1 / 8

Beam Measurements at the Meson Test Beam Facility

Beam Measurements at the Meson Test Beam Facility. Erik Ramberg AEM 19 May, 2008. G4Beamline simulation - New Differential Cerenkov counter First indications from CALICE measurements. Beam Rates and Content. Rates* without lead scatterer. Rates* with 1/4” lead scatterer.

jamil
Download Presentation

Beam Measurements at the Meson Test Beam Facility

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. Beam Measurements at the Meson Test Beam Facility Erik Ramberg AEM 19 May, 2008 • G4Beamline simulation • - New Differential Cerenkov counter • First indications from CALICE measurements

  2. Beam Rates and Content Rates* without lead scatterer Rates* with 1/4” lead scatterer *Rates here are normalized to 1E11 at MW1SEM **Measured at exit of facility with PbG calorimeter

  3. G4Beamline simulation created by Tim Rinn, St. Charles East H.S.

  4. Results from G4Beamline Simulation of MTest Energy Lead (mm) #pions #electrons Ratio 1 GeV 0 710 9990 0.07 0.5 15 129 0.12 1 8 43 0.19 2 5 6 0.83 5 2 5 0.4 2 GeV 0 2440 9990 0.24 0.5 200 486 0.41 1 88 158 0.56 2 46 27 1.71 5 10 1 10 4 GeV 0 5030 9990 0.5 0.5 1198 1585 0.75 1 671 548 1.2 2 308 110 2.8 5 109 2 55

  5. New Differential Cerenkov counter • Win Baker* copied design used successfully in MIPP • Jim Kilmer in charge of construction • Counter commissioned just before CALICE arrival • Timing of signals is just fast enough to be included in CALICE trigger • “Inner PMT” - accepts light near threshold • “Outer PMT” - accepts light from plateau region • “Inner x OutBar” - highly specific as to particle species • * Best Wishes! Outer PMT Inner PMT

  6. Results from Differential Counter Inner only Outer only -10 GeV -12 GeV +20 GeV

  7. Beam delivery for CALICE • CALICE experiment has challenged the capabilities of MTest,as well as provided the most sophisticated detector system to be installed there for beam measurements. • The AD has created beam tunes for: - Negative 1,2,3,4,6,8,10,12,15,20,30 GeV, as well as - Positive 32 GeV (high rate muon mode), 120 GeV - 1 second spill and 4 second spill MANY thanks go to Rick Coleman, Wally Kissel, External Beams Group and Operations CALICE Online plots 32 GeV muon mode 6 GeV

  8. Some Concerns • As expected, the CALICE data taking rate at Fermilab is an order of magnitude slower than at CERN. • This discrepancy is dominated by the low duty cycle. It is important to keep the supercycle as close as possible to 60 seconds for a 5% allocation of beam. • Some of the effect is due to bunching of beam, as indicated by their data taking rate plot: • There is evidence for pion content at 2 GeV, as shown by the CALICE online plots, but so far there is no clear signal at 1 GeV. 2 GeV pions

More Related