Recently, the ICON-NMR queue on BigSur has been failing more often than usual. Sarah traced these errors to spinning problems. She tried our usual methods (recalibrating spins) to solve this problem. However, error messages still disrupt the queue. This afternoon, I took more drastic measures. I removed the probe to check for a cracked insert. The quartz insert was fine. Then, with help from Nadia of the APL lab I removed the shimstack.
HOLY COW. It was the most gunked up shimstack I have ever see. I'm shocked samples would spin at all. I cleaned the shimstack and reinserted into the magnet. After a 3D topshim (presumably necessary because I didn't get the shimstack back into the magnet at the same angle I took it out) I tested the shims on the lineshape sample. My results are 0.28; 3.5/10.9, just missing spec. But close enough to use.
Justin
Monday, October 18, 2010
Monday, October 11, 2010
NMR outages 10/14 & 10/15
FO has decided that there will be several outages over fall break that will affect the access to NMR in Malott.
#1) On Thurday 10/14 Florence (the 400 on the 3rd floor of Malott) will not be available. There will be no lab air from 8 AM to 10 PM and (as all of you know) we use compressed air to get the sample in and out of the magnet. Hence, I will shut down Florence from Thursday morning at 8 AM to Friday morning at 8 AM.
#2) On Friday 10/11 from 1-3 PM there will be a power outage in the new side of Malott. This outage will force me to shut down Paris and Siena (500s in Malott basement) at ~noon on Friday. Furthermore, I will have to warm my cryoprobe starting at ~8 AM. I will get Paris back up and running on Friday afternoon by 4 PM. Siena is a bit more complicated (see below).
#3) We have noticed that our cryoprobe is not behaving as well as it once did. Any troubleshooting will require us to remove the probe from the magnet. Since we have to warm the probe on Friday we will use this time to troubleshoot issues with the cryoprobe. The downside is that we will not be able to cool the probe back down right away. Our tentative plan (assuming that we can fix our problem and not have to send the probe to Bruker for repairs) is to recool the probe on Tuesday 10/19. Hence, the cryoprobe will be available on Wednesday 10/20 at the earliest.
We apologize for the inconvenience,
Justin
#1) On Thurday 10/14 Florence (the 400 on the 3rd floor of Malott) will not be available. There will be no lab air from 8 AM to 10 PM and (as all of you know) we use compressed air to get the sample in and out of the magnet. Hence, I will shut down Florence from Thursday morning at 8 AM to Friday morning at 8 AM.
#2) On Friday 10/11 from 1-3 PM there will be a power outage in the new side of Malott. This outage will force me to shut down Paris and Siena (500s in Malott basement) at ~noon on Friday. Furthermore, I will have to warm my cryoprobe starting at ~8 AM. I will get Paris back up and running on Friday afternoon by 4 PM. Siena is a bit more complicated (see below).
#3) We have noticed that our cryoprobe is not behaving as well as it once did. Any troubleshooting will require us to remove the probe from the magnet. Since we have to warm the probe on Friday we will use this time to troubleshoot issues with the cryoprobe. The downside is that we will not be able to cool the probe back down right away. Our tentative plan (assuming that we can fix our problem and not have to send the probe to Bruker for repairs) is to recool the probe on Tuesday 10/19. Hence, the cryoprobe will be available on Wednesday 10/20 at the earliest.
We apologize for the inconvenience,
Justin
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