[A1n_d2n] To do items from today's meeting

[Brad Sawatzky]

On Thu, 17 May 2018, Xiaochao Zheng wrote:

> 1) optics:
> 
> So  we need 20 PAC hours with 1-pass beam for an extensive optics
> study in the fall 2019 run.

We need ~20 PAC hours of 1-pass beam for a list of calibration items.
The optics part is important, but it won't dominate that time though:
  Optics                                              [2 PAC hours]
  H(e,e'p) elastics, C, 3He elastic, QE, Delta, etc  [15 PAC hours]
  BCM, BPM calibrations                               [2 PAC hours]

> What about Spring 2020?  We will need to take elastic and Delta with
> 1-pass beam again. Can we do a reduced optics study with 1-pass for
> that run period?

I think we should still request at least 36 calendar hours in the
Spring.  For example, setup 1-pass on 'Monday afternoon' start running
during swing, switch back Wednesday morning.

> 3) target protection:
> 
> the empty target position now has +/-0.522" or +/-1.325cm of space
> both above and below. This is the full distance to the solid target
> holder and to the reference cell wall.  Sounds like a 2.5cm OD Al tube
> is too big to fit in.  Jianping probably can comment on this.

The wall thickness of the Al tube isn't too critical, so 2.2cm OD and
2.0cm ID would be fine too.  That is snug, but it fits.  I imagine it is
also possible to lower the relative position of the reference cell a bit
and increase the gap(?)

As you say, JP knows what can be done.

-- Brad