Electronics Status

1
Electronics Status

• Trigger and DAQ run successfully in RUN2006 for
  the first time
• Trigger communication to DRS boards via trigger
  bus
• Trigger firmware and DRS firmware was modified
  during beam time and downloaded
• Both DRS and trigger waveforms were read out by
  front-end computers (drivers and readout routines
  were successfully implemented)
• DRS and DAQ system
• 4 front-end computers, 1 back-end computer, MIDAS
  software
• 60 channels TC, 9 channels NaI, 864 channels DC
• 600 GB in the last few days of RUN2006
• MSCB Slow control system was successfully
  operated during beam time including MSCB high
  voltage system

2
Trigger
3
Trigger System Structure
4
ARGUS monitor (scalers)
Rate of individual channels (independent of
trigger)
5
Trigger scheme for TC
AL (mV)
AR (mV)
excluded
excluded
AL gt 50 mV AR gt 50 mV
ALAR gt 200 mV
excluded
? trigger selection independent of z
? 50 mV threshold 100?150 mV at PMT output
6
Trigger Waveforms

Trigger window

7
Efficiency study
low intensity (slit 10)
high intensity (slit 100)
ms
ms
events associated with the trigger signal
unbiased events (out of trigger window and with
10 mV threshold)
8
Efficiency profile (all PMTs)
Secondary particles
Unbiased (10mV)
Trigger (50mV 200mV)
rescaled by Rpulse??T
Landau peak for e
? NT/NU
Interpolation by erf function
Npe
? almost full efficiency at Landau peak (6MeV,
500pe)
9
Trigger Conclusions

• Trigger system was completed and installed last
• summer (both Hardware and Firmware)
• Successfully linked to DRS DAQ online
• Monitor tools developed
• Properly worked during December run
• TC event selection
• WFD for PMTs
• Proved to be 100 efficient for energy losses in
  the Landau peak
• Very low noise (RMS0.4 mV)

10
DAQ System
11
DAQ Cluster
12
Offline Cluster

• 5 x 4 CPUs SunFire X4100
• 30 TB disk storage
• Planned in 07 64 CPU 100 TB disk

lcmeg05
lcmeg04
lcmeg03
lcmeg02
lcmeg01
13
Correlation DRS vs. Trigger waveform

• Signal height of DRS waveform (101) Trigger
  waveform (2.51)

14
Crosstalk removal

Reduction of (coherent) noise band cross talk by
averaging empty channels and subtracting signal
channels Noise level 0.5 mV ? 0.32
mV Baseline fluctuation (100 ns) 0.27 mV ?
0.07 mV
15
Overall Data Rate

• Now had 2.8 MB events (50 DC TC, no LXe) and
  could run at 10 Hz
• Full detector estimates 9 MB/event, 5 Hz, 650
  TB/year
• Zero suppression (50 on LXe, 80 on DC)
• ADC/TDC values for non-signal-like events
• Partial waveform readout (reduced window size)
• 3rd level trigger in online cluster
• Applying all this techniques
• 100 Hz ADC rate
• 6 Hz Waveform rate

100Hz
30 TB/year
DRS firmware
16
DRS3 status

• All channels are currently equipped with DRS2,
  ran reasonably well during beam time
• DRS2 shows temperature dependence which should be
  fixed with DRS3 chip (improved amplitude
  accuracy)
• 50 Prototypes DRS3 have been delivered
• Test board PCB is in production
• Test chip until March 07
• Mass production in summer 07 if tests ok
• Replace DRS2 by DRS3in 2007/08 shutdown

17
Slow Control
18
MSCB slow control overview
Cluster
Switch

• 8 Ethernet Submasters
• 4 SCS-2000 units each with up to 64 I/O
• HV system with 1054 channels

19
BTS slow control
20
Long term BTS levels
21
HV system

• 900 channels for LXe calorimeter
• Designed and built at PSI
• 24-bit ADCs for high accuracy (20mV)
• Once micro controller per five channels
• Read out every 4 seconds
• 60 channels TC 64 channels APD
• Run stably in last beam time
• Redesign of MSCB protocol resultedin increased
  readout speed (4 sec. forall channels, 0.5 sec.
  for last modified)

22
Future Plan

• Fine-tune trigger firmware as detectors come
  online
• Increase DAQ speed to 100 Hz until next beam time
• Data reduction (Tokyo Workshop end of March 07)
• 3rd level trigger
• Improve front-end code and DRS firmware
• Replace DRS2 by DRS3
• If tests of DRS3 are successful, replace towards
  end 07
• If DRS3 is not working, redesign required (0.5
  y)
• Finances
• All electronics bought
• Spare PSI funds for DRS3 allocated
• Funding of extension of offline cluster secured
  (PSI part)