User name Solvignon
Log entry time 12:37:40 on January21,2003
Entry number 92804
keyword=EPR tests with gradient coils onThe target is in empty target position for beam study.
The gradient coils are ramped to 5 A each, 0.5 A per minute.
In the following:
Tgc= Transverse gradient coils; Lgc= Longitudinal gradient coils.
1) Tgc= 5A, Lgc =5A (figure #1)
dn: P=(36.38 +/- 0.29)%
up: P=(35.02 +/- 0.28)%
2) Tgc= 5A, Lgc =4A
dn: P=(35.40 +/- 0.32)%
up: P=(33.90 +/- 0.30)%
holding field at 24.38 G
3) Tgc= 5A, Lgc =3A
holding field at 24.35 G
dn: P=(34.63 +/- 0.30)%
up: P=(33.51 +/- 0.30)%
holding field at 24.34 G
4) Tgc= 6A, Lgc =3A (figure #2)
holding field at 24.33 G
dn: P=(33.98 +/- 0.35)%
up: P=(33.19 +/- 0.39)%
holding field at 24.33 G
5) Tgc= 6A, Lgc =2A
holding field at 24.32 G
dn: P=(34.12 +/- 0.28)%
up: P=(32.03 +/- 0.48)%
holding field at 24.31 G
From this test, EPR is more stable for settings #4.
But it's also the only measurement with the field stable.
I stopped the tests for now because the polarization dropped
at 32% but I will need to do more tests during the next long
down time.
FIGURE 1
FIGURE 2
