Muon collider ring cooler Page: 3 of 6
This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided to Digital Library by the UNT Libraries Government Documents Department.
The following text was automatically extracted from the image on this page using optical character recognition software:
SCHEMATIC AND PARAMETERS OF THE COOLER
A schematic of the cooler is shown in Fig. 2. It includes two bending sections with
wedge absorbers and two straight sections which house RF cavities and the main
absorbers-assumed here to be beryllium (Fig. 3). Each bending section includes
magnets with field index 0.5 for focusing and bending the beam. Betatron phase
advances are 3600 to get independent variation of coordinates and angles (which is
why turns in two planes are used). Skew quadrupoles are placed on the edges and
center of the bending section to suppress dispersion in the straight sections.
Each straight section includes three FODO cells with phase advance of 60 for
X and 1200 for Y in the leading part of the section, and two 90 FODO cells in the
trailing part. This gives betatron transfer matrices M ,y = tv x D per half-turn,
and M ,y = A x D per turn, as desired. With an appropriate choice of length for the
straight section, revolution frequency becomes independent of energy. Bunchers are
installed to provide energy-time coupling so that the longitudinal transfer matrix
is also of A x D type. Some parameters of the cooler are listed in Table 1.
TABLE 1. Parameters of the Cooler
Muon energy (y): min, center, max 1.5 - 1.647 - 1.875
Circumference 19.51 m
Revolution frequency 12.13 MHz
Bending radius 0.458 m
Length of straight sections 5.687 m
Energy rate in SS 7.0 MeV/m
Length of main absorber (Be) 11.2 cm
Angle of the wedge absorber 5.8 deg
FIGURE 2. Schematic of the ring cooler.
SKEW QUAD SKEW QUAD+WEDGE SKEW QUAD
Angle165 deg 90 deg 90 deg 165 deg F D F D F D F+ bs D F D F
VER.BEND HOR.B HOR.B VER,BEND B A A A A B
PHASE ADVANCE 180 deg PHASE ADVANCE 180 deg 3 FODO cells: 60 deg X, 120 deg Y 2 FODO 90 deg cells
FIGURE 3. Bending and straight sections of ring cooler (F,D-quads,A,B-accelerating cavities
Here’s what’s next.
This article can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Article.
Balbekov, V.I. & Van Ginneken, A. Muon collider ring cooler, article, March 1, 1998; Batavia, Illinois. (https://digital.library.unt.edu/ark:/67531/metadc703903/m1/3/: accessed April 26, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.