This note is intended to summarize my understanding of the ladder, assembly and cable numbering schemes currently in use and (with corrections) serve as a reference for transferring information from the assembly to the cabling, database, and software work. I would appreciate it if people who are directly concerned look over the tables and give me any corrections necessary.

Cable labeling and partial installation is proceeding at D0. The labeling scheme does not correspond in all respects with the coordinate system decribed in http://www-d0.fnal.gov/~meena/d0_private/silicon/coords/smt-numb/sld001.htm which I will refer to as the "standard" system. The electronics scheme considers each half separately, with numbering starting at z=0 and increasing away from the collision point. The 180 degree rotation is not considered in the electronics numbering scheme and the north side is cabling is assumed to be identical to that of the south side. This results in substantial simplification in the planning and layout of the cable plant and readout crates. It does mean that the symmetric sequencer on the north side does not go the same STT sector and this routing needs to be done carefully. The cable labels do differ between the north and south sides in that the STT sector with proper geometry is encoded in the cable ID.

Note that the first half cylinder was thought to be installed in the NORTH half and I believe that the database barrel numbering still has this assumption. The F disks are properly numbered for the south half.

This is the "standard" label and coordinate system:
 
^ Y axis
South | North
|
Pbar--> H4 H3 F12 F11 F10 F9 B6 F8 B5 F7 B4 B3 F6 B2 F5 B1 F4 F3 F2 F1 H2 H1 <--P
/ <-- Zaxis
X axis
Phi=0

Note that ladders are numbered counterclockwise starting at phi = 0. This corresponds to the assembly numbering on the SOUTH side.

Cables are encoded as follows:
 
6
B
3
S
-
5
-
12
L_3
STT Sector number Assembly type Assembly # Half Layer Ladder/wedge # Type

 

With the entries defined as:
 
allowed
Field values comment
STT Sector number
1-6
 this changes with the 180 degree rotation for the north half and has "pass though" symmetry
Assembly type
B/H/F
 Barrel, H disk, or F disk
Assembly #
1-3
 (B) Assembly numbers are DIFFERENT than those in 
1-2
 (H) the standard coordinate system
1-6
 (F) Each half is numbered separately
Half
N/S
 North or South half
Layer
1-8
 (B) These correspond to the standard coordinate system
1-2
 (H) layer 1 is closer to z = 0 and layer 2 is farther from z = 0.
 
1-2
 (F) layer 1 is closer to z = 0 and layer 2 is farther from z = 0
Ladder/wedge #
1-12
 (B) These correspond to the standard coordinate system
1-24
 (H) on the SOUTH half, 180 degree rotation on the north
1-12
 (F)
Type
L_N
 n-chip ladder HDI (# corresponds to layers 1-4)
H_6
 6 chip H disk HDI
F_6
 6 chip F disk HDI (bias supplied on this side)
F_8
 8 chip F disk HDI

The assembly labels then have the following correspondence
 
 
 
Assembly Standard 
cable # System#
B3N B1
B2N B2
B1N B3
B1S B4
B2S B5
B3S B6
F6N F1
F5N F2
F4N F3
F3N F4
F2N F5
F1N F6
F1S F7
F2S F8
F3S F9
F4S F10
F5S F11
F6S F12
H2N H1
H1N H2
H1S H3
H2S H4