This section will describe how signals are generated by the computer at the Flight simulators and are delivered to a specific photmultiplier tube. In the process of designing and building some features of the wiring have become complicated.  For the most part the details are only an issue in the control boxes internal wiring.

 

There are 20 hex houses and 10 penthouses. Each section has two pmt’s (inner and outer). To independently pulse all pmt’s 340 triggers are required.  The Flight simulators provide the triggers.  The trigger delivery is designed using 32 pin ribbon cables and each ribbon cable carries 16 triggers. Therefore 22 FS channels [34 pin] are required.  The current flight simulators have 2 ribbon cable headers (32 channels of triggers). Therefore, for complete independence, 11 of the current FS are required.  The control boxes are designed so that some multiplexing is available. Inputs to one box can be fed to other boxes. 

The summer 2004 setup uses three flight simulators to generate all the LED triggers.

 

Detector

20 hexhouses, 10 penthouses

340 pmts

FS (2003 version)

32 channels on two 34 pin ribbon

11 FS

Driver boxes

16 driver boards, 2 pmts/ board (I/O)

11 driver boxes

 

 

Cabling Details starting with the Flight Simulator

The front panel of the FS is shown below triggers are defined to run from 0-31. The corresponding channel on the ribbon cables and subsequently in the driver boxes is shown and the pin numbers on the ribbon cable are also provided.  Each flight simulator is placed in a VME crate and controlled via its VME address. The fundamental clock that is used to generate the triggers comes from an external source.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

clock in

MIDAS

JMU

 

 

 

 

 

 

 

FS

ecl board inputs

 

 

 

 

 

 

channel

channel

 

 

 

 

TOP

34

33

gnd

unused

 

 

 

 

32

31

0

16

 

 

 

 

30

29

1

15

 

 

 

 

28

27

2

14

 

 

 

 

26

25

3

13

 

 

 

 

24

23

4

12

 

 

 

 

22

21

5

11

 

 

 

 

20

19

6

10

 

 

 

 

18

17

7

9

 

 

 

 

16

15

8

8

 

 

 

 

14

13

9

7

 

 

 

 

12

11

10

6

 

 

 

 

10

9

11

5

 

 

 

 

8

7

12

4

 

 

 

 

6

5

13

3

 

 

 

 

4

3

14

2

 

 

 

 

2

1

15

1

 

 

 

 

 

 

 

 

 

 

 

 

 

BOTTOM

34

33

gnd

unused

 

 

 

 

32

31

16

16

 

 

 

 

30

29

17

15

 

 

 

 

28

27

18

14

 

 

 

 

26

25

19

13

 

 

 

 

24

23

20

12

 

 

 

 

22

21

21

11

 

 

 

 

20

19

22

10

 

 

 

 

18

17

23

9

 

 

 

 

16

15

24

8

 

 

 

 

14

13

25

7

 

 

 

 

12

11

26

6

 

 

 

 

10

9

27

5

 

 

 

 

8

7

28

4

 

 

 

 

6

5

29

3

 

 

 

 

4

3

30

2

 

 

 

 

2

1

31

1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Cables from the FS bring triggers to the Driver boxes. The back panel is shown below. There are four connectors. Two are required to supply the 32 independent triggers. The other two are for multiplexing (passing the triggers to another box).

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Both top connectors are connected to same points internally (duplicate connectors)
Both bottom connectors are connected to same points internally.
Boxes are mounted vertically but bottom refers to the connector closest to the box wall.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DRIVER BOX

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

back of the box

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

top

 

 

 

 

 

 

top

 

 

 

 

 

 

 

 

 

 

1

2

3

4

5

…16

 

1

2

3

4

5

…16

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

bottom

 

 

 

 

 

 

bottom

 

 

 

 

 

 

 

 

 

 

1

2

3

4

5

…16

 

1

2

3

4

5

…16