1. Vereinfachung der CBM TRD Elektronik
David Emschermann
GSI Darmstadt

2. Outline TRD TDR Geometrie v16b TRD v17a - minimale Anzahl FEB Typen
TRD v17b – mit nur einem ROB Typ

3. TRD v16b components

4. TRD v16b layer 1

5. TRD v16b layer 2

6. TRD geometry v16b The TRD geometry v16b as described in the TDR:
SIS 100 1 4
200
280
1384
1112
8992
287744
station
layers
modules
ROBs
GBTx
FEBs
32ch ASICs
channels

7. TRD geometry v16b 90/9/14/2 50/5/8/1+1 30/6/5/1 64/8/10/2 32/4/5/1
24/3/3/1

8. 64ch signal cable connection
64-pin connectors
are solderd to the
pad plane
flat cables are used
to connect to the
electonics
64-pin cables
interface to
2x 32ch-SPADICs
64 pin cable
0.5 mm pitch
AXON FFC 0.50 A 64 / 0150 S 3,5-3,5-08,0-08,0 F AJJ / N

9. 32ch signal cable connection
40-pin connectors
(for historical
reasons)
are solderd to the
pad plane
flat cables are used
to connect to the
electonics
40-pin cables
interface to
1x 32ch-SPADIC
40 pin
cable
0.5 mm
pitch
AXON FFC 0.50 A 40 / 0046 L S ABB

10. ROB-5 on all small TRD modules
TRD v17a -
Reduction of FEB types
&
ROB-5 on all small TRD modules

11. TRD v17a components

12. Type 3 v17a modification =>
Replace FEB-5x1 which only occurs on module type 3
by FEB-5x2 to reduce FEB diversity.

13. Pad plane type 3 v17a
=>
Instead of 2, read 4 rows per connector. This leads to longer wire traces on the pad plane, larger capacity and slight noise increase.
It saves 1 FEB type.

14. Type 3 v17a pad block
=>

15. for all small TRD modules
ROB-5 as default ROB
for all small TRD modules

16. ROB-5 as default readout
ROB-5 (70 e-links)
small modules:
read 3x FEB-5x2 (60 e-links)
60/70 = 86% e-link efficiency
large modules:
read 4x FEB-8x1 (64 e-links)
64/70 = 91% e-link efficiency
Identical FEB-ROB interface on all small or large modules.
Use ROB-3 on module type 8.

17. Type 2 v17a modification =>
Switching ROB-3 with a ROB-5 gives the opportunity to add one additional FEB 5x2 for free. 89% -> 86% uplink efficiency.

18. Instead of 5 rows, 6 rows. Make better use of available e-links.
Pad plane type 2 v17a
=>
Instead of 5 rows, 6 rows. Make better use of available e-links.

19. Type 2 pad block v17a
=>
Pad length drops from 16x 2.75 cm + 4x 2.50 cm to 24x 2.25 cm.

20. Module type 2 v17a 24 rows, 80 columns 1920 pads 1.52 cm² pad size
30x 64-pin connectors
5 connectors per row
4 rows per connector

21. Instead of 2x ROB-7 use 3x ROB-5.
Type 1 v17a modification
=>
Instead of 2x ROB-7 use 3x ROB-5.

22. Type 1 pad plane v16b/v17a 36 rows, 80 columns 2880 pads
1.01 cm² pad size
45x 64-pin connectors
5 connectors per row
4 rows per connector

23. TRD geometry v17a 90/9/15/3 60/6/10/2 30/3/5/1 v17a 64/8/10/2 32/4/5/1
16/2/3/1

24. From v16b to 17a - small 90/9/14/2 50/5/8/2 30/6/5/1 92% 89% 86% v16b
e-link efficiency
0/0/+1/+1
+10/+1/+2/2
0/-3/0/0
v17a
86%
86%
86%
90/9/15/3
60/6/10/2
30/3/5/1

25. From v16b to 17a - large 64/8/10/2 32/4/5/1 24/3/3/1 91% 91% n/a v16b
69%
with
ROB-5
e-link efficiency
unchanged
unchanged
-8/-1/3/1
v17a
91%
91%
76%
64/8/10/2
32/4/5/1
16/2/3/1

26. Optimise readout efficiency
TRD v17b -
Optimise readout efficiency

27. TRD v17b components
8 -> 7 ASICs

28. Small module readout v17b
Default readout
ROB-3 (42 e-links)
small modules:
read 2x FEB-5x2 (40 e-links)
40/42 = 95% e-link efficiency
Multiple of 2 FEBs on modules
Identical FEB-ROB interface on all small modules.

29. Large module readout v17b
Default readout
ROB-3 (42 e-links)
large modules:
read 3x FEB-7x1 (42 e-links)
42/42 = 100% e-link efficiency
Multiple of 3 FEBs on modules
Identical FEB-ROB interface
on all large modules.

30. TRD geometry v17b 100/10/15/5 60/6/9/3 40/4/6/2 63/9/9/3 42/6/6/2
21/3/3/1

31. From v17a to 17b - small 90/9/15/3 60/6/10/2 30/3/5/1 86% 86% 86% v17a
e-link efficiency
+10/+1/0/+2
0/0/-1/+1
+10/+1/+1/+1
v17b
95%
95%
95%
100/10/15/5
60/6/9/3
40/4/6/2

32. From v17a to 17b - large 64/8/10/2 32/4/5/1 16/2/3/1 91% 91% 76% v17a
e-link efficiency
-1/+1/-1/+1
+10/+2/+1/+1
+5/+1/0/0
v17b
100%
100%
100%
63/9/9/3
42/6/6/2
21/3/3/1

33. Comparing e-link efficiencies
v16b
v17a
v17b
v16b
v17b

34. Geometry summary geometry – module FEB ROB uplink
types types types efficiency
TDR v16b
v17a
v17b 6 3 2 3 2 1
~90%
86%
97%
From v16b to v17b numbers increase as follows:
from to (+12%)
from to (+12%)
from to (+ 6%)
from to (+77%)
from to (+ 8%)
channels
ASICs
FEBs
ROBs
GBTx :

35. TRD FEBs and ROBs FEB-8-1 - split into: FEB-4-1L & FEB-4-1R
Build a FEB-1-2
to check feasibility of FEB-5-2

36. FEBs for beamtests DESY: Aug 17 FEB-1-1 or FEB-1-2 e-link readout
GIF++: Oct 17
FEB-[1-5]-1
e-link readout
miniCBM: Sep 18
FEB-7-1
or many FEB-1-1
ROB-3 readout

37. ROB interconnect (2010) ROB-3 can be arranged as readout busbar,
interfacing FEBs without need of additional cabling.

38. Thank you

39. Thank you

40. Backup

41. TRD v16b -
TDR version

42. Module type 1 FEBs 2880 channels 45x cable connections
9 FEBs a 5x2 ASICs
2x GBTx ROB-7
16 optical links
2x down- 14x uplink
180/196 e-links used
92% uplink efficiency

43. Type 1 pad plane v16b/v17a 36 rows, 80 columns 2880 pads
1.01 cm² pad size
45x 64-pin connectors
5 connectors per row
4 rows per connector

44. Type 1 pad block v16b channel sequence determined by angular pad order
identical pattern
for all footprints of
a given module type
all vias within a pad
row are along a
straight line (simpler
to seal with glue
for gas tightness)
16 pads block width
4 rows a 16 pads = 64 pads

45. Module type 2 FEBs 1600 channels 25x cable connections
5 FEBs a 5x2 ASICs
1x GBTx ROB-3
1x GBTx ROB-5
10 optical links
2x down- 8x uplink
100/112 e-links used
89% uplink efficiency

46. Type 2 pad plane v16b 20 rows, 80 columns 1600 pads 1.69 cm² pad size
25x 64-pin connectors
5 connectors per row
4 rows per connector

47. Type 2 pad block v16b

48. Module type 3 FEBs 960 channels 30x cable connections
6 FEBs a 5x1 ASICs
1x GBTx ROB-5
6 optical links
1x down- 5x uplink
60/70 e-links used
86% uplink efficiency

49. Type 3 pad plane v16b 12 rows, 80 columns 960 pads 3.04 cm² pad size
30x 32-pin connectors
5 connectors per row
2 rows per connector

50. Type 3 pad block v16b This type of connector layout is also used on
all large detectors,
module types 6,7,8

51. Module type 6 FEBs 2048 channels 64x cable connections
8 FEBs a 8x1 ASICs
2x GBTx ROB-5
12 optical links
2x down- 10x uplink
128/140 e-links used
91% uplink efficiency

52. Type 6 pad plane v16b 16 rows, 128 columns 2048 pads 4.13 cm² pad size
64x 32-pin connectors
8 connectors per row
2 rows per connector

53. Module type 7 FEBs 1024 channels 32x cable connections
4 FEBs a 8x1 ASICs
1x GBTx ROB-5
6 optical links
1x down- 5x uplink
64/70 e-links used
91% uplink efficiency

54. Type 7 pad plane v16b 8 rows, 128 columns 1024 pads 8.27 cm² pad size
32x 32-pin connectors
8 connectors per row
2 rows per connector

55. Module type 8 FEBs 768 channels 24x cable connections
3 FEBs a 8x1 ASICs
1x GBTx ROB-3
4 optical links
1x down- 3x uplink
24/42 e-links used
(only 1 e-link per Spadic)
cannot be done with
Spadic v2.0
57% uplink efficiency

56. Type 8 pad plane v16b 6 rows, 128 columns 768 pads 10.96 cm² pad size
24x 32-pin connectors
8 connectors per row
2 rows per connector

57. From v16b to 17b - small 90/9/14/2 50/5/8/1+1 30/6/5/1 92% 89% 86%
e-link efficiency
+10/+1/+1/+1
+10/+1/+1/+1
+10/-2/+1/+1
v17b
95%
95%
95%
100/10/15/5
60/6/9/3
40/4/6/2

58. From v16b to 17b - large 64/8/10/2 32/4/5/1 24/3/3/1 91% 91% n/a v16b
69%
with
ROB-5
e-link efficiency
-1/+1/-1/+1
+10/+2/+1/+1
-3/0/0/0
v17b
100%
100%
100%
63/9/9/3
42/6/6/2
21/3/3/1

59. Conclusions

60. TRD wire geometry TRD 3.5/3.5/5 5 signal collection time Data readout
7/2
7/2 5
signal collection time
Data
readout
255 ns
230 ns
210 ns
TRD 3/3/6
TRD 3.5/3.5/5
TRD 4/4/4 A A D
42% drift
12 mm
thickness
signal collection in Xe/CO2 100V/mm drift

61. TRD wire geom v17b large TRD 444 4 4 4 Data readout A A D 12 mm
33% drift
12 mm
thickness

62. Pad response function We have aimed at a signal distribution
of %
between the central and neighboring pads, which is achieved according to beam
test data from 2015,
see PRF function on the left side.

63. Summary Compared to the TRD geometry v16b in the TDR, with v17b:
the number of FEB types can be reduced to 2
the number of ROB types can be reduced to 1
the e-link efficiency can be increased to 97%
the pad size increases from 7.2 mm to 8.2 mm
for the large modules (size tested in 2010)
the wire geometry of the large modules should
be increased to 4/4/4 to keep the PRF at 1/8/1

64. Recommendation of the referees:
From the TRD TDR review
Recommendation of the referees:
In these slides I will show
how this can be achieved.

65. very difficult to do the routing for smallest pad size
Triangular pads 0.5 cm²
Super density
very difficult to do the routing for smallest pad size

66. Thank you

67. Small module readout Pad size 2010: 5 mm x 20 mm 8 mm x 20 mm
Pad size FEB-5x2:
540mm / 80 = 6.75 mm
Pad size FEB-8x1:
920mm /128 = 7.19 mm
Pad size FEB-7x1:
920mm /112 = 8.21 mm