Design Note TRI-DN Low Energy Beam Transport Line for the CANREB Charge State Breeder

Transcription

1 Design Note Low Energy Beam Transport Line for the CANREB Charge State Breeder Document Type: Design Note Release: 03 Release Date: 2016/09/09 Author(s): S. Saminathan & R. Baartman Author(s): Reviewed By: Approved By: Name: S. Saminathan R. Baartman F. Ames R. Kruecken APPROVAL RECORD Note: Before using a copy (electronic or printed) of this document you must ensure that your copy is identical to the released document, which is stored on TRIUMF s document server. 1

2 Low Energy Beam Transport Line for the CANREB Charge State Breeder Document Release No. 03 Release Date: 2016/09/09 Release Number History of Changes Date Description of Changes Author(s) # Initial Release # # Updates on Nier-spectrometer optics by including DR committee s recommendations Injection beamline optics has been redesigned to accommodate the pulsed drift tube relocation. Also an update on Nier-spectrometer optics. S. Saminathan & R. Baartman S. Saminathan & R. Baartman S. Saminathan & R. Baartman Distribution: Friedhelm Ames, Rick Baartman, Brad Barquest, Jose Crespo (crespojr@mpi-hd.mpg.de), Jens Dilling, Eric Guetre, Rituparna Kanungo, Reiner Kruecken, Bob Laxdal, Dan Louie, Marco Marchetto, Norman Muller, Matt Pearson, Asita Perera, Doug Preddy, Dan Rowbotham, Michael Rowe, Victor Verzilov, Dimo Yosifov, Keywords: CANREB, Beam dynamics, Nier spectrometer, Injection beamline, EBIS beamline, CSB beamline, RIB transport, LEBT, Mass separator 2

3 Contents 1 Introduction Purpose and scope Definitions Abbreviations Requirements Injection beamline [1] Nier-spectrometer [2] Constraints Beam optics Injection beamline Nier-Spectrometer (NIS) Bending magnet Matching section Tolerances 29 5 Summary 29 3

4 Abstract The low energy beam transport line for the CANREB charge state breeder consists of two beamlines: (i) An injection beamline from a RFQ buncher to a charge state breeder for transportation of singly charged ion beams, and (ii) An extraction beamline, namely a Nier-spectrometer, for mass-over-charge selection. In this design note the beam optics design, beamline layout, element specifications and diagnostic requirements are documented. 1 Introduction An electron beam ion source (EBIS) is used as a charge state breeder to enhance the charge state of injected ion into a charge state at high level. The EBIS requires basically two low energy beam transport (LEBT) beamlines for ion beam injection and extraction. A schematic layout of the injection and the Nier-spectrometer (NIS) beamlines is shown in Fig. 1. The first part of the LEBT beamline is called the injection beamline, which will be used to transport a singly charged pulsed ion beam from an RFQ buncher into the EBIS. The second part of the beamline is called as the Nier-spectrometer (NIS). The NIS beamline will be used to transport the extracted beam from the EBIS as well as to separate the required highly charged ions from the the background of residual gas ions. A NIS consist of an electrostatic and a magnetic bender, which allows an achromatic mode of operation resulting in a high mass resolving power. The common beamline between the injection and the NIS beamline is called as the EBIS matching section. Function of the matching section is to match the incoming beams into the acceptance of the EBIS as well as to match the extracted beams from the EBIS into the acceptance of the NIS. For this purpose the optical elements in the matching section will be pulsed. 1.1 Purpose and scope Purpose of this design note is to provide some basic information about the functionality of both beamlines. Scope of this document is to present the conceptual design. 1.2 Definitions ˆ Coordinate system: Horizontal axis: x, vertical axis: y and beam axis: z. The initial beam parameters and the origin of the beamline are assumed at the location of AGTE:PM41 for the NIS (see Fig. 6). Whereas for the injection beamline the initial beam parameters and the origin of the beamline are assumed at the location of RFQ-exit (see Fig. 2). ˆ Energy slit (AGTC:SLIT7A): A set of slits is used in the NIS beamline (downstream to the 45 electrostatic bender) to limit the energy acceptance (see Fig. 1). ˆ Mass slit (AGTC:SLIT7B): A set of slits is used in the NIS beamline (downstream to the magnetic bender) to select the required m/q (see Fig. 1). 4

5 1.3 Abbreviations ˆ CANREB: CANadian Rare isotope facility with Electron Beam ion source. ˆ EBIS: Electron Beam Ion Source. ˆ LEBT: Low Energy Beam Transport. ˆ NIS: NIer-Spectrometer. ˆ AGTE: ARIEL Ground level Transport East. ˆ AGTC: ARIEL Ground level Transport Central. ˆ EQ: Electrostatic Quadrupole. ˆ MB: Magnetic Bender. ˆ EB-EFB: Electrostatic Bender s Effective Field Boundary. ˆ MB-EFB: Magnetic Bender s Effective Field Boundary. ˆ defx: Electrostatic deflector in the horizontal plane. ˆ RFQ: Radio Frequency Quadrupole. ˆ PDT: Pulsed Drift Tube. ˆ FC: Faraday Cup. ˆ PM: Profile Monitor. ˆ COL: COLlimator. 5

6 EBIS q 1+ q n+ defx-9 EB-36 EB-45 Pulse drift tube q 1+ EB-45 EB-45 Matching section Injection beamline Nier-spectrometer Vertical beamline 7800 q n+ q 1+ distance [cm] Energy slit MB-90 q n+ Mass slit RFQ Cooler/ Buncher q distance [cm] Figure 1: A schematic view of the injection and the Nier-spectrometer beamline on the ARIEL ground floor. Specified coordinates are with respect to the TRIUMF cyclotron center. 6

7 2 Requirements 2.1 Injection beamline [1] An injection beanline is required to transport a singly charged ion beams from the RFQ/Buncher through the PDT to the EBIS. The beamline should be capable of transporting ion beams with an emittance of 16 µm and beam energy between 10 kev to 60 kev. 2.2 Nier-spectrometer [2] An EBIS is used to produce highly charged ions of injected heavy-ion beams. Ion beams extracted from an EBIS consist of various mass-over-charge (m/q). The required m/q range will be 5 m/q 7 and the corresponding beam energy (E) range will be 10 qkev E 14 qkev. However, the dipole magnet should be designed to cover a m/q up to 50 for measuring charge state distributions both of the required ion beam and residual gas ions. The beamline should be capable of transporting the extracted ion beams with transverse emittance 16 µm and the energy spread less than 100 qev. The mass resolving power of the spectrometer for a beam defined as above should be M/ M > 200, with M including 90 % of the beam intensity of all ions with one mass to charge ratio. In order to allow the beam injection and extraction ion optical elements in the section between the EBIS and the first electrostatic bender have to be switchable. The frequency of the switching will be up to 100 Hz. The pulse length of a singly charged ions to be injected into the EBIS will be 1 µs and the pulse length of a highly charged ions coming out of the EBIS will be up to 1 ms. In order to minimize the charge exchange loss the vacuum in the dipole magnet has to be below torr. All the diagnostic elements have to be designed to handle the pulsed beams going in or coming out of the EBIS. The intensity range to be covered will range from several ions per second to average currents up to 1 µa. 2.3 Constraints ˆ Both beamlines have to fit into the overall design. ˆ Wherever possible ion optical and beam line elements shall use the same designs, which are used for similar elements within the CANREB project. ˆ All devices shall be controlled via the standard TRIUMF control system EPICS. 3 Beam optics The beam optics simulations were performed by using our in-house code TRANSOPTR and the final design of the NIS has been bench-marked with the code GIOS [3] and 7

8 COSY INFINITY [4] up to third-order. The optics calculations for the injection and NIS beamlines are described in Sec. 3.1 and Sec. 3.2, respectively. The optics calculations for various matching sections are described in Sec Injection beamline A schematic layout of the injection beamline is shown in Fig. 1. Recently it has been proposed that the PDT has to be detached from the RFQ buncher and should be installed downstream to the 90 bender [5, 6]. In order to accomodate its new location the injection beamline needs to be redisgned accordingly. The new beamline optics to accomodate the RFQ buncher and the PDT is reported in this design note. The injection beamline consists of three triplets and an achromatic 90 bend section consisting of two 45 spherical benders. The electrode geometries of the quadrupole and the spherical benders are similar to the ones used in the ISAC-LEBT beamline [7]. The initial beam parameters at the location of injection slits are shown in table. 1. The optics modules are designed in such a way that to achieve two different tunes according to the use of pulsed drift tube (PDT). Use of PDT may be not be required in case a 14 kv beam is transported through the RFQ buncher. In that case tune-1 can be used on order to transport the beam through long drift about 1 m at the location of PDT by using the triplets for point-to-parallel-to-point transfer. The calculated beam envelope for tune-1 is shown in Fig. 2. Use of PDT is required if the transported beam through the RFQ buncher is higher than the 14 kev. In this case the triplets are used as a doublet by turning of the third quadrupole in the first two triplets in order to match into the required beam parameter at the entrance of PDT as shown in table 2. This tune is called as tune-2 and the calculated envelope for the tune-2 is shown in Fig. 3. The extracted beam from the pulsed drift tube is shown in table 3. The downstream optics to the PDT consists of an Einzel lens and the focus is achieved at the location of AGTE:PM41 (see Fig. 4). Horizontal size of the beam [2 rms] (x) Horizontal size of the beam divergence [2 rms] (x ) Vertical size of the beam [2 rms] (y) Vertical size of the beam divergence [2 rms] (y ) 5.6 mm 6.7 mrad 5.6 mm 6.7 mrad Correlation parameter in horizontal plane (r12) Correlation parameter in vertical plane (r34) Emittance [4 rms] (ε) 20.0 µm Table 1: Initial beam parameters for the injection beamline at the location of RFQ exit [5] (see Fig. 1). 8

9 Horizontal size of the beam [2 rms] (x) 1.9 mm Horizontal size of the beam divergence [2 rms] (x ) 16.0 mrad Vertical size of the beam [2 rms] (y) 1.9 mm Vertical size of the beam divergence [2 rms] (y ) 16.0 mrad Correlation parameter in horizontal plane (r12) Correlation parameter in vertical plane (r34) Emittance [4 rms] (ε) 20.0 µm Table 2: Required beam parameters at the location of PDT entrance [6] (see Fig. 1). Horizontal size of the beam [2 rms] (x) 5.8 mm Horizontal size of the beam divergence [2 rms] (x ) 10.0 mrad Vertical size of the beam [2 rms] (y) 5.8 mm Vertical size of the beam divergence [2 rms] (y ) 10.0 mrad Correlation parameter in horizontal plane (r12) Correlation parameter in vertical plane (r34) Emittance [4 rms] (ε) 20.0 µm Table 3: Required beam parameters at the location of PDT exit [6] (see Fig. 1). 9

10 RFQ exit XY-steerer25 FC-PM25 EQ26 EB-ent. EB26 EB-exit EQ27 EQ28 PM28 EQ29 EQ30 EB-ent. EB30 EB-exit EQ31 FC31 XY-steerer31 EQ32 EQ33 EQ34 XY-steerer34 EQ35 EQ36 EQ37 FC-PM37 XY-steerer37 EQ38 EQ39 EQ40 PM40 PDT-ent x-envelope (cm) y-envelope (cm) Energy dispersion (m) focal power (arb.) distance (m) Figure 2: Calculated beam envelope (2 rms) and energy dispersion for 14 kev ion beam through the injection beamline with ε = 16 µm. 10

11 RFQ exit XY-steerer25 FC-PM25 EQ26 EB-ent. EB26 EB-exit EQ27 EQ28 PM28 EQ29 EQ30 EB-ent. EB30 EB-exit EQ31 FC31 XY-steerer31 EQ32 EQ33 EQ34 XY-steerer34 EQ35 EQ36 EQ37 FC-PM37 XY-steerer37 EQ38 EQ39 EQ40 PM40 PDT-ent x-envelope (cm) y-envelope (cm) Energy dispersion (m) focal power (arb.) distance (m) Figure 3: Calculated beam envelope (2 rms) and energy dispersion for 60 kev ion beam through the injection beamline with ε = 16 µm. 11

12 PDT-exit xy-steerer40 EL-ent. EL41 EL-exit D41 PM x-envelope (cm) y-envelope (cm) focal power (arb.) distance (m) Figure 4: Calculated beam envelope (2 rms) for 14 kev ion beam through the injection beamline with ε = 16 µm. 12

13 Name Tune-1 [kv] Tune-2 [kv] R [cm] L [cm] s [cm] x [cm] y [cm] z [cm] θ [deg.] RFQ-exit XY-steerer FC-PM EQ EB-ent EB EB-exit EQ EQ PM EQ EQ ent EB-EB exit EQ FC XY-steerer EQ EQ EQ XY-steerer EQ EQ EQ FC-PM XY-steerer EQ EQ EQ PM PDT-ent Table 4: The coordinates (x, y, z) coressponds to the local position of the mid-point of the each optical element and diagnostic device in the injection beamline (AGTE). The 2nd and 3rd column specifies the quadrupole strength in kv for 14 kv and 60 kv ion beams, respectively. The 4th and 5th column specifies the radius (R) and length (L) of the quadrupole in millimeter. The 6th column (s) is the reference trajectory length in millimeter. The 10th column (θ) specifies the bending angle in degree. 13

14 Name Potential [kv] R [cm] L [cm] s [cm] x [cm] y [cm] z [cm] θ [deg.] PDT-exit XY-steerer EL-entr EL EL-exit defx-d PM Table 5: The coordinates (x, y, z) coressponds to the local position of the mid-point of the each optical element and diagnostic device in the injection beamline (AGTE). The 2nd column specifies the Einzel lens strength in kv for 14 kv ion beam. The 3rd and 4th column specifies the radius (R) and length (L) of the Einzel lens in millimeter. The 5th column (s) is the reference trajectory length in millimeter. The 9th column (θ) specifies the bending angle in degree. 14

15 3.2 Nier-Spectrometer (NIS) A NIS consists of an electrostatic and a magnetic dipole element. In our case it contains additional focusing elements in between the dipoles. The electrostatic bend compensates the energy dispersion of the magnetic bend. This allows an achromatic mode of operation resulting in a high mass resolving power even for beams with a high energy spread as in the case of extracted beams from an EBIS. In the case of an extraction voltage of 20 kv, the highest expected energy spread is up to 100 V (i.e., δ E = 0.25 %). The required mass resolving power is about 200 (i.e., δ m = 0.5 %). A schematic layout of the NIS beamline is shown in Fig. 1. The geometry of the electrostatic optical elements is similar to the optical elements used in the ISAC-LEBT beamline. The requirement of the bending magnet is briefly described in Sec and a detail design requirement can be found in the Ref. [8]. Maximal mass deviation (δ m ) 0.5 % Energy deviation (δ E [2 rms]) at 20 qkev 0.25 % Horizontal size of the beam [2 rms] (x) 2.0 mm Horizontal size of the beam divergence [2 rms] (x ) 8.0 mrad Vertical size of the beam [2 rms] (y) 2.0 mm Vertical size of the beam divergence [2 rms] (y ) 8.0 mrad Correlation parameter in horizontal plane (r12) 0.0 Correlation parameter in vertical plane (r34) 0.0 Emittance [4 rms] (ε) (16 µm) Table 6: Initial beam parameters for the NIS at the location of PM41 (see Fig. 6). The system has been calculated to first-order with the code TRANSOPTR and also it has been bench-marked with the code GIOS and COSY INFINITY up to third-order. The initial beam parameters are assumed at the location of the AGTE:PM41 as shown in table 6. The calculated beam envelope and energy dispersion for the NIS by using the code TRANSOPTR is shown Fig. 6. Fig. 5 shows the calculated ion trajectories through the beamline for three different mass with a mass difference of δ m = ± 0.5 %. An adjustable horizontal slit (energy slit) can be used to define the energy acceptance to δ E 0.25 %. The energy slit will be installed at the first focal point, which is about mm upstream to the entrance edge of the bending magnet (see Fig. 1). In order to select a required m/q another slit will be installed at the location of the second focal point, which is about mm downstream to the exit edge of the bending magnet (see Fig. 1). 15

16 Figure 5: Nier-Spectrometer layout with the calculated ion trajectories (for δ E = ± 0.25 % and δ m = ± 0.5 %) by using the code GIOS. 16

17 FC-PM41 defx-d41 EB-ent. EB1 EB-exit EQ1 PM1 EQ2 EB-ent. EB2 EB-exit EQ3 XY-steerer3 FC-PM3 EQ4 EQ5 PM5 XY-steerer5 EQ6 EQ7 SLIT7A Y-steerer7A MB-ent. MB0 MB-exit SLIT7B FC-PM7B x-envelope (cm) y-envelope (cm) Energy dispersion (m) Mass dispersion (m) focal power (arb.) distance (m) Figure 6: Calculated beam envelope (2 rms) and energy dispersion for 266 kev 133Cs 19+ ion beam through the NIS with ε = 16 µm. 17

18 Calculated spatial distribution at the location of the mass slit by using the code GIOS is shown in Fig. 7. For the same beam the horizontal and the vertical phase-space distributions are shown in Fig. 8 and 9, respectively. At the location of the mass slit the first-order optics calculation shows a linear magnification of (x x) = 0.75, a energy dispersion of (x δ E ) 0 and a mass dispersion of (x δ m ) = m. In the linear approximation: 1. Energy resolving power at the location of energy slit, R K = (x δ E) 2(x x)w 192 (1) where (x δ E ) = m is the energy dispersion, (x x) = 0.80 is the magnification, and W = m is the half width of the source slit. 2. Mass resolving power at the location of mass slit, R m = (x δ m) 2(x x)w 205 (2) where (x δ m ) = m is the mass dispersion, (x x) = 0.75 is the magnification, and W = m is the half width of the source slit. 18

19 24 x-p x 16 8 mrad mm Figure 7: Calculated phase-space profiles in the horizontal plane at the location of mass selection slit AGTC:SLIT7B (see Fig. 1 or 6) for a 14 kv beam with δ E = ± 0.25 % and δ m = ± 0.5 % by using the code COSY INFINITY. 19

20 24 16 x-p x ǫ = 32 µm ǫ = 16 µm ǫ = 8 µm 8 mrad mm Figure 8: Calculated phase-space profiles for various beam emittances in the horizontal plane at the location of mass selection slit AGTC:SLIT7B (see Fig. 1 or 6) for a 14 kv beam with δ E = ± 0.25 % and δ m = ± 0.5 % by using the code COSY INFINITY. 20

21 24 16 y-p y ǫ = 32 µm ǫ = 16 µm ǫ = 8 µm 8 mrad mm Figure 9: Calculated phase-space profiles for various beam emittances in the vertical plane at the location of mass selection slit AGTC:SLIT7B (see Fig. 1 or 6) for a 14 kv beam with δ E = ± 0.25 % and δ m = ± 0.5 % by using the code COSY INFINITY. 21

22 Resolving power Emittance [ µm] Figure 10: Calculated mass resolving power at the location of mass selection slit in the Nierspectrometer for various beam emittance Bending magnet Magnet type Bending angle (θ) Pole face rotation angle (entrance and exit) Bending radius (ρ) Full air gap (Non-bend plane) Maximum field strength (B max ) Field homogeneity ( Bdl)/( Bdl) (see Fig. 12) Rotated pole face mm 60.0 mm T Table 7: Summary of the basic magnet requirements. From the rigidity and bending angle (θ), the required field integral is: + The increment dl is taken along the ion trajectory. Bdl = (Bρ) max θ [T m] (3) 22

23 Figure 11: Vertical cross-section at the magnet center. Measurements in mm. Figure 12: Plan view of magnet pole in the horizontal plane. Measurements in mm and degree. 23

24 Name Pot. [kv] R [mm] L [mm] s [mm] x [mm] y [mm] z [mm] θ [deg.] FC-PM defx-d EB-ent EB EB-exit EQ PM EQ EB-ent EB EB-exit EQ XY-steerer FC-PM EQ EQ PM XY-Steerer EQ EQ SLIT7A Y-Steerer7A MB-ent MB MB-exit SLIT7B FC-PM7B Table 8: The coordinates (x, y, z) coressponds to the local position of the mid-point of the each optical element and diagnostic device in the NIS beamline (AGTE and AGTC). The 2nd column (pot.) specifies the quadrupole strength in kv for 14 kv ion beam. The 3rd and 4th column specifies the radius (R) and length (L) of the quadrupole in millimeter. The 5th column (s) is the reference trajectory length in millimeter. The 9th column (θ) specifies the bending angle in degree. 24

25 3.3 Matching section The CANREB CSB beamline consists of various matching sections:ebis matching, Nier exit matching and RFQ entrance matching (see Fig.1). The beam optics design for the EBIS matching section, i.e. the optics between AGTE:EBIS and AGTE:PM41 is not documented in this design note. This work is in progress with the simulation results obtained from the EBIS injection/extraction simulations. The EBIS matching section will be designed in such a way that the incoming beams to the EBIS and the outgoing beams from the EBIS are matched properly to their respective beamline. This will be achieved by pulsing the optical elements in this matching section. In order to kick the extracted beam from the EBIS to the NIS, an electrostatic deflector (AGTE:defx-D41) is used by modifying a single 45 bender, splitting it into a 9 electrostatic deflector and 36 spherical bender [7]. The calculated beam envelope for the beamline that connects the NIS and ARIEL RIB beamline is shown in Fig. 13. Required beam parameter at the entrance RFQ buncher is shown in table 10. Fig. 14 shows the calculated beam envelope for the beamline that connects ARIEL RIB beamline and the RFQ buncher. Name Pot. [kv] R [mm] L [mm] s [mm] x [mm] y [mm] z [mm] SLIT7B FC-PM7B XY-steerer7B EQ EQ EQ EQ PM Table 9: The coordinates (x, y, z) coressponds to the local position of the mid-point of the each optical element and diagnostic device in the matching section downstream to the NIS beamline (AGTC). The 2nd column (pot.) specifies the quadrupole strength in kv for 14 kv ion beam. The 3rd and 4th column specifies the radius (R) and length (L) of the quadrupole in millimeter. The 5th column (s) is the reference trajectory length in millimeter. 25

26 SLIT7B FC-PM7B XY-steerer7B EQ8 EQ9 EQ10 EQ11 PM x-envelope (cm) y-envelope (cm) focal power (arb.) distance (m) Figure 13: Calculated beam envelope (2 rms) and energy dispersion for 20 kev ion beam through the NIS with ε = 16 µm. 26

27 XY-Steerer21 EQ22 EQ23 FC-PM23 EQ24 EQ25 RFQ ent x-envelope (cm) y-envelope (cm) focal power (arb.) distance (m) Figure 14: Calculated beam envelope (2 rms) and energy dispersion for 20 kev ion beam through the injection beamline with ε = 16 µm. 27

28 Maximum beam energy 60 kev Horizontal size of the beam [2 rms] (x) 5.3 mm Horizontal size of the beam divergence [2 rms] (x ) 4.7 mrad Vertical size of the beam [2 rms] (y) 5.3 mm Vertical size of the beam divergence [2 rms] (y ) 4.7 mrad Correlation parameter in horizontal plane (r12) Correlation parameter in vertical plane (r34) Emittance [4 rms] (ε) 20.0 µm Table 10: Required beam parameters at the location of RFQ buncher entrance [5] (see Fig. 1). Name Pot. [kv] R [mm] L [mm] s [mm] x [mm] y [mm] z [mm] XY-Steerer EQ EQ FC-PM EQ EQ RFQ-ent Table 11: The coordinates (x, y, z) coressponds to the local position of the mid-point of the each optical element and diagnostic device in the matching section upstream to the RFQ buncher (AGTE). The 2nd column (pot.) specifies the quadrupole strength in kv for 14 kv ion beam. The 3rd and 4th column specifies the radius (R) and length (L) of the quadrupole in millimeter. The 5th column (s) is the reference trajectory length in millimeter. 28

29 4 Tolerances The integrated field along the beam path must be no larger than about 90 gauss cm. The local ambient field bumps should be less than 1 gauss. Tolerances for the transverse positioning of the nier dipole magnet (AGTC:MB0) should be less than 1 mm. Mechanical and electrical tolerances for the electrostatic elements can be similar to the specified tolerance for electrostatic elements used in the ARIEL RIB transport [9]. 5 Summary Beam optics design for a Nier-spectrometer has been done to achieve a resolving power of 200 for a given emittance of 16 µm at an extraction potential of 14 kv. Injection beamline optics has been redesigned to accommodate the PDT at the proposed location, i.e. downstream to the 90 achromatic section. Beam optics calculations also includes the required matching sections for the CANREB CSB beamline. Optical elements and its design details are presented. References [1] J. Dilling, CANREB RFQ Buncher, Document-92050, Internal report, TRIUMF, July, [2] F. Ames, CANREB Nier-spectrometer, Document-91140, Internal report, TRIUMF, July, [3] H. Wollnik et al., Nucl. Instr. and Meth. A 258 (1987) 408. [4] M. Bertz et al.,, COSY INFINITY Version 8.1, see [5] B. Barquest, CANREB RFQ Beam Cooler, TRI-DN-15-07, Internal report, TRI- UMF, July, [6] B. Barquest, Design note for pulsed drift tube relocation, TRI-DN-16-10, Internal report, TRIUMF, April, [7] R. Baartman, ISAC LEBT, TRI-BN-12-10, Internal report, TRIUMF, July, [8] S. Saminathan, Dipole magnet requirements for Nier-Spectrometer, TRI-DN-15-09, Internal report, TRIUMF, Jan., [9] M. Marchetto, and S. Saminathan, ARIEL Front-End Design Note, Document , Internal report, TRIUMF, June,