KoheiMitsuhashi - 17:43, Sunday 06 November 2022 (3103)
beam fitting after AOM and lens, and checked the RF frequency.
Mitsuhashi, Shalika-san
What we did:
1.We measured the RF work about frequency, and the result was as follows. and the picture was attached. And we change the Tuning Voltage according to the result.
| Tuning Voltage[V] | RF frequency[Hz] |
| 9.600 | 79.58±0.24 |
| 9.745 | 80.25±0.09 |
| 9.750 | 80.09±0.19 |
| 9.755 | 80.27±0.13 |
| 9.850 | 80.60±0.40 |
2.We measured the beam profiling and try to fit the beam propagation after LB1909-C. The result was as follows, and the picture was attached.
We thinked the result was not good.
| position X[mm] | Major Beam Radius[mm] | Minor Beam Radius[mm] |
| 65 | 0.258±0.003 | 0.210±0.006 |
| 80 | 0.243±0.002 | 0.188±0.003 |
| 106 | 0.247±0.003 | 0.204±0.006 |
| 120 | 0.267±0.003 | 0.193±0.002 |
| 150 | 0.278±0.002 | 0.202±0.002 |
| 167 | 0.261±0.002 | 0.235±0.005 |
| 180 | 0.265±0.002 | 0.238±0.009 |
| 210 | 0.301±0.001 | 0.253±0.001 |
| 240 | 0.337±0.001 | 0.238±0.003 |
What we will do next:
When we measured the beam radius, we used ND filter(ND=3.0). We thinked that ND filter maked interfere, and it maked the result bad.So we will use HWP and PBS instead of ND filter.
The set up was attached.
Images attached to this report
