1 / 11

Test measurements of the prototype Aerogel Threshold Detector

Test measurements of the prototype Aerogel Threshold Detector. Luka Debenjak 27 Students' Workshop on Electromagnetic Interactions Bosen, 30 . 8 .20 10. th. Introduction.

vidal
Download Presentation

Test measurements of the prototype Aerogel Threshold Detector

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. Test measurements of the prototype Aerogel Threshold Detector Luka Debenjak 27 Students' Workshop on Electromagnetic Interactions Bosen, 30.8.2010 th

  2. Introduction • Čerenkov radiation arises when a charged particle in a material medium moves faster than the speed of light in that same medium: Vparticle > c/n

  3. Introduction The separation of pions from kaons requires theuse of a Čerenkov detector. It will be placed between scintillator walls and shielding walls.

  4. Prototype 1 • Geometry:d = 2(4) cm, W x H x L = 10 cm x 20 cm x 9(7) cm • Box with no mirrors: Box with two flat mirrors : • PMT:Hamamatsu R1828-01, • Φ = 2” • HV: -2.4kV • n: 1.07, 1.05, 1.12 • Reflective coating: millipore paper • CFD: 10.9 mV

  5. Analyses with the electrons Kaos central momentum: 380MeV-530MeV, aerogel thickness d = 4 cm XY with ADC>450 ADC SUM ADC SUM with ADC SUM with TDC cut pedestal cut ADC with TDC cut counts ADC counts ADC with pedestal cut counts ADC counts eff1 = ≈ 95% eff2 = ≈ 95%

  6. Efficiency and Npe

  7. Analyses with the pions protons pions With additional cluster cuts: Npe = 3.4 p = 620 MeV/c, n = 1.07, without mirrors: eff1 ≈ 91% eff2 ≈ 94% eff1 ≈ 65% eff2 ≈ 86% p = 480 MeV/c, n = 1.07, with mirrors: N Nmax p = 1GeV/c 0.87 p = 620MeV/c 0.65 p = 480MeV/c 0.42 bgbtgt

  8. Prototype 2 – single cell of the final detector Geometry:d = 2(4) cm, W x H x L = 15 cm x 35 cm x 10 cm φ= 55˚ W d φ L H PMT: Hamamatsu R877-100, Φ = 5” Nominal HV: -1.25kV n: 1.05 Reflective coating: Spectraflect diffusive white reflective coating DIS: -30 mV Amplifiers: ~x20

  9. Prototype 2 d = 2 cm HV = 1250 V Thr = 30 mV eff = 90% d = 4 cm HV = 1300 V Thr = 30 mV eff = 82%

  10. Simulations • All the simulations are done in Litrani and SLitrani, a ROOT based program to simulate the propagation of photons through optical materials. Photon paths and absorption points are visible.

  11. Approximate final design • 9 cells • 18 Hamamatsu 5” SBA R877-100 PMTs • Labsphere Spectraflect reflectance coating • Aerogel thickness: 2 or 4 cm • L = 10 cm • H x W = 36 cm x 236 cm • φ = 55 ˚

More Related