Reminder Comparison single chip & ASU chip Chip to chip variations Outlook Calibration des Microroc (II) Alex, Cyril, Giom, Jean, Max 09 Mai 2011, Annecy 1 Reminder 2 Comparison single chip & ASU chip 3 Chip to chip variations 4 Outlook 1 / 7
Reminder Comparison single chip & ASU chip Chip to chip variations Outlook Previous results (I) Experimental conditions Test charge: 2.5, 12.5, 25, 37.5 fC Pedestal offset at 7 Send charge to group of 8 channels Pedestal offset Reduction of pedestal RMS by factor 2 Preamplifier gain (4 chips) ∼ 7 DAC/fC with 1 % RMS variations (Small) channel to channel variations Noise of about 0.12 fC 2 / 7
Reminder Comparison single chip & ASU chip Chip to chip variations Outlook Previous results (II) Preamp gain Microroc 8 ASU 14 hgain_8 hgain_8 Scurves - chip 8 ASU 14 - Tuned offset Gain VS channel chip 8-20-32-45 ASU 14 Entries Entries 64 64 efficiency (%) gain norm. avg. Mean Mean 6.989 6.989 30 100 1.04 RMS 0.06986 RMS 0.06986 25 80 1.02 20 60 1 15 40 10 0.98 20 5 0.96 0 0 180 185 190 195 6 6.5 7 7.5 8 0 10 20 30 40 50 60 threshold (DAC unit) gain (DAC/fC) channel Conditions for next tests Test charge: 2.5, 12.5, 22.5, 32.5 fC Pedestal offset at 7 Send charge to single channels 3 / 7
Reminder Comparison single chip & ASU chip Chip to chip variations Outlook Comparison single chip & ASU chip Production test Recent ASU test Flat pattern Periodic pattern Wrong gain channel 8 Variations modulo 8 Higher gain channel 62 & 63 Higher gain channel 63 Norm. gain VS channel all chips ASU 15 - production Norm. gain VS channel all chips ASU 15 - calibration 1.05 1.05 gain norm. avg. gain norm. avg. 1.04 1.04 1.03 1.03 1.02 1.02 1.01 1.01 1 1 0.99 0.99 0.98 0.98 0.97 0.97 0.96 0.96 0.95 0.95 0 10 20 30 40 50 60 0 10 20 30 40 50 60 channel channel 4 / 7
Reminder Comparison single chip & ASU chip Chip to chip variations Outlook Channel to channel variations Mean gain versus channel number Periodic pattern observed for all fully tested ASUs (14, 15) Reflect lenght variation of PCB pad to pin lines Channels 62 and mostly 63 are clearly far from average Norm. gain VS channel all chips ASU 15 - calibration gain norm. avg. 1.04 1.03 1.02 1.01 1 0.99 0 10 20 30 40 50 60 channel 5 / 7
Reminder Comparison single chip & ASU chip Chip to chip variations Outlook Chip to chip variations Position on ASU Ratio ASU chip/single chip Gain drops along rows Normalise measured gain 10 % var. between row 1–6 to production gains Seen for ASU 14 & 15 so far → attenuation of test Q Preamplifier gain - ASU 15 Preamplifier gain ratio PROD/CALIB - ASU 15 gain (DAC/fC) 7.6 gain ratio 1.04 7.4 1.02 7.2 1 0.98 7 0.96 6.8 0.94 6.6 45 50 55 60 65 70 75 80 85 90 45 50 55 60 65 70 75 80 85 90 chip number chip number 6 / 7
Reminder Comparison single chip & ASU chip Chip to chip variations Outlook Outlook MICROROCs show great performance: Low noise (0.12 fC) and gain variations of 1 % RMS Channel to channel and chip to chip variations understood as PCB lines variations and attenuation of test signal from interDIF to chips Offset map available for all ASUs Next steps: Complete gain map of all ASU (all data reconstructed) Calibration with Bulk mesh Send jobs on MUST 7 / 7
Recommend
More recommend
