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M2R2 and M2R3 chambers modification

M2R2 and M2R3 chambers modification. Proposal Revision 2. N.Bondar, O.Maev CERN. 20.05.2013. M2R2 chamber. Proposed chamber. Existing chamber. Overall dimension 750mm x 400mm. Overall dimension 750mm x 370mm. LV reg. (2chips). LV reg. (2chips). Anode FEB 2 x 48. Foot.

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M2R2 and M2R3 chambers modification

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  1. M2R2 and M2R3 chambers modification Proposal Revision 2 N.Bondar, O.Maev CERN. 20.05.2013

  2. M2R2 chamber Proposed chamber Existing chamber Overall dimension 750mm x 400mm Overall dimension 750mm x 370mm LV reg. (2chips) LV reg. (2chips) AnodeFEB2 x 48 Foot CathodeFEB 2 x 96 Foot Active area 612mm x252mm CathodeFEB 2 x 32 CathodeFEB2 x 32 Active area 612mm x252mm 2 LV reg. (2chips) 2 LV reg. (2chips) Foot Foot Option 4 more FEBs Foot CathodeFEB 2 x 96 Foot Cathode physical pad 76.5mm x 31.5mm =2410 mm2 Maximum expected rate - 3.2 MHz Number of pads 8 x 8 = 64 Anode physical pad 12.75 mm x 252mm = 3213mm2 Maximum expected rate - 4.6 MHz Inefficiency ~ 21% ( in hottest place) Number of physical pads 48 Logical pad size 12.75mm x 63mm Number of logical pads 48 x 4 = 192 On chamber : Anode FEB – 6 Cathode FEB – 8 LV regulator – 2 Control line – 3 Signal cables – 14 Power cable – 4 Power voltage - 3V Power current - 7A Power consumption – 21W Cathode physical pad size 12.75mm x 63mm =803 mm2 Maximum expected rate - 1.1 MHz Number of pads 48 x 4 = 192 Inefficiency ~ 1.5% ( in hottest place) Logical pad size 12.75mm x 63mm Number of logical pads 48 x 4 = 192 On chamber : Cathode FEB – 24 LV regulator – 4 Control line – 4 Signal cables – 24 Power cable – 8 Power voltage - 3V Power current - 12A Power consumption – 36W

  3. CLUCTER AREA 50mm 2mm CLUCTER AREA Pad readout Wire readout Angle for “normal” particles 2/50 = 0.04 Cluster area - 4mm for wire readout - 8 mm for pad readout Charge induced to the original pad Charge induced to the adjacent pad Prepared by N.Bondar

  4. Cathode pad rate estimations Wire group Connected to one FEB Very rough Hottest FEB in average Cathode pads connect to one FEB To estimate average rate per logical pad at the hottest area in chamber are used 6 wire groups and column of 8 cathode pads (pink area). Chamber 2A17A3 2A16A3 2C17A3 2C16A3 2A19A1 2C19A1 wire count - 2272 2138 2210 2124 1371 1322 pad count - 1933 1707 1804 1584 1555 1686 Ratio W/P - 1.17 1.25 1.23 1.34 0.88 0.78 Single pad(W) 95 89 92 88 Average count per pad including 40% of clusters - 900 kHz (Assuming factor 10 for particle rate) Wire group has more counts in horizontal direction and less in vertical direction. Hot Cathode FEB: 2233 2178 Hot Anode FEB : 3624 3353 Prepared by N.Bondar

  5. Analog idea for saving pad size. (Should be tested during RND) N+1 N+2 N+3 IN2 IN3 IN1 Input charge distribution A A A Comp Comp D Comp Comp D D AND OUT1= 0 OUT3 OUT1 AND OUT2 AND OUT3= 0 OUT2=(IN2>IN1) & (IN2>IN3) =1 Prepared by N.Bondar

  6. Digital idea for using cluster to improve space resolution (Should be tested during RND) N+3 N+1 N+2 Cluster zone Cluster zone Cluster zone Cluster zone IN2 IN3 IN1 Input charge distribution A/D A/D A/D OU2 OU1 AND AND AND OU1 OU2 OUT N1 CL OUT OUT N2 0 0 0 0 0 0 1 0 0 1 1 0 1 0 0 1 0 0 1 OUT N2 OUT N1 CL OUT Prepared by N.Bondar

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