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LIU Beam Wire Scanners: Status and plans for new SPS and PSB BWS
J.L. Sirvent On Behalf of: R. Veness, F. Roncarolo, J.Emery, P. Andersson, W. Andreazza, D.Gudkov β¦ and many others BI/TB on uTCA, LIU wire-scanner results and AWAKE status 14/09/2017
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Outline 1. The Pre-Series Beam Wire Scanners
2. Scanner studies on calibration bench 3. Performance with beam on parallel MDs. 3.1 SPS Prototype 3.2 PSB Prorotype 4. Plans for SPS and PSB BWS
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BE-BI-PM Jose Luis Sirvent Blasco (jsirvent@cern.ch)
The Pre-Series Beam Wire Scanners BE-BI-PM Jose Luis Sirvent Blasco
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1. The Pre-Series Beam Wire Scanners 1.1 Two different designs
SPS Type: Glass disk on opposite side of the motor Fibre optic on vacuum PSB Type: Optimized design, compact structure on one side. BE-BI-PM Jose Luis Sirvent Blasco
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BE-BI-PM Jose Luis Sirvent Blasco (jsirvent@cern.ch)
Scanner studies on calibration bench BE-BI-PM Jose Luis Sirvent Blasco
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BE-BI-BL Jose Luis Sirvent Blasco (jsirvent@cern.ch)
2. BWS Calibration bench studies: 2.1 Scanner wire position accuracy and precision BE-BI-BL Jose Luis Sirvent Blasco
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2. BWS Calibration bench studies: 2
2. BWS Calibration bench studies: 2.1 Scanner wire position accuracy and precision Optical system to obtain practical angular-to-projected transformation. Angular calibration of position sensors Projection based on Scanner Mechanics: Three parameters fit based on equation: πΆ π , πΉ π , π Extracted residuals to determine: Precision & Accuracy Precision: Systematic deviations , Accuracy: Random variations π= πΆ π β πΉ π cos πβ πΌ ππππ ππ +π BE-BI-PM Jose Luis Sirvent Blasco
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BE-BI-PM Jose Luis Sirvent Blasco (jsirvent@cern.ch)
2. BWS Calibration bench studies: 2.1 Scanner wire position accuracy and precision Systematic oscillations at different speeds observed on fit residuals (very repetitive). Different spatial frequency but similar temporal frequency (1-2 kHz). Natural vibrations? Speed 8 m/s 20 m/s Residuals Spread 5.5 um 11.5 um Accuracy 10 um Precision 2.5 um 6 um * Operational fast BWS (PSB) show uncertainties ~100um How this translates into BbB beam profile uncertainty? Highly dependent on the beam measurement conditions (beam width & Speed) πππ
π₯ = π ππππ π π π ππ‘ππ‘ππ π‘ππ πππ
π₯ , πππ = 0.4 πππ
π₯ πππ *However other factors also contribute (amplitude statistics, SNRy) BE-BI-PM Jose Luis Sirvent Blasco
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BE-BI-PM Jose Luis Sirvent Blasco (jsirvent@cern.ch)
Performance with beam on parallel MDs SPS Prototype BE-BI-PM Jose Luis Sirvent Blasco
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BE-BI-PM Jose Luis Sirvent Blasco (jsirvent@cern.ch)
3. SPS Prototype Beam Tests: 3.1 Precision on beam width determination with a COAST Tests conditions: Single bunch (0.23e11 Protons) at 270GeV. Beam/Wire interceptions every 23us (SPS rev. period) Beam continuously circulating during various hours. Emittance (and beam sigma) growth with time. Prototype scanner BWS V scans at 20m/s. Reference scanner BWS V scans at 1m/s. Analysis and processing: Single bunch profiles parametrized as Gaussian. Beam width precision: Spread around linear growth. Beam centroid precision: Spread around mean value. Scanner BWS.51731 BWS.51740 PMT Diam. Speed 1 20 Points per Sigma 39 1.7 Sigma (um) (Ο %) 900 Β± 28 3.0 % 800 Β± 18 2.3 % 800 Β± 35 4.3% Emit. (um) 2.5 Β± 0.12 4.7% 2.5 Β± 0.07 3.0% 2.5 Β± 0.22 8.7% Centroid (Ο um) 94 um 48 um 66 um BE-BI-PM Jose Luis Sirvent Blasco
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BE-BI-PM Jose Luis Sirvent Blasco (jsirvent@cern.ch)
3. SPS Prototype Beam Tests: 3.1 Precision on beam width determination with a COAST BE-BI-PM Jose Luis Sirvent Blasco
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BE-BI-PM Jose Luis Sirvent Blasco (jsirvent@cern.ch)
Performance with beam on parallel MDs PSB Prototype BE-BI-PM Jose Luis Sirvent Blasco
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3. PSB Prototype Beam Tests: 3.1 Precision on beam width determination
Detectors detail ICECAL_V3 FE detail Beam Sigma spread comparison for prototype and operational (Ring 3 Horizontal) LHC25 and ISOLDE beams at different energies. Many points per sigma in both scanners : 200 β 500 Successful Prototype operation: Similar performance for LHC25ns (Dominated by amplitude statistics in both BWS?) Beam sigma errorsο Prototype Β± 0,7% , Operational Β±1,3% (ISOLDE). Prototype Operational Beam Type Operational Prototype LHC25 1.4GeV 2559 Β± 31, 1.2% 2569 Β± 37, 1.4% ISO 588 MeV/c 8021 Β± 125, 1.6% 8245 Β± 52, 0.6% ISO 886 MeV/c 6354 Β± 88, 1.4% 6571 Β± 46, 0.7% ISO 1.39 GeV/c 5302 Β± 44, 0.8% 5538 Β± 38, 0.7% ISO 1.92 GeV/c 4880 Β± 53, 1.1% 5025 Β± 34, 0.7% Beam sigma measurement (um) and spread during MD in um and %. BE-BI-PM Jose Luis Sirvent Blasco
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3. PSB Prototype Beam Tests: 3.1 HDR acquisition system evaluation
Detectors detail ICECAL_V3 FE detail Aim: Ease BWS operation and avoid tuneable parameters (HV+Filter selection). Prototype equipped with two secondary acquisition systems: A) Standard: Single channel acquired on surface. B) HDR Based on Q-PMT detector: 4 channels acquired on tunnel with ICECAL FE. Scint. photon yield varied by 1e3: STD ο Required filter changes HDR ο Static configuration ο PMT Saturation free BE-BI-PM Jose Luis Sirvent Blasco
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3. PSB Prototype Beam Tests: 3.1 Identified issues and actions
Detectors detail ICECAL_V3 FE detail Issue: Not operated since then ο Glass Disk was slippering into the BWS holder. Initial calibration table not valid anymore. Incorrect beam projections. Data shown was corrected by software (but potentially biased by this effect) Actions: New BWS with improved disk holder is prepared to be installed on next TS (19/09/2017) Scanner is under testing prior to installation ο Calibration and performance assessment on optical bench. Small Scintillators to be substituted by bigger ones ο Expected Improved amplitude statistics. BE-BI-PM Jose Luis Sirvent Blasco
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BE-BI-PM Jose Luis Sirvent Blasco (jsirvent@cern.ch)
Plans for SPS and PSB Prototypes BE-BI-PM Jose Luis Sirvent Blasco
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BE-BI-BL Jose Luis Sirvent Blasco (jsirvent@cern.ch)
To fill in now⦠PSB Prototype: New MDs to schedule once scanner is replaced before (if possible before EYETS) Improved secondaries readout system (bigger scintillator and modified electronics). SPS Prototype: Should we specify some tests here? Used as evaluation platform for HDR Bunch by Bunch acquisition system under design. BE-BI-BL Jose Luis Sirvent Blasco
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