[A1n_d2n] (not your usual) call for shifts for A1n/d2n

[Xiaochao Zheng]

Dear all spin physics supporters:

As many of you may have heard from yesterday's Hall C Collaboration meeting, the A1n experiment is now running in Hall C, and will be followed by the d2n experiment.  We have completed the 1-pass calibration and have reached a 3.4% precision on elastic 3He asymmetry (for PbPt calibration). We are now in full production mode in Hall C.  However, we still need shift workers to fill up the many empty slots on the schedule, please see:

https://misportal.jlab.org/mis/physics/shiftSchedule/?experimentRunId=HALLC-POL3HE

Please consider signing up for some shits. If you can't, please ask your postdocs and graduate students to take some so we know we still have your support in A1n.

As for all high x experiments, our shifts are quiet with hour-long runs, rates are so low that we have to use a pulser to allow accurate helicity decoding. Our online replay can be viewed in a browser live, from which you can watch the yield beautifully building up from virtual photon scattering off quarks in the high x (0.5-1.0) range.  Offline full-run replays are launched automatically with N+ - N- results posted on hclog, make you wonder what the sign of the down quark polarization is at high x.

If nothing crashes, you can get a lot of work done during shifts such as reading papers, grading exams, writing recommendation letters, walking over to Hall A and chat with friends or take a look at their half-$M Ca48 target, or just do leisure reading of any topic of your choice (whether it is quantum computing or New York Times, we don't have rules on what you read as long as you watch the data once in a while. But do bring a laptop, as you can't access those from shift computers).

If you sign up as SL, you can even delegate some tasks, such as shift checklist, to the TO. On the other hand, if you sign up as TO, you have even less to do than the SL because the TO does 1-2 NMRs per shift and that's about it, and you will have a chance to be amazed by our occasional 60%+ target polarizations (in fact it reached 70% without beam two days ago).

If you choose to doze off, that's fine too. Our alarms are rare and when they go off, most of time it's on charge asymmetry which means you only need to walk to Hall A to remind them that their parity DAQ should be started (it's Hall A folks who kindly keep our charge asymmetry low, so please be kind).

In summary, Counting House C is now an ideal destination for spring break, non-teaching weekdays, long weekends, a nice Sunday stroll, or if you need a place to grade your midterms quietly.  And I hope to see you in the counting house soon.

Sincerely,

(not your usual spokesperson)
Xiaochao

PS if you already took shifts during our chaotic target commissioning time, the atmosphere in the counting house has truly changed, as described above. So please do come back and see our changes soon!
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