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Beam Tests Analysis and Centering Results for Proton and Pb82+ Beams

This report summarizes the results from the TI2/TI8 tests conducted on October 9, 2009, involving proton (p+) beams at intensities of 5e9 and 1.2e11, as well as lead ion (Pb82+) beams with 9e7 ions. Detailed measurements were taken on beam centering and size, including jaw position scans, and loss measurements were performed but not normalized to intensity. Significant findings include expected versus measured beam sigmas, normalization challenges, and insights from trajectory scans. Overall, this document provides crucial insights into beam performance and loss characteristics under varying conditions.

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Beam Tests Analysis and Centering Results for Proton and Pb82+ Beams

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  1. TCDI setting-up beam tests W.Bartmann R.Assmann, C.Bracca, B.Goddard, V.Kain, S.Redaelli, A.Rossi, D.Wollmann, … TI2/TI8 Tests Result Meeting, 9-Oct. 09 ~6 hours with p+ (5e9 and 1.2e11) ~4 hours with Pb 82+ (9e7 ions)

  2. Beam centering/size with 5e9 p+ • TCDIH.29050 • Scan of jaw position and fits to find centre and sigmas • Done ‘online’ in CCC with Chiara’s script • Loss measurements not normalised to intensity • BLM.29053: sigma 0.71 mm, centre 0.00 mm • BLM.29104: sigma 0.72 mm, centre 0.07 mm • Beam sigma expected from 6.3 nm emittance: 0.76 mm BLM.29104 BLM.29053

  3. Beam centering/size with 5e9 p+ • TCDIV.29012 • Scan of jaw position and fit to find centre and sigmas • Done ‘online’ in CCC with Chiara’s script • Loss measurements not normalised to intensity • BLM.29012: sigma 0.32 mm, centre 0.35 mm • BLM.29053: sigma 0.23 mm, centre 0.31 mm • Beam sigma expected from 3.4 nm emittance: 0.32 mm BLM.29053 BLM.29015

  4. Beam centering/size with 1.2e11 p+ • TCDIV.29012, BLM.29015 • Scan of jaw position and fit to find centre and sigmas • Sigma 0.22 mm, centre 0.40 mm

  5. Beam centering/size with 1.2e11 p+ • TCDIV.29012, BLM.29053 • Scan of jaw position and fit to find centre and sigmas • Sigma 0.18 mm, centre 0.34 mm

  6. Beam centering/size with 9e7 Pb82+ • TCDIV.29012, BLM.29015, blue: with intensity normalisation • Scan of jaw position and fit to find centre and sigmas • Beam size 0.21 (0.19) mm, centre 0.07 (0.04) mm

  7. Beam centering/size with 9e7 Pb82+ • TCDIV.29012, BLM.29053, blue: with intensity normalisation • Scan of jaw position and fit to find centre and sigmas • Beam size 0.17 (0.17) mm, centre -0.02 (-0.04) mm

  8. Tail scan with ~1.2e11 p+ • Jaws set around derived beam centre • Jaw opening increased in steps • Very significant exponential beam tails…

  9. Angular scan scan with ~9e7 Pb82+ • Jaw angle varied with Pb82+ beam impacting • Minima found at 0.153, 0.109, 0.087 mrad • Average of 0.1160.034 mrad • Does not look very accurate (broad minima)

  10. Losses normalised to measured intensity? • Sounds like a good idea…. • Problem is poor resolution of TT40/60 BCTs with low intensity – for 5e9 p+ the noise on the intensity measurement is generally larger than the intensity fluctuations of the beam. • Should be much more accurate for 1.2e11 p+ (noise ~1%) • But saturation of BLMs seems to occur for 100 mGray TCDIV, 5e9, normalised to BCT signal TCDIV, 5e9, not normalised to BCT signal

  11. Trajectory Scan Trajectory scanned about TCDIH.29050 (-5 to +5 mm) and TCDIV.29012 (-2 to +2 mm) Centering looks reasonable

  12. Comparison: p+ –Pb82+ at 5e9 charges Ions BLM.29015 p+ BLM.29015 Ions, norm. BLM.29015 Ions, normalised to intensity and number of nucleons (2e10)

  13. Comparison collimator settings for different proton intensities BLM.29015 – 1.2e11 BLM.29015 - 5e9 • Saturation of BLMs • Max loss only factor 5 higher (intensity x20) • Moves crossing point upwards • Centering should not really be affected • Would tend to artificially make measured sigma smaller

  14. Summary table

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