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Comprehensive Testing and Quality Control of PMTs at University of Iowa: Results and Future Plans

This report presents the measurement results of photomultiplier tubes (PMTs) from leading manufacturers—Hamamatsu, EMI, and Photonis—under the specifications outlined by the CMS-HCAL committee. It details the test and quality control system designed at the University of Iowa, including tasks for evaluating each tube's performance such as double-pulse linearity and gain characteristics. Additionally, it discusses the implications of these measurements for ongoing experiments and outlines the development of a PMT database for enhanced data management and accessibility.

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Comprehensive Testing and Quality Control of PMTs at University of Iowa: Results and Future Plans

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  1. CMS HF PMT SYSTEM By Y. ONEL U. of Iowa, Iowa City, IA HF-RBX PRR CERN Apr 3-4, 2003

  2. CMS-HF PMT Test and Quality Control System U. Akgun1, A.S. Ayan1, F. Duru1, E. Gulmez2, M. Miller1, J. Olson1 Y. Onel1, I. Schmidt1 with Quarknet Group – P. Bruecken, C. Like, R. Newland 1 University of Iowa, Iowa City, USA 2 Bogazici University, Istanbul, Turkey Abstract We have measured the specifications proposed by the CMS-HCAL committee on the candidate phototubes from the three major manufacturers; Hamamatsu, EMI and Photonis. In this report, we present the results from those measurements and we outline the future measurements for the test and the quality control as well as the design of the new University of Iowa PMT test station facility.

  3. Tasks of the Test System For one tube in every batch: Double-pulse linearity, Gain vs HV for each batch Single photoelectron spectrum X-Y scan (spatial uniformity) Lifetime For each tube: Pulse width Pulse rise time Transit time Transit time spread Anode dark current Relative gain coupled with cathode sensitivity, Pulse linearity Quality control decision on each tube.

  4. UNIVERSITY of IOWA PMT TEST STATION

  5. LabVIEW software

  6. PMT Timing Data (1900 PMT’s)

  7. PMT Timing Data (1900 PMT’s)

  8. PMT Data (1900 PMT’s)

  9. CA0058 Double Pulse Linearity

  10. Double Pulse Linearity Results on 10 PMTs Note: Statistical error is %0.9

  11. Single Photoelectron Spectrum at 1100V

  12. Single Photoelectron Spectrum at 1500V

  13. XY Uniformity

  14. Definition of Relative Gain and Gain Relative Gain (Normalized Output): Anode output of a PMT when exposed to the same light intensity (±2%) as the Reference PMT and normalized with respect to the output of the Reference PMT For each PMT, Reference PMT is also tested. Gain: Anode output current / Cathode output current

  15. Relative Gain vs Gain CONCLUSION: We can sort pmts w.r.t. their Relative Gain values

  16. Gain vs HV for Relative Gain %50-%70

  17. Lifetime Measurement Setup

  18. Timing characteristics after 1100 C • After more than 1100 C of charge accumulation: • - No change in timing properties. • Gain dropped to %70 of initial value. • Experiment is still on.

  19. PMT Web Database Sort by column (Ascending or Descending) Alternating colors to aid readability Pagination reference for large data sets More extensive search/sort options are being developed

  20. PMT Web Database

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