atf2 layout/optics (v3.5)

July 1, 2006 M. Woodley [SLAC] 1

ATF2 Layout/Optics (v3.5)

nBPM (SLAC)nBPM (KEK)

FONT

Compton / laserwire

ODR

Existing ATF Extraction Line

Coupling Correction /Emittance Diagnostics


selected at the ATF2 Optics Video Meeting of April 20, 2006


• weak quadrupole at center of EXT inflector removed

• 2 additional sextupoles added to EXT for vertical chromaticity correction

• 4 stripline BPMs in EXT emittance measurement section replaced with QBPMs

• space between B5 and QD6 increased

• all FF sextupoles changed from 200 mm length to 90 mm length

• and …

Version 3.5 Changes


• offset between north DR straight and skew correction / diagnostic section = 6.0 m

• west Assembly Hall wall to IP = 13.5 m

• west Assembly Hall wall to center of dump bend = 11.3 m (Lbend = 1.35 m)

• west Assembly Hall wall to exit face of dump = 7.4 m (Ldump = 2.3 m)


BH2

BH1

BH1

K1

K2

• BH1 (SHI “H”) strengths same as existing EXT• BH2 (SHI “C”) has 110% of present strength

6.0 m


-1 0 0 0

-0.73 -1 0 0

0 0 2.35 -1.76

0 0 -1.94 1.87

R

K1(+) K2(+)

possible location for1 μm laserwire


2.7 1.25 1.25 1.25 3.8 3.8 3.80.8 0.8 1.25 2.20.5 0.8 0.8

SQ SQ SQ SQ WS WS WS WS WS

90°90°

180°90°

90°90°

– x– y

11°17°

28°28°

42°42°

28°28°

80.610.0

154.66.8

86.312.1

152.36.8

87.411.7σ (μm)

8 < σx/σy < 23

shieldwall


2nd order dispersion


chromaticity (EXT)


beam size (μm)

Parameters

energy = 1.3 GeVγεx = 5×10-6 mεx = 2×10-9 mγεy = 3×10-8 mεy = 1×10-11 mσz = 8 mmσδ = 0.08 %βx* = 4 mm

βy* = 0.1 mmσx* = 2.828 μmσy* = 34 nm


TABLE 1: existing ATF EXT quadrupoles------------------------------------------------------------------------------power supply maximum currents from N. Terunuma email (April 22, 2005)------------------------------------------------------------------------------a note on names: the "quad name" column names the location in the beam line;the "magnet name" column names the physical magnet that presently resides ateach location; the "power supply" column names the power supply whose cablescome to that location------------------------------------------------------------------------------quad magnet magnet power Imax KLmax notesname name type supply p.s. @ 1.3 GeV----- ------- ----------- ------ ---- --------- ------------------------QD1X QD1Xmag Hitachi 2 QD1Xps 100 0.6657QD2X QD2Xmag Hitachi 2 QD2Xps 100 0.6657QF1X QF1Xmag Hitachi 2 QF1Xps 100 0.6657QK0X QK0Xmag ECUBE skew QK0Xps 20 2.7673e-4QS1X QS1Xmag ECUBE skew QS1Xps 20 2.7673e-4QF2X QF2Xmag Hitachi 1 QF2Xps 100 0.2989QD3X QD3Xmag Hitachi 5 QD3Xps 100 2.1050QF3X QF3Xmag Hitachi 5 QF3Xps 100 2.1050QF4X QF4Xmag Hitachi 5 QF4Xps 100 2.1050QS2X QS2Xmag ECUBE skew QS2Xps 20 2.7673e-4QD4X QD4Xmag Hitachi 5 QD4Xps 200 2.1050 use Imax = 100 ampsQD5X QD5Xmag Hitachi 5 QD5Xps 100 2.1050BH4X .......................................................................QF5X QF5Xmag Hitachi 5 QF5Xps 100 2.1050QK1X QK1Xmag IDX skew QK1Xps 5 2.5363e-2QD6X QD6Xmag Tokin 3393 QD6Xps 100 0.3021QK2X QK2Xmag IDX skew QK2Xps 5 2.5363e-2QD7X QD7Xmag Hitachi 5 QD7Xps 100 2.1050QK3X QK3Xmag IDX skew QK3Xps 5 2.5363e-2QF6X QF6Xmag Hitachi 5 QF6Xps 100 2.1050QK4X QK4Xmag IDX skew QK4Xps 5 2.5363e-2QD8X QD8Xmag Hitachi 4 QD8Xps 200 2.0650QF7X QF7Xmag Hitachi 4 QF7Xps 100 1.0488QD9X QD9Xmag Hitachi 4 ------ --- 2.0650 in series with QD8X

magnetic measurements data file Imax------------------------------- -----ATF$MAG:MAG_KI_Q_HITACHI_1.FOR 140.2ATF$MAG:MAG_KI_Q_HITACHI_2.FOR 100.2ATF$MAG:MAG_KI_Q_HITACHI_4.FOR 200.4ATF$MAG:MAG_KI_Q_HITACHI_5.FOR 100.6ATF$MAG:MAG_KI_Q_TOKIN_3393.FOR 139.0ATF$MAG:MAG_KI_Q_IDX_SKEW.FOR 20.0ATF$MAG:MAG_KI_Q_ECUBE_SKEW 20.0


TABLE 2: ATF2 EXT quadrupoles ("optimal 2")------------------------------------------------------------------------------quad magnet magnet power Imax KLmax KL NOTEsname name type supply p.s. (see below)----- ------- ---------- ------ ---- --------- ------- ----------------QD1X QD6Xmag Tokin 3393 QD1Xps 100 0.3021 -0.2500 2QD2X QD2Xmag Hitachi 2 QD2Xps 100 0.6657 -0.2529QF1X QF1Xmag Hitachi 2 QF1Xps 100 0.6657 0.3554QK0X QK0Xmag ECUBE skew QK0Xps 20 2.7673e-4 0.0QS1X QS1Xmag ECUBE skew QS1Xps 20 2.7673e-4 0.0QF2X QF2Xmag Hitachi 1 QF2Xps 100 0.2989 0.2122QD3X QD3Xmag Hitachi 5 QD3Xps 100 2.1050 -0.5507QF3X QF3Xmag Hitachi 5 QF3Xps 100 2.1050 0.3238QMX QF5Xmag Hitachi 5 QF5Xps 100 2.1050 0.7293 3QF4X ------- IHEP ------ 100 2.5 2.0628 1,4QS2X QS2Xmag ECUBE skew QS2Xps 20 2.7673e-4 0.0QD4X QD4Xmag Hitachi 5 QF7Xps 100 2.1050 -1.3399 5QF5X QD5Xmag Hitachi 5 QD5Xps 100 2.1050 0.6193BH4X .......................................................................QD5X QD1Xmag Hitachi 2 QD6Xps 100 0.6657 -0.3528 2QK1X QK1Xmag IDX skew QK1Xps 5 2.5363e-2 0.0QD6X QD7Xmag Hitachi 5 QD7Xps 100 2.1050 -1.2504QF6X QF6Xmag Hitachi 5 QF6Xps 100 2.1050 1.2504QK2X QK2Xmag IDX skew QK2Xps 5 2.5363e-2 0.0QD7X QF4Xmag Hitachi 5 QF4Xps 100 2.1050 -1.2504QF7X QD8Xmag Hitachi 4 QD8Xps 200 2.0650 1.6706 6QD8X QF7Xmag Hitachi 4 QD4Xps 200 2.0650 -1.2478 5QF8X QD9Xmag Hitachi 4 ------ 200 2.0650 1.6706 6QK3X QK3Xmag IDX skew QK3Xps 5 2.5363e-2 0.0QD9X ------- IHEP ------ 100 2.5 -1.2504 1QF9X ------- IHEP ------ 100 2.5 1.2504 1QK4X QK4Xmag IDX skew QK4Xps 5 2.5363e-2 0.0QD10X ------- IHEP ------ 100 2.5 -0.8436 1QF10X ------- IHEP ------ 100 2.5 0.8106 1QD11X ------- IHEP ------ 100 2.5 -0.3753 1QF11X ------- IHEP ------ 100 2.5 0.3753 1QD12X ------- IHEP ------ 100 2.5 -0.3753 1

note: IHEP quadrupole needs > 135 amps to reach KL = 2.5


TABLE 3: ATF2 EXT quadrupoles and sextupoles (“version 3.5")----------------------------------------------------------------------------------name magnet magnet power Imax KLmax KL NOTEs name type supply p.s.----- ------- ---------- ------ ---- --------- ------- --------------------SF1X ------- 1.38S3.00 ------ 10 24.5 7.1038 FFTB sextupoleQF1X QD3Xmag Hitachi 5 QD3Xps 100 2.1050 1.0702QD2X QF3Xmag Hitachi 5 QF3Xps 100 2.1050 -0.9410SD2X ------- 2.13S3.00 ------ 10 6.5 -6.2996 FFTB sextupoleQF3X QF4Xmag Hitachi 5 QF4Xps 100 2.1050 0.6696QF4X QD4Xmag Hitachi 5 QD4Xps 100 2.1050 0.6840SD3X ------- 2.13S3.00 ------ 10 6.5 6.2996 FFTB sextupoleQD5X QD5Xmag Hitachi 5 QD5Xps 100 2.1050 -0.9276QF6X QF5Xmag Hitachi 5 QF5Xps 100 2.1050 1.1264SF4X ------- 1.38S3.00 ------ 10 24.5 -7.4491 FFTB sextupoleQF7X QD1Xmag Hitachi 2 QD1Xps 100 0.6657 0.3751QD8X QD7Xmag Hitachi 5 QD7Xps 100 2.1050 -0.5948QF9X QF6Xmag Hitachi 5 QF6Xps 100 2.1050 0.7347QK1X QK1Xmag IDX skew QK1Xps 5 2.5363e-2 0.0QD10X ------- IHEP ------ 100 2.1 -1.0237QF11X ------- IHEP ------ 100 2.1 1.0237QK2X QK2Xmag IDX skew QK2Xps 5 2.5363e-2 0.0QD12X ------- IHEP ------ 100 2.1 -1.0237QF13X QD8Xmag Hitachi 4 QD8Xps 200 2.0650 1.3683QD14X QF7Xmag Hitachi 4 QF7Xps 100 1.0488 -1.0152QF15X QD9Xmag Hitachi 4 ------ --- 2.0650 1.3683 in series with QF13XQK3X QK3Xmag IDX skew QK3Xps 5 2.5363e-2 0.0QD16X ------- IHEP ------ 100 2.1 -1.0237QF17X ------- IHEP ------ 100 2.1 1.0237QK4X QK4Xmag IDX skew QK4Xps 5 2.5363e-2 0.0QD18X ------- IHEP ------ 100 2.1 -0.6833QF19X ------- IHEP ------ 100 2.1 0.6552QD20X QD2Xmag Hitachi 2 QD2Xps 100 0.6657 -0.2989QF21X QF1Xmag Hitachi 2 QF1Xps 100 0.6657 0.2989

note: QF2X (Hitachi 1), QD6X (Tokin 3393), and one IHEP quadrupole are left over


• is the IP far enough from the west wall at 13.5 m?

• MAD deck for FF is still sketchy … need to put in BPMs, movers, etc.

• need to get another FFTB “1.38S3.00” sextupole from SLAC

• need new kicker cables (kickers are 8.2 m / 35 ns further apart)

• compact laserwire package design (laserwire chamber + wire scanner + BPM(s))

• laserwires on both sides of EXT enclosure shielding wall … light path?

• where to put: KEK BPM triplet, nanoBPM, FONT4, ODR, … ?

• skew quadrupoles for vertical dispersion correction in EXT … necessary?

• need to do more misalignment/correction and performance simulations (including realistic wire scanner resolutions) … more later

Version 3.5 Issues

atf2 layout/optics (v3.5)

Documents

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