VeLo Analog Line Status LHCb week February 2004 A. Bay, J. Borel, L. Locatelli, R. Frei long line tests with beetle 1.3 the repeater board & cabling

Tests with Beetle 1.3 pre-compensation A B 3 pF 22k 60 m CAT6 Beetle 50 repeater oscilloscope > 1 GHz post-compensation C clock ADC RB3 motherboard 8 bit analog-board

Pre/post compensations B1.3 A B C ADC pre post

Beetle 1.3 Q injected 4 links mode 26 unbonded Header 6 bonded

A few FFTs pre-compensation only 60 m cable 100 MHz "Common Noise"

Some other FFTs A B C A, B on C off A,B off C on pre-compensation only ADC A, B on C off A,B off C on pre-compensation only post-compensation only

22k 50 3 pF Calibration 1 MIP is 200 micrometers Si <de/dx> (not the "most probable") i.e. 22kelectrons To convert to most-probable: multiply by ~0.7 Example: calibration with RB3

Studies with oscilloscope 1) records ~300 events (sequences with samples ~0.1 ns resolution) with and without charge injection 2) pedestal calculation 3) get an average pulse shape, choice of "sampling time" 4) analysis: sample at sample points (0.5 ns width) pedestal subtraction, common noise correction,... 25 ns channels 0 1 2 sample here ... and here ... and here

S/N & Residual vs phase scan residual = A(t+25ns)/A(t) 40 S/N 30 20 residual % 10 -10 -8 -4 0 4 8 ns scan ±8 ns

Oscilloscope .2 Calibration 0 1 MIP noise from unbonded channels CN rms=0.05 rms=0.03 CN correction No CN correction

Tests with RB3 A B C A=C= off B=470 pF A=on C=off B=120 pF B1.3 ADC S/N = 31.2 Residual < 1 % A=on C=off B=120 pF S/N = 32.7 Residual ~ 6 %

Tests with RB3 .2 "CN" from pipeline non-homogeneities ? without CN subtraction RMS=1.927 ADC RB3 firmware modified to register the pipeline column number... with RMS=1.055 ADC intrinsic system noise (resistor instead of Beetle)

FIR studies Ai undercompensated signal Bi Bi= 1.92Ai - 0.38Ai-1 - 0.06Ai-2

FIR studies .2 001100 001010

FIR studies .3 001101 001110

Test beam configuration #1 pre-compensation A B repeater 60 m CAT6 sensor Beetle 1.3 ADC AD9203 10 bits AD813x VME NA60 DAQ resid. < 5% S/N>20 RB3

Test beam configuration #2 pre-compensation A B repeater 60 m CAT6 sensor Beetle 1.3 ADC AD9203 10 bits AD813x VME NA60 DAQ push gain and/or reduce load resistor value from 50  ~10 ohm

Repeater Board & Cabling

Repeater Board V2 OR Logic card (who is responsible ?) LV card :Vreg HV connector : .?. Service connector: ntcA,ntcB,…? 8x driver board ver2 LV card :Vreg (can be bypassed ?) Logic card (who is responsible ?) LV connector 4x HD Dsub 44pins OR 16 RJ45 Front panel

Analogue link partitioning V2.1 HD Dsub 44pins 4 bundles 88 boards (5/crate max) 4 CAT6 / bundle 4 bundles/board 4x88=352 bundles V2.2 16 RJ45 4 bundles

Power supply for Repeater Board Approximate Voltage before regulators 1 repeater board Cable: 24 twisted pairs + shield Drivers 8 boards (x8channels) +7, -7 V (1A) 6 pairs in // plus 2 pairs sense-line +4.5 V (6A) 1 Hybrid 16 Beetles 12 pairs + 1 sense ~15 [W] dissip. in the cable Logic TTCrx,... 2 pairs + 1 sense +7 V (1A) 5/crate max 24 crates (not all full equipped)

Crate for Repeater Boards 130 [W] dissipation/crate No extra cooling system needed 20 RepBoards 6x4x4 crates 1 RepBoard 1 RepBoard VETO partitioning to be reviewed

Layout Low voltage configuration : Caen ? Wiener ? NF48P cable 70m LV cable bundle 4m NF48P cable 70m Connection pannel RPT board version 2 Dsub LV connector fem Connection pannel