Star-tpc-l mailing list

["Van Buren, Gene" <gene AT bnl.gov>]

Hi,

Here is the relevant database content for the shorted ring in the IFC west 
during the cosmic data taking before Run 22, along with the explanations of 
the database table's fields. I do not have very high confidence in the 
location ("ring") of the short that I selected. A reminder that a fully 
shorted pair of rings means that a single 2 MOhm resistor is bypassed 
("missing") by the short.

-Gene

> mysql -h dbx.star.bnl.gov -P 3316 -C Geometry_tpc -e "select 
> beginTime,ring,resistor,MissingResistance from tpcFieldCageShort where 
> beginTime between '2021-10-01' and '2022-01-01' and side=1 and cage=0 order 
> by beginTime asc"
+---------------------+--------------+------------+-------------------+
| beginTime           | ring         | resistor   | MissingResistance |
+---------------------+--------------+------------+-------------------+
| 2021-10-20 00:00:00 | 160.50000000 | 0.00000000 |        2.00000000 |
| 2021-11-15 21:52:00 | 160.50000000 | 3.00000000 |        2.00000000 |
| 2021-11-15 22:22:00 | 160.50000000 | 2.50000000 |        2.00000000 |
| 2021-11-15 23:07:00 | 160.50000000 | 1.50000000 |        2.00000000 |
| 2021-11-18 12:40:00 | 160.50000000 | 0.00000000 |        2.00000000 |
| 2021-11-18 21:45:00 | 160.50000000 | 1.50000000 |        2.00000000 |
| 2021-11-18 22:43:00 | 160.50000000 | 1.25000000 |        2.00000000 |
+---------------------+--------------+------------+-------------------+


> more $STAR/StDb/idl/tpcFieldCageShort.idl 
/*    tpcFieldCageShort.idl
*
*  Table: tpcFieldCageShort
*
*       description: *    provide info on shorted rings in the field cages
*/ 


struct tpcFieldCageShort { 

   float side;     /* 0 = east, 1 = west */
   float cage;     /* 0 = inner, 1 = outer */
   float ring;     /* ring location of the short (e.g. 169.5) */
   float resistor; /* MOhm value of added external resistor to resistor chain 
*/
   float MissingResistance; /* missing resistance */

 };