j-parc hadron beam line group - kek-ps home...9intense k- at 1.8 gev/c: ~107 ppp for 50gev-15μa...
TRANSCRIPT
+ 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− @ [email protected] 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