Status of tools and available beam instrumentation in

Status of tools and available beam instrumentation in the PS for MTE Marcel Coly, Alexander Huschauer, Davide Gamba, Frank Tecker Many thanks to the Operations team!

MTE status and prospects • Beam gets routinely send to the SPS • Gradual intensity increase from 1400 e 10 -> 2000 e 10 p presently • Increase up to 2500 e 10 foreseen (see Alex’ talk) • Critical points • Losses => Island / Core trajectories => Shadowing of extraction septum 16 • Transverse emittance

MTE Vistar

Orbit for island extraction - Shadowing Dummy septum 15 is to protect SMH 16 from excessive losses

Diamond BLMs around extraction • The shadowing was well setup in 2015/16 by using fast BLMs to shift losses from SHM 16 to the dummy septum in SS 15. • Reflected in radiation surveys that show dose in SS 16 less than ½ of SS 15 • In 2017, BLMs were not available until July BLM 15 • Orbit changed after realignment 2015 (at 10 Ge. V => better at 14 Ge. V? ) • Optimizing the shadowing impossible BLM 16 • 2017 ITS radiation surveys show equal dose rate in SS 15 and 16

Shadowing optimization • Losses in SS 16 almost as high as in SS 15 • Dummy septum / septum movement affects other beams • Position of the dummy septum is at interior limit • Possible to improve shadowing by orbit changes • Optimization difficult Operational MTE BLM 15 BLM 16 MTE clone BLM 15 BLM 16

Orbit correction • Only 3 high energy correctors (sections 5, 18, 60) • Linear feedback tool from Davide Gamba • First used to move orbit at BPM 15 by +3 mm • Tried to approach 2016 orbit

Tools for optimization: MATLAB scripts / Python • MATLAB interfaced with CO libraries to access equipment settings and acquisitions • Or Python scripts to do the same • => automated measurements with high statistics • Analysis by Python scripts (on SWAN) using libraries for MATLAB and TIMBER access (Guido’s my. Toolbox) • Very convenient to combine acquired and logged data • • my. Toolbox. from. Matlab. To. Data. Frame my. Toolbox. from. Timber. To. Data. Frame([parameters], t 1, t 2) my. Toolbox. add. To. Data. Frame. From. CALS(data, [parameters]) …

Bump optimization • Four fast bumpers in SS 12, 14, 20, and 22 • Done by Marcel with Python scripts • Can improve the shadowing • Better shadowing increased total losses and other BLMs Marcel Coly

Bump optimization – Loss distribution • What is our figure of merit? • Need to define trade off of losses at SMH 16 and elsewhere Operational MTE clone

Vertical emittance and intensity evolution WS 64 V WS 85 V Alexander Huschauer

Vertical emittance • 64 V broken wire since mid-August => 85 V had to be used • 85 V gives larger emittance measurement => only relative measurements • SEMGrids in PS measure higher value than is SPS @ 190 ms Alexander Huschauer @ 700 ms

Vertical emittance • For higher intensity • Higher injected emittance • Stronger blowup during cycle Alexander Huschauer

Scan of vertical emittance (12/09/2017) - WS 85 V • Intensity ~1800 e 10 • TFB excitation OFF • Main growth in first ramp and beginning of flat top • Constant bucket area could help for first ramp • Working point optimization could help for flat top Alexander Huschauer

BTV 15 screen • Used to steer the extraction • In mid-July it did not go to out position and can’t be used since • Will be hopefully examined during technical stop next week

TT 2 extraction line • Fast correctors (DFAs) allow to correct the 5 extracted turns • Setting on one cycle can affect another cycle => needs identical values on different cycles • BPM 274 in F 16 is now available in sampler to see spill trajectory • Regulation usually done by the SPS (Stephane) • SEMFil F 16. BSF 277 defective and taken out • SEMGrids have to be used

Conclusion • Fast BLMs essential for shadowing setup • Certainly need instrumentation from beginning of setup • Later changes during operation very tedious • Need to fix BTV 15 and WS 64 -V (foreseen for next week’s ITS) • Wire scanner measurements for relative emittance evolution • 3 HE correctors not sufficient => study for additional ones • Main magnet alignment could be done at 14 Ge. V • Need decision about trade off for losses / shadowing • We will continue on the emittance optimization

THANK YOU VERY MUCH!