Electronics on the detector Mechanical constraints: Fixing the module on the PM base.

Transcription

1 PID meeting Mechanical implementation ti Electronics architecture SNATS upgrade proposal Christophe Beigbeder PID meeting 1

2 Electronics is split in two parts : - one directly mounted on the PM base receiving the PM signal and processing it with TDC/ADC - the other one concentrates and pack all the channels to send data to the DAQ Electronics on the detector Mechanical constraints: Fixing the module on the PM base. Dismounting issues. Thermal constraints : Door closed gives problems of cooling. Fans on the module as G Varner s? Global heat extraction. Christophe Beigbeder PID meeting 2

3 1 MAPMT footprint = > 64 channels Detector : 12 sectors -> ~ 36 k channels 5cm 1 Sector -> * 64 = 3072 Channels. 1 to 12 sectors per crate PGA TDC FE ASIC Concentrator Crate ADC 16 to 128-channel per board -> 20 to 160 boards per sector. Cat5 cable Power Supply From TTC optical To DAQ optical ECS electrical Christophe Beigbeder PID meeting 3

4 Other possible solutions Long boards : 128 channels. Mechanical issues for a precise adjustment base to base. This high granularity has a impact in case of failure. ( calculation? ) Christophe Beigbeder PID meeting 4

5 FE board synopsis 16 Channels from MaPmt 1 Raw Fast Amp Fe Asic 16 Channels Charge Amp Shaper Sample and Hold *16 (?) ADC ADC 12 bits/ 56 Mhz 12 bits/ Event Formater Actel PGA Event Packing Jtag Law Walk Discriminator TDC 16 Chs 100 ps PM output connectors I2C I2C FE_Pga I2C Probe Output MUX ECS Specs I2C Clock distibution elements Regulators/ Delatcher Power Supplies Version 1/03/2010 Christophe Beigbeder PID meeting 5

6 SNATS: Evolution & Perspectives Stake: high count rate detectors INL, DNL, resolution : same requirements. Increase the input data rate up to the Mhz level per chip. SNATS: 2.5MHz per channel but ~150 khz per chip Front End Gray counter bits 2*16 Registers Readout Read Request Need to reduce dead time due to readout protocol between ASIC and PGA = 50 ns per 16 bit word 16 Channels 16 output DLL 16 DLL 5 Hit 16 Christophe Beigbeder PID meeting 6

7 Keeping almost the same design and just adding a FIFO at the output. it increases the input channel rate in burst mode but keeps the average readout rate like the previous version. The FIFO size is costly. SNATS: Evolution & Perspectives 2 options (among many others ) Keeping the Gray counter inside the ASIC with an output bus width set by user in order to reduce the amount of data to be transferred. The Gray counter is duplicated inside the associated PGA. The serial output is synchronous to the clock to ensure the matching between the 2 counters. 16 differential output 80 Mhz (160MHz?). Max performance Max performance : 5 DLL bits + 4 Gray bits + start bit = 80 Mhz/channel in burst mode but limited Mhz = 8Mhz input rate! by the size of the FIFO. Linked to performance of the readout acquisition Front End Gray counter bits 2*16 Registers Readout Front End Gray counter bits Readout 4 to 16 Channels 16 output DLL Fifo Channels 16 output DLL 16 output 16 differential outputs Registers /Serialisers fifo empty 1 DLL 5 Fifo write sequencer DLL 5 1 Hit 16 Hit Christophe Beigbeder PID meeting 7

8 SNATS : new design Clk@160Mhz Gray counter bits SNATS2 *16 Reg Hit Synchro Clear DLL 5 Clear Reg Clear Derandomizer Fifo [1-4 words] *16 FE Packing Data[15:0]@80Mhz Instantaneous Dead time Per channel State Machine Global State machine Clk@80Mhz Sync Readout dead time Max speed 1Mhz Push the data Christophe Beigbeder PID meeting 8

9 Summary of the SNATS evolution : Redesign of the readout and a few improvements on the Front end part Programmable number of bits for the time counter. New derandomizing FIFOs : depth of 16/32 events ( each of 4 * 16-bit data word) Data push at the output Run end AMS.35 um technology. Chip delivered first quarter of 2011 We have to think of the way to run the chip together with the FE ASIC and to match the analog pulse converted by the ADC with the hit time -> Design and simulation in the FPGA Also have to interface the FPGA with the Proposal for the Electronics Trigger and DAQ architecture to get inside the front end buffer. The data are output with a latency depending on the rate per channel and the occupancy of the chip. 2 Clk cycles to output the data ( Derandomizer FIFO to 84 MHz (56*1 1.5) ) followed by 2 Clk cycles for each other fired Channel. Latency from 2 Clk cycles to 32 Clk cycles ( 2.5 MHz per channel ) Christophe Beigbeder PID meeting 9

10 Costing PID BARREL Front-end electronics FE-IC-1 prototypes + prod (qty ) FE-IC-2 prototypes + prod (qty ) FE boards (including FPGA) (qty ) Cables between FE and concentrator (qty 500) Concentrator electronics Concentrator boards (qty 50) Concentrator control boards (qty 6) Concentrator t crates (qty 6) Concentrator backplanes (qty 6) Concentrator prototyping LV supplies LV Power Supplies LV cables HV supplies HV Power Supplies HV cables Final installation Electronics test Bench Mars March 16th 17th Christophe Christophe Beigbeder Beigbeder PID ETD meeting Meeting 10 10