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[videbaek <videbaek AT bnl.gov>]

As I was not at the meeting today, let me understand the 'the issue a 
little better from the
minutes. Does this mean the previous statement that the FF and RFF had 
different cosmic calibrations was wrongly concluded, and the culprit at 
different external resistors was used. I vaguely recall
this exercise to minimize the effect of the ring short.

best Flemming



On 2024-05-16 12:34, Van Buren, Gene via Star-tpc-l wrote:
> 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 */
>
>  };
>
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--
Flemming Videbaek
senior scientist, emeritus
videbaek @ bnl.gov
Brookhaven National Lab
Physics Department
Bldg 510D
Upton, NY 11973

phone: 631-344-4106
cell     :  631-681-1596