Jan 3 - Jan 7 Installation of fridge and check new jlab pump cooldown preparations Standard and UVA-cold NMR tests Reconfigured Vacuum setup for this cooldown (still use ROOT for initial Vac) Two Turbos in parallel 1000 (backed by little dry-pump) + 3000 (backed by TOPS) This turbo configuration works but its not going with us to fermilab (except the 3000) -I will check functionality of the big turbo soon Vac: 9X10^-5 Jan 8 Fill mag with LN2 Vac:3.7X10^-6 Jan 9 3000L all in 500L-dewars Fill LHe initial cooling was normal and smooth inital fill of separator and fridge was smooth Jan 10 atmosphere sneaked into system while adding LANL manometer Jan 11 - Jan 13 mostly dealing with atmosphere in system everything back to normal by end of 13th Also noticed that the jumper lines from Oxford do not stay well insulated with out a blank-off over the vacuum pump-out end, and even in this situations its probably good to pump them out every few days Got stick in and able to start TE and NMR studies Jan 14 one of the UVA white mechanical pump has died, used aux as needed Quenched from connecting heater without shim power supply on (this should always be left on during running). In this situation the supply wants to have the leads ramped up to the last setpoint but the magnet current (and field) is zero. So you have to try to turn the heater on at the last setpoint the power supply remembers. Once you try to connect the heater the PS will take over and ramp the leads down and then turn on the heater at zero. These type of quenches only use about 20-30L of LHe, the magnet remains almost completely covered in LHe. So in this regard they are soft quenches but the field is totally gone so you have to ramp all the way back up. Jan 14 - Jan 18 polarized NMR comparison Study TE comparison Study S/N comparison LANL and UVA systems seem to be within the sub-percent range in comparison LANL cold NMR connected but unverified Jan 18 Also Polarized ND3 ~20% (material limitation) Jan 19 - Jan 22 Studies on position vs polarization: looked at three different cell positions and 3 coils for each position the results are not very different except noise level which is due to bad NMR connections (not able to reach 90% for most positions, but they are all polarizing) Conclusion on studies: There is a power limitation, it takes longer to polarized with the setup but all target cell positions are doing about the same. This means we have all cell positions to choose from for the most part. I think all 4 cell location might be usable even if the top one is partially in resonance. All functioning NMR coils are seeing the same polarization within ~5%, this difference is likely due to material quality differences and not microwave differences (but still not confirmed), but more work on this would be good Cell Position 1 coil1:~80% coil2:~85% coil3:~80% Cell Position 2 Not Tested Cell Position 3 coil1:~78% coil2:~85% coil3:N/A Cell Position 4 coil1: N/A coil2:~80% coil3:~85% The material loading is very very challenging for this main insert and a special loading tub will need to be build it is suspected that some center were lost going in due to this constraint Tested run valve control (worked out some bugs and now works very well): still needs higher torque motor with clutch added Tested automated microwave control system: seems to be working quite well Tested flow monitor system and pressure release system: flow and systems monitor working, pressure release is unreliable for the level of possible danger, need simple fail safe check valve (essential component for backfill regulation) Separator flow control only preliminary tested (further tests do not need cooldown) NH vi was updated but still operation lead to a magnet quench, its been updated and the power supply has been taken to NH for further testing during an upcoming NH magnet cooldown -- We have had to rewrite most of the LANL VIs to work with the proper target handler scheme for cyrocontrols-- The cryocontrols still needs work and testing for robustness and patching into an asynchronous flow: If this can not be done without system hangs we will need to have separate machines for NMR and Microwaves Seeing about 14 SLM (~ 1W) when turning on microwaves but this is not seen in the polarization rates as it takes about 30 mins to get to ~80% The power issue maybe due to the square connector in the horn and the need for a circular to v-band connector. There maybe a power issue beyond this but lets hope not running two tube as the same time will not be easy. Horn is also deforming (bowing out) due to rapid pressure increase during loading, so far only solution is loading slowly and bending it back into shape as needed Generated field map with hall probe at 4 different angle with respect to the beamline (field flips sign near top of coils) Jan 23 - Jan 25 Have witness field drifts a couple of time. One drift recorded was from 74.55A (setpoint) to 74.53A (witness) after moving the leads to 74.53A the heater was able to come on without issue. Studied LHe boil off: When magnet is full boil off is 17 SLM and vacuum can be as good as 7X10^-7 torr (best seen so far with this system) When magnet is lower the boil off is 7 SLM with a vacuum pressure around 1.6X10^-6 torr Check field map along beamline for turbo positioning (dies off around 11'-12') Other comments: The target insert did not have any challenges going in or out this time, there is very little room for NMR connections around the perimeter and a couple of times NMR coils were disconnect going in. I also believe at least one of the fridge sensors got hung up on the insert and was disconnects. Over all this system runs very smoothly if it is tended to correctly. There is still lots and lots of work that needs to be done. Some of which is hardware, some of which is making everything more fluid and functional for the experimental setting, and some of which is interface. We also need to come to a conclusion about what NMR warm/cold for what set of cups out of the 4 possible positions. I will do what I can to make everything as interchangeable as possible so we are not fixed to any one configuration for the insert, But it is still suggested that we have two cells with cold NMR so the ND3 can move around without having to make renovation on the fly. There is no possibility of having more that 15 NMR run through the top and 12 is already cumbersome, so I am suggesting we stick with 12 on both inserts. Hopefully the NMR can be setup to switch easily between proton and deuteron and we have at least two active cells which can work with either and one dummy. It might be best to just start with three cells (one empty) so there is space to try a microwave reflector.