Transcript nngroup.physics.sunysb.edu

SCANNER THOUGHTS AND
DESIGNS
NN Group
Dmitriy Beznosko| Stony Brook
ELECTRONICS FOR THE SOURCE SCAN
• Have >256 channels per P0D (total of 264),
• Limited cable lengths, need to place the boards on some support surface
near the scanner
• Will need for electronics part: 5 trip-t (TFB) boards (& 30% spare so+1 at
least)
– Total – 6 boards
– Sufficient RMM boards for 5 TFBs +1 spare
– Also MPPC connection cables with connectors matching trip-t board
– The readout software package with instructions on setup and use
• P.S. one TFB with one RMM will be appreciated as soon as one is available, with software, so
that testing and daq assembly can be started, the rest as they get produced (in March?)
TFB
Micro-coax
connectors
Quite delicate
CONSIDERATIONS & REQUIREMENTS
• 64 sensors connect to each TFB, necessitates longer (~1m) cables
– Only 30cm cable on each sensor available
• Need to minimize number of reconnections to TFB itself, and comply with
cable length – suggest daughter board in between TFB and sensors
Daughter
board
Daughter
board
TFB
RMM
P0Dule
Daughter
board
ELECTRONICS FOR THE SOURCE SCAN – DAUGHTER BOARD
• To preserve the micro-coax connectors on the TFB, suggest to have
intermediate daughter boards for frequent sensor connections
• The size of these boards can be large for easy access to connectors
• Adds additional cable length so can utilize all 64 TFB channels
• Each TFB corner has 16 channels
• 16 channels (16*3cm/2) is 24cm on the P0Dule
• suggest each daughter board be comparable in size (~20cm)
• Triple layer pcb board suggested (top and bottom layers as ground), or
double layer
• Conceptual design is shown for double layer board
DAUGHTER BOARD CONCEPTUAL DESIGN
Aligned spacing of
mini-coax connectors
for ease of access
Separate conductors
for shielding of cable
with HV and signal
(shown for one line)
RED - Mini-coax
connectors
Green – etched out zone
Top ground plane
34 pin connector for 16 signal + 16 ground
• The board is ~20cm long, allows for easy coax connect-disconnect.
• The 34-pin connector goes to 16 coax cables in a ribbon, that connect to the Trip-T board. This
34pin with quick lock on it connector allows for many connect-disconnect cycles without
damaging trip-t connectors. Two non connected pins are used for proper connector orientation.
• Few spares of this daughter board will be required, to be replaced when mini-coax connectors on
any one fail. Cheap(er) and easy solution.
SCHEMATICS OF THE FINAL SETUP FOR SCANNER
• Unclear moment:
• Is micro-coax connectors
readily available? What
is the part #? Do we
crimp it or cable can be
ordered ready?
• What is resistance of the
cable from the MPPC?
50, 75? Do we
need to match that
exactly with the ribbon
cable between daughter
board and TFB?
Ribbon coax (16ch)
to TFB (~70-90cm)
30cm cables
from MPPCs
P0Dule
Scanning Table edge