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Beam Secondary Shower Acquisition System: Beam-Wire Interaction and charge generation in pCVD

Beam Secondary Shower Acquisition System: Beam-Wire Interaction and charge generation in pCVD. Student Meeting Jose Luis Sirvent PhD. Student 22/04/2013. 1. Estimated signal by pCVD. Why we need to estimate the pCVD signal? 1. We are at LS1, accelerators stopped

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Beam Secondary Shower Acquisition System: Beam-Wire Interaction and charge generation in pCVD

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  1. Beam Secondary Shower Acquisition System: Beam-Wire Interaction and charge generation in pCVD Student Meeting Jose Luis Sirvent PhD. Student 22/04/2013

  2. 1. Estimated signal by pCVD • Why we need to estimate the pCVD signal? 1. We are at LS1, accelerators stopped 2. Need to know the maximal/minimal values to scale subsequent electronics. 3. Important in the SNR though long cables (250m) and cable selection 4. Electronic model to be developed (pSpice, RF system…) 5. Essential for dynamic range estimation and ADC Scheme selection

  3. 1. Estimated signal by pCVD • Why we need to estimate the pCVD signal? 1. We are at LS1, accelerators stopped 2. Need to know the maximal/minimal values to scale subsequent electronics. 3. Important in the SNR though long cables (250m) and cable selection 4. Electronic model to be developed (pSpice, RF system…) 5. Essential for dynamic range estimation and ADC Scheme selection • Dependencies (… a lot) : 1.Beam characteristics (Nbunch, Beam Sigma, Energy…) 2.Material characteristics (Eion, Density, Size, Drift speed…) 3.Electronics used (pCVD Bias Volt, Filters, layout…) 4.BWS Characteristics (Wire diameter, scan speed…) 5.Sensor Location (Distance, inclination…)

  4. … so better to go Step-by-Step

  5. 1.Estimated Signal by pCVD • Steps to calculate signal: A) How many protons per bunch hit the wire? B) Dose at 2m per proton interaction with wire? C) Energy absorbed in detector? D) Charge generated in the detector? E) Current provided by the detector?

  6. Beam Gauss characterization 1.Estimated Signal by pCVD1.1 Steps to calculate signal: A) Protons interacting with wire by bunch: Bernd’s Calculations: D_wire=30um Sigma_Beam=300um Num_Total_Part_Bunch=1.1e11 N_Total_Interact_Part= 4.38e9 Jose’s Calculations: D_wire=30um Sigma_Beam=300um Num_Total_Part_Bunch=1.1e11 N_Total_Interact_Part= 4.38e9

  7. 1.Estimated Signal by pCVD1.1 Steps to calculate signal: • B) Dose at 2m per proton interaction with wire: • From Fluka Simulations provided by A.Lechner (Thanks!) • Detector dose: • Dose_Detector (Gy) = N_Total_Interact_Part * 2.4e-15 Gy • Dose_Detector (Gy) = 4.38e9* 2.4e-15 = 1.05e-5 Gy

  8. *** Equations used in Bernd's Approximations 1.Estimated Signal by pCVD1.1 Steps to calculate signal: C & D) Energy absorbed in the detector and Charge generation Charge In detector: Qdetector=QperGray * DoseDetector Qdetector=6.93e-6 * 1.05e-5 = 7.23e-11 C

  9. 1.Estimated Signal by pCVD1.1 Steps to calculate signal: E) Current provided by the detector: QBunch=6.93e-6 * 1.05e-5 = 7.23e-11 C IBunch=7.23e-11 / (1.06 + 3.45)e-9 =~ 16 mA

  10. 1.Estimated Signal by pCVD.1.2 Dynamic ExcelSheet (LHC)

  11. 1.Estimated Signal by pCVD.1.3 Initial Estimations for SPS

  12. 1.Estimated Signal by pCVD.1.4 Matlab Script Max Charge (SPS TOTEM) Sigma=180um QpCVD = 120 pC

  13. 2. Conclusions • Development of ExcelSheet & Matlab Script for approximations. • First Estimations of dynamic Range for SPS (150fC up to ~150pC) • Results to be verified & re-checked • Next Steps: • Introduce charge and bunch structure into model • Study the cable modelization and impact of CBH50 (HV) & CK50 (Signal) in detail • Consider the possibility to install pCVD near Scintillators? • Possible to study the system in S parameters domain… • Check different RF Amps with high Dyn. Range (Gali-52+) • Utility of Micro-Stript technology? (GHz freq range)

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