Course Aperture Study For The Window Frame Dipoles In RHIC Page: 3 of 4
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this physical barrier is made:too :large (1000 mm),. we will have;information
about the dynamical .stability of 'the beam, i.e. the dynamicalzaperture.
We chose in PATRICIA a reference emittance of E0 . . Ti X Ico 4-ra.
in terms of, its-unitsemittance is controlled by a parameter A in the way
= to l
Changing A we can see the number of turns :a particle cangive in the ring.
1.- Dynamical Aperture of Dipoles.
We will present results in the same way -as in.i).
A has the same meaning as before.
B is the number of turns the particle will"give if its amplitude does not.
exceed the aperture given.
C is the number of turns the particlegives in the ring.
D=beam size=(x2+y2. .With E - 7 ) [
At the end of dipoles N S Z.4-
Table I.- Dipoles with;no multipoles have larger dynamical aperture that
shown (taken-from reference 1)
Table II.- Dipoles with Window Frame multipoles. Dynamical aperture.
Last table shows that at 4.e-O the dynamical aperture of.-WFD is rJ 20 mm:bigger
than the corresponding DRD aperture.
2.- Physical Aperture of Dipoles.
To determine:how stable is the.beam:near the operation.emittance, a physi-
( A(B) D (mm)
+0.2 : 80' (100) >41.0
0.0: 115 (100) >59.0
-0.2 80 (100) '/41.0
P (%) A(B), A(C) D (mm)
+0.2 99(100),; 101(62) 50.86 D 651.8.
0.0 109(100), 111(93). 56.0 D'56.9
-0.2 107(100):, 109(100) 54.9 .D $56.0
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Antillon, A. Course Aperture Study For The Window Frame Dipoles In RHIC, report, June 22, 1984; United States. (digital.library.unt.edu/ark:/67531/metadc872764/m1/3/: accessed September 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.