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NuMI Horn & Target Alignment

NuMI Horn & Target Alignment. A.E.M. 9 Sept., 2013 Jim Hylen / FNAL. Labor day weekend: target installation !. Primary beam line: new quad magnets, new profile monitors, Beam Position Monitor nearest target dismounted and re-installed. Baffle.

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NuMI Horn & Target Alignment

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  1. NuMI Horn & Target Alignment A.E.M. 9 Sept., 2013 Jim Hylen / FNAL Labor day weekend: target installation !

  2. Primary beam line: new quad magnets, new profile monitors, Beam Position Monitor nearest target dismounted and re-installed Baffle New hadron monitor Horn 2 moved 9 m downstream Horn 1 new for 700 kw operation New style target for NOVA ME beam, no longer symmetric New instrument (TVPT) for monitoring beam vertical position New baffle (larger hole) Step 1: center beam into hadron monitor (without target in way) last vertical BPM appears 1.00 to 1.25 mm low; go with hadron monitor angle. 19 m

  3. Step 2: scan beam across horn “cross hairs” and horn 1 neck Fin for beam horz. alignment Nub for beam vert. align Beam loss mon. to detect beam scatter from fin

  4. See horn 1 fin in BLM 1Also see sculpting from horn 1 neck

  5. See horn 2 fin in BLM 2(along with spray from horn 1 fin)

  6. Scans done at low intensity to not destroy horns etcAt low intensity, get ¼ mm jitter in relative BPM readout(H scan 3 angled scan)

  7. See feature Consistent with H1 fin nub, but set horn 1 vertical from much more obvious horn 1 neck feature

  8. Horn 2 nub sets horn 2 vertical

  9. Target and baffle: Horz. adjusted to “perfect”

  10. Vertical target scan using hadron monitor“Fit” by eye with three cumulative gaussians, representing target fin and two baffle edges, (amplitude = no. of int. lengths, tuned to plot) Baffle at nominal Target tip 0.4 mm low Lack of target symmetry makes this hard to judge

  11. 1st attempt with TVPT to get target vertical, using very unstable beam.Will re-do with better data taken today.

  12. Summary of scan results

  13. From NuMI TDRtolerances

  14. To do • Beam spot size • design was 1.3 mm RMS • Beam spot startup until today was 1.6 to 1.7 mm RMS (not “physics quality” beam) • Re-tuned today to 1.0 mm (based on old NUMI) ; working on 1.3 mm tune • Target is 0.5 to 1 mm low • Analyze data taken today • Probably raise target tomorrow during shutdown

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