14 mrad Extraction Line Optics for Push-Pull Page: 3 of 6
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SDO, QDEX1 are inside the detector area, in order to facilitate a rapid push-pull exchange,
each detector will have its own set of these magnets integrated into the detector cryostat.
Consequently, the parameters of QDO, SDO, QDEX1 are optimized for each detector. For
a uniform optics, the magnets outside of the detector will not change with L*, except for
field adjustment. The second set of SC magnets QF1, SF1, QFEX2A will be housed in a
separate cryostat outside of the detector. The 2 3 m warm space between the 1st and 2nd
cryostats, as shown in Fig. 1, will provide a breakpoint for detector detachment from the
beamline. After the Final Doublet, there is a dedicated free space in the extraction line to
accommodate the large size incoming crab-cavity.The complete extraction optics
and lattice functions are shown in
Fig. 2, based on the earlier de-
sign in [3]. The SC and warm
quadrupoles provide focusing to
the 2nd focal point at s 148.6 m
with R22 -0.5 required for the
polarization diagnostics. After the
quadrupoles, there are two vertical
bending chicanes: for energy and
polarization measurements [4] and
gamma calorimeter (GamCal) [5].
The 6-bend polarimeter chicane isGAMCAL
Energy Polarimeter Kickers
IP 'Eir r ii: i'225
2000
1]5Figure 2: Extraction lattice functions.
adjusted for 50% higher field in the 3rd and 4th bends for improved acceptance of Compton
backscattered electrons in the Cherenkov detector, while the 5th and 6th bends close the
trajectory bump and provide space and bending for GamCal.
The chicanes are followed by a system of 5 vertical Undisrupted bunches at dump
and 5 horizontal fast cycling kickers. They will protect a
the dump window from damage and prevent water boil- '- "'
ing in the tank in situations with a very small beam size
such as in cases of an undisrupted beam or accidental fo-
cusing at dump. The kicker field will oscillate with ~1
kHz frequency to sweep the bunches in 1 ms train on 3
cm circle at the dump as shown in Fig. 3, thus reducing
the beam density to acceptable level [6]. Finally, a sys-
tem of 5 collimators is included: to clip off the disrupted
low energy tail, to protect the extraction magnets and Figure 3: Swept bunches at
diagnostic devices from high beam loss and synchrotron dump.
radiation, and to limit the beam size at dump to within
the 15 cm radius of the dump window. The dump is located ~300 m from the IP and > 3.5
m from the incoming line. The parameters of extraction magnets at 500 GeV CM are listed
in Tables 1,2. The extraction magnets are compatible with 1 TeV CM energy, except the
SC quads QDEX1, QFEX2A which require upgrade.
3 Detector solenoid
The detector solenoid field downstream of IP creates vertical orbit, dispersion, coupling and
focusing in the extraction line. The orbit and dispersion are created due to the 7 mradLOWS /ILC 2007
- Dump
R functions and vertical dispersion
CIPo a
oeo
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Nosochkov, Y.; Moffeit, K.; Seryi, A.; Morse, W. & Parker, B. 14 mrad Extraction Line Optics for Push-Pull, article, October 15, 2007; Menlo Park, California. (https://digital.library.unt.edu/ark:/67531/metadc881501/m1/3/: accessed April 18, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.