Tracker DAQ

1
Tracker DAQ

• Makoto Yoshida
• (Osaka Univ.)
• MICE meeting _at_ Frascati
• 2005/6/27

2
KEK beam test

• Test for the SciFi tracker with 1T solenoid
  magnetic field
• p/p/m test beam line in KEK-PS
• Slow extraction with 2-sec flat top in 4-sec
  cycle
• Typically, 1000 particles in a beam spill
• Newly developed Cryostat with Cryocooler
• 2 VLPC cassettes embedded
• Newly developed buffer module, VLSB
• 4 VLSB modules for 4 AFEII boards

3
DAQ Software for KEK beam test

• Will use Unix-based DAQ programs
• Unidaq developed by KEK
• http//www-online.kek.jp/online/Unidaq/
• A lot of experience at the KEK beam tests
• Work on Linux PC
• Network distributed system
• Transport data via NOVA buffer manager
• Processes can be distributed among PCs on the
  network.
• An Event Builder
• Collectors for TOF etc. and VLPC

4
System Overview
Linux PC
VLPC backplane
VME BUS
6U
AFE II (L)
8x64 ch
PCI-VME
VLPC Cassette 1
Slow Control
1553
1024 ch
AFE II (R)
8x64 ch
SASeq 1
AFE II Control
8x64 ch
AFE II (L)
SASeq 2
VLPC Cassette 2
VME ADC/TDC
1024 ch
AFE II (R)
8x64 ch
4
LVDS-VME 1
VLPC Cryostat
4
LVDS-VME 2
Serialized ADC DATA
4
LVDS-VME 3
4
PMTs
LVDS-VME 4
4x8bit 32 bit / board
5
Status

• Setup LinuxPC with Bit3 VME interface at Fermilab
  in Dec. 2005
• Start porting the Windows VB routines to C codes
  on Linux PC
• Successful readout pedestal data on a AFEII board
  in the end of May.
• Initialization AFE boards via 1553
• Control SASeq
• Readout buffer module, VLSB
• GUI is prepared for the test
• VME ADC and TDC modules have been tested in May
  KEK beam test to readout TOF, ACC and other beam
  counters in UniDAQ framework

6
Tracker DAQ at Fermilab
Backplane
AFEII
Cryocooler
Bit3
SASeq
1553
VLSB
7
VME ADC/TDC at KEK beam test
multi-event ADC (CAEN V792)
Multi-hit multi-event TDC (CAEN V1290)
UK colleagues provides VME ADC/TDC
8
To do for KEK beam test

• Extend slow-controller to handle 4 boards of
  AFEII
• Implement AFEII readout routines on UniDAQ
  framework
• Merge AFEII data with the other ADC/TDC data
• Integration test at Fermilab
• Time stamp of integration window on Trip chip
• Tracker prototype will be shipped from UK in July
• LED and Cosmic-ray data taking
• Setup the system in KEK in Aug.

9
KEK beam test triggering scheme

• Take coincidence of TOF counters
• Check the timing with charge integration window
  on Trip chip
• Trip has 48 x 132ns time slots
• Distribute trigger to CAMAC and VME modules

Trip integration window
VLPC analog
TOF coincidence
Event trigger
Dt relative timing of trigger to integration
window
10
Trigger (cntd)
21 usec
132 ns x 53 6996 ns
396 ns x 12 4752 ns
Live time 132 ns x 36 / 21 usec 23
SASeq
trig
trig
DG2020
AFE
Trig CLK
TOF Trig
sync
11
To do for MICE

• Event-buffering in VLSB
• Need to trigger 1MHz (1k muons in 1msec from
  ISIS)
• Implement zero suppression scheme
• Bench mark test of readout speed
• Establish event numbering scheme /
  synchronization to the other counters

12
Data Rate in KEK test

• Prototype has 2048ch readout channels
• Beam structure _at_ p2 beam line continuous 1000
  muons / 2 sec
• AFEII ? VLSB (VME LVDS SERDES Buffer)
• 2 Bytes / channel
• 20 bits _at_ 53MHz (multiplex 2 channel 10bits
  10bits)
• 64 x 1/53MHz 1 msec for a trigger
• VLSB ? VME bus ? PC
• Measured Transfer rate by KEK-online group with
  Bit3
• 23MB/s in DMA mode
• 2MB/s in PIO mode
• 4MB / 4-sec-spill
• Need to transfer 4kBytes in 1 msec w/o buffering
• In case of zero suppression by DISCR, data rate
  could be reduced to 1/10

13
Summary

• We are preparing stand-alone DAQ system for
  tracker
• VLPC readout
• VME ADC/TDC
• Not yet on slow-control
• To fit to MICE case
• Need event buffering (1k muons / 1msec)
• Need trigger / event numbering scheme