Beam Line Alignment Richard Catherall EN-STI

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Presentation transcript:

Beam Line Alignment Richard Catherall EN-STI ISOLDE Technical Coordinator ISCC meeting 28th June 2016

ISOLDE Lines - Survey Results Measurements of November/December 2012 Isolde Lines Survey Results – meeting 15.01.2013

Isolde Lines Survey Results – meeting 15.01.2013 RESULTS – vertical plane ~ 10mm step Zavg = 437.0172m Dev: -1.5mm to +1.5mm Zavg = 437.0073m Dev: -1.8mm to +1.1mm Isolde Lines Survey Results – meeting 15.01.2013

Isolde Lines Survey Results – meeting 15.01.2013 RESULTS – vertical plane Isolde Lines Survey Results – meeting 15.01.2013

RESULTS – horizontal plane main line CA0 – CD0 Line: CA0-CB0-CC0-CD0 Bearing [g]: 351.4005 Name X [m] Y [m] Distance to line [mm] CA0_Q_E 1879.3962 2239.1236 -0.1 CA0_Q_S 1878.7661 2239.7807 -1.1 CB0_Q1_E 1877.3575 2241.2535 -0.6 CB0_Q1_S 1876.7272 2241.9131 0.1 CB0_Q2_E 1874.9036 2243.8206 1.4 CB0_Q2_S 1874.2733 2244.4785 0.9 CC0_Q1_E 1872.8599 2245.9545 0.2 CC0_Q1_S 1872.2301 2246.6140 1.2 CC0_Q2_E 1871.3751 2247.5059 0.0 CC0_Q2_S 1870.7443 2248.1640 -0.7 CD0_Q1_E 1869.3341 2249.6383 -0.3 CD0_Q1_S 1868.3920 2250.6219 -0.9 Deviation scale 500:1 Relatively to the scale along the beam Isolde Lines Survey Results – meeting 15.01.2013

RESULTS – horizontal plane bearings comparison Line Theoretical Bearing Calculated Difference Calc-Theo [g] [cc] CA0-CB0-CC0-CD0 351.4121 351.4005 -116 LA1 245.8565 245.8974 409 LA2 279.1898 279.2213 315 LA0-LA3 312.5232 312.4988 -244 LC0 312.5030 -202 RA0 390.2997 390.3080 83 RB0 390.3010 390.2699 -311 RC0-RC2-RC6 390.2941 -69 RC3 29.1899 29.1670 -229 RC4 323.6343 323.6108 -235 10cc ~ 0.16 mm/10m +409cc Theoreticl Bearing Calculated Bearing +315cc -244cc -116cc +83cc -202cc LC0

MADX simulations Distorted beam line without correction Distorted beam line with correction

MADX simulations summary The result of this study shows that the transmission of the transfer lines can be recovered by using the correction power of the available steering quadrupoles. This is a rather fortunate situation because a misalignment in the horizontal direction would have been more difficult to handle due to the fact that the horizontal apertures of the elements are smaller. After tuning for 8 hours, one could achieve a transmission from CA0 to RC4 of around 80% to 90% (at 50kV). Acceptance study of the ISOLDE beam lines with MAD-X https://edms.cern.ch/document/1688599/1 E.Rapisarda, M.A. Fraser, J. Kurcewicz, D. Voulot