Status and Motivation for
Present BI-TL Design
C. Bracco
Status: Baseline
- QN30 and QN40 (off-centred  SBENDS) used together with DVT30 to create the 5.2 mm bump at the DIS
kdvt30 := 0.001749513;
kbiqn1_30 := -1.0409885 (kbiqn1_s30 := -0.000711808);
kbiqn1_40 := 1.0702251 (kbiqn1_s40 := 0.002461321);
kdis3 := - 0.00365;
kdis4 := -0.00362;
kdvt3 := 0.00727;
5.19 mm
Motivation for bump at DIS:
Need an offset at the DIS to inject beam straight into Ring 3!
Why using quads: no documentation available…. (Magnet
strength? Limited space and geometric constraints? Cost
reduction? 4 kickers-like bump?)
Optics – Nominal Beta & Matched Dispersion
Max Db = 2 m
Max Da = 0.5 rad
BI.QN10 -1.04465
BI.QN20 1.01876
BI.QN30 -1.04099
1.07022
BI-QN40
5
BI-QN50 -1.95651
2.20906
BI-QN60
1
Max Db = 0.6 m
Max Da = 0.5 rad
Max DD = 0.1 m
Max DD = 0.5 m
EDMS 1178044
PSB Injection Geometry for DIS Magnets for D = 0
DVT
80
Vertical beam offset at BI.DIS
Baseline
parameters
5.2 mm
Proposed
parameters
5.7mm
DIS0 Deflection
-3.42 mrad
-3.77 mrad
DIS1 Deflection
-3.88 mrad
-4.23 mrad
DIS2 Deflection
-3.49 mrad
-3.84 mrad
-40
DIS3 Deflection
-3.65 mrad
-4.00 mrad
-60
DIS4 Deflection
-3.62 mrad
-3.97 mrad
DVT40 Deflection
+7.27 mrad
+7.97 mrad
SMV1 Deflection (beam 1)
-165.95 mrad
-163.7 mrad
SMV2 Deflection (beam 2)
-131.35 mrad
-129.6 mrad
SMV3 Deflection (beam 4)
+131.15 mrad
+129.5 mrad
60
DIS0
DIS1
DIS2
DIS3
Equipment
DIS4
Amplitude [mm]
40
20
6.02
4
0
-4.78
-12.1
-20
-80
-20.2
5.4632
5.5042
5.5452
5.5862
5.6272
5.678
Drift Space [mm]
x 10
SMV2
200
Amplitude [mm]
4
100
0
-100
-200
-300
5.4
SMV1
5.6
5.8
6
Drift Space [mm]
6.2
6.4
6.6
x 10
4
Status: Proposed
- QN30 and QN40 (off-centred  SBENDS)
5.7 mm
kdvt30 := 0.002005142 (15%);
kbiqn1_30 := -1.04099006 (kbiqn1_s30 := -0.000608024) ;
kbiqn1_40 := 1.070226193 (kbiqn1_s40 := 0.002613166);
kdis3 := - 0.00400;
kdis4 := -0.00397;
kdvt3 := 0.00797;
No impact on the optics!
All angles and beam positions at the downstream elements
(DVT40, SMV, BVT ) depend on offset and angle at DIS 
any change in the upstream part must not affect the
downstream elements, the optics and flexibility (aperture
along the line and optics functions at stripping foil)!
Proposed
Parameters
From MADX calculations:
SMV1 entrance= -66.40 mm
SMV1 exit = -152.81 mm
SMV2 entrance= -35.93 mm
SMV2 exit = -101.87 mm
SMV2 entrance= 35.89 mm
SMV2 exit = 101.89 mm
From MADX calculations:
BVT_R4 entrance= 311.11mm
BVT_R4 exit = 360.17 mm
BVT_R3 entrance= 0 mm
BVT_R3 exit = 0 mm
BVT_R2 entrance= -310.80mm
BVT_R2 exit = -359.77 mm
BVT_R1 entrance= -656.60 mm
BVT_R1 exit = -719.57 mm
Kick [mrad]
BVT Ring 4
-133.5
BVT Ring 3
0
BVT Ring 2
133.44
BVT Ring 1
171.77
Conclusion
• Any change in the present BI line must not affect:
• Beam position and angle at element downstream of DIS (in particular SMV
and BVT, need for orthogonal steering?)
• Optics at the stripping foil (flexibility: different beta, fully matched, 0
dispersion, etc.)
• Available aperture in the line (in particular DIS, SMV, BVT)
• The impact on existing HW (available magnet and PC strength) has to
be checked!
• Any proposal fulfilling the previous constraints and allowing for more
flexibility in optics and steering is welcome!
Backup slides
Beam Envelope
4 sbx,y(+20%) + Dx,y*Dp/p + Orbit
(normalized r.m.s. ey =0.5 mm mrad)
Dp/p = 0.0044 (1.13 MeV longitudinal painting)
Orbit = ±2 mm
Beam Envelope
4 sbx,y(+20%) + Dx,y*Dp/p + Orbit
(normalized r.m.s. ey =0.5 mm mrad)
Dp/p = 0.0044 (1.13 MeV longitudinal painting)
Orbit = ±2 mm