Beam Commissioning of GRIFFIN Beam Line

Document-8677 Beam Commissioning of GRIFFIN Beam Line Document Type: Beam Commissioning Note Release: Release Date: 5--5 Author(s): S. Saminathan, R. Baartman 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. 55 Template: Document-887 Rel.

Beam Commissioning of GRIFFIN Beam Line Document-8677 Release No. Release Date: 5--5 Release Number Date History of Changes # 5--5 Initial release Description of Changes Author(s) S. Saminathan R. Baartman 55 Template: Document-887 Rel.

Document-8677 Release No. Beam Commissioning of GRIFFIN Beam Line Release Date: 5//5 Abstract In this note we briefly report the beam development test conducted for ISAC-GRIFFIN beamline. Main objective is to demonstrate/develop a tune with calculated optical settings. Measured beam profiles and current readings at various locations are presented. Method We have used beams from OLIS-MWS (see Table ) for the beam development through the GRIFFIN beamline (see Fig. ). Quadrupoles from ILEB:Q6 to ILEB:Q are used to focus the beam at the location of slit ILEB:XYSLIT and the quadrupoles ILEB:Q to ILEB:Q6 images the beam spot from ILEB:XYSLIT (i.e., focus-toparallel-to-focus) to the target location (ILEB:FC8). A detail beam optics note can be found in Ref. [] and a detailed beamline commissioning report can be found in Ref. []. For an initial emittance of ε = µm the calculated full width (horizontal and vertical) of the beam spot at the location of the slit ILEB:XYSLIT is. mm ( RMS) and at the location of slit ILEB:XYSLIT is. mm ( RMS). We begin the tune by setting all the optical elements (from IOS:Q6 to ILEB:Q6) to the calculated values. Ion source OLIS-MWS IOS:Bias 8 V IOS:EE V IOS:MB Current. A IOS:MB Field 55.5 G IOS:MB M/Q. IOS:MCOLA.5769 IOS:MCOLB.86 IOS:FC6.8 na ILE:FC5.98 na ILE:FC5.9 na Table : Beam from the ion source. 55 Template: Document-887 Rel.

Document-8677 Release No. Beam Commissioning of GRIFFIN Beam Line Release Date: 5//5 Figure : Layout of the GRIFFIN beamline (ILEB) at ISAC. 55 Template: Document-887 Rel.

Document-8677 Release No. Beam Commissioning of GRIFFIN Beam Line Release Date: 5//5 Measured beam profiles by RPM (ILE:RPM9, ILE:RPM, ILE:RPM) in the period section (ILE) are shown in Fig.. The measured beam size ( RMS) in the periodic section was around.5 mm and β = m for a matched beam through the periodic section. From the beam size and β value the estimated beam emittance through this section was ε µm. The ILEB section was re-optimized for the estimated emittance of ε µm and the calculated quadrupole settings were used to transport the beam through the ILEB section (tune 5-8.snapiosgriffin). Calculated beam envelope and the measured beam size by the RPMs are shown in Fig.. Measured beam currents in the ILEB section are shown in Table. The transmission from ILEB:FC6 to ILEB:FC8 was around 8 % with slit ILEB:XYSLIT at 5 mm and slit ILEB:XYSLIT at 7 mm. The diameter of the collimator (ILEB:COL8ACI) is 5 mm. The ratio of current readings at ILEB:COL8ACI to ILEB:FC8 was less than 5 %. The measured beam profiles in the ILEB section are shown in Fig.. 8 ILE:RPM9 7 6 5.5.5 (a) ILE:RPM9.5 ILE:RPM 5 ILE:RPM.5.5.5.5.5.5.5 (b) ILE:RPM (c) ILE:RPM Figure : Measured beam profiles (Horizontal profile left blue curve and vertical profile right blue curve) by using RPMs. 5 55 Template: Document-887 Rel.

Document-8677 Release No. Beam Commissioning of GRIFFIN Beam Line Release Date: 5//5 StRt Q6. Q7. Q8. Q9. Q. COL Q. Q. Q. Q. delt COL delt Q6. Q5. Q5. Q6. - - - x-envelope (cm) y-envelope (cm) focal strength measured in X-plane (cm) measured in Y-plane (cm) 5 5 distance (in) Figure : Calculated beam envelope for 8 kev Ar + beam through the GRIFFIN beamline (IELB). 6 55 Template: Document-887 Rel.

Document-8677 Release No. Beam Commissioning of GRIFFIN Beam Line Release Date: 5//5 Quadrupole Calculated [V] Tune [V] ILEB:Q6 9 9 ILEB:Q7 787 787 ILEB:Q8 677 677 ILEB:Q9 65 65 ILEB:Q ILEB:Q 9 9 ILEB:Q 855 855 ILEB:Q5 9 9 ILEB:Q6 89 89 Table : Quadrupole settings used in the tune 5-8.snapiosgriffin ILEB:FC6 ILEB:FC ILEB:FC6 ILEB:FC8CI ILEB:COL8ACI 6.8 na.69 na. na.5 na.95 na Table : Beam current measured by the Faraday cup. 7 55 Template: Document-887 Rel.

Document-8677 Release No. Beam Commissioning of GRIFFIN Beam Line Release Date: 5//5 8 ILEB:RPM 6.5.5 (a) ILEB:RPM.5 ILEB:RPM5.5 ILEB:RPM8.5.5.5.5.5.5.5 (b) ILEB:RPM5.5.5.5 (c) ILEB:RPM8 ILEB:RPM.5 ILEB:RPM.5.5 (d) ILEB:RPM.5.5.5.5 (e) ILEB:RPM Figure : Measured beam profiles (Horizontal profile left blue curve and vertical profile right blue curve) by using RPMs (ILEB:RPM to ILEB:RPM). In this measurement the steerers are tuned to align the beam on the RPMs (tune:5-8.snapiosgriffin). 8 55 Template: Document-887 Rel.

Document-8677 Release No. Beam Commissioning of GRIFFIN Beam Line Release Date: 5//5 Figure 5: ILEB slits readings (tune:5-8.snapiosgriffin). 9 55 Template: Document-887 Rel.

Document-8677 Release No. Beam Commissioning of GRIFFIN Beam Line Release Date: 5//5 References [] R. Baartman, GRIFFIN OPTICS, TRI-BN--, TRIUMF, July,. [] G. Ball, Commissioning Report - ILEB-GRIFFIN Optics, Diagnostics, and Vacuum, Document-65, TRIUMF, April, 5. 55 Template: Document-887 Rel.