1. Overview of the current TDR system Introduction Electronics for instrumentation TDR core : Metronome, ADC, Merge Data Handling Pete Jones, University of Jyväskylä SAGE / LISA Kick-Off Meeting Daresbury Laboratory, 2nd September 2005

2. TDR (Total Data Readout) Collects data from all detectors (over 500 channels and timestamps arrival to 10ns accuracy) and keeps it synchronised Timestamping ADCs : Measure energy + time of arrival of signal. All possible data is therefore collected

3. Electronics Each detector pre-amp output to electronics racks Amplifier : TFA / CFD combination – ADC Gate Amplifier : Shaping amp – ADC input –Logic signals to user electronics, TACS 4 free channels (x16) w/o JUROGAM AMPAMP CFDCFD ADCADC

4. Electronics Linear amplifer suffer decreased resolution for counting rates > 3kHz CFD/TFA gives good response at counting rates 0-100kHz Large number of high count rate spectroscopy channels  AMPAMP CFDCFD ADCADC AMP

5. TDR ADC VXI Card with 32 independent channels (analogue input + gate) 14 bit, 0-8V, 4.5us conversion time, sliding-scale : 16k spectra Flexible gating conditions can be programmed / Veto inputs Generates timestamp from gate and converts Output of data via SHARC link JUROGAM uses 2 cards -> 64 channels available T1T2 E Detect and measure ”pileup” by second pulse : two timestamps Fast Decays / Ge pileup - TDR

6. TDR Pattern Register VME Card with 32 independent channels Different operating modes for eg. Fast veto, grouped modes Flexible input signals Generates timestamp from inputs Output of data via SHARC link

7. TDR Metronome Heart of the TDR system Master 100MHz clock for ALL TDR components Generates SYNC pulses (every 655us) + fast starts whole system Battery backup of clock counter 8 outputs, currently 3 free 100 MhZ Distribution through cables SYNC Pulse Distribution

8. DATA COLLATE Data from each ADC card is time ordered, but COLLATE these together to produce time ordered data per SHARC & Over all sharcs ADC SHARCSHARC SHARCSHARC TIME ORDERED DATA

9. How TDR works : DATA MERGE  Data from all COLLATORS are MERGED together and time ordered. COLLATORCOLLATOR COLLATORCOLLATOR COLLATORCOLLATOR COLLATORCOLLATOR MERGEMERGE

10. Collate / Merge VME Based 3 processor system Merge CPU takes data from 2 collate CPUs, time orders, histograms Output via Gbit ethernet to Event Builder Processes up to 2Mevents/s, or 16MByte/s

11. Overview

12. Event Builder Once data are correlated by Event Builder, data selections can be processed in flexible way. Data can be output to several destinations Data Selection  Reduce raw singles data to useful coincidence data  GASSi  2us JUROGAM PU / BGO supression

13. Data Storage / Analysis Selected data (i.e. anything with GREAT) sent to DataStore –2TB Raid 1 array + redundancy – accessable from Gbit network Data also available by online & offline workstations User decides how to store data : Disc, Tape, etc.

14. Overview of the current TDR system ~400 channels of electronics Over 500 channels of analogue / digital inputs into TDR Stable metronome with master 100MHz clock VXI / VME based core of acquisition PC based Merge / Online / Offline systems Stable environment for electronics & acquisition Extremely stable for experiments, over 3 months continual running without fault