K1.1 beam line B. H. Kang, J. K. Ahn, H. C. Bhang, Choi, M. Ieiri, - - PowerPoint PPT Presentation

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K1.1 beam line B. H. Kang, J. K. Ahn, H. C. Bhang, Choi, M. Ieiri, - - PowerPoint PPT Presentation

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WS on Hadron Beam Line Technology 11-12 May, 2007 K1.1 beam line B. H. Kang, J. K. Ahn, H. C. Bhang, Choi, M. Ieiri, M. Iio, J. Imazato, G. Y. Lim, T. Nagae, H. Noumi, Y. Sato, S. Sawada, H. Takahashi, T. Takahashi, and K. H. Tanaka K1.1

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SLIDE 1

K1.1 beam line

WS on Hadron Beam Line Technology 11-12 May, 2007

  • B. H. Kang, J. K. Ahn, H. C. Bhang, Choi,
  • M. Ieiri, M. Iio, J. Imazato, G. Y. Lim,
  • T. Nagae, H. Noumi, Y. Sato, S. Sawada,
  • H. Takahashi, T. Takahashi, and K. H. Tanaka

K1.1 configuration - outline - Prospect

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SLIDE 2

K1.1 configuration

  • outline -

Design Design goal/Layout and Concept Optics Beam envelope/Profile@FF Performance K purity/Intensity

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SLIDE 3

Hadron Experimental Hall (Phase I) Beam Dump A-Line 56 m

Extension in Phase II

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SLIDE 4

K1.1 design

Design Goal Optimized for Λ hypernuclear spectroscopy

  • Max. Central Momentum of K1.1: ~ 1.1 GeV/c

since spin-flip amp. in (K-,π-) is max. at 1.1 GeV/c Intense K- at 1.1 GeV/c: ～107 ppp for 50GeV-15μA 30 GeV-9μA is a target specification in Phase I Pure K- at 1.1 GeV/c: K/π>>1 at FF Better K/π even at MS2 for beam line counters Required a Beam Momentum Analyzer at the end

  • f K1.1.
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SLIDE 5

Layout and Concept Front End Section

2ndary Beam Extraction at 6 deg. (opposite to K1.8) Thermal protections/ Rad-Hard Equipments Cu collimator before D1 (2m drift space from T1) Magnet Operation in a Vacuum Chamber

1st and 2nd Separation Sections

Double Stage Separation : Wein Filter (ExB) Type of ES 3 vertical Slits for Kaon purification Higher order corrections to the 3rd order 4 6-poles & 2 8-poles for vertical focus at MS1 & MS2

Beam Analyzing Section

Room to place tracking chambers at the entrance & exit

  • f a DQQ system.

Focus on FF: R12~R34~R16~0

C-type Layout High-P beam line crosses

K1.1 design

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SLIDE 6

Configuration layout of K1.1c 4 Sextupoles 2 Octupoles IF-slit T1 Target FF SPES-II Front End Double Separators

7m

(Max. 1.1 GeV/c)

E S 1 ES2 MS2 MS1 High-P

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SLIDE 7

D 1 1 4 . 4 6 Q 1 8 . Q 2

  • 1

. 7 1 5 D 2 1 6 . 5 8 Q 3 8 . 4 O 1 1 . 1 1 Q 4

  • 9

. 2 4 8 S 1 1 . 4 2 S 2

  • 1

. 6 1 Q 5

  • 8

. 5 3 Q 6 8 . 9 8 7 D 2 P 2 1 8 . 5 7 2 O 2 1 . 7 7 Q 7

  • 6

. 2 3 S 3

  • .

2 S 4

  • .

1 5 Q 8

  • 9

. 2 5 Q 9 8 . 6 6 1 D 3 1 7 . 9 2 7 Q 1

  • 8

. 7 6 7 Q 1 1 9 . 3 6 C O L I F Y S E P 1 M S 1 S E P 2 M S 2 F F C O L I F Y S E P 1 M S 1 S E P 2 M S 2 F F

K1.1c Beam Line Optics (Beam envelope to the 1st Order)

DQQ F:5.489m M:0.432@MS1 F:5.337m M:-0.514@MS2 ES1 ES2 Total Length:

  • 27. 158m

IF 25 (cm) (cm) 25 Vertical Horizontal

(cm/%)

  • 25

25 (cm/%)

3 Vertical Slits: IF and 2 Mass Slits (MS1,MS2) to purify kaon beam with 2 Electrostatic Separators

R12~R34~R16~0

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SLIDE 8
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SLIDE 9

Histogram No 53 (lin) at z= 27.158 m (FF.x)

x (cm)

Counts

Mean = 0.071 RMS = 0.359 Sum = 780

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1 2 10 20 30 40 50 60 70 80 90 100 12-May-07 03:44:40 Histogram No 55 (lin) at z= 27.158 m (FF.y)

y (cm) Counts

Mean = -0.001 RMS = 0.204 Sum = 785

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  • 1

1 2 20 40 60 80 100 120 140 12-May-07 03:46:26

σ Y ~ 2 mm σ X ~ 3.6 mm

Beam Profile at FF

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SLIDE 10

A C D B E Beam F.P.

MS1

A C D B E Beam E F.P.

MS2 Optimization of Mass Slits (Heavy Alloy ~ 18.5g/cc)

0.19 0.68 996 476 5180 500 1196 668 MS2 FF 150 50 7 5 100 155 250 300 4 4 MS1 MS2 (3) 0.35 0.74 2.6 3.0 K/all MS2 FF MS2 FF (2) (1) BHK Intensity (rel.) Slit shape (mm) 1387 783 732 429 K 3368 728 176 20 pi 540 324 150 50 7 5 200 321 250 300 4 4 MS1 MS2 108 124 150 50 5 5 200 321 250 300 2 4 MS1 MS2 mu E D C B A

K π

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SLIDE 11

Contour Plot No 40 (lin) at z= 22.629 m (MS2) x (cm) y (cm) Xmean = -1.838 Xrms = 7.363 Ymean = -0.128 Yrms = 0.661 Corr = -0.032 Area/pi = 4.868 Sum = 27

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10 20

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1 2 3 4 5 12-May-07 08:14:52 Contour Plot No 50 (lin) at z= 27.158 m (FFxy) x (cm) y (cm) Xmean = -1.894 Xrms = 3.064 Ymean = 0.176 Yrms = 3.013 Corr = -0.010 Area/pi = 9.231 Sum = 31

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2 4 6 8 10

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2 4 6 8 10 12-May-07 08:15:28 Histogram No 45 (lin) at z= 22.629 m (MS2x) x (cm) Counts Mean = -0.234 RMS = 9.098 Sum = 48

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10 20 0.5 1 1.5 2 2.5 3 3.5 4 12-May-07 08:34:19 Histogram No 59 (lin) at z= 27.158 m (FF.y) y (cm) Counts Mean = 0.040 RMS = 0.174 Sum = 5

  • 1
  • 0.5

0.5 1 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 12-May-07 08:35:38

muons at FF pions at FF muons at MS2 pions at MS2 K/pi~4.2 K/pi~21 K/(pi+mu)~3.0 K/(pi+mu)~2.6

K1.1ｃ (1) by B.H.Kang

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SLIDE 12

Histogram No 53 (lin) at z= 27.158 m (FF.x) x (cm) Counts Mean = -0.506 RMS = 0.780 Sum = 169

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  • 1

1 2 5 10 15 20 25 30 12-May-07 04:04:58 Histogram No 45 (lin) at z= 22.629 m (MS2x) x (cm) Counts Mean = 1.265 RMS = 10.694 Sum = 842

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10 20 10 20 30 40 50 60 12-May-07 04:06:34 Contour Plot No 40 (lin) at z= 22.629 m (MS2) x (cm) y (cm) Xmean = 0.119 Xrms = 8.009 Ymean = 0.021 Yrms = 0.552 Corr = 0.004 Area/pi = 4.421 Sum = 135

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10 20

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1 2 3 4 5 12-May-07 04:12:42 Contour Plot No 50 (lin) at z= 27.158 m (FFxy) x (cm) y (cm) Xmean = -1.430 Xrms = 2.201 Ymean = -0.008 Yrms = 3.211 Corr = 0.073 Area/pi = 7.048 Sum = 81

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2 4 6 8 10

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2 4 6 8 10 12-May-07 04:14:00

muons at FF pions at FF muons at MS2 pions at D3out K/pi~0.4 K/pi~1.1 K/(pi+mu)~0.74 K/(pi+mu)~0.35

K1.1ｃ (2)

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SLIDE 13

Contour Plot No 43 (lin) at z= 27.573 m (FGY8) x (cm) y (cm) Xmean = -1.979 Xrms = 2.643 Ymean = -0.020 Yrms = 0.752 Corr = 0.195 Area/pi = 1.950 Sum = 644

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10 20

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10 20 11-May-07 03:06:43 Contour Plot No 31 (lin) at z= 22.285 m (FGY6) x (cm) y (cm) Xmean = -4.711 Xrms = 7.457 Ymean = -0.024 Yrms = 2.566 Corr = -0.012 Area/pi = 19.133 Sum = 1763

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10 20

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10 20 11-May-07 03:09:22 Histogram No 38 (lin) at z= 27.573 m (FGX8) x (cm) Counts Mean = -3.120 RMS = 4.957 Sum = 50

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10 20 2 4 6 8 10 12 14 16 18 20 11-May-07 03:39:13 Histogram No 32 (lin) at z= 22.285 m (FGD6) x (cm) Counts Mean = -7.769 RMS = 11.655 Sum = 2040

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10 20 30 10 20 30 40 50 60 70 80 90 100 11-May-07 03:41:36

muons at FF pions at FF muons at D3out pions at D3out K/pi~0.6 K/pi~12 K/(pi+mu)~0.9 K/(pi+mu)~0.3

K1.8BR

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SLIDE 14

8.5/4.7 3.0 >1.4E+06 750kV/10cm 2mx2 0.6E+06 1.2 27.158 K1.1c (BHK) 0.02E+06 0.6 GeV/c >7.4E+06 >7.7E+06 Signles Rate @D3out(MS2) @1.1 GeV/c $ 5.9/2.9 X/Y(FWHM) size @ FF (mm) 750kV/10cm 2mx2 500kV/10cm 6m Electro-static Separator 0.74 0.9 K−/(π−+μ− ) @ FF@1.1 GeV/c & 0.2E+06 0.8 GeV/c 1.1E+06 1.2E+06 1.1 GeV/c K− Intensity (ppp)# 2.1 2.5¥ Acceptance (msr.%) 27.158 27.573 Length (m) K1.1c (2) K1.8BR For 30 GeV-9μA primary protons

  • n the 54mm Ni Target

¥ 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) $ For Signles Rate Estimation for Trigger/Tracking Devices & cloud π not included 2007.5.12

Performance Summary

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SLIDE 15

Prospect

Further Optical Design Collect D,Q,S,O-magnets Front-end part ESS: Wien Filter Type → Radiation Resistant Collimator Vacuum Shield