1. Jean-Sebastien Graulich, Geneva
DAQ fo KL and TOF
Jean-Sebastien Graulich, Geneva
General Information
Status of Synchronization problem
FEE for TOF2
MICE CM25 Nov 2009
Jean-Sebastien Graulich

2. Jean-Sebastien Graulich
Reminder
TOF Front End
KL Front End
MICE CM25 Nov 2009
Jean-Sebastien Graulich

3. Jean-Sebastien Graulich
Issues (1)
Cross Talk
Possible sources
Splitter
RC Shaper
Twisted pair cable
Affecting both TOF and KL
Cabling done in such a way that Requiring coincidence between opposite PMTs reduce the effect strongly but not completely
Needs some dedicated studies
Action: A better splitter is under production in Geneva
MICE CM25 Nov 2009
Jean-Sebastien Graulich

4. Jean-Sebastien Graulich
Cross Talk
Consequence:
Dead Channel unnoticed ! (rate != 0)
Counts
- S6 in TOF 1 (ch 73)
- Disconnected in the hall
- Probably for the entire September run
TDC01 Channel Number
Counts
MICE CM25 Nov 2009
Jean-Sebastien Graulich
TDC00 Channel Number

5. Jean-Sebastien Graulich
Issues (2)
Discriminator dead time
Minimum width of logic signal after discriminator:
100 ns
Double pulse resolution: 110 ns
In a given TOF PMT, it is IMPOSSIBLE to see two hits in the same burst !
Complying with specifications but a real limitation
MICE CM25 Nov 2009
Jean-Sebastien Graulich

6. Jean-Sebastien Graulich
Issues (3)
Noise in FADC
Fluctuating baseline
Seems to be time correlated with the particle trigger
Affects Charge resolution
Needs dedicated studies
MICE CM25 Nov 2009
Jean-Sebastien Graulich

7. Synchronization Problem
TOF and KL FEE in different VME Crates
Each crate receives separate DAQ trigger at the end of the spill
Perfect Synchronization needed for correlation between TOF and KL
MICE CM25 Nov 2009
Jean-Sebastien Graulich

8. Understanding the Problem
Synchronization can be lost because of
Unstable electronics in DAQ trigger distribution
Unstable behavior of the VME/Pci Interface
The DAQ software release the busy and enables the DAQ trigger receiver channel after readout
Must go through the VME/Pci Interface
It happens that one of the two commands is not executed properly…
Unpredictable
Cured only by a power cycle
Has to be monitored
MICE CM25 Nov 2009
Jean-Sebastien Graulich

9. Number of LDC receiving a DAQ Trigger per DAQ event
DAQ Trigger Monitor
counts
Number of LDC receiving a DAQ Trigger per DAQ event
# of DAQ Triggers
LDC Number
MICE CM25 Nov 2009
Jean-Sebastien Graulich

10. Particle Trigger monitor
Counts
TDCs
V1724
FADCs
Scalar ch0
V1731
FADC
Equipment number
# of Part Triggers
LDC Number
MICE CM25 Nov 2009
Jean-Sebastien Graulich

11. Jean-Sebastien Graulich
FADC behavior
During September Run
One FADC didn’t accept particle triggers at all
I am suspecting a hardware failure
Another FADC missed all the particle triggers for 1 single spill at the beginning of the run and then behaved normally
Need to be sorted out with CAEN
I need help here
MICE CM25 Nov 2009
Jean-Sebastien Graulich

12. Jean-Sebastien Graulich
FEE for TOF2
Needs (ignoring cabling and HV)
1 TDC V1290
5 FADC V1724
Splitters and Shapers available in Geneva
To be shipped
Issues
NIM crate room
Not sure the power supply will stand a full load
VME crate room
All TOF TDC must be in the same crate
TOF FADC will go to KL crate
A major update of crate layout is necessary !
MICE CM25 Nov 2009
Jean-Sebastien Graulich

13. Jean-Sebastien Graulich
Summary
TOF0/1 and KL in good shape
Cross talk needs attention
Synchronization has to be monitored
TOF2 installation is not trivial
MICE CM25 Nov 2009
Jean-Sebastien Graulich