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Data Taking and Samples

This report highlights significant progress in data collection from low to medium energy proton runs, with increased frequency towards the end of 2006. Despite some data loss due to hardware issues, comprehensive measurements of energy spectra such as synchrotron radiation and Compton peaks were evaluated. Preliminary findings indicate a 1.2% estimated error in cavity result comparisons, with ongoing systematic studies. Additionally, improved fitting programs and Monte Carlo simulations are set to enhance data analysis, aiming for precision results by summer 2008.

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Data Taking and Samples

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  1. Data Taking and Samples 2006 • Increasing data taking frequency towards the end • Quasi full-time operation in the low-medium proton energy runs • Some data loss due to various hardware problems

  2. Measured Energy Spectrum & Fits Syn. rad. peak Measured E spectrum: - Synchrotron radiation peak - Black body - Compton peak - Bremstrahlung edge * Each spectrum/bunch/~10s * Matches with left/right circular polarized laser beam Fits: - Detector resolution + non- linearity parameters - Synchrotron radiation - Black body - Bremstrahlung rate & flux - Compton rate & flux - e-beam polarization Black body Brem. edge Compton peak

  3. One Example Comparison Cavity-TPOL Every measurement corresponds to 1 mn 0.9975±0.0020

  4. LPOL-TPOL-Cavity Comparison 2007 !!! All cavity results are still preliminary !!! - Special rise-time data are not included - Very short periods (<<1 h) are not shown

  5. Preliminary Systematic Studies Most of the errors are conservatively estimated. Some of the error sources are redundant (e.g. calo position scan with beam position scan). Error reduction is expected in the future with improved fitting program.

  6. Summary, Other Development and Plan • Majority of the cavity data analyzed • Preliminary (conservative) systematic studies performed (~1.2%) • Detailed MC simulation of the calorimeter response carried out • New description of the synchrotron radiation peak using MC input & other improvements in the fitting program being tried • Final data analysis and precision expected before summer 2008

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