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 configuration - outline - � Prospect
K1.1 configuration - outline - � Design Design goal/Layout and Concept � Optics Beam envelope/Profile@FF � Performance K purity/Intensity
Hadron Experimental Hall (Phase I) A-Line Beam Dump Extension in Phase II 56 m
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: ～ 10 7 ppp for 50GeV-15 μ A 30 GeV-9 μ A 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 of K1.1.
K1.1 design 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 � 1 st and 2 nd Separation Sections Double Stage Separation : Wein Filter (ExB) Type of ES 3 vertical Slits for Kaon purification Higher order corrections to the 3 rd 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 of a DQQ system. Focus on FF: R12~R34~R16~0 � C-type Layout High-P beam line crosses
Configuration layout of K1.1c (Max. 1.1 GeV/c) T1 Target IF-slit 4 Sextupoles E Front End MS1 S 1 ES2 Double Separators MS2 2 Octupoles High-P SPES-II FF 7m
K1.1c Beam Line Optics (Beam envelope to the 1 st Order) (cm) (cm/%) 25 -25 D Q Q D Q O Q S S Q Q D O Q S S Q Q D Q Q F:5.489m F:5.337m 1 1 2 2 3 1 4 1 2 5 6 2 2 7 3 4 8 9 3 1 1 P 0 1 IF 2 M:0.432@MS1 M:-0.514@MS2 C I M M M M F F C I O F S S S S F F O F L Y 1 1 2 2 L Y Vertical DQQ ES2 ES1 R12~R34~R16~0 0 Horizontal 1 1 1 1 4 6 S S 8 S S 7 . - . E E . E E . 4 1 5 - P P - - 5 - - P P - - 9 - Total Length: 0 8 0 0 8 1 9 1 1 1 1 8 8 7 1 6 0 2 2 0 9 8 2 8 9 6 . . 8 . . . . . . . 2 . . . . . . 7 . . 0 7 4 1 2 0 6 5 9 7 2 2 1 2 6 7 3 27. 158m 0 1 0 1 4 4 1 3 8 7 0 0 5 5 6 6 0 0 5 0 0 8 2 0 0 7 0 3 0 0 0 1 7 6 25 25 3 Vertical Slits: IF and 2 Mass Slits (MS1,MS2) (cm/%) (cm) to purify kaon beam with 2 Electrostatic Separators
12-May-07 12-May-07 03:44:40 03:46:26 Histogram No 53 (lin) at z= 27.158 m (FF.x) Histogram No 55 (lin) at z= 27.158 m (FF.y) 100 Mean = 0.071 Mean = -0.001 140 RMS = 0.359 RMS = 0.204 90 Sum = 780 Sum = 785 80 120 Counts 70 Counts 100 60 80 50 40 60 30 40 20 20 10 0 0 -2 -1 0 1 2 -2 -1 0 1 2 y (cm) x (cm) σ X ~ 3.6 mm σ Y ~ 2 mm Beam Profile at FF
Optimization of Mass Slits (Heavy Alloy ~ 18.5g/cc) B B E E E MS1 MS2 π A A K Beam Beam D D C C F.P. F.P. Slit shape (mm) Intensity (rel.) A B C D E K pi mu K/all (1) MS1 2 250 200 5 150 MS2 732 176 108 2.6 BHK MS2 4 300 321 5 50 FF 429 20 124 3.0 (2) MS1 4 250 200 7 150 MS2 1387 3368 540 0.35 MS2 4 300 321 5 50 FF 783 728 324 0.74 (3) MS1 4 250 100 7 150 MS2 1196 5180 996 0.19 MS2 4 300 155 5 50 FF 668 500 476 0.68
Contour Plot No 40 (lin) at z= 22.629 m (MS2) 12-May-07 Contour Plot No 50 (lin) at z= 27.158 m (FFxy) 12-May-07 5 10 08:14:52 08:15:28 muons at MS2 muons at FF 4 8 Xmean = -1.838 Xmean = -1.894 3 6 Xrms = 7.363 Xrms = 3.064 Ymean = -0.128 Ymean = 0.176 2 4 Yrms = 0.661 Yrms = 3.013 Corr = -0.032 Corr = -0.010 Area/pi = 4.868 Area/pi = 9.231 1 2 Sum = 27 Sum = 31 0 0 y (cm) y (cm) -1 -2 -2 -4 -3 -6 K/(pi+mu)~3.0 K/(pi+mu)~2.6 -4 -8 -5 -10 -20 -10 0 10 20 -10 -8 -6 -4 -2 0 2 4 6 8 10 x (cm) x (cm) K1.1 ｃ (1) by B.H.Kang 12-May-07 12-May-07 08:34:19 08:35:38 Histogram No 45 (lin) at z= 22.629 m (MS2x) Histogram No 59 (lin) at z= 27.158 m (FF.y) 4 Mean = -0.234 Mean = 0.040 2.4 pions at MS2 RMS = 9.098 pions at FF RMS = 0.174 2.2 3.5 Sum = 5 Sum = 48 2 3 1.8 K/pi~4.2 K/pi~21 1.6 2.5 1.4 Counts Counts 2 1.2 1 1.5 0.8 1 0.6 0.4 0.5 0.2 0 0 -20 -10 0 10 20 -1 -0.5 0 0.5 1 x (cm) y (cm)
Contour Plot No 40 (lin) at z= 22.629 m (MS2) 12-May-07 Contour Plot No 50 (lin) at z= 27.158 m (FFxy) 12-May-07 5 10 04:12:42 04:14:00 muons at MS2 muons at FF 4 8 Xmean = 0.119 Xmean = -1.430 3 6 Xrms = 8.009 Xrms = 2.201 Ymean = 0.021 Ymean = -0.008 2 4 Yrms = 0.552 Yrms = 3.211 Corr = 0.004 Corr = 0.073 Area/pi = 4.421 Area/pi = 7.048 1 2 Sum = 135 Sum = 81 0 0 y (cm) y (cm) -1 -2 -2 -4 -3 -6 K/(pi+mu)~0.74 K/(pi+mu)~0.35 -4 -8 -5 -10 -20 -10 0 10 20 -10 -8 -6 -4 -2 0 2 4 6 8 10 x (cm) x (cm) K1.1 ｃ (2) 12-May-07 12-May-07 04:06:34 04:04:58 Histogram No 45 (lin) at z= 22.629 m (MS2x) Histogram No 53 (lin) at z= 27.158 m (FF.x) 60 30 Mean = 1.265 Mean = -0.506 pions at D3out RMS = 10.694 RMS = 0.780 Sum = 169 Sum = 842 pions at FF 50 25 40 20 K/pi~0.4 Counts Counts K/pi~1.1 30 15 20 10 10 5 0 0 -20 -10 0 10 20 -2 -1 0 1 2 x (cm) x (cm)
Contour Plot No 31 (lin) at z= 22.285 m (FGY6) 11-May-07 Contour Plot No 43 (lin) at z= 27.573 m (FGY8) 11-May-07 20 20 03:09:22 03:06:43 muons at D3out muons at FF Xmean = -4.711 Xmean = -1.979 Xrms = 7.457 Xrms = 2.643 10 10 Ymean = -0.024 Ymean = -0.020 Yrms = 2.566 Yrms = 0.752 Corr = -0.012 Corr = 0.195 Area/pi = 19.133 Area/pi = 1.950 Sum = 1763 Sum = 644 0 0 y (cm) y (cm) -10 -10 K/(pi+mu)~0.9 K/(pi+mu)~0.3 -20 -20 -20 -10 0 10 20 -20 -10 0 10 20 x (cm) x (cm) K1.8BR 11-May-07 11-May-07 03:41:36 03:39:13 Histogram No 32 (lin) at z= 22.285 m (FGD6) Histogram No 38 (lin) at z= 27.573 m (FGX8) 100 20 Mean = -7.769 Mean = -3.120 pions at D3out RMS = 11.655 RMS = 4.957 90 18 pions at FF Sum = 2040 Sum = 50 80 16 70 14 K/pi~0.6 60 12 Counts Counts K/pi~12 50 10 40 8 30 6 20 4 10 2 0 0 -30 -20 -10 0 10 20 30 -20 -10 0 10 20 x (cm) x (cm)
Performance Summary 2007.5.12 For 30 GeV-9 μ A primary protons K1.8BR K1.1c K1.1c on the 54mm Ni Target (BHK) (2) Length (m) 27.573 27.158 27.158 Acceptance (msr.%) 2.5 ¥ 1.2 2.1 K − Intensity (ppp)# 1.1 GeV/c 1.2E+06 0.6E+06 1.1E+06 0.8 GeV/c 0.2E+06 0.6 GeV/c 0.02E+06 Electro-static 500kV/10cm 750kV/10cm 750kV/10cm Separator 6m 2mx2 2mx2 Signles Rate @D3out(MS2) @1.1 GeV/c $ >7.7E+06 >1.4E+06 >7.4E+06 K − /( π − + μ − ) @ FF@1.1 GeV/c & 0.9 3.0 0.74 X/Y(FWHM) size @ FF (mm) 5.9/2.9 8.5/4.7 ¥ 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
Prospect � Further Optical Design � Collect D,Q,S,O-magnets Front-end part � ESS: Wien Filter Type → Radiation Resistant � Collimator � Vacuum � Shield
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