm (G10), dz2 (sensitive volume)=1cm (~0.7% X 0 ), dx1,dy1 (inner frame) = 1.7cm (G10), dx2(outer frame) = 5cm (G10), dy2 (outer frame) = 3.75 cm (G10), dz3 = 2.5 cm (G10), spacers: net 10x10 cm, width / thickness 2x6 mm fiber glass, eff→0 Strip pitch (1-4 planes) = 0.4 mm, strip pitch (5-8 planes) = 0.8 mm, strip pitch (9-12) = 1.0 mm

3. x z x y xsize dx1dx2 dy2 dy1 R dz1 dz2 dz3 Structure of GEM plane 5 (4 x 66 x 41 cm, prototype) ysize

4. dx dy spacers X‘ coordinate (odd plane 5): 1 quarter: +75 degree 2 quarter: +105 degree 3 quarter: -105 degree 4 quarter: -75 degree X‘ coordinate (even planes, not realized): 1 quarter: +105 degree 2 quarter: +75 degree 3 quarter: -75 degree 4 quarter: -105 degree X coordinate (odd and even planes): +90 degree 12 43 Structure of strips in GEM plane 5 (4 x 66 x 41 cm prototype)

5. Structure and length of strips in stations 1-2, 3-4 X‘ coordinate (odd planes 1,3): +82.5 degree (-7.5 degree from vertical) X‘ coordinate (even planes 2,4): +97.5 degree (+7.5 degree from vertical) X coordinate (odd and even planes): +90 degree (vertical)

6. Boundary of the Left and Right R/O boards Geometry of the JINR GEM 1632x450 chamber 5 Installation holes (Ø~5mm) R/O board width: 35mm (max) 400 779.9 (inner zone) Place for HV divider R40 0 0 strips +15 0 strips 150 450 420.1 1632 HV R/O connectors Left R/O board Right R/O board Number of stripsLeft R/O board Right R/O board X(0 0 ) strips Outer zone1020 Inner zone525500 X(15 0 ) strips Outer zone1131 Inner zone507531 Total strips:31833182 R/O Connect. (128 pins):25

7. X‘ coordinate (upper detectors: odd planes 7,9,11; lower detectors: even planes 6,8,10,12): +105 degree (+15 degree from vertical) X‘ coordinate (upped detectors: even planes 6,8,10,12; lower detectors: odd planes 7,9,11): +75 degree (-15 degree from vertical) X coordinate (odd and even planes 6-12): +90 degree (vertical) Strip angles in stations 6-12

8. Specification of the Triple GEMs based detector prototype for BM@N (Baryonic Matter at Nuclotron) experiment at JINR Dubna 1.Triple GEM with x,y readout from strips on anode pcb. 2.Active area 1632x450 mm 2. 3.X-strips(0 0 ) parameters: pitch: 800 µm, width: 160 µm, length: 150 mm, 300 mm, 450 mm. 1.Y-strips(+15 0 ): pitch: 800 µm, width: 680 µm, length: 155 mm,311 mm, 466 mm. 1.Drift gap: 3mm, gem1-gem2 gap: 2.5 mm, gem2-gem3 gap: 2mm, induction gap: 1.5 mm. 2.Output 128 pins connector: CLE-170-0-DV 3.Support frame: width </= 15 mm, height </= 10 mm. 4.Place for gas, HV and output connectors possible on the left, right and upper ages only.

9. X Z beam target GEM 66x41 cm, 5 planes GEM 163x45 cm, 2-4 planes Y X Beam position 1st configuration (minimal, winter 2016/17 ) Z beam X 1 Si plane X/X’(0/2.5 degree), 25 x 25 cm 2nd configuration (winter 2016/17) Detector positions could be optimized beam / target C12+C12 (Cu or Pb), 4.0 GeV/nucleon 1 Si optional

10. GEM 66x41 cm, 5 planes GEM 163x45 cm, 6 planes Y X Beam position Z beam X 2 Si planes X/X’(0/2.5 degree), 25 x 25 cm 3rd configuration (maximal, summer 2017) Detector positions could be optimized beam / target Argon, Krypton+ (Cu or Pb), 4.0 GeV/nucleon