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We discussed the current status of the machine setup. It is currently going well, we were in ARC6 as this meeting took place. The M56 tests took place last sunday and yielded the interesting result that the existing model is still the best so far. Lower body
gradient optics (75 and 52 % ) both produced bigger corrections, increasing as the body gradient was lowered. This would suggest that the actual value is maybe 110 % of what we have. We moved on keeping the design ARC1. </div>
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The matching of ARC1 should include preserving the phase relationship between the S08, E01 kickers and arc lattice for FOPT/qSnyder to work correctly and avoid amplifying/damping the S08 kick. <span style="color: rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;">To
that effect, we are going to remove s08, s09 and s10 from the matching template. I will review the optics and set the fodo channel s08,s09,s10 to get 90 degrees between S08 and E01.</span></div>
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A discussion on the concept of edge-emittance matching (like they did in the FEL) where one uses viewer images to match to a bigger envelope accounting for unseen halo by regular harps. Kevin remarked that the FEL viewers were instrumented with Al flags and
were essentially OTRs. This is something that could be considered in the CEBAF injector.</div>
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Mike Tiefenback pointed out that if one uses a low enough current (or/and viewer limited pulse width) one can get to the point the chromox viewer flags do not produce bloom. The camera saturation is a separate issue. He is proposing to write a testplan to check
this for several viewers and come up with a way to use them that way. <span style="font-family: Calibri, Arial, Helvetica, sans-serif;">We would be able to match using these and assess the quality of the machine setups in the arcs using the viewers at homologous
points.</span></div>
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This raised the other topic of what to write in the ORFP for a good criterion on deciding whether or not an arc is properly matched. Just looking at the harp size at E01 is not enough since it does not capture the divergence of the beam. Also, qsUtility design
size is sqrt(beta*designemittance). If we have picked up emittance along the way then that size is not longer what we are aiming for. Remember, the matching process adapts the lattice transport to the shape of the beam by manipulating quads to change beta
and alpha. It does not match a specific beam size.</div>
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As far as Injector matching, I suggested we could try matching with several sigmas (instead of the one sigma match we do now) to see if one improves transmission .</div>
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Finally we discussed when one can expect the setup to conclude. Baring any disaster we think we should be able to lock up the halls by friday evening. Hall C may be locked up thursday evening.</div>
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We discussed the possibility of sending CW to Hall C dump friday before finishing the setup to assess the CW quality of the machine and whether or not we still have losses. The incoming PD (Jay) will coordinate with the halls so that they dont ask for lockup
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