atf2 layout/optics (v3.7)

Mark Woodley, SLAC July 18,2007 1

ATF2 Layout/Optics (v3.7)

nBPM (SLAC)nBPM (KEK)

FONT

Compton / laserwire

ODR

Existing ATF Extraction Line

Coupling Correction /Emittance Diagnostics


(v3.7)


• remove EXT sextupoles

• remove FF octupoles and decapoles

• 2 new IDX skew quadrupoles in EXT for vertical dispersion correction (Okugi-san’s locations)

• final magnet designs selected; use correct effective lengths, bores, gaps, etc.

• all diagnostic and correction devices (that I know of) now in MAD decks

• more QBPMs added in EXT … total for ATF2 is now 34– “standard” installation for all BPMs is on downstream end of magnet … as discussed

and agreed at the SLAC-ATF2 meeting last March (there are some exceptions)

• nomenclature for FF devices updated– “FF” appended to device names– as Kuroda-san suggested, “QD10” quads become “QD10BFF” and “QD10AFF” (also

“QF9”, “QF5”, and “QD4”)– “QD2B” (a QF) and “QF3” (a QD) become “QF3FF” and “QD2BFF” respectively

Version 3.7 Changes


Program σy*(rms) σy*(sig) εy Δεy

nm nm nm %-------- -------- -------- ------- -----MAD 38.261 35.524 32.8839 9.6ELEGANT 38.401 35.551 32.9674 9.9TURTLE 36.292 34.791 31.6332 5.4DIMAD 38.165 36.575 32.7121 9.0LUCRETIASAD

Tracking Results

• perfect machine

• 10,000 particles (Gaussian distributions; 5σ)

• sextupole component in SHI H-bends included

• multipoles in SLAC epoxy kickers, QM7R.1, BS1X, QF1, and QD0 not included

• no chromatic correction in EXT


BH2

BH1

BH1

K1

K2

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

6.0 m

ATF2 Inflector (v3.7)


Honda Monitor ; Moving Stage 350 nm – 1 micron ( -540mm from IP) ( Beam Vibration )

Shintake Monitor ; Sweeping Magnet < 350 nm ( at IP ) Phase Scan

Carbon Wire ; Moving Stage ( micron level ) > 1 micron ( +390mm from IP) Sweeping Magnet ( sub-micron level )

from Okugi-san’s 4th ATF2 Project Meeting talk

200350

Shintake Monitor Area

IP

390540

547.5

135180120 100

705

QD0

SweepingMagnet

HondaMonitor

100180

155

100

CarbonWire

C-bandBPM

180

ScreenMonitor

705

Dump Bend

605 105150

135 180100

IP configuration Monitors : 3 beam size monitors 2 C-band BPMs 1 Screen Monitor 1 ICT 1 IP-BPM

IP-BPM

S-bandBPM

550 150

C-bandref

C-bandBPM ICT

FF: IP Area


-1 0 0 0

-0.73 -1 0 0

0 0 2.35 -1.76

0 0 -1.94 1.87

R

K1(+) K2(+)


25 30 35 40 45 500

2

4

6

8

10

12

14

16

18

20

Be

ta (

m)

S (m)

EXT Diagnostic Section (version 3.7)

2.55 1.24 1.27 1.26 3.82 3.82 3.760.85 0.85 1.27 2.200.42 0.86 0.86

SQ SQ SQ SQ WS WS WS WS WS

90°90°

180°90°

90°90°

– x– y

11°18°

28°29°

42°43°

29°29°

80.610.0

154.76.7

88.511.7

153.06.6

86.511.7σ (μm)

7 < σx/σy < 23


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 m

σz = 8 mmσδ = 0.08 %βx* = 4 mm

βy* = 0.1 mmσx* = 2.828 μm

σy* = 34 nm


• stabilize beam into Final Focus (especially at sextupoles)• 2 dipole correctors per plane (Final Doublet phase and IP phase)• 2 BPMs per plane (Final Doublet phase and IP phase)• correctors and BPMs should be as far downstream as possible• feedback BPMs should have no dispersion• cavity BPMs used for feedback must have movers• BPMs must have resolution ≤ spot size for sub-σ stabilization• requires sub-micron resolution for vertical BPM at IP phase

– move nanoBPM setup to selected location (between QM14FF and QM13FF … it’s a tight fit) and use nBPM3 for feedback … or …

– could we use the IPBPM test setup here instead?

• use a stripline BPM for horizontal BPM at IP phase

Pulse-to-Pulse Feedback


40 45 50 55 60 65 70 75 80 85-2.5

-2.25

-2

-1.75

-1.5

-1.25

-1

-0.75

-0.5

-0.25

0

(

rad

/2 )

S (m)

B5F

F

B2F

F

B1F

F

QD

18X

QF

19X

QD

20X

QF

21X

QM

16F

F

QM

15F

F

QM

14F

F

QM

13F

F

QM

12F

F

QM

11F

F

QD

10B

FF

Q

D10

AF

F

QF

9BF

F

QF

9AF

F

QD

8FF

QF

7FF

QD

6FF

QF

5BF

F

QF

5AF

F

QD

4BF

F

QD

4AF

F

QF

3FF

QD

2BF

F

QD

2AF

F

QF

1FF

QD

0FF

SF

6FF

SF

5FF

SD

4FF

SF

1FF

SD

0FF

ATF2 pulse-to-pulse feedback devices (v3.7)

XY

IP

IP phase

FD phase

IP phase

FD phase

IP phase

FD phase

IP phase

FD phase

IP phase

FD phase

ZV11X

ZV1FF

QBPM7FF

nBPM3

ZH10X

ZH1FF

ML1FF

QBPM9FF

ZHZVBPM


40 45 50 55 60 65 70 75 80 850

1000

2000

3000

4000

X B

ea

m S

ize

(m

)

40 45 50 55 60 65 70 75 80 850

100

200

300

400

Y B

ea

m S

ize

(m

)

S (m)

ATF2 pulse-to-pulse feedback devices (v3.7)

302.6 µm

0.4 µm

1910.5 µm

7.9 µm

ZHBPM

ZVBPM


• 2 new IDX skew quadrupoles (QS1X and QS2X)

• 2 new 20 amp bipolar power supplies (QK1X and QK4X)

• 4 new NKK CH horizontal dipole correctors (with 5(?) amp bipolar power supplies)

• 2 new NKK CV vertical dipole correctors (with 5(?) amp bipolar power supplies)

• QD14X running at 97% of max power supply current (see parts list … )

• FF matching quadrupoles (QM16FF – QM11FF): bipolar power supplies?

• power supply for BDMP

• Alexander Kalinin’s Feedforward/Feedback devices for EXT have not yet been incorporated into the MAD decks … should they be? can they coexist with FONT?

• off-beamline components (detectors, gamma collimators, MONALISA, etc.) not included

• also see comments and notes on each worksheet of the parts list …

Version 3.7 Parts List Issues


• OTR1X … interference with DR quadrupole QM8R.1?

• nanoBPM setup … does it fit between QM14FF and QM13FF? (if not, move QM14FF upstream); can we use it for pulse-to-pulse feedback?

• should there be a location reserved for ODR?

• FONT kickers are not in the deck yet … need a design (30 cm striplines? FEATHER kickers?

• Kalinin’s feedforward/feedback devices?

• possible reduced (20-25%) gradient for extracted beam in QM7R.1: can’t match in EXT using only quadrupole strengths … change DR optics to compensate?

• simulations with estimated multipole content of SLAC epoxy kickers, QM7R.1, BS1X, and shimmed QC3s

• need “small spot” optics for LW1X (1 µm) operation

• need to redo and expand full tuning simulations

• MPS issues for commissioning?

Version 3.7 Optics and Simulation Issues


Version 3.7 ReleaseFiles

Release v3.7 Files (July 18, 2007)--------------------------------------------------------------------------------ATF2_common.xsif : MAD input file (common definitions)EXT_v3.7.xsif : MAD input file (EXT line)FF_v3.7.xsif : MAD input file (Final Focus)inrays.mad : MAD input ray definitions (10000) for trackingATF2_v3.7.mad : top level MAD command fileATF2_v3.7.save : MAD SAVE file (for conversion to other optics program inputs)ATF2_v3.7.saveline : MAD SAVELINE file (for conversion to other optics program inputs)--------------------------------------------------------------------------------ATF2v3.7.ppt : v3.7 overview presentation (PowerPoint)ATF2v3.7.pdf : v3.7 overview presentation (pdf)ATF2DeviceListv3.7r0.xls : detailed parts list (Excel)ATF2v3.7Layout.ppt : scaled cartoons of specific locations (PowerPoint)ATF2v3.7Devices.txt : simple text file with device names, lengths, center positions, and nearby spacesATF2v3.7Devices.fig : scrollable beamline schematic (Matlab figure file)MagnetPositions.txt : comparison of v3.7 magnet positions to their v3.6 positions--------------------------------------------------------------------------------

atf2 layout/optics (v3.7)

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