1 / 16

EMR Construction Status

EMR Construction Status. Jean-Sebastien Graulich, Geneva. General Design Electronics Cosmics test. EMR General Design. EMR: Electron Muon Ranger EMR is needed to supplement KL for Downstream PID ( m /e separation) EMR is a ~1 tone Fully Active Scintillator Detector: 0.8x1x1 m 3

wyatt-berry
Download Presentation

EMR Construction Status

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. EMR Construction Status Jean-Sebastien Graulich, Geneva • General Design • Electronics • Cosmics test

  2. EMR General Design • EMR: Electron Muon Ranger • EMR is needed to supplement KL for Downstream PID (m/e separation) • EMR is a ~1 tone Fully Active Scintillator Detector: • 0.8x1x1 m3 • highly segmented in x, y and z • In addition to PID, it’s able to measure the muon momentum with a resolution of 2.5 MeV/c • much better than the spectrometer at low pT • For detailed description, refer to Frank’s talk at last VC

  3. http://indico.cern.ch/getFile.py/access?contribId=28&sessionId=3&resId=0&materialId=slides&confId=69027http://indico.cern.ch/getFile.py/access?contribId=28&sessionId=3&resId=0&materialId=slides&confId=69027 Daniela Lietti CM25

  4. Electronics • Each bar is read out on both side but with independent chains • Digital readout • Each bar is connected to one pixel of a 64 channels MultiAnode PMT • The PMT is connected to a Front End Board (FEB) where the signal is amplified and then discriminated • The logic signal from the FEB is sampled by a Digitizer and Buffer Card (DBC) • The DBC stores the data for the entire duration of the spill • The DBC is read out through a VME Controller card at the end of the spill • Analog readout • On the other side • All the fibers from each are bunched together and coupled to a single 1” PMT • The output of the PMT is connected to one channel of a 500 MHz sampling ADC (CAEN V1731) • The data is buffered in the ADC and readout at the end of the spill

  5. Electronics Status • FEB • Designed and produced by Trieste/Como • Based on existing FEB for another experiment (ASACUSA@CERN AD) • Recently modified and tested to use the MAROC amplifier/discriminator chip (instead of Gamma Medica/Ideas VA64TAP) • Digitizer and Buffer Card • Design in progress in Geneva • VME Controller • Based on general purpose VME board provided by Trieste/Como • Clock and Trigger distribution • Under discussion • Sampling ADCs • In hand in Geneva

  6. Cosmics Test • One full module (2 layers) operational in Geneva • DAQ provided by Como/Trieste • Many Thanks to Daniela Lietti and Davide Bolognini 2 EMR Layers Trigger Scintillator 10x10 cm2 2 X-Y Silicon stripdetectors 10x10 cm2

  7. The first EMR Module FEB (old design) FEB X Single anode PMT All fibers bunched Y

  8. Analysis – Prerequisite • Using the prototype Front-End Board based on the VA64TAP chip • Need to scan the sampling time to determine our working point

  9. Tracking • Selecting single events in the Si-Array, the track are extrapolated to the EMR position • -> Residuals look OK • Strong evidence for cross talk (for this prototype we use of 2 x 0.8 mm fibers instead of a single 1.2 mm fiber) Neighbor channels on the fiber mask

  10. Spatial Correlation PM1 Low value → bad coupling or problem with the ASIC channel? PM0 Inversion of one of the two fibers of each channel

  11. Efficiency Calculation • Extrapolate the tracks to the EMR planes • Identify the fiducial surface used for the computation of efficiency ( Limited by statistics) • Efficiency calculated with both single -and multi - cluster events • To define the cluster: cut on the PH • Two clusters are considered as separated if the two maxima are separated of at least 2 bars

  12. Measured Efficiency PM0 PM1 ACROSS THE BARS AVERAGE ALONG THE BAR

  13. Overall Homogeneity Analysis performed by Michela Prest in Como • There is a 2% difference in efficiency between the two planes. Under investigation. Probably due to crosstalk contribution (TBC) • These values do not change with hold time → intrinsic efficiency? • An independent analysis is being performed by Havard Wisting at Univ. of Geneva

  14. Cosmics test Summary • Currently taking data at about 3 Hz • Preliminary average efficiency is 93.5 % • Next Steps • Integrate the single PMT readout in the DAQ • Need to migrate from SBS Bit3 to CAEN VME-PCi interface first • Refine Efficiency Measurement • Optical grease for better optical connection • Green Enhanced MA-PMTs • Test flex connectors needed for final assembly • Define test procedure for QA during production

  15. Project Plan • Running full speed, we need 6 working days to produce 1 module (2 layers) => Production time: 7 months • EMR production should end in September 2010 • Digitalization and Buffer card design test and production • Estimated to 6 months • Current design doesn’t allow mounting electronics after assembly -> New design under study • We are considering a partial delivery to RAL this summer in order to have an early test of integration in the DAQ

More Related