A doublet C0 IR solution using existing magnets Page: 1 of 13
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FERMILAB-TM-2181 August 2002
- 110lb 8/01/02
A DOUBLET CO IR SOLUTION USING EXISTING MAGNETS
JOHN A. JOHNSTONE
Fermilab, Batavia, IL 60510-0500
This note explores, in a very limited way, some of the possibilities & difficulties encountered in
creating collisions at CO solely using magnets looted from the existing IR's at BO & DO. In the
strawman model considered here a standard Collins straight section is installed at DO, while all the
useful DO IR magnets are moved to CO. There is no obvious reason from either an optics or beam-
separation viewpoint to prefer the demise of DO over CDF, or vice-versa, so the model choice is
fairly arbitrary. Apart from modifications to the final-focus optics, the magnets appear at CO
locations just as they are currently installed at DO.
The magnet layout and power circuits of the model CO IR are illustrated in Figure 1, with the
bizarre Tevatron magnet numbering scheme of the CDF/DO IR's being retained. In Run II CDF &
DO use 4 additional trim quads to those indicated below. These are independently-powered regular
tune-quad spools which, in the picture below, would correspond to QT8's at the B45/C15
locations, and QTB & QTA spools at the B39 & B42 sites. Since in the CO colliding mode
envisioned here CDF doesn't experience collisions concurrently with CO, the additional fine-tuning
provided by 4 more trims is unwarranted.
QT9 Q9 T QT7 -QQT7 Q T9 QTO
20 IE LU. LL
S100 200 200 400
Path Lcngtb (in)
Figure 1. Series & independently-powered circuits of the CO Interaction Region.
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Johnstone, John A. A doublet C0 IR solution using existing magnets, report, August 19, 2002; Batavia, Illinois. (https://digital.library.unt.edu/ark:/67531/metadc734632/m1/1/: accessed March 21, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.