Module Metrology

Bart and Peter have been learning to use the RAL

Smartscope ZIP 250

2

BAD GUYS

Previously operated without cooling(prompted Bart to make Interlock box)

Previously operated without cooling(during removal from UKDC1 Stavelet)

Liv13

3

GOOD GUYS

These modules are fine. They have been kept cool whenever operated.=> Excessive bow must be a product of uncooled operation. Anyone know why?

UKSP2

Chain of modules SP Staveletusing STAR PCBs from Ashley,

Power hookup with wires

5

UKSP2

CAM2 CAM4LIV21 LIV12

Power through 2mm connectors to facilitate

studies of differingchain combinations

6

IV curves @ 20C

0 50 100 150 200 250 3000

0.5

1

1.5

2

2.5

3

3.5

4

4.5

CAM2CAM4

V(volts)

I(mA)

0 50 100 150 200 250 3000

5

10

15

20

25

30

LIV12LIV21

V(volts)

I(mA)

FZ1 Sensors FZ2 Sensors

7

48.1C

47.4C

49.1C

45.7C

UKSP2, 9.5A 250V, 4 ON, 3PG@2fC2272-11

46.4C

43.4C

42.4C

46.9C

8

Special Feature: CAM1 built with one unshielded hybrid

Extra DTN occupancy at specific locations,related to use of non-blind vias.

(Easily avoided in future submissions.)

0.5fC Threshold

9

0

1

2

3

4

5

6

7

DTN: Four modules, single chainColumn 1.0fC 0.75fC 0.5fC 0.4fC 0.3fC

00 0 0 7 448 10032

01 0 0 18 599 12050

10 0 0 2 135 4824

11 202 2932 18505 29384 50386

20 0 0 0 52 1415

21 0 0 0 33 1217

30 0 0 4 134 4434

31 0 0 5 173 5815

40 0 0 11 297 4842

41 0 0 1 99 1895

50 0 0 17 364 6235

51 0 0 35 665 7794

60 0 0 609 7855 58112

61 0 0 640 7720 55345

70 0 2 1785 15317 83469

71 0 1 1770 14537 77866

2272-14

NS

10

0

1

2

3

4

5

6

7

DTN: M3 aloneColumn 1.0fC 0.75fC 0.5fC 0.4fC 0.3fC

00

01

10

11

20

21

30

31

40

41

50

51

60 0 0 13 603 11977

61 0 0 4 374 8769

70 0 0 13 327 7370

71 0 0 12 401 8386

2272-25

NS

=> Significant Improvement!

11

0

1

2

3

4

5

6

7

DTN: Four modules, two chainsColumn 1.0fC 0.75fC 0.5fC 0.4fC 0.3fC

00 0 0 12 465 10147

01 0 0 18 608 12155

10 0 0 1 115 4973

11 202 2951 18561 29259 50614

20 0 0 2 44 1418

21 0 0 0 34 1166

30 0 0 1 130 4400

31 0 0 4 213 5930

40 0 0 6 196 3896

41 0 0 2 85 1748

50 0 0 18 561 7875

51 0 0 95 1004 10097

60 0 0 20 669 14726

61 0 0 16 505 12420

70 0 0 17 569 10476

71 0 0 26 728 12448

2276-9

NS

=> Improvement Maintained!

12

Interpretation & Analysis• M3 is fine when operated on its own

– Suggests the “hollow square” is perfectly adequate for referencing purposes

• M3 is fine when all modules are operating as long as it has its own power supply– Suggests the “hollow square” is perfectly adequate for shielding

purposes• Yet M3 is not fine when operated in the same chain as the others

– Suggests that CM is developing along the SP chain

• Quick trials with caps and wires indicated that coupling the shield / referencing square to EoS ground could help– Time to implement this properly

13

0

1

2

3

4

5

6

7

DTN: Four modules with CMR capsColumn 1.0fC 0.75fC 0.5fC 0.4fC 0.3fC

00 0 0 24 662 12712

01 0 0 28 713 14279

10 0 0 1 110 4894

11 203 2846 18188 28848 49868

20 0 0 1 48 1353

21 0 0 1 31 1165

30 0 0 4 152 4632

31 0 0 2 207 6127

40 0 0 0 39 1136

41 0 0 0 10 352

50 0 0 0 23 926

51 0 0 1 36 1615

60 0 0 12 433 11012

61 0 0 9 436 10203

70 0 0 42 578 10054

71 0 0 14 642 11284

To EoS GND

2279-1

NS

10mF

10mF

10mF

=> Looks great. Has this affected ENC noise?

Implementation

14

48.1C

47.3C

49.1C

45.6C

UKSP2, 9.5A 250V, 4 ON, 3PG@2fC2279-11

46.4C

43.4C

42.2C

46.8C

15

Difference between 2279-11 and 2272-11(4on, 9.5A, 250V, with and without CMR caps)

16

DTN at 0.5fC

Basically empty!

Module 0 Module 1

17

DTN at 0.5fC

Module 2 Module 3

Basically empty!

18

DTN at 0.4fC

Module 0 Module 1

Not too bad!

19

DTN at 0.4fC

Module 2 Module 3

Not too bad!

20

Preliminary Conclusions

• CofM STAR SP works well– ENC values within range expected due to temperature

variation• We understand how to make the reference ties within a

module.– Hollow square is adequate

• The shield is probably not required – more work to do on this

• CM develops along the SP chain– can be removed by adding capacitors to LVDS screen– May or may not be sufficient in a longer chain

Perhaps we actually understand what we’re doing!