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ILCDR/CesrTA meeting Low Emittance Tuning 報告 200807 K.Kubo.

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Presentation on theme: "ILCDR/CesrTA meeting Low Emittance Tuning 報告 200807 K.Kubo."— Presentation transcript:

1 ILCDR/CesrTA meeting Low Emittance Tuning 報告 200807 K.Kubo

2 ILCDR08 workshop + CesrTA meeting 2008. 7.8 ~ 11 at Cornell Two topics: –Electron Cloud (main issue)  末次報告 –Low emittance tuning  久保報告 参加者 ~40 (E-cloud : LET ~ 2:1) – 日本 (KEK) から7人

3 Mark Palmer & David Rubin



6 Low Emittance Tuning session Overview, A.Wolski Experimental Plan for low emittance in CesrTA, David Rubin Talks on Instrumentation and measurement techniques Reports of machine experiences and tuning methodes Modeling and plans for future machines Modeling and plans for CesrTA Discussions, plans for CesrTA, Collaborations

7 Overview by A.Wolski Design issues of ILC DR –Low emittance, <=2 pm –Difficulties depend on design (no clear conclusion) The three-pronged approach: –Modeling and simulations –Instrumentation and diagnostics –Experience of existing machine

8 Experimental Plan for low emittance in CesrTA, David Rubin CesrTA lattice Sensitivity of vertical emittance to optical and alignment errors Beam based alignment –Beam position monitor upgrade Survey Dispersion measurement and correction Coupling measurement and correction Beam size monitor Lifetime as a measure of beam size Schedule

9 Instrumentation and measurement techniques X-ray beam size monitor at ATF DR, H.Sakai (Tokyo U.) Fast X-ray beam size monitor for CesrTA, J.Alexander (Cornell U.) High performance BPM, M.Wendt (FNAL) AC dispersion measurement, D.Rubin (Cornell U.) Beam based survey and alignemnt of magnets, D.Rubin (Cornell U.)

10 Reports of machine experiences (tuning methods) Coupling correction at Australian Synchrotron, R.Dowd (ASP) PEP-II optics modeling and low emittance tuning, Y.Yan (SLAC) Orbit response matrix analysis at ATF, A.Wolski (Cockcroft/U.Liverpool) BBA at ATF, T.Okugi (KEK) Optics correction at KEKB, K.Oide (KEK)

11 Modeling and plans for future machines NSLS-II Lattice design strategies, W.Guo (BNL) Simulation of orbit and dispersion correction in ILC DR, K.Panagiotidis (Cockcroft)

12 Modeling and plans for CesrTA Optics modeling, D.Sagan (CLASSE) Optics correction, D.Sagan (CLASSE) Beam Based Alignment of BPM with Orbit Response Matrix and coupling measurement, J.Shanks (CLASSE) CLASSE: Cornell Laboratory for Accelerator Sciences and Education

13 R.Dowd (ASP) Our calibrated model indicates we can currently achieve a vertical emittance of ~ 2-3 pm.rad

14 Betatron Phase & Coupling Measurement Coupling and betatron phase and are measured by shaking the beam at a betatron resonance and looking at the response at the BPMs. David Sagan Cornell University y x y x y x y x General case: beam motion is elliptical No coupling case C 12  0, C 22 = 0 C 12 = 0, C 22  0

15 K.Oide BPM has 4 electrodes. x,y,intensity can be solved from data of 3 electrodes.  Can be used for gain calibration of the other electrode.  Drift of electronics can be corrected.

16 For ATF, instrumentation BPM performance is very important –20 BPMs were upgraded for test and the performance confirmed –Remaining 76 BPMs ??? Calibration should be regularly performed –Learn experience in KEKB (?) (man power) Fast and accurate beam size monitor is important –Real time monitor during tuning Possible “new” methods –AC measurement may be considered Modulation of RF to induce synchrotron oscillation Need turn by turn BPM –Resonance excitation (betatron oscillation) may be considered Need phase lock of exciter, turn by turn BPM

17 For ATF, tuning and correction Optics should be cared. –Beta-function beats are very large. Need to perform matching. –Learn experiences of other rings. Consider different COD, dispersion and Coupling correction methods (?)

18 For ATF, alignment etc. Magnet re-alignment will be done in this summer Beam Based Alignment Measurement is important –Qaud to BPM is straight forward –Sext to BPM ? –Consider other methods. Issues of skew quad –All sextpoles have skew quad trim coils. –Field quality has not been checked –Skew quad center is sext center ? (affect BBA)

19 For ATF Low emittance, Summary Learn from other machines Continuous maintenance/ tuning/calibrations are important BPM performance is essentially important

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