+ S.Sawada + T.Miura + M. Numajiri+T.Takahashi+N.Saito+M.Iio(RIKEN)

+M. Naruki+R. Muto+A. Kiyomichi

K1.8 and K1.8BR beam linesJ-PARC Hadron Beam Line Group

WS on Hadron Beam Line Technology11-12 May, 2007

K1.8 configuration - outline -K1.8BR optionFIFC06HomeworkBeam Line Element - status -

K1.8 configuration- outline -

DesignDesign goal/Layout and Concept

OpticsBeam envelope/Beam analyzer/Profile@FF

Hadron Experimental Hall (Phase I)

Beam Dump

A-Line

56 mExtensionin Phase II

K1.8 design

Design GoalOptimized for Ξ hypernuclear spectroscopyMax. Central Momentum of K1.8: ~ 2 GeV/c

since the Ξ production is a max. at 1.8 GeV/cIntense K- at 1.8 GeV/c: ～107 ppp for 50GeV-15μA

30 GeV-9μA is a target specification in Phase IPure K- at 1.8 GeV/c: K/π>>1 at FF

Better K/π even at MS2 for beam line countersRequired a High Res. Beam Analyzer

for Precision Spectroscopy of Ξ hypernuclei

Layout and ConceptFront End Section2ndary Beam Extraction at 6 deg. Thermal protections/ Rad-Hard Equipments

Cu collimator before D1Magnet Operation in a Vacuum Chamber

1st and 2nd Separation SectionsDouble Stage Separation: 3 vertical Slits for Kaon purificationHigher order corrections to the 3rd order

4 6-poles & 3 8-poles for vertical focus at MS1 & MS2Beam Analyzing SectionPoint-to-point Optics btwn entrance & exit of a QQDQQ

eliminate the multiple scattering effect to the 1st orderFocus on FF: R12~R34~R16~0

K1.8 design

Configuration layout of K1.8

4 Sextupoles

3 Octupoles

IF-slit

T1 Target

FF

SKS+

SPES-II

Beam AnalyzerFront End Double Separators

7m(Max. 2 GeV/c)

ES1ES2

MS2MS1

K1.8 Beam Line OpticsD1

13.099

Q1

7.600

Q2

-7.409

D2

17.465

Q3

7.900

Q4

-8.800

S1

0.571

S2

-1.436

Q5

-6.515

Q6

7.639

D3

14.116

Q7

-5.300

S3

-1.585

S4

0.250

Q8

-8.660

Q9

10.627

Q10

9.789

Q11

-7.995

D4A

15.010

D4B

15.010

D4C

15.010

D4D

15.010

Q12

8.500

Q13

-6.701

WNDW

COL

IF

O1

CM1

CM2

MS1

O2

CM3

CM4

O3

MS2

VI

VO

FF

WNDW

COL

IF

O1

CM1

CM2

MS1

O2

CM3

CM4

O3

MS2

VI

(Beam envelope to the 1st Order)

QQDQQ

F:5.656mM:0.6@MS1

F:5.038mM:-0.8@MS2

ES1 ES2

Total Length:45.853 m

IF

0

25(cm)

(cm)25

Ver

tical

Hor

izon

tal

(cm/%)-25

25(cm/%)3 Vertical Slits: IF and 2 Mass Slits (MS1,MS2)

to purify kaon beam with 2 Electrostatic Separators

Beam AnalyzerFor Ξ hypernuclear Spectroscopy by (K-,K+) [E05]

ΔE~3 MeV (FWHM) together w/ SKS+

VO → VI (Point to Point Optics)1st Order Resolution :

R11=-0.44, R12=0, R16=1.57 cm/%dp/p~1.4x10-4 (in Sigma)

assuming σx~200μm(c.f. in case of K6: 1.3x10-4)

→h.o. correction:orbit analysis w/ Tracking Dev.

MS2

FF

VI

VO

Q Q

Dipole:A12 from SaclayQ’s from KEK-K6

Q

Q64°

ρ ~ 4 m

R12~R34~0@FF

Tracking Devices

TrackingDevices

Kaon Beam Profile at FF of K1.8

x (cm)

Cou

nts

Mean = 0.134RMS = 1.984Sum = 1239

-20 -10 0 10 200

50100150200250300350400

y (cm)

Cou

nts

Mean = 0.021RMS = 0.321Sum = 1240

-10 -8 -6 -4 -2 0 2 4 6 8 100

100200300400500600700800

x' (mrad)

Cou

nts

Mean = -1.132RMS = 16.646Sum = 1385

-50 -40 -30 -20 -10 0 10 20 30 40 500

102030405060708090

100

y' (mrad)

Cou

nts

Mean = -0.595RMS = 2.197Sum = 1409

-30 -20 -10 0 10 20 300

100

200

300

400

500

Contour Plot No 47 (lin) at z= 34.185 m (FGY7)

x (cm)

y (c

m)

Xmean = -0.047Xrms = 3.310Ymean = 0.403Yrms = 2.339Corr = 0.022Area/pi = 7.743Sum = 830

-20 -10 0 10 20-20

-10

0

10

2011-May-0714:53:36

Contour Plot No 70 (lin) at z= 45.853 m (FGY8)

x (cm)

y (c

m)

Xmean = -6.456Xrms = 5.888Ymean = 0.755Yrms = 2.128Corr = -0.314Area/pi = 11.894Sum = 70

-20 -10 0 10 20-20

-10

0

10

2011-May-0714:56:02

muons at FFmuons at MS2out

K/(pi+mu)~3.5K/(pi+mu)~0.7

Histogram No 46 (lin) at z= 34.185 m (FGY7)

y (cm)

Cou

nts

Mean = -0.029RMS = 0.385Sum = 102

-1 -0.5 0 0.5 10

2

4

6

8

10

12

14

11-May-0715:10:40

Histogram No 53 (lin) at z= 45.853 m (FGX8)

x (cm)

Cou

nts

Mean = -6.267RMS = 3.629Sum = 7

-20 -10 0 10 200

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

1.8

2

11-May-0715:11:59

pions at FFpions at MS2out

K/pi~1.1K/pi~6

0.54E+062.7E+061.5 GeV/c

＞8E+06＞33E+06Single Rate @ MS2 @ 1.8 GeV/c$

19.8/3.2X/Y(rms) size @ FF (mm)

2Max. Mom. (GeV/c)

750kV/10cm6m×2

Electro-static Separator

6.9８K−/π− @ FF @ 1.8 GeV/c

0.08E+060.38E+061.1 GeV/c

1.4E+066.6E+061.8 GeV/cK−(π) Intensity (ppp)#

1.4Acceptance (msr.%) 45.853Length (m)

(30 GeV-9μA)K1.8

(50 GeV-15μA)

# using Sanford-Wang formula, assuming 1pulse=3.53s（0.7s flat top) $ Signle Rate Estimation for Trigger/Tracking Devices to be placed just after MS2

K1.8 Performance Summary 051011

K1.8BR option

Concept

OpticsBeam envelope/Profile@FF

K1.8BR performance summary

K1.8BR Beam Line• Branch at D3 of K1.8

Beam bent opposite side at D3, +SQDQ to focus at FFTime sharing with K1.8helpful for efficient experimental execution/coordination

• Single ES Stage, Shorter BL (27.6m)Intensity of K- at 1.1 GeV/c:~15 times > K1.8 Intense Low Momentum Kaon (<1.2 GeV/c)

K1.8

SPES-II

D3

MS1

FF of K1.8BR

D4

Q8

Q7S3

D1

13.099

Q1

7.600

Q2

-7.409

D2

17.465

Q3

7.900

Q4

-8.800

S1

0.226

S2

-1.282

Q5

-6.655

Q6

8.437

D3

14.116

S2

0.798

Q7

-9.239

D41

31.628

D42

31.628

D43

31.628

D44

31.628

Q8

13.254

WNDW

COL

IF

O1

CM1

CM2

MS1

VI

FF

WNDW

COL

IF

O1

CM1

CM2

MS1

VI

FF

K1.8BR Beam Line Optics (Beam envelope to the 2nd Order)

QDQ

MS1

ES1

Total Length:27.573 m

IF

25(cm)

(cm)25

Ver

tical

Hor

izon

tal

(cm/%)-25

25(cm/%)

S3

D3S2S1

O1

Beam Profile at FF of K1.8BR （S3 on)

X@FF

y (cm)

Cou

nts

Mean = 0.024RMS = 0.292Sum = 2405

-10 -8 -6 -4 -2 0 2 4 6 8 100

200

400

600

800

1000

1200

1400

x (cm)

Cou

nts

Mean = -0.009RMS = 0.588Sum = 2405

-20 -10 0 10 200

100200300400500600700800900

100011001200

y' (mrad)

Cou

nts

Mean = 0.514RMS = 2.565Sum = 2399

-30 -20 -10 0 10 20 300

100

200

300

400

500

600

700

800

900

x' (mrad)

Cou

nts

Mean = -0.687RMS = 22.717Sum = 2051

-50 -40 -30 -20 -10 0 10 20 30 40 500

102030405060708090

100110120

0.02E+060.1E+060.6 GeV/c

>7E+06＞30E+06Single Rate@D3out @1.1 GeV/c $

5.9/2.9X/Y(FWHM) size @ FF (mm)

500kV/10cm6m

Electro-static Separator

6.87.5K−/π− @ FF@1.1 GeV/c &

0.2E+061.0E+060.8 GeV/c1.2E+065.5E+061.1 GeV/c

K− Intensity (ppp)#2.5¥Acceptance (msr.%)

27.573Length (m)(30 GeV-9μA)

K1.8BR(50 GeV-15μA)

¥ IF/MS1 Heavy Alloy: IF opening 4 mm, MS1 opening 4.66 mm# using Sanford-Wang formula, assuming 1pulse=3.53s（0.7s flat top)$ Signle Rate Estimation for Trigger/Tracking Devices to be placed just after D3& cloud π not included

2005.10.11K1.8BR Performance Summary

Contour Plot No 43 (lin) at z= 27.573 m (FGY8)

x (cm)

y (c

m)

Xmean = -1.979Xrms = 2.643Ymean = -0.020Yrms = 0.752Corr = 0.195Area/pi = 1.950Sum = 644

-20 -10 0 10 20-20

-10

0

10

2011-May-0703:06:43

Contour Plot No 31 (lin) at z= 22.285 m (FGY6)

x (cm)

y (c

m)

Xmean = -4.711Xrms = 7.457Ymean = -0.024Yrms = 2.566Corr = -0.012Area/pi = 19.133Sum = 1763

-20 -10 0 10 20-20

-10

0

10

2011-May-0703:09:22

Histogram No 38 (lin) at z= 27.573 m (FGX8)

x (cm)

Cou

nts

Mean = -3.120RMS = 4.957Sum = 50

-20 -10 0 10 200

2

4

6

8

10

12

14

16

18

20

11-May-0703:39:13

Histogram No 32 (lin) at z= 22.285 m (FGD6)

x (cm)

Cou

nts

Mean = -7.769RMS = 11.655Sum = 2040

-30 -20 -10 0 10 20 300

10

20

30

40

50

60

70

80

90

100

11-May-0703:41:36

muons at FF

pions at FF

muons at D3out

pions at D3out

K/pi~0.6K/pi~12

K/(pi+mu)~0.9K/(pi+mu)~0.3

FIFC in October, 2006

FIFC report

report to FIFC by J. Doornbos

FIFC report → http://j-parc.jp/NuclPart/pac_0701/FIFC_report_submitted.pdf

(1) Front end part…does not find any essential problems

(2) ES and MS …no significant concern about its performance. It is remarked that the experience

at KEK-PS is very useful and important in the operation fo these separators.(3) BA and Final Focusing system

…convinced with this performance of momentum resolution from the beam opticalpoint of view. …essential for the chamber to work properly in high hit-rate…

(4) Optics design and K-pi separation…agrees with the presented performance as a whole, although it wants to reserve

some uncertainty in the estimate of the K/pi ratio.(5) K1.8BR

…accepts the proposed performance… the K/pi which had better to be regarded with some ambiguity. …was concerned about the muon contamination in the beam, since it could influence on the exp condition…

… recommends ... to evaluate it seriously soon. (6) Conclusion

…found no problem in the prospect that K1.8 and K1.8BR will be operational withsufficient performance for the experiments, in general. It is remarkable that the high K/pi presented …has been supported by an independent check by an external reviewer (J.D.). However, the ambiguity of the estimate has to be takento be large.

Report to FIFC by J. Doornbos → attached in the FIFC report

Individual check by using ZGOUBI and REVMOC

K1.8 : 1.8 GeV/c, 750 kV/10cm double stage ES, σ~1.3mm at T1~45 m, 1.4 msr%, pion/kaon at FF~570 if ES1=ES2=0

(1) Direct pionspion/kaon ~ 0.1 at FF, even no octupoles

(2) Cloud pionsno problem, MS1 & 2 reduce by a factor 5, IF further reduce by a factor 3

(3) Muonsmuon/kaon ~ 0.1

(4) Slit scattering of pions (at IF)pion/kaon ~ 0.2 at most

(5) In total, Kaon/(pi+mu) ~ 3 at FF

K1.8BR : 1.1 GeV/c, 500 kV/10cm single stage ES~27 m, 2 msr%, pion/kaon at FF~1200 if ES1=ES2=0

(1) Direct pions will be negligible(2) Cloud pions can be reduced by an order of magnitude by IF and MS1(3) Slit scattering at IF: pion/kaon ~ 0.3(4) Muons: muon/kaon ~ 1.75 at FF

Homeworkgiven on 22/Dec/2006

Q01A

8.328

Q02A

-5.806

H03A

18.553

H03B

18.553

Q03A

9.925

Q04A

-7.064

Q05A

4.237

H05A

18.757

H05B

18.757

V06A

15.406

V06B

15.406

Q06A

7.316

Q06C

7.316

Q07A

-7.316

Q07C

-7.316

Q08

0.000

Q09A

7.316

Q09C

7.316

Q0AA

-7.316

Q0AC

-7.316

Q11A

8.340

Q12A

-7.174

Q13A

9.770

Q14A

-6.122

V14A

15.406

V14B

15.406

Q15A

6.843

Q16A

-6.812

Q17A

8.115

Q18A

-10.040

Q19A

10.584

Q1AA

-10.825

Q1BA

6.812

Q1CA

-12.587

Q1DA

6.812

V04

MP

H07

V08

SM

H13

H15

T0

H16

V17

BS1

BS2

T1

H18

V18

DMP1

DMP2

V04

MP

H07

V08

SM

H13

H15

T0

H16

V17

BS1

BS2

T1

H18

V18

DMP1

DMP2

Beam Envelope（30 GeV SEB:εH=4.4π / εV=10.4π mm・mr）

10cm

10cm

(H)

(V)

260m0mQ

18

Q17

Q19

BeamDump

Q1C

Q1D

210m100m60m 150m

T1T0SMMP

Switch YardMatching S. HD-Hall

15x40 15x40 φ8 φ4 φ200

Tracking Simulation for Slow Extraction Beam by M. Tomizawa

メイン取り出しビーム 50GeV (エミッタンス6.1pi, dp/p 0.25%)

Ｑ、Ｄ磁石共multipole 成分 ＯＮ ステップサイズ約２０ｍｍ＠ＥＳＳ

プロット：ビーム分布＠QFP入口

Fixed Bump Dynamic Bump

x (cm)

x' (m

rad)

Xmean = 0.002Xrms = 0.809Ymean = 0.002Yrms = 0.765Corr = 0.868Area/pi = 0.307Sum = 100001

-4 -2 0 2 4-5

-4

-3

-2

-1

0

1

2

3

4

5

y (cm)

y' (m

rad)

Xmean = 0.001Xrms = 0.529Ymean = -0.002Yrms = 0.925Corr = -0.434Area/pi = 0.441Sum = 100001

-4 -2 0 2 4-5

-4

-3

-2

-1

0

1

2

3

4

5

11.6π mm･mr 17 .3π mm･mr

Beam Emittance (color) and Acceptance (black)

Histogram No 39 (lin) at z=202.796 m (T1X)

x (cm)

Cou

nts

Mean = 0.009RMS = 0.098Sum = 1987

-2 -1 0 1 20

100200300400500600700800

Histogram No 41 (lin) at z=202.796 m (T1Y)

y (cm)

Cou

nts

Mean = -0.005RMS = 0.101Sum = 1987

-2 -1 0 1 20

100200300400500600700800

Beam Profile @ T1(30 GeV）

σ~1mm σ~1mm

x (cm)

x' (m

rad)

Xmean = 0.002Xrms = 0.809Ymean = 0.002Yrms = 0.765Corr = 0.868Area/pi = 0.307Sum = 100001

-4 -2 0 2 4-5

-4

-3

-2

-1

0

1

2

3

4

5

y (cm)

y' (m

rad)

Xmean = 0.001Xrms = 0.529Ymean = -0.002Yrms = 0.925Corr = -0.434Area/pi = 0.441Sum = 100001

-4 -2 0 2 4-5

-4

-3

-2

-1

0

1

2

3

4

5

30 GeV scattered at ESS(1.39kW) Loss:18W@q17,18/ 229W@q1D

Cou

nts

y (cm)

Mean = 0.019RMS = 0.199Sum = 3055

-2 -1 0 1 20

100

200

300

400

500

600

seb8f1tu.dat

x (cm)

Cou

nts

Mean = -0.023RMS = 0.097Sum = 3057

-2 -1 0 1 20

100200300400500600700800900

100011001200

x (cm)

x' (m

rad)

Xmean = 0.002Xrms = 0.809Ymean = 0.002Yrms = 0.765Corr = 0.868Area/pi = 0.307Sum = 100001

-4 -2 0 2 4-5

-4

-3

-2

-1

0

1

2

3

4

5

y (cm)

y' (m

rad)

Xmean = 0.001Xrms = 0.529Ymean = -0.002Yrms = 0.925Corr = -0.434Area/pi = 0.441Sum = 100001

-4 -2 0 2 4-5

-4

-3

-2

-1

0

1

2

3

4

5

30 GeV scattered, recirculated (1.12kW) No Loss

y (cm)

Cou

nts

Mean = 0.020RMS = 0.154Sum = 2481

-2 -1 0 1 20

100

200

300

400

500

600

700

seb8f1tu.dat

x (cm)

Cou

nts

Mean = 0.104RMS = 0.111Sum = 2481

-2 -1 0 1 20

100200300400500600700800900

100011001200

Histogram No 39 (lin) at z=202.796 m (T1X)

x (cm)

Cou

nts

Mean = 0.009RMS = 0.098Sum = 1987

-2 -1 0 1 20

100200300400500600700800

Histogram No 41 (lin) at z=202.796 m (T1Y)

y (cm)

Cou

nts

Mean = -0.005RMS = 0.101Sum = 1987

-2 -1 0 1 20

100200300400500600700800

Histogram No 39 (lin) at z=202.796 m (T1X)

x (cm)

Cou

nts

Mean = 0.009RMS = 0.098Sum = 1987

-2 -1 0 1 20

100200300400500600700800

Histogram No 41 (lin) at z=202.796 m (T1Y)

y (cm)

Cou

nts

Mean = -0.005RMS = 0.101Sum = 1987

-2 -1 0 1 20

100200300400500600700800

×130(scatt.) ×160(recirc.) ×260(scatt.)×275(recirc.)

σ~1mm σ~1mm

Slow Extraction Beam :• 30 GeV, 9μA (270 kW) in Phase 1• Tracking Simulation for Extraction Beam by M. Tomizawa

Extracted Beam Power normalized to be 270 kWScatterred by ESS

Kicked & Extracted……………1.39kW (0.5%)Horizontally shiftedVertically broadened

Recirculated & Extracted……..1.29 kW (0.5%)Vertically broadened

Beam Loss along the Beam LineKicked & Extracted……..18W Loss at q17,18 (<200W)Recirc. & Extracted……..no loss till T1

Beam Profile at T1Kicked & Extracted……..Vertically broad tail (small fraction)Recirc. & Extracted……..Vertically broad tail (small fraction)

0

0.2

0.4

0.6

0.8

1

1.2

0 2 4 6 8 10 12 14

beam size at T1 (mm)

K in

t (r

ela

tive

)

0

2

4

6

8

10

12

K/p

i

K int(FF)

K/pi (FF)

K/(pi+mu)

Kaon intensity and K/pi as a function of the beam spot size at T1

Beam Line Element- status -

ScheduleIF SlitMagnet Layout

Q3~CM1Mass Slit

Construction Schedule of K1.8 and K1.8BR

0.74 (2.48) (5.71) ?

K1.8 upstream configuration

IF

MS1

D3ES1Q3~CM1 CM2~Q6D2Q2

(400)

200mm150mm

X

Z

水平方向可動スリット

Z

Y

300mm300mm

100mm

鉛直方向可動スリット

IF slit (brass)

φ300 pillow seal

5 m

Service Space

Drawn by M. Naruki

HMHMBrass

EDCBA

1009.21004004.8MS220010.91003004.5MS1--1003004IF

0

500

1000

1500

2000

2500

3000

3500

4000

HM-HM-HM

Brass-HM-HM

Brass-HM-Brass

Brassx3 Brass-HM-Mo

Brass-HM-Lead

0

1

2

3

4

5

6

7

8

K/π@FF

K intensity@MS2

K intensity@FF

π/K@MS2K in

tens

ity（re

lativ

e)

K/π

or π/K

A

C

D

BE

F.P.Slit body

π’s

K’s

Choice of Materials for Three Vertical Slits

Design of the mass slit

Optimizing the slit opening/shape

Unit:mm

D6 at BNL-AGS

Beam Line Magnet Installation

2007. 6 HD-Hall Civil Construction Complete→ Survey, Beam Line Marking will start

Drawn by G.Y.Lim