PMF STATUS ALFA - Electronics meeting 11th February 2008 P. Barrillon, S. Blin, C. Cheikali, D. Cuisy, M. Gaspard, D. Fournier, M. Heller, B. Lavigne, C. De la Taille, P. Puzo, J-L. Socha

ALFA Electronics - PMF status - Pierre B PMF reminder or active board or passive board First version (used during TB 2006) 11/02/2008 ALFA Electronics - PMF status - Pierre B

ALFA Electronics - PMF status - Pierre B Quick PMF status 9 PMF HV boards ok since mid of August 9 PMF Passive boards ok since mid of August 9 Kapton cables cabled and ready to be used since beginning of September 2 test boards ok since beginning of September 2 batches produced: 1 PMF ok out of 48 (sept 07)  MAROC2 bonded at CERN 11 PMFs ok out 16 (nov 07)  7 PMFs with MAROC2 bonded Debugging of test board firmware and software started in sept 2007 Real tests of them started with first PMF Long process since there are 2 FPGAs (PMF and test board) of different type programmed by 2 distant persons. Since 2008, communication with MAROC works and several important tests have been performed 11/02/2008 ALFA Electronics - PMF status - Pierre B

ALFA Electronics - PMF status - Pierre B Active board pictures MAROC2 chip bounded at CERN 64 ch PMT MAROC side Lattice side 11/02/2008 ALFA Electronics - PMF status - Pierre B

PMF tests - introduction November – December: tests performed by Bernard to check the global behavior of the PMF and his firmware, in collaboration with Wieslaw who took care of the Lattice firmware. In parallel debugging of the test software (Chafik). Since January 08: 2 test benches in parallel: One for firmware development used by Bernard One for qualitative tests (Mathieu, Sylvie, Pierre) « passive » board « active » board 60 points connector 100 points connector 11/02/2008 ALFA Electronics - PMF status - Pierre B

ALFA Electronics - PMF status - Pierre B Test board Ensure the configuration of the PMF/MAROC and the interpretation of the signals coming out the PMF. PC The communication with a PC is done thanks to a USB interface and the developed software. 11/02/2008 ALFA Electronics - PMF status - Pierre B

ALFA Electronics - PMF status - Pierre B Software developed (1) Configuration of 1 to 5 PMFs, read-back of all the registers, acquisition and graphic represen-tation of the hits of each board, recording of the corresponding data. 11/02/2008 ALFA Electronics - PMF status - Pierre B

ALFA Electronics - PMF status - Pierre B Software developed (2) From a library of sub-vis created by Chafik  development of dedicated tests: DAC linearity measurement Hits acquisition S-curves vs DAC (Qinj fixed) S-curves vs Vin (DAC fixed) others to be implemented Lots of measurements performed (s-curves, XT…) 11/02/2008 ALFA Electronics - PMF status - Pierre B

ALFA Electronics - PMF status - Pierre B Global tests with 5 PMFs 11/02/2008 ALFA Electronics - PMF status - Pierre B

Measurement of power consumption 5 PMFs connected to the Kapton cable Digital acquisition frequency: ~ 5 KHz 1 channel per 2 triggered (threshold set around noise level) There are 3 power voltages on the cable: 3.5 V for MAROC2 3.3 V : Lattice XP I/O 2.5 V : Lattice XP core Total current: 1.9 A ~ Same current / voltage whatever the number of PMFs: Total : ~ 650 mA / voltage 1 PMF : ~ 130 mA / voltage One PMF dissipation: Maroc 2 : ~ 0.45 - 0.47 mW Lattice XP : ~ 0.75 mW Total : ~1.2 W 11/02/2008 ALFA Electronics - PMF status - Pierre B

Kapton cable: Power Supplies distribution 3V5 Drops Maroc 2 Voltage 3V3 Lattice XP 2V5 3.606 V 3.374 V 2.535 V 50 mV 3.556 V 55 mV 3.319 V 63 mV 2.472 V 16 mV 3.540 V 19 mV 3.300 V 21 mV 2.451 V 13 mV 3.527 V ~40 mV 3.287 V ~46 mV 15 mV 2.436 V ~50 mV 8 mV 3.519 V 10 mV 3.277 V 2.426 V 4 mV 3.515 V 3.273 V 2.422 V PMF N° 4 Address 1 PMF N° 5 Address 2 PMF N° 8* Address 3 PMF N° 2 Address 4 PMF N° 7 Address 5 Test Board 11/02/2008 ALFA Electronics - PMF status - Pierre B

For better understanding… Passive board matrix PM channels MAROC2 channels 57 49 41 33 25 17 9 1 58 50 42 34 26 18 10 2 59 51 43 35 27 19 11 3 60 52 44 36 28 20 12 4 61 53 45 37 29 21 13 5 62 54 46 38 30 22 14 6 63 55 47 39 31 23 15 7 64 56 48 40 32 24 16 8 3 5 1 2 27 29 62 63 6 8 4 26 33 35 61 7 10 9 12 31 34 36 60 11 14 13 16 28 52 54 59 15 17 20 37 43 51 53 58 18 19 22 38 44 48 49 57 21 23 32 39 41 45 50 56 24 25 30 40 42 46 47 55 41 33 42 34 57 58 49 50 59 51 43 35 60 52 44 36 61 62 53 45 54 46 63 64 55 56 25 17 27 47 19 11 38 40 32 30 24 22 15 20 12 7 5 3 9 26 28 48 18 10 37 39 31 29 23 16 14 21 13 8 6 4 2 1 11/02/2008 ALFA Electronics - PMF status - Pierre B

First tests and measurements Passive board is used both to inject signal (through a capacitor) and protect MAROC2 bounding Most of the test points and vias are accessible on the MAROC side of the active board  need a careful handling DAC linearity looks ok (linearity < ± 1 %) The FSU and FSB pedestals look homogeneous and stable (dispersion = 1 ‰). Mean values smaller than for MAROC2 individual tests. FSU: 0.89 vs 0.96 V FSB: 1.90 vs 2.07 V 11/02/2008 ALFA Electronics - PMF status - Pierre B

ALFA Electronics - PMF status - Pierre B DAC Linearity Y = a.x + b a = 0.380 ± 0.001 mV b = 0.705 ± 0.001 V a = 0.378 ± 0.001 mV b = 0.689 ± 0.001 V Linearity < ± 1% It takes time to the DAC to stabilize. VDAC decreases by 30mV before stabilizing (warming up ?). 11/02/2008 ALFA Electronics - PMF status - Pierre B

ALFA Electronics - PMF status - Pierre B Digital answer (hits) Many tunings and improvements were made since the beginning so that a hit is properly measured Now the configuration looks suitable and dedicated measurements were performed For a fixed signal (~ 100 fC i.e. 2/3 of photo-electron) we looked for the threshold for which we had 50 % trigger efficiency for all 64 channels Nice homogeneity if we except this ch 11/02/2008 ALFA Electronics - PMF status - Pierre B

S-curves vs injected charge - 1 From previous measurement the DAC was fixed (1800) and a scan of the injected signal was carried out for all channels. The signal was sent to a single channel at the same time and all channels were set a gain 1 (g16). Board #3 11/02/2008 ALFA Electronics - PMF status - Pierre B

S-curves vs injected charge - 2 Board #2 11/02/2008 ALFA Electronics - PMF status - Pierre B

ALFA Electronics - PMF status - Pierre B Cross-talk - 1 Signal is injected in a large range (0 to 15 p.e) on a single channel. The data from the first channel to trigger is used to estimate the cross-talk. DAC = 1800  The channel which triggers firstly is not always a direct PM or MAROC neighbor 11/02/2008 ALFA Electronics - PMF status - Pierre B

ALFA Electronics - PMF status - Pierre B Cross-talk - 2 Typical cross-talk measurement. It always appears on channels neighbor in the black connectors. Example of a typical cross-talk measurement. MAROC2 channels Black connectors ch28 ch30-31 ch26 PM (or PMF) channels Central channel: 28 for PMF (28 for MAROC2) First channel to trigger: 27 (31) Second channels to trigger: 26 and 48 (26 & 30) 11/02/2008 ALFA Electronics - PMF status - Pierre B

ALFA Electronics - PMF status - Pierre B Cross-talk - 3 The level of cross-talk is similar to the one measured on MAROC2 as well as the charge at which it appears. 11/02/2008 ALFA Electronics - PMF status - Pierre B

ALFA Electronics - PMF status - Pierre B Prototypes status 8 x PMFs produced : First PMF, communication interface tested at Orsay in October 2007 after production, MAROC2 bonded at CERN in November 2007. Many tests performed  debugging and improvement of the MAROC2 configuration and the digital acquisition facilities… but also a lot of manipulations  bonding damaged a little (repairable) – Status KO for the moment Used beginning of January for the digital acquisition and MAROC2 configuration tests. Since February it is tested intensively – Status OK Intensive tests since the end of January – Status OK Functional tests end of January – Status OK Damaged at Orsay, sent to MATRA for bonding protection project / tests Functional tests end of January – Status: address msb forced 1  can only be used at the positions 4 or 5 of the cable otherwise OK Functional tests end of January – Status: DAC0 forced at ~ 870 mV  PMF not usable… to be debugged (Status KO for the moment) 11/02/2008 ALFA Electronics - PMF status - Pierre B

ALFA Electronics - PMF status - Pierre B Conclusions We can communicate meaningfully with the PMF DAC linearity is fine Fast shaper pedestals look small but ok Trigger output behavior looks fine The hard work of the end of 2007 is paid back !  PMF(s) works fine in association with the kapton cable Tests will continue on the trigger output (hits) aspect then on the charge measurement one (to be implemented in the firmware). Future foreseen: “New design”: 1 PMF/panel instead of 8 for better rigidity. A location for a resistor and a capacitor added. Production files given to ELVIA this week  production of 32 PMFs by the end of March 2 weeks for the cabling by MATRA  ready for MAROC bonding before end of April Production of 32 HV and passive boards 11/02/2008 ALFA Electronics - PMF status - Pierre B