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Plans (& ideas) for beamline commissioning

Plans (& ideas) for beamline commissioning. The beamline Magnet field tests Source characterisation Optics (& model) commissioning. K. Tilley CM18, 14/06/07. The beamline until Jan? (this presentation). ‘please sir’. Magnet field tests – Upstream: Q1-3 & B1.

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Plans (& ideas) for beamline commissioning

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  1. Plans (& ideas) for beamline commissioning • The beamline • Magnet field tests • Source characterisation • Optics (& model) commissioning K. Tilley CM18, 14/06/07

  2. The beamline until Jan? (this presentation) ‘please sir’

  3. Magnet field tests – Upstream: Q1-3 & B1 Upstream Possible – In test area: QIV(s), (B1 – less likely) Sometime 18/06 – 01/07 – currently being discussedUpstream Fallback – In situ: QIVs, B1 By negtd access August?

  4. Magnet field tests – Upstream Possible In test area: QIV x1+, (B1 – less likely). being discussed for 18/06 – 01/07eg: QIV before installation. - Pole tip fields v Current to 200A (cf. old g.v.I data) (compare to old data curve) - deGauss procedure (to 200A) - Gross magnetic centre (with Mr Heath Robinson) Currently searching for XY translation stage/support- - for improved versions of all above - L_eff & field quality – unlikely.

  5. Magnet field tests – Upstream Fallback In situ: QIVs, B1. By negotiated access August?- for QIVs:- - polarity (Hall probe between poles) - deGauss procedure? (ditto: desire minml jig?) - others are more difficult (but may try). (note do have old g.v.I data)- for B1:- - polarity - B.v.I – some access (desire miniml jig?) (note do have old B.v.I data) - deGauss procedure

  6. Magnet field tests - Downstream Same plan as CM17 – B2, Q35s Unchanged procedure & measurements: - we have no B.v.I tables for Q35s - use XY stage/jig (for Q35s)... - still need someone to make jig.Timeframe – If B2 to be used Aug onwards – measure August?! Q35s sometime Sept – Dec?Location – undefined. Test area if pre Dec? MICE Hall once installed?

  7. Magnet field tests – Decay Solenoid Discovered I don’t have any B.v.I tabulation ! Does PSI have these? (could we measure these? eg. fringe field & model?)

  8. Source characterisation – naïve ideas

  9. Source characterisation – naïve ideas Once beam, could consider using available detectors to tell us something about particle source, ie:- - Determine intensity (au) of whole flux versus momentum - Range out protons & determine intensity (au) of (∏ +µ+e) versus momentum - Range out protons & use Ckov1, later TOFs to: determine intensity (au) of ∏ versus momentum - Knowing ~ intensity (au) may help beamline setup for maximum flux etc.

  10. Source characterisation – naïve ideas Once beam, might consider using available detectors to tell us something about particle source, ie:- - Determine intensity (au) of whole flux versus momentum eg. (preceeding optics setup):- - use upstream fibre monitor for intensity (au) - use momentum scan of B1 (Quads off)

  11. Source characterisation – naïve ideas If synch vault was still accessible could also:- - Determine intensity (au) of (pi+mu+e) versus momentum:- eg. (preceeding optics setup) - insert protons absorber before u/str monitor - use momentum scan of B1 (Quads off) If synch vault or DSA not accessible, but B2 available, could perform same experiments with d/stream monitor, scanning both dipoles (B1=B2)

  12. Source characterisation – naïve ideas For even more fun, bring in Ckov1 / (later TOFs?) into play ?:- - Determine intensity (au) of (pi) versus momentum ?:- eg. (again preceeding optics setup) - insert proton absorber before d/str monitor - use Ckov1 count how many hits not pi’s. diff = pi’s - much easier if TOF available! - use momentum scan of B1 (Quads off) (Does this work? I told you I was naïve !)

  13. Optics (& model) commissioning Aim maybe to get the real optics into the design configuration. This might be: .or something slightly different nowadays.Aim to get this section understood & right

  14. Optics (& model) commissioning Start with best avail model (TTL/g4bl) – best developed & cross checked.Make simple expts and compare measurables to model – to establish we understand basic beam/model behaviour.Potential measureables:- upstream monitor: vertical beamsize (vertical position) flux if DSA available, use d/str mtr there: vertical beamsize (vertical position) flux. could use both monitors:-> vert opt fns & εv? I don’t know how to measure horizontal beamsize/posn directly (only via flux)

  15. Optics (& model) commissioning Example: Q1 on, Q2/Q3 off. B1 on. Vary Q1. Observe change in vertical beamsize/optic fns/ εv Compare with model expected behaviour. Could fit model to machine. (L_eff etc) Vary target depth. Repeat above. Observe if any change in vertical position (source position) Finally bring up Q1-Q3 as single lens. Modify Q1-Q3 using model until believe obtain design optic.

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