# Presentation: 949778

## Unbiased Channels, CFT Axial, 1-Dec-03

**Location   No of unbiased Layer    Fibers      Phi  Board**
**                     ****VLPCs    **
-    6B6 SVX7        8                        cftx2      2560-2620    4.5       456
-    7A2 SVX6        7                        cftx6      4760	               476
-    7A3 SVX5        6                        cftx6      5350
-    4B1 SVX0        8                        cftx7      2240-2305    1.6
-    9A3 SVX7        8                        cftx7      2625-2689    1.95
-    9A5 SVX7        7                        cftx8
- Looked at above boards with archiver: damage appeared after 0ctober 13 power outage.
-   7A2 SVX4        1 (1)                   cftx6       5040
-   7A3 SVX4        1 (1)                   cftx6       5240
-   7A2 SVX1        2                        cftx6       5400
-   7A0 SVX7        3 (1,2,8)             cftx6       5650
-   6A2 SVX7        1 (1)                   cftx7         920
-   4B0 SVX1        3 (2,3,6)             cftx7       1450
-   4B6 SVX7        2                        cftx8       2350
-   5A6 SVX4        3
- Total 480 VLPC pixels

## 6B6 current versus time

## 7A2 current versus time

## 3A7 current versus time

## Other problems in CFT axialSome SVXs need odd thresholds

- 8A3 SVX1 board 609 does not rspond to vref
- 8A5 SVX0 board 461 readout errors
- 6B7 SVX0 board 451 readout errors
- 6A6 SVX0 board 518 readout errors
- 3A1 SVX0 board 489 needs odd SVX threshold
- 6B1 SVX0 board 581 needs odd SVX threshold

## Unbiased Channels, CFT Stereo + CPS 1-Dec-03

**Location   No of unbiased Layer      Fibers     Phi **
**                     ****VLPCs    **
-  1B0 SVX4        8
-  1B1 SVX0        8
-  2A0 SVX7        8
-  2A5 SVX2        5
-  2B4 SVX0        4
-  3A0 SVX7        5
-  3A4 SVX7        8
-  3A7 SVX3        6                        cps                                              cps
-  3A7 SVX7        8                        cftu1          641-704
-  3B0 SVX0        5
-   3B1 SVX7       4
-   3B3 SVX3       7                                                                      cps
-   3B4 SVX2       7
-   3B6 SVX3       7
- Looked at above boards with archiver: damage appeared after 0ctober 13 power outage.
-  1B0  SVX7       3
-  2B1 SVX3        3
-  3B2 SVX6        1
-  3B7 SVX3        1                                                                      cps
-  4A4 SVX7        3
-  AB6 SVX6       3
-  BB5 SVX7        1 (8)
-  4A6 SVX7       3                                                                       cps
-  4A7 SVX7       3                                                                       cps
-  9B2 SVX0       1                                                                       cps
-  9B6 SVX0       1                                                                       cps
- Total 880 pixels

## Dead cft channels

**         ****6-May-03                                    15-August-03**
**Layer Total Dead  Dead VLPC        Total Dead Dead VLPC**
- cftx1	  3	  0	2560	      5
- cftx2	  17	  8	3200	      17	      8
- cftx3	  23	  8	3840	      15	      0
- cftx4	  6	  0	4480	      6
- cftx5	  16	  0	5120	      16
- cftx6	  29	  16	5760	      21  	      8
- cftx7	  22	  8	6400	      36	      **16**
- cftx8	  24	  8	7040	      33	      **16**
- cftu1	  13	  0	2560	      13
- cftu2	  13	  0	3840	      14
- cftu3	  33	  16	5120	      33	      16
- cftu4	  19	  0	6400	      21
- cftv1	  2	  0	3200	      1
- cftv2	  9	  0	4480	      13
- cftv3	  27	  0	5760	      36	       **8**
- cftv4	  19	  0	7040	      31
**Total****	****  275****	****64****	****76800****	****     311      72 (9 chips)**
**Latched****	**
- Date	       Slot     SVX    VLPC
- 2002	  5A0/cr50	     6	8
- 2002	  5B5/cr50	     7	1
- 2002	  6A5/cr50	    4
- 2/12/2003	  8B3/cr50	    4	1
- 2/12/2003	  8B3/cr50	    4	4
- 3/12/2003	  3B1/cr51	    0	1
- yr 2002	  9B4/cr52	    7	2
- yr 2002	  AA5/cr52	    1	3
**Total latched: 8 VLPC chips****	****	****	****	****	**