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Experimental proposal to study emittance growth in the existing ATF EXT

Experimental proposal to study emittance growth in the existing ATF EXT. Seryi, M. Woodley, and F. Zhou SLAC. 08/30/07. Outline. Motivation: to look for emittance growth source, and check how well the coupling correction… Generation of local bumps in the EXT and to see the effects.

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Experimental proposal to study emittance growth in the existing ATF EXT

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  1. Experimental proposal to study emittance growth in the existing ATF EXT • Seryi, M. Woodley, and F. Zhou SLAC 08/30/07

  2. Outline • Motivation: to look for emittance growth source, and check how well the coupling correction… • Generation of local bumps in the EXT and to see the effects. • Close the ring orbit • Hardware requirements: an additional vertical corrector only. 08/30/07

  3. EXT local bump generation Q6, Q7, and septum1-3 08/30/07

  4. More close… ZV9R ZH9R V1 – add by us H1- add by Naito ZX1X ZV1X 08/30/07

  5. Either x or y offset: vertical normalized emittance growth(W/o any correction) • Either x or y offset in the existing EXT channel • Includes QM7+Septum1 multipoles X=0 (nominal) Y=0 (nominal) y (nm) y (nm) X (mm) Y (mm) 08/30/07

  6. Combined x and y offset: vertical emittance growth • Combined x and y offset in the EXT channel • QM7+Sep1 multipoles. x w/o correctionx w/ correction y (nm) y (nm) 40 30 X=5 mm Y=1 mm X (mm) Y (mm) 08/30/07

  7. Vertical phase spaces at EXT end  x/y=0/0, no multi x/y=-5/1mm, w/o correction  x/y= 5/1mm, w/o correction  x/y=0/0,no multi x/y=5/0mm, w/o correction  x/y=0/1mm, w/o correction  x/y=0/0,no multi x/y=5/1mm, w/o correction  x/y=5/1mm, w/ correction y’ y’ y y 08/30/07

  8. Close the ring orbit wiggler off ZV9R ZH9R ZH11R ZV11R ZH10R ZV10R At EXT line: X=5mm y =1.5mm 4-6mm 08/30/07

  9. Beam experiment • Observe the effects vs different bump amplitude; it can help us to understand the emittance growth source, and also how well the coupling correction: • Only x or y bumps • W/o correction • W/ correction • Combined x+y bumps • W/o correction • W/ correction • Total 6 correctors needed to generate local bumps; 4 correctors (2 H and 2 V) already exist, another H corrector probably already exists. 08/30/07

  10. H corrector, install by Summer 2007? Naito ATF TN, May 2007 V corrector, need to install for this test 08/30/07

  11. Stripline kicker test layout can we rotate it for V corrector? for H corrector

  12. Requirements • Only 1 vertical correctors need to be installed or just rotate a H corrector assume strip-line kicker experiment install all other horizontal correctors by summer 2007. • Corrector parameters: • Horizontal 5 mm offset (ok if stripline kicker experiment ready) • 1.5mrad (max); • B*L=6E-3 T.m; B~0.14 T assume L=5cm • Vertical offset 1.5 mm offset • 0.3 mrad (max) • B*L=1.3E-3 T.m; B<0.03 T assume L=5 cm • Spaces look available but need check with KEK • Strip-line Kicker experiment: • Bending angle: 9mrad(max) • Effective length 100mm, and 0.4 T (max) • Power supply: 50A(MAX), 10V(pulse) 08/30/07

  13. Summary • Initial y is 30 nm. Final emittance and phase spaces are measured at the existing EXT end. No magnet errors employed except the QM7 and Septum1 multipoles. • Tracking results: • At the nominal position: only x-offset does not create vertical emittance growth while only y-offset create vertical emittance growth w/o corrections. • Combined both x and y offsets create severe vertical emittance growth w/o corrections; combined offsets x/y=5/1mm and 5/1.5mm can create 30% and 50% vertical emittance growth after all corrections. • The beam test will be helpful to understand the emittance growth source and also how well the coupling correction. • What we require: • need 1 more vertical corrector or even just rotate 1 H corrector for V corrector assume the stripline experiment is ready; • Beam time: probably two runs (test run and 2nd run for data taking)?? 08/30/07

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