July 26, 2005 ILC BDS Meeting 1

De-extended Coupling Correction and Emittance Diagnostic Section for “optimal” ATF2

nBPM (SLAC)nBPM (KEK)

FONT

Compton / laserwire

ODR

Existing ATF Extraction Line

Coupling Correction /Emittance Diagnostics

July 26, 2005 ILC BDS Meeting 2

wall

5 m

Insufficient space in previous design for post-IP diagnostics, beam-photon separation, dump, and shielding … need to shorten system by ≈ 5 m

July 26, 2005 ILC BDS Meeting 3

90°90°

180°90°

90°90°

– x– y

33°57°

57°33°

33°57°

57°33°

SQ SQ SQ SQ

WS WS WS WS WS

59.28.3

108.04.5

59.28.3

108.04.5

59.28.3σ (μm)

2.0 2.0 2.0 2.0 2.0

2.0 2.0 2.0 2.0

1.3 1.3 1.3 1.3

EXT Diagnostic Section (optimal2)

July 26, 2005 ILC BDS Meeting 4

SQ SQ SQ SQ

WS WS WS WS WS1.0 1.0 1.0 1.0 1.70.7 0.7 0.7 0.7 1.0 3.03.0 3.0

90°90°

180°90°

90°90°

– x– y

55°25°

41°31°

31°41°

26°26°

34.18.6

136.36.2

80.410.5

136.36.2

80.410.5σ (μm)

ΔL = -5.0 m (w.r.t. optimal2)

July 26, 2005 ILC BDS Meeting 5

β*x,y = 4,0.1 mm

30 cm offset

July 26, 2005 ILC BDS Meeting 6

new quadrupole (between QF3X and BH1X.3)

1 2

-1 0 0 0

-0.54 -1 0 0

0 0 -1 0

0 0 1.56 -1

K KR

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July 26, 2005 ILC BDS Meeting 8

Assembly Hall

14.13 m(IP to wall)

July 26, 2005 ILC BDS Meeting 9

• as-installed survey coordinates of existing EXT magnets come from a previous incarnation of the SAD input

– magnet core lengths were used for effective lengths– SAD “COORD” elements (which model beams going off-axis through

quadrupoles) were correct for vintage QM6R/QM7R strengths

• Woodley’s MAD deck based on 1999 SAD input from T. Okugi

– corrected effective lengths for magnets … bend angles not changed– “DRLBW44” strengths for QM6R and QM7R– SAD “COORD” elements not updated

MAD SURVEY coordinates for existing EXT magnets were wrong at the centimeter level

Layout / survey

July 26, 2005 ILC BDS Meeting 10

July 26, 2005 ILC BDS Meeting 11

July 26, 2005 ILC BDS Meeting 12

• MAD deck corrected to match as-installed survey coordinates of existing EXT magnets (quads and bends)

– effective lengths of QM6R, QM7R, and bends set to their core lengths– off-axis quadrupoles QM6R and QM7R modeled as bends with gradients …

bend angles adjusted to emulate effects of SAD “COORD” elements– drift spaces between magnets adjusted accordingly

MAD SURVEY coordinates for existing EXT magnets now agree with as-installed SAD survey coordinates1 at the micrometer level

Layout / survey (2)

1See S. Kuroda’s SAD survey output file: ff3.5.1_disp_g.txt

July 26, 2005 ILC BDS Meeting 13

July 26, 2005 ILC BDS Meeting 14

July 26, 2005 ILC BDS Meeting 15

Name s (SAD) S (MAD) Gx (SAD) Z (MAD) Gy (SAD) X (MAD) Chi1(SAD) YAW (MAD)---- --------- --------- --------- --------- --------- --------- --------- ---------KE1X 0.250000 0.250000 0.000312 0.000312 0.250000 0.250000 0.143239 0.143239BS1X 3.700071 3.700077 0.025150 0.025150 3.699973 3.699973 0.868459 0.868459BS2X 4.600071 4.600077 0.056730 0.056730 4.599332 4.599332 3.801402 3.801402BS3X 5.700071 5.700077 0.192062 0.192062 5.689944 5.689944 12.664068 12.664068QD1X 7.290071 7.290077 0.692058 0.692058 7.198357 7.198357 19.396953 19.396953BH1X 8.080071 8.080077 0.971859 0.971859 7.936761 7.936761 24.754357 24.754357QD2X 8.810071 8.810077 1.321633 1.321633 8.577118 8.577118 30.111760 30.111760QF1X 9.635503 9.635509 1.735743 1.735743 9.291156 9.291156 30.111760 30.111760BH2X 10.400070 10.400076 2.102860 2.102860 9.961415 9.961416 24.754357 24.754357QF2X 11.969442 11.969448 2.641499 2.641499 11.434954 11.434954 19.396953 19.396953QD3X 13.930070 13.930076 3.292645 3.292645 13.284298 13.284298 19.396953 19.396953KE2X 15.850070 15.850076 3.930593 3.930592 15.095215 15.095216 19.540192 19.540192QF3X 16.490070 16.490076 4.145865 4.145865 15.697924 15.697924 19.683432 19.683432BH3X 17.980070 17.980076 4.629940 4.629940 17.106606 17.106606 14.326028 14.326028QF4X 18.870070 18.870076 4.787053 4.787053 17.982236 17.982236 8.968625 8.968625QD4X 19.530070 19.530076 4.889943 4.889943 18.634167 18.634167 8.968625 8.968625QD5X 21.820070 21.820076 5.246939 5.246939 20.896169 20.896169 8.968625 8.968625BH4X 23.189144 23.189150 5.407974 5.407974 22.253998 22.253998 0.019047 0.019047QF5X 24.340144 24.340149 5.281695 5.281695 23.396503 23.396503 -8.930530 -8.930530

Note: Chi1 and YAW are degrees; everything else is meters

SAD/MAD Geometry Comparison (ff3.5.1_disp_g.txt vs “optimal3”)

July 26, 2005 ILC BDS Meeting 16

• verify that sufficient space is now available for post-IP diagnostics and dump (radiation safety considerations)

• can we can put < 10 μm diameter carbon wires in wire scanners?

• TURTLE tracking … optimize system bandwidth and performance

• revisit simulations of steering and dispersion/coupling correction with machine and diagnostics errors

• document quad locations, strengths, and power supply configuration

• update for ATF2 proposal document

Continuing work