1. Project Update Duncan Scott

2. Leaving Behind 2 Ongoing Projects Secondary Electron Yield Measurements – What happened during since startup Tomography – Current Status – ‘hints’ for users – Examples

3. SEY Stand installed in tunnel Testing during shutdown was difficult – Work going on in nearby area – High humidity Built N2 line with 3 bottle manifold (J Edwards, M.Backfish) N2 should last 3 or 4 months Ion pumps and RFA signal added to ACNET Installing first samples noticed problem – Right hand arm is bent, sample does not fit vacuum vessel wall – Arm is non-operational

4. RFA sees E-cloud signal Typical Signal on other detectors (MI52) magnet ramp kicking cloud out?

5. RFA sees E-cloud signal MI10, I:CLOUD5, cloud stays – Magnet bus is further away

6. SEY Results Performed 5 scans so far

7. SEY Results Performed 5 scans so far Spurious points due to DAQ getting better at stopping them

8. SEY Results DAQ issues – The computer is very old and slow – Loading labview and correctly connecting to PSU can take many tries (sometimes over 1 hour ) Always managed to get it to work – Similar size Scan sometimes takes 25 mins sometimes 2 hours (!) (add 2 hour++ warm-up time) Behavior started after shutdown, pushing rack around tunnel is not good for the system? – Yi Chen (PhD student at IIT) has a new computer and cards etc. and will build a new DAQ system If we get two arms could do 2 scans at once

9. SEY Numerous people can do scans – Bob Zwaska, Yi Chen, operations – Adam Watts has agreed to take over from John Implement an alarm when N2 pressure is low Continue scanning current sample – Implement new DAQ system Look at different samples, coating etc. Will be main topic of Yi Chen’s PhD (currently in 1 st year) – Expect he will lead work through Bob

10. Tomography Latest version of TARDIS on i122 – Compiled offline versions for mac and Windows, example main.cpp‘s in PA4219 folder – Introduction and User Manual in Beamdocs Latest version includes – Fewer crashes – Tomography during ramp – Data logging of (E,t) spread and offset – Load “Canned” setup from save file Startup is about as simple as it could be Plan to Run 24/7 in MCR

11. Canned Setup, from.txt file

12. Pre-Processing The most esoteric part of setting up TARDIS – See manual for more explanation – Add to source code if you like… Convert raw data into bunch profiles centered in bucket – Find signal, injections, batch positions – Estimate where bucket centres are – (can) Correct signal distortion due to coax resistance, noise filter – Generate profiles

13. Find signal etc.. Signal start and end frame Injections Batch positions

14. Bucket Centres Calculate these using raw data (not easy to “get” ?) Take selected data and sum it to average oscillations Methods: 2 types of 2 types Moments have offset due to artefacts, Peak methods can fail with multiple peaks (slipstacking) non - localkeep the spacing between middles constant Local Does not restrict the bunch spacing by the RF frequency moment Calculate the moment (balance points) of the distribution and use that to estimate the centre peakUse the position of the peak intensity of each bunch.

15. Artefacts These artefacts shift the moments to the right

16. Three “tails” Generated Effect of Artefacts on Tomography Three “tails” Generated Slight kink at start and end of reconstruction No bend Discrepancy may rise

17. Artefacts Peak Methods basically cut out most of the artefact

18. Three “tails” Generated Add offset during Tomography (-0.3ns) Three “tails” Gone Projection better follows data Discrepancy “ok”

19. Three “tails” Generated Or Pre-process “better”

20. Effect on Recon Projections MomentsTomo offsetPeaks ∆E offset (Mev)0.18-1.72-1.78 ∆E spread (Mev)7.436.706.66 ∆t offset (ns)-0.01-0.02-0.04 ∆t spread (ns)1.571.541.47 Mean D3.02E-31.77E-32.03E-3 D spread0.46E-30.16E-30.22E-3 Simple rule seems to be – Slipstack use moments – Normal beam use peak – fudge with offsets in tomography For studies, when you want really “good” reconstructions

21. Beam loading (?) Often see correlation with position in batch and centre Pre-processing also does “time domain ” analysis of (E,t) offset

22. Current Front Page Plots & layout are configurable

23. (E,t) logging Currently log Batch 1 at injection Should also be able to monitor high low energy beam during slip stacking Energy Offset Time Offset Time spread Energy spread

24. Logging Parameters I:TAREOFEnergy Offset I:TARESPEnergy Spread I:TARTOFTime Offset I:TARTSPTime Spread I:TARDISMean Discrepancy I:TARDSPDiscrepancy Spread I:TARAUXCurrent State of TARDIS I:TAREOHEnergy Offset Hi cut I:TAREOLEnergy Offset Lo cut …Etc. I:TARTSLTime Spread Lo Cut I:TARDISMean Discrepancy I:TARDSPDiscrepancy Spread I:TARAUXCurrent State of TARDIS Bunch Type slipstack Cut Recon along ∆E =0 Higher and Lower than Bunch Type “’Normal”

25. Other studies Nick Evans is basing his PhD on this program and has used for it – Emittance blow up during transmission crossing – Effect of dampers – All sorts of coupling, bunch oscillations etc. could be characterized …

26. Dampers on / off Start of Batch Middle of of Batch

27. Summary SEY Stand – Lots of help from operations (J. Edwards, M Backfish…) – (half) working – DAQ could break at any moment – First Sample being Succesfully Measured TARDIS – Startup is a simple as it can be – Data can be recorded – Setting up pre-processing will be hardest to learn – Skill in spotting / and correcting artefacts