1. Cathode FE Board Update
Mani Tripathi, B. Bylsma, J. Gu,
S. Durkin, T.Y. Ling, C.L. Kim

2. Smallest FPGA Dominates SEUs ! Combining 3 FPGA give: 7.7x10-10cm2
SEU Results
Results from Davis
63 MeV P Beam
SEU Rates on FE Board
Smallest FPGA Dominates SEUs !
Combining 3 FPGA give: 7.7x10-10cm2
L.S. Durkin,FNAL 9/00

3. Combine 2 Spartans and CPLD into one chip…
SEU Results ...
Combine 2 Spartans and CPLD into one chip…
XILINX Virtex
Based on SEU measurement triple vote sensitive logic.
Controller FPGA (XLINX Virtex)
- triple voting logic on crucial gates
- SEU cross section 1.7x10-10cm-2 (410,000 s/SEU)
L.S. Durkin,FNAL 9/00

4. SEUs Results... FPGA Reload Scheme New Design 4.5x Less Sensitive
EPROM (XC1802) JTAG Reloadable
x1011n/cm kRad
- 3 SEU’s, No Memory Errors
- Must reload every 1.5 LHC years !
CCB
Program FPGA
Reset FPGA
EPROM
Virtex
5 msec
load
JTAG
Readback
FPGA
JTAG
Program EPROM
Readback EPROM
Schematic FE Board Loading
Reload every 15 minutes or when error is detected
L.S. Durkin,FNAL 9/00

5. Magnetic Field Test FE Board in 3 Tesla Field
MRI Facility Ohio State U. Hospital
8 Tesla Field Research Magnet
Tested calibration, noise, pedestal,
linearity. Only difference was a
time shift of 6 nsec
Passive Delays
- Rhombus LVMDM 100 nsec
contain iron
have switched to
- Data Delay Devices 3D7105
for short delays
- Virtex Delay-Lock loops
for long delays
no difference seen
t (nsec)
L.S. Durkin,FNAL 9/00

6. Spark Protection Scheme has protected Buckeye for Simulated
Spark Gap
100 M
70nH HV
4.2 KV
1nF
15
100pF
anode
protection
chamber
protection circuit
Scheme has protected
Buckeye for Simulated
3000 Sparks
Two Options Under Study
1. Inductor is Chamber- FE Board cable (100 nH/ft)
2. Put 32 Aircore (~60 nH) Inductors on FE Board
L.S. Durkin,FNAL 9/00

7. Click to edit Master title style Tantalum Capacitors
Trigger Channel Links
Removing the Channel Link (3 crossing delay) ...
Status
- one crossing required to
sync signals
- prototype has been built
and will be tested at
Ohio State and UCLA
- multiplexer will be rad
tested
Click to edit Master title style
Tantalum Capacitors
We have irradiated 15 tantalum capacitors in
the OSU reactor for 50 LHC year equiv.
Davis 63 MeV beam for 20 LHC year equiv.
We see no degradation of tantalum capacitors
We cannot find anyone else who has seen problems.
L.S. Durkin,FNAL 9/00