MWS source switchover yesterday was successful. Leakchecking went well. A small leak on the intermediate section sealed with a snug on the two bellows fixing bolts. The microwave window required cleaning. It tested leak-tight. All good. Pumpdown curve to come. Meanwhile, source was restarted last night. First 85Rb is on FC6 presently. Although OLIS has run Rb beam in the past using the SIS, this is a milestone for the MWS. Development to proceed today.
Later... Here is the pumpdown curve to last night. Base pressure reached less than 3e-8Torr, which is a very good pressure for the MWS. Prepare to shut down leak detector, which has been pumping on the roughing line overnight.
Later... First piece of a comprehensive mass scan. Brings a tear to my eye. Save: 101029_1125.snapiosfc6
Later... Scans completed. Data file. Among other things, the following isotopes were observed:
| A/q |
Current |
Isotopes |
| 14 |
1.5e-09 |
14N |
| 15 |
6.0e-11 |
15N |
| 16 |
1.3e-08 |
16O |
| 17 |
6.0e-10 |
17O |
| 18 |
6.5e-09 |
H2O, 18O |
| 19 |
1.7e-07 |
19F |
| 20 |
1.3e-09 |
20Ne |
| 21 |
7.0e-10 |
21Ne |
| 22 |
1.4e-10 |
22Ne |
| 28 |
4.2e-09 |
28Si |
| 29 |
2.0e-09 |
29Si |
| 30 |
4.2e-06 |
30Si, 60Ni+2 |
| 31 |
1.9e-08 |
31P |
| 32 |
4.2e-07 |
32S |
| 33 |
1.0e-09 |
33S |
| 34 |
3.3e-09 |
34S |
| 39 |
7.5e-10 |
39K |
| 41 |
5.0e-11 |
41K |
| 44 |
1.0e-10 |
44Ca |
| 45 |
1.6e-10 |
45Sc, 90Zr+2 |
| 46 |
6.5e-08 |
92Mo+2 |
| 47 |
3.2e-10 |
47Ti |
| 48 |
7.0e-10 |
48Ti |
| 51 |
3.0e-10 |
51V |
| 53 |
9.4e-10 |
53Cr |
| 60 |
6.5e-11 |
60Ni |
| 67 |
4.0e-10 |
67Zn |
| 69 |
1.3e-10 |
69Ga |
| 85 |
6.5e-10 |
85Rb |
| 87 |
2.3e-10 |
87Rb |
Spreadsheet
Scans Details
Attached is a separate scan in the region of 40 to 45, done in two directions. Data file (raw).
Leave 85Rb on FC6 for the weekend, or as long as it lasts! !1.3nA presently with 2.5mm slits in. I have increased the support gas flow slightly. |