[Hallc_running] [EXTERNAL] Re: [Revised Logentry] RC Daily Update
Brad Sawatzky
brads at jlab.org
Thu Aug 27 16:25:24 EDT 2020
Hi Xiaochao,
The reference cell was filled with He3. The He3 was not purged after
the fill. The phrasing is just a little confusing.
-- Brad
On Thu, 27 Aug 2020, Xiaochao Zheng wrote:
> Hi Burcu:
> Thanks for the report. I just want to point out two things that I noticed
> when reading the report:
>
> By 1:30am, the reference cell was filled with PolHe3
> ([1]https://logbooks.jlab.org/entry/3835347).
>
> While we were getting ready for an access and during the escorted access, TO
> evacuated the reference cell
>
> 1) the ref cell has to be fileld with regular He3 gas, not PolHe3.
> 2) Do I read correctly that we purged the 3He gas only an hour after filling
> the ref cell? Was it an accident or intentional?
> Thanks,
> Xiaochao
>
> ----------------------------------------------------------------------------
>
> From: Hallc_running <hallc_running-bounces at jlab.org> on behalf of
> bduran at jlab.org <bduran at jlab.org>
> Sent: Thursday, August 27, 2020 12:20 PM
> To: hallc_running at jlab.org <hallc_running at jlab.org>
> Subject: [Hallc_running] [Revised Logentry] RC Daily Update
>
>
> [2]RC Daily Update
>
> o [3]Edit
> o [4]Delete
>
> Lognumber [5]3835654. Submitted by [6]bduran on [7]Thu, 08/27/2020 - 11:52.
>
> Last updated on Thu, 08/27/2020 - 12:18
>
> Logbooks: [8]HCLOG
> Entry Makers: bduran
>
> Yesterday at the beginning of the swing shift, MCC had to work a bit on
> tuning the beam for us and did harp scans. Following that we resumed
> production running with PolHe3 longitudinal and we took data until 6pm when
> Brad came in to test new (correct) beam positions for glass cells
> ([9]https://logbooks.jlab.org/entry/3835151). While he was testing the new
> beam positions, we had an interlock on HMS Q2 on LHe level (~30%). Heidi
> stopped by the CH and informed us the problem is corrected and asked us to
> wait the LHe levels reach 35-40% to ramp the magnet up. At 8:04pm, the
> magnet was up again ([10]https://logbooks.jlab.org/entry/3835190). During
> the new beam positions testing (we use 5 uA CW or tune), MCC was struggling
> to send us beam and they reported the Compton ion chamber was acting up in a
> way similar to the transport ion chamber (they're reading higher signals
> with no beam or lower currents).
>
> We wrapped up the production running with PolHe3 longitudinal by owl shift
> yesterday. The last NMR measurement @8:28 pm : 44.1% (
> [11]https://logbooks.jlab.org/entry/3835209) and PNMR: 44.3%
> ([12]https://logbooks.jlab.org/entry/3835225)
>
> At 12:30am we took an escorted access to purge and fill the reference cell
> with He3. This was needed to carry out taking data with reference cell He3
> while the target experts prepare the PolHe3 target for transverse running.
> By 1:30am, the reference cell was filled with PolHe3
> ([13]https://logbooks.jlab.org/entry/3835347).
>
> While we were getting ready for an access and during the escorted access, TO
> evacuated the reference cell and started the AFP loss and temperature tests
> that were needed to be complete before rotating the PolHe3 to transverse. At
> 2:30am, the tests were done ([14]https://logbooks.jlab.org/entry/3835396),
> target lasers are switched to transverse direction
> ([15]https://logbooks.jlab.org/entry/3835377) and the target spin direction
> was rotated to 270 degrees ([16]https://logbooks.jlab.org/entry/3835381).
> Around 2:30am we had about half an hour down time due to hall C dipole
> magnet MBSY3C string tripped off
> ([17]https://logbooks.jlab.org/entry/3835410). Following that, we took
> production data with reference cell (He3) until 06:43am when Mingyu/Junhao
> began the EPR/NMR calibration procedure. At 08:24am we resumed data taking
> with the reference cell (He3).
>
> Since 10:55am, we have been down for an escorted access to complete the
> following tasks:
>
> 1) Troubleshooting the transport ion chamber issue
> ([18]https://logbooks.jlab.org/entry/3835254), Jerry Kowal's team is taking
> care of this. (ongoing)
>
> 2) Reset rotation drive controllers (Joe Beaufait) (done)
>
> 3) Connecting the spare air compressor that Walter rented.
> ([19]https://logbooks.jlab.org/entry/3833255) (Larry et al) (done)
>
> 4) Tweaking the EPR RF amplifier gain setting to troubleshoot the noisy NMR
> ([20]https://logbooks.jlab.org/entry/3835639) (done)
>
> 5) Check air flow/fan in laser box ? (Brad)
>
> We expect to be down about ~ 2hours.
>
> We will have an RC Meeting at 4:15 pm
>
> Bluejeans remote connection information:
> To join the Meeting:
> [21]https://urldefense.proofpoint.com/v2/url?u=https-3A__bluejeans.com_861439920&d=DwIBAg&c=CJqEzB1piLOyyvZjb8YUQw&r=u5tNM-t17TvnEMN44CWm5qVyE415lk08NPqyR_N_lLM&m=li3Tb5wT0v_YCplQrA_4qNr9RU64XNA7Gm2-kzjWtEM&s=H5OOLJGJIsIqPTj5inBZJYdIbrM6cMCkKy4sflARUgo&e=
> To join via Room System:
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> References
>
> Visible links
> 1. https://logbooks.jlab.org/entry/3835347
> 2. https://logbooks.jlab.org/entry/3835654
> 3. https://logbooks.jlab.org/entry/3835654/edit?destination=email/send
> 4. https://logbooks.jlab.org/entry/3835654/delete?destination=email/send
> 5. https://logbooks.jlab.org/entry/3835654
> 6. https://logbooks.jlab.org/user/bduran
> 7. https://logbooks.jlab.org/entries?start_date=1598539945&end_date=1598547145&book=HCLOG
> 8. https://logbooks.jlab.org/book/hclog
> 9. https://logbooks.jlab.org/entry/3835151
> 10. https://logbooks.jlab.org/entry/3835190
> 11. https://logbooks.jlab.org/entry/3835209
> 12. https://logbooks.jlab.org/entry/3835225
> 13. https://logbooks.jlab.org/entry/3835347
> 14. https://logbooks.jlab.org/entry/3835396
> 15. https://logbooks.jlab.org/entry/3835377
> 16. https://logbooks.jlab.org/entry/3835381
> 17. https://logbooks.jlab.org/entry/3835410
> 18. https://logbooks.jlab.org/entry/3835254
> 19. https://logbooks.jlab.org/entry/3833255
> 20. https://logbooks.jlab.org/entry/3835639
> 21. https://urldefense.proofpoint.com/v2/url?u=https-3A__bluejeans.com_861439920&d=DwIBAg&c=CJqEzB1piLOyyvZjb8YUQw&r=u5tNM-t17TvnEMN44CWm5qVyE415lk08NPqyR_N_lLM&m=li3Tb5wT0v_YCplQrA_4qNr9RU64XNA7Gm2-kzjWtEM&s=H5OOLJGJIsIqPTj5inBZJYdIbrM6cMCkKy4sflARUgo&e=
> 22. https://urldefense.proofpoint.com/v2/url?u=http-3A__bluejeans.com_numbers&d=DwIBAg&c=CJqEzB1piLOyyvZjb8YUQw&r=u5tNM-t17TvnEMN44CWm5qVyE415lk08NPqyR_N_lLM&m=li3Tb5wT0v_YCplQrA_4qNr9RU64XNA7Gm2-kzjWtEM&s=-fevmiDjqo8HwA9-iApi30xsL1Km6lFB0vZRPLkyBC4&e=
--
Brad Sawatzky, PhD <brads at jlab.org> -<>- Jefferson Lab / Hall C / C111
Ph: 757-269-5947 -<>- Fax: 757-269-5235 -<>- Pager: brads-page at jlab.org
The most exciting phrase to hear in science, the one that heralds new
discoveries, is not "Eureka!" but "That's funny..." -- Isaac Asimov
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