VPT Conditioning and Faceplate losses

Conditioning data

• John Wood - all tube conditioning data and fits

ECAL laser response history, 2011-2012

Public ECAL DPG results, CMS-DP-2012/027 ECAL response variations due to LHC irradiation, link

• laser_history_2011-12.png:
  

Data

Laser data from Federico Ferri, 20.2.2013, email

• tar.gz file in /afs/cern.ch/user/f/ferriff/public/ForDave/
• 20 eta slices. Each .dat file is of the form #x y +dx -dx +dy -dy where x is the time, y is the average response, +/-dx are zero and +/-dy define the band containing 68% of the crystal for the specific region.

Contents of file legend.dat

 eta01 --> -3.0 < eta < -2.7
 eta02 --> -2.7 < eta < -2.4
 eta03 --> -2.4 < eta < -2.1
 eta04 --> -2.1 < eta < -1.8
 eta05 --> -1.8 < eta < -1.5
 eta06 --> -1.5 < eta < -1.2
 eta07 --> -1.2 < eta < -0.9
 eta08 --> -0.9 < eta < -0.6
 eta09 --> -0.6 < eta < -0.3
 eta10 --> -0.3 < eta < 0
 eta11 -->  0.0 < eta < 0.3
 eta12 -->  0.3 < eta < 0.6
 eta13 -->  0.6 < eta < 0.9
 eta14 -->  0.9 < eta < 1.2
 eta15 -->  1.2 < eta < 1.5
 eta16 -->  1.5 < eta < 1.8
 eta17 -->  1.8 < eta < 2.1
 eta18 -->  2.1 < eta < 2.4
 eta19 -->  2.4 < eta < 2.7
 eta20 -->  2.7 < eta < 3.0

Integrated lumi data:

• 2011 luminosity data
• 2012 luminosity data

DaveC analysis 14.5.2013

Initial try to analyse laser response plots to pull out separate VPT and crystal components.
Analysis files:

• legend.dat
• histories-read.C, to make root file from laser history .dat file

EE-

• hist-eta01.dat, -3.0 < eta < -2.7
• history_p2_eta02_1S.dat, -2.7 < eta < -2.4
• history_p2_eta03_1S.dat, -2.4 < eta < -2.1
• history_p2_eta04_1S.dat, -2.1 < eta < -1.8
• history_p2_eta05_1S.dat, -1.8 <eta < - 1.5

EE+

• history_p2_eta16_1S.dat, 1.5 < eta < 1.8
• history_p2_eta17_1S.dat, 1.8 < eta < 2.1
• history_p2_eta18_1S.dat, 2.1 < eta < 2.4
• history_p2_eta19_1S.dat, 2.4 < eta < 2.7
• history_p2_eta20_1S.dat, 2.7 < eta < 3.0

• histories.root

The files to analyse the laser data and extract the VPT and crystal part:

• MyClass.h to read in histories.root
• MyClass.C
• history.C to place text on plot

File histories-read.C reads region hist-eta01.dat with Long64_t nlines = T->ReadFile("hist-eta01.dat","x:y:pdx:mdx:pdy:mdy") and writes file histories.root
This corresponds to eta01 --> -3.0 < eta < -2.7.

Data for VPT response loss estimated from VPT conditioning losses in log book, for eta = 2.9 using estimated pencil curve below link:

• VPT-Crystal-Laser-Response plot:
  

DaveC analysis from December 2012

Set up UVa and Brunel data (up to Dec 2012 at the moment) using file:

• VPT-UVA-Brunel-info.C: VPT-UVA-Brunel-info.C

Then, run plotter for losses vs integrated lumi, for 3 eta bands using file

• VPT-loss-with-eta-and-fb.c: VPT-loss-with-eta-and-fb.c

Notes:

• assume a photo-current of 1 nA at 10³⁴ at 14 TeV at eta = 2.2 from Imrie predictions
• assume a correction factor of 0.8 for flux from 14 TeV to 7-8 TeV
• assume dose factor 7.6 from eta = 2.2 to 2.9
• assume dose factor 0.26 from eta = 2.2 to 1.8
• 5 fb^-1 integrated lumi = 5.10⁵ s at 10³⁴
• Photo-cathode integrated charge is 0.5 mC for 5 fb^-1 assuming 1 nA at 14 TeV at 10³⁴

Resultant conditioning losses if no change in crystal transparency or photo-cathode efficiency, vpt-resp-loss-vs-int-lumi.png:

VPT Faceplate losses

* Feb 2012, P Hobson, VPT faceplate losses from Protons
On slide 7, for Adam Butler's estimates of Jan-March 2014, we assumed 100*10**11 p/cm2 corresponded to a dose of 20 kGy.

-- DavidCockerill - 05 Feb 2014

• vpt-resp-loss-vs-int-lumi.png:
  

• MyClass.C: MyClass.C

• MyClass.h: MyClass.h

• VPT-Crystal-Laser-Response.png:
  

• laser_history_2011-12.png:
  

• Re__Laser_response_vs_time_plot_lab_vs_point_5_comparison.htm: Re__Laser_response_vs_time_plot_lab_vs_point_5_comparison.htm

• legend.dat: legend.dat

• histories-read.C: histories-read.C

• hist-eta01.dat: hist-eta01.dat

• histories.root: histories.root

• MyClass.C: MyClass.C

• history.C: history.C

• VPT-Crystal-Laser-Response.png:
  

• MyClass.C: MyClass.C

• history.C: history.C

• img172.jpg:
  

• VPT_faceplates_Protons_Feb2012.pdf: VPT_faceplates_Protons_Feb2012.pdf

• history_p2_eta02_1S.dat: history_p2_eta02_1S.dat

• history_p2_eta03_1S.dat: history_p2_eta03_1S.dat

• history_p2_eta04_1S.dat: history_p2_eta04_1S.dat

• history_p2_eta05_1S.dat: history_p2_eta05_1S.dat

• history_p2_eta16_1S.dat: history_p2_eta16_1S.dat

• history_p2_eta17_1S.dat: history_p2_eta17_1S.dat

• history_p2_eta18_1S.dat: history_p2_eta18_1S.dat

• history_p2_eta19_1S.dat: history_p2_eta19_1S.dat

• history_p2_eta20_1S.dat: history_p2_eta20_1S.dat