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A Path Toward Standardized Low-Energy Emittance Measurements

A Path Toward Standardized Low-Energy Emittance Measurements. Doug Moehs. January 17, 2007. Outline. LARP Mission and Interests Motivation Emittance Problem Possible Solution Allison scanner SCUBEX Conceptual Outline Conclusions. LARP Mission and Interests.

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A Path Toward Standardized Low-Energy Emittance Measurements

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  1. A Path Toward Standardized Low-Energy Emittance Measurements Doug Moehs January 17, 2007

  2. Outline • LARP Mission and Interests • Motivation • Emittance Problem • Possible Solution • Allison scanner • SCUBEX • Conceptual Outline • Conclusions Doug Moehs

  3. LARP Mission and Interests • Involve US laboratories in LHC upgrades • LHC upgrade plan: Utilize H- beams!!! • (http://paf.web.cern.ch/paf/Presentations/PAF_report_ABMB_22May2006.pdf) • Priority 1: H- source development • Priority 2: Linac4 and SPL construction • Develop Accelerator Instrumentation • Work at the technological frontier • Involve young scientists and students Doug Moehs

  4. Motivation • All of the CERN upgrade plans include a new H- Linac! • A 3 MeV test stand is now under construction at CERN • This is paralleled by Fermilab's HINS efforts Doug Moehs R. Scrivens, CERN

  5. Motivation HINS LEBT-RFQ beam matching • Need Quality low-energy transverse emittance data • CERN has no available emittance probes (Thomas Meinschad, CERN Post. Doc. working on the CERN 3 MeV H- front end) • Fermilab probes are old and unreliable • HINS is relying on old data from a different LEBT energy to match to the RFQ B. Mustapha and P. Ostroumov, ANL HINS R&D Meeting, December 14, 2006 Doug Moehs

  6. Basic Definitions Martin Stockli Doug Moehs

  7. Emittance Problem • Tough to compare Low-energy emittance values • Sensitivity to: • How they are measured • Probe type • Double slit • Slit harp • Pepper pot • Where they are measured • After source • After LEBT or MEBT • Analysis method used • Thresholding • Bias subtraction • Eyeballing! D. Moehs et al., IEEE Trans, Plas. Sci., 33, 1786, 2005 Doug Moehs

  8. Emittance Problem Historical Magnetron Emittances • Impedes: • ion source selection • LEBT • simulation • Design • Beam Matching D. Moehs, PNNIB, Sante Fe, Sept. 2006 Doug Moehs

  9. Possible Solution • Create a Standard Candle • Establish a “standard” probe type • Establish a “standard” analysis procedure • A good place to start • Follow SNS work (contact: Martin Stockli) • Utilize a highly developed Alision scanner • Analysis software called SCUBEX • Further testing of this software is needed! Doug Moehs

  10. Allison Scanner • Double slit • Single charge collector • X • stepping motor • X’ • Electrostatic beam deflection • Moderate data collection speed • Slower than slit-harp • Faster than double slit Some form of this scanner is in use at SNS, LBNL, ORNL(SNS) Picture provided by Martin Stockli Doug Moehs

  11. SCUBEEX Self Consistent, Unbiased Exclusion Ellipse EXclusion analysis • Excel macro software developed at SNS to compute normalized, RMS emittance • Free but not widely used • Needs additional debugging and testing Doug Moehs

  12. Conceptual Outline • Construct 3 sets of emittance probes including electronics • Follow SNS design • Primary users: CERN, Fermilab and SNS • Test probes in one location • Write up operating and analysis techniques • Disseminate probes and information • End result comparable emittance data from primary users • Cost to LARP • 2 sets of emittance probes and electronics • Testing and dissemination • Possible Travel: • Learn about emittance system operation and data analysis program • Installation and data collection at CERN Doug Moehs

  13. Collaborations • The DESY RF source has been adopted at CERN • The same source is of interest for use on a Proton Driver • See (Fermilab AAC 2006 summary talk by Hans Weise) • Informal collaboration partners: Fermilab, CERN, DESY, SNS • Other labs expressing interest in good emittance data: LANL, ISIS Proposed New or Improved Machines Doug Moehs

  14. Conclusions • The goals of this project are consistent with the mission and interests of the LARP collaboration. • This project provides timely data for CERN and several US laboratories including Fermilab. Doug Moehs

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