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Edits to this section should be in paper_src/injection.md, discussion belongs here.

In the paragraph before equation (6), there is a sentence which says that "Therefore, the number of turns N_turns is limited by the selected 10cm horizontal apertures x_max of the bending magnets"
I believe 10cm is the aperture of the quads, and it is the quads, not the dipoles, that limit the number of turns.

I wonder if equation 6 is erroneous. From

where delta_E is the energy loss per turn, and N*delta_E denotes the max. allowed energy loss. This divided by the total E should equal the max. allowed dispersive shift divided by the dispersion function.
Hence the modified equation would be of the form:

In Table 3, I believe the bending radius and dispersion function of the 1 GeV s.c. case should be 0.33m rather than 0.83m

In the last sentence of the first paragraph in Discussion, it mentions a beam size of sigma_r = 5 micron. I am not sure I understand this correctly, because, according to Table 3, the beam size is at least 500 micron when the electron beam is circling the ring.

Edits to this section should be in paper_src/introduction.md, discussion belongs here.

With a revolution time of ~ 40 ns, it is likely the plasma will not have fully dissipated after one turn. We discussed some options with Aakash:

• Clearing electrodes
• Gas jet parameters?

Aakash should also be on this issue when he is a collaborator

Please find below a preliminary optics design of the compact light source with parameters as follows:

Starting from the middle of the wiggler, the sequence of elements are: d4, bend, d3, bend, d2, q2, d1, q1, d0, d0, q1, d1, q2, d2, bend, d3, bend, d4

bend: sector bend, edge angle = 22.6 degrees (0.395 rad) on both ends (+ve means defocusing/focusing effect in x/y respectively)
d0: drift, l=0.4;
d1: drift, l=0.1;
d2: drift, l=0.1;
d3: drift, l=0.5;
d4: drift, l=1.0;
q1: quadrupole, l=0.2, k1=1.9324;
q2: quadrupole, l=0.2, k1:=-4.55564;

A reflection symmetry about the middle of the upper straight drift has been exploited to simplify the design. This deviates slightly from the schematics as the two quadrupole doublets are no longer both FD but rather DF downstream of B4 and FD upstream of B1.

The dispersion function is zero throughout the wiggler, which should greatly enhance the brightness of the radiation. However, further optimization remains to be done because the dispersion is rather large at the quads which would reduce the possible number of turns.

Edits to this section should be in paper_src/lattice_and_magnets.md, discussion belongs here.

Tasks

• SVG or CAD figure of machine
• Edge focusing calculations
• MAD-X (or etc.) lattice file

Hi everybody,
I sent out an email earlier today with the first draft of the USPAS paper.
If you read it, you will find many things we should discuss here. Let me start:

Things that are missing:

• Information of the size of the system (cirumference, magnet lengths, drift space length, bending radius)
• Information about the electron energy loss per turn, and how we will dump them.
• Didn't we want to put some optics calculations?
• periodic length of the wiggler magnet structure
• Drawing: adding the focusing doublet, maybe a box for the wiggler, and the laser system
• Discussion: challenge of the optics
• Injector: I think we have to mention the radial beam size and the divergence that we assume because we base the focusing doublet design on it
• Discussion: Future work
• Discussion: Using the synchrotron radiation of the bends, betatron radiation of plasma

I uploaded the latex file based on the NAPAC template (whole_latex) to the paper_src folder. in order to compile it you also have to download the template (jacow.cls) from this website http://jacow.org/index.php?n=Authors.LaTeX

what do you think?

Edits to this section should be in paper_src/wiggler_and_radiation.md, discussion belongs here.

Edits to this section should be in paper_src/discussion.md, discussion belongs here.