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Addressing Concerns About Running with a Large Wien Angle for G0 Experiment in Hall C

There are concerns regarding operating with a large Wien angle of approximately 90 degrees for G0 in mid-March, as all three halls will be in operation. Given Hall C's requirement of 687 MeV at a single pass and precession angles, this 90-degree Wien angle may pose challenges. Despite historical instances of running physics with similar settings, questions remain about the implementation of solenoid magnetic fields and the relationship between G0 forward and backward runs. Various past experiences indicate that while it is not ideal, it may still be feasible.

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Addressing Concerns About Running with a Large Wien Angle for G0 Experiment in Hall C

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  1. There is concern about running with a large Wien angle. The anticipated Wien angle for G0 in mid-March is about 90 degrees. All 3 halls will be running. Question: What can be done? Answer: Nothing, here’s why? Forget for a moment about Hall’s A & B. Hall C needs 687 MeV at one pass, or 37 + 325 + 325. Precession between source & Hall C turns out to be about 89 degrees. What about “linac trick”, i.e., ~37 + (325 + D) + (325 - D) ? Precession between source & Hall C is then 89 deg + (0.43 deg/MeV ∙ D [MeV]) So, roughly it’s about 1.5 degree per percent linac energy change…..or, about nothing.

  2. Next, question… • Will G0 forward be a guiding light for G0 backward? • Well, probably not…Wien was -13 degrees & we had the “high bunch charge injector”. • Have we run physics with Wien at 90 degrees previously? • Well, yes, when we have delivered vertical polarization (Wien=90 + Solenoids=90) • Usual goal => change solenoid spin (∫B∙dL), constant solenoid focussing (∫ B2∙dL). • So, when have we done that? • March 22, 2004 (Archiver => “Yikes”, Allsave 4239 @+85 & 4240 @-94) • July 15, 2004 (Archiver => “Yikes”, Wien = +91) • August 29, 2005 (Archiver => OK, Wien = +90)

  3. August 29, 2005 3 Halls Wien=+90.24 deg A=40 uA B=12 nA C=10-20 uA

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