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Oscar Adriani INFN Sezione di Firenze - Dipartimento di Fisica dell’Università degli Studi di Firenze Status report of the LHCf experiment: preparation.

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Presentation on theme: "Oscar Adriani INFN Sezione di Firenze - Dipartimento di Fisica dell’Università degli Studi di Firenze Status report of the LHCf experiment: preparation."— Presentation transcript:

1 Oscar Adriani INFN Sezione di Firenze - Dipartimento di Fisica dell’Università degli Studi di Firenze Status report of the LHCf experiment: preparation for data taking Commissione Nazionale Scientifica I Pisa, Settembre 2008

2 18 Settembre 2008CSN1 – Pisa O. Adriani LHCf: location and detector layout INTERACTION POINT IP1 (ATLAS) Beam line Detector II TungstenScintillator Silicon  strips Detector I TungstenScintillator Scintillating fibers 140 m Detectors should measure energy and position of  from  0 decayse.m. calorimeters with position sensitive layers Two independent detectors on both side of IP1 Redundancy Redundancy Background rejection (especially beam-gas) Background rejection (especially beam-gas)

3 18 Settembre 2008CSN1 – Pisa O. Adriani LHCf location Detectors installed in the TAN region, 140 m away from the Interaction Point, in front of luminosity monitors  Here the beam pipe splits in 2 separate tubes.  Charged particle are swept away by magnets!!!  We will cover up to y  

4 18 Settembre 2008CSN1 – Pisa O. Adriani Detector #1 16 scintillator layers (3 mm thick) Trigger and energy profile measurements Absorber 22 tungsten layers 7mm – 14 mm thick (W: X 0 = 3.5mm, R M = 9mm) 4 pairs of scintillating fiber layers for tracking purpose (6, 10, 32, 38 r.l.) Energy Impact point (  ) 2 towers 24 cm long stacked vertically with 5 mm gap Lower: 2 cm x 2 cm area Upper: 4 cm x 4 cm area

5 18 Settembre 2008CSN1 – Pisa O. Adriani Detector # 2 4 pairs of silicon microstrip layers (6, 12, 30, 42 r.l.) for tracking purpose (X and Y directions) We used LHC style electronics and readout 16 scintillator layers (3 mm thick) Trigger and energy profile measurements Absorber 22 tungsten layers 7mm – 14 mm thick (2-4 r.l.) (W: X 0 = 3.5mm, R M = 9mm) 2 towers 24 cm long stacked on their edges and offset from one another Lower: 2.5 cm x 2.5 cm Upper: 3.2 cm x 3.2 cm Energy Impact point (  )

6 18 Settembre 2008CSN1 – Pisa O. Adriani Double ARM Detectors Arm#1 Detector Arm#2 Detector 90mm 290mm

7 18 Settembre 2008CSN1 – Pisa O. Adriani Installation Final installation was completed in January 2008 Final installation was completed in January 2008 No major problems have been found No major problems have been found Both Arm1 and Arm2 are working fine Both Arm1 and Arm2 are working fine No additional noise is found in the detectors, despite 200 m long power lines and signal cables (for the scintillators) No additional noise is found in the detectors, despite 200 m long power lines and signal cables (for the scintillators) The only problem: quartz optical fiber for laser calibration (yet another fiber problem…..) The only problem: quartz optical fiber for laser calibration (yet another fiber problem…..) –The quartz fiber for N2 laser calibration was broken last year during installation –The new fiber was installed in January … but…. –Problems in the connectors installation…. After this….. –Unfortunately we discovered the fiber was the wrong one!!!!!!!!!!!! –New and final installation in the last week free for access (May) –Now is finally OK!

8 18 Settembre 2008CSN1 – Pisa O. Adriani Detectors in place LHCf Luminosity Monitor (BRAN) Monitor (BRAN) ATLAS ZDC Installation performed in two phases: 1.Pre-Installation (2007) Baking out of the beam pipe (200 °C) Baking out of the beam pipe (200 °C) 2.Final Installation (Jan 2008)

9 18 Settembre 2008CSN1 – Pisa O. Adriani Some problems of grounding have been solved….

10 18 Settembre 2008CSN1 – Pisa O. Adriani

11 18 Settembre 2008CSN1 – Pisa O. Adriani Counting room cables clean-up

12 18 Settembre 2008CSN1 – Pisa O. Adriani Front Counter 2 fixed Front Counters were installed in front of Arm1 and Arm2 2 fixed Front Counters were installed in front of Arm1 and Arm2 They will not move with Arm1 and Arm2 They will not move with Arm1 and Arm2 They are segmented in 2 x and 2 y slices They are segmented in 2 x and 2 y slices Very useful to check the beam quality and hence decide to move Arm1 and Arm2 in the operating position from the ‘garage’ position Very useful to check the beam quality and hence decide to move Arm1 and Arm2 in the operating position from the ‘garage’ position

13 18 Settembre 2008CSN1 – Pisa O. Adriani After the installation…. After the installation was completed, a lot of work on: After the installation was completed, a lot of work on: –DAQ New VME board to increase DAQ rate up to > 1 KHzNew VME board to increase DAQ rate up to > 1 KHz Integration of all the subsystem (Using MIDAS frame)Integration of all the subsystem (Using MIDAS frame) Analyzer to check the data quality and online monitorAnalyzer to check the data quality and online monitor –Slow control software to control and monitor: Power suppliesPower supplies ManipulatorManipulator Temperature monitorTemperature monitor –LHC interface New NIM style board (CIBU) to send ‘PERMIT’ to LHC (KILL the beam in case of high rate)New NIM style board (CIBU) to send ‘PERMIT’ to LHC (KILL the beam in case of high rate) Handhshaking software signals (DIP standard) for Injection, Adjust and Beam DumpHandhshaking software signals (DIP standard) for Injection, Adjust and Beam Dump LHCf Physics information (beam position, rate, background etc.)LHCf Physics information (beam position, rate, background etc.)

14 18 Settembre 2008CSN1 – Pisa O. Adriani An Update on the 2007 SPS Beam Test LHCfDetectorSilicon Tracker Tracker Moving Table TriggerScintillator CERN : SPS T2 H4 CERN : SPS T2 H4 August/September 2007 August/September 2007 Incident Particles Incident Particles –Proton 150,350 GeV/c –Electron 50, 100, 150, 200 GeV/c –Muon 150 GeV/c Setup Test was very successful!!!! Energy calibration of the calorimeters Energy calibration of the calorimeters Spatial resolution of the tracking systems Spatial resolution of the tracking systems Results were partially published on JINST: 2008 JINST 3 S08006

15 18 Settembre 2008CSN1 – Pisa O. Adriani Energy Resolution Monte Carlo Energy distribution is corrected for leakage Distance from Edge N Particles MC predicts that the leakage is energy independent! Test Beam

16 18 Settembre 2008CSN1 – Pisa O. Adriani Energy Resolution 2.5 x 2.5 cm 2 tower 2 x 2 cm 2 tower Energy resolution < 3% even for the smallest tower!

17 18 Settembre 2008CSN1 – Pisa O. Adriani Simulation vs Data Energy released in the 4° scintillation layer Simulation is very well understood! 100 GeV e GeV 

18 18 Settembre 2008CSN1 – Pisa O. Adriani  0 reconstruction 9.15 m   350 GeV Proton beam Carbon target (3 cm) in the slot used for beam monitor Arm1 Not in scale! E gamma =18GeV Shower First SciFi Layer Calorimeters 20mm X 40mm X Y Y E gamma =46GeV >10 7 proton on target (special setting from the SPS people) Dedicated trigger on both towers of the calorimeter has been used Dedicated trigger on both towers of the calorimeter has been used

19 18 Settembre 2008CSN1 – Pisa O. Adriani  0 mass reconstruction (MeV) Preliminary!!!!  250  0 events triggered (in a quite big background) and on disk Main problems: Main problems: –low photon energy (≥ 20 GeV) –Direct protons in the towers –Multi hits in the same tower  m ~ 8 MeV  m/m ~ 6%

20 18 Settembre 2008CSN1 – Pisa O. Adriani ARM1 Position resolution σ x [mm] σ y [mm] Number of event x-pos[mm] y-pos[mm] 200 GeV electrons  x =172  m  y =159  m E[GeV]

21 18 Settembre 2008CSN1 – Pisa O. Adriani ARM2 Position Resolution  x =40  m x-pos[mm] y-pos[mm] 200 GeV electrons  y =64  m Alignment has been taken into account

22 18 Settembre 2008CSN1 – Pisa O. Adriani ARM2-Silicon Energy Resolution  E/E ~ 12% Total energy measured in silicon (ADC) 200 GeV electrons SPS beam test data By looking only at the silicon energy measured, we have an energy resolution ~ 10%!!!!! We can use it as a check for the radiation damage of the scintillators

23 18 Settembre 2008CSN1 – Pisa O. Adriani Linearity in the Silicon Energy Correction for energy leakage is not applied At least in the GeV energy range the silicon energy measurement is linear

24 18 Settembre 2008CSN1 – Pisa O. Adriani Preparation for data taking A ‘control room’ …. has been prepared since there was no space for us in the Atlas buildings …. A ‘control room’ …. has been prepared since there was no space for us in the Atlas buildings ….

25 18 Settembre 2008CSN1 – Pisa O. Adriani But our Control Room is fully equipped! FurnituresTelephones Air conditioner NetworkComputersPrinters…… And also with Japanese students!!!!!

26 18 Settembre 2008CSN1 – Pisa O. Adriani Dummy event

27 18 Settembre 2008CSN1 – Pisa O. Adriani Communications with LHC Experimental status (On/Off, Gain, etc.) Experimental status (On/Off, Gain, etc.) Detector position (Garage/Operating, position in mm, etc.) Detector position (Garage/Operating, position in mm, etc.) Luminosity rate (Single and Double Arm) Luminosity rate (Single and Double Arm) –Front Counter rate (single Arm, double Arm coincidence) –Small tower rate (single Arm) –Big tower rate (single Arm) –Double Arm coincidence rate (FC.AND.Towers in opposite sides) Horizontal and Vertical position of the Beam (every events or in the whole RUN) Horizontal and Vertical position of the Beam (every events or in the whole RUN) Injection Inhibit Injection Inhibit Handshaking signals (Injection, Adjust, Beam Dump) Handshaking signals (Injection, Adjust, Beam Dump) LHCf sends signals to LHC through the DIP system. Link have been tested and it works fine! Important for machine tuning! We are in strict contact with them.

28 18 Settembre 2008CSN1 – Pisa O. Adriani We are ready for data taking On September 10 we observed some signals on Front Counters, with Arm1 and Arm2 in garage position for safety reasons On September 10 we observed some signals on Front Counters, with Arm1 and Arm2 in garage position for safety reasons –That day the Atlas BPTX signal was still not available (no info on the real bunches in the Atlas zone) On September 11 Atlas gave us the synchronized BPTX signals, and we could take Front Counter data by using this signal (still in garage position) On September 11 Atlas gave us the synchronized BPTX signals, and we could take Front Counter data by using this signal (still in garage position) We are measuring Beam-Gas from the Beam2 on Arm1 side We are measuring Beam-Gas from the Beam2 on Arm1 side

29 18 Settembre 2008CSN1 – Pisa O. Adriani

30 18 Settembre 2008CSN1 – Pisa O. Adriani ‘Analysis’ of Beam Gas events We got 116 FC triggers in BPTX: N t = protons/bunch Total # of protons: N p =1.7 x We try to estimate the gas density  from this rate: N t =N p * L *  *  L=effective lenght ~ 100 m  =Cross section ~ 80 mbarn = 80 x m 2 We find:  = 8.5 x H/m 3 = 4.2 x H 2 /m 3 From the LHC Project Report #783:  = H 2 /m 3 From the pressure measurement in April 2008:  ~ H 2 /m 3 ~ CONSISTENT!!!!!!!!!!!!!

31 18 Settembre 2008CSN1 – Pisa O. Adriani While waiting for collisions …. Drescher, Physical Review D77, (2008) (2008) A short comment on new models: PICCO, EPOS Very big interest in LHCf data and in this physics field Neutron 0000 Proton

32 18 Settembre 2008CSN1 – Pisa O. Adriani LHCf : Monte Carlo discrimination 10 6 generated LHC interactions  1 Minute 29 cm -2 s -1 luminosity Discrimination between various models Discrimination between various models is feasible in a very short time is feasible in a very short time Quantitative discrimination with the help of a properly defined  2 discriminating variable based on the spectrum shape (see TDR for details) 5% Energy resolution

33 18 Settembre 2008CSN1 – Pisa O. Adriani Conclusions A lot of work has been done in 2008 A lot of work has been done in 2008 Installation completed Installation completed Preparation for running completed Preparation for running completed First beam gas events acquired First beam gas events acquired Will we get collisions today??? Will we get collisions today??? We are ready to send our info to LHC for beam tuning We are ready to send our info to LHC for beam tuning

34 Spare slides

35 18 Settembre 2008CSN1 – Pisa O. Adriani Radiation Damage Studies 30 kGy Expected dose: 100 Gy/day at cm -2 s -1 Expected dose: 100 Gy/day at cm -2 s -1 Few cm -2 s -1 : 10 kGy Few cm -2 s -1 : 10 kGy 50% light output 50% light output Continous monitor and calibration with Laser system!!! Continous monitor and calibration with Laser system!!! Scintillating fibers and scintillators

36 18 Settembre 2008CSN1 – Pisa O. Adriani Estimate of the background beam-beam pipe beam-beam pipe  E γ (signal) > 200 GeV, OK  E γ (signal) > 200 GeV, OK background < 1% beam-gas beam-gas  It depends on the beam condition  It depends on the beam condition background < 1% (under Torr) beam halo-beam pipe beam halo-beam pipe  It has been newly estimated from the beam loss rate  It has been newly estimated from the beam loss rate Background < 10% (conservative value) Background < 10% (conservative value)

37 18 Settembre 2008CSN1 – Pisa O. Adriani Effect of LHCf on BRAN measurement The effect of LHCf on BRAN measurements has been studied in the last months by simulation –Reduction of shower particles at BRAN –Position dependence on beam displacement (question from machine peoples: if we shift by 1 mm the real beam, does the center of the measured neutral energy shifts by 1 mm?) LUMI monitor (BRAN) inside TAN is beyond LHCf (replacing 4th copper bar) LHCf Lumi Cu Bar / ZDC IP1 LHCf Lumi

38 18 Settembre 2008CSN1 – Pisa O. Adriani LHCf performances :  0 geometrical acceptance Arm #1 Arm #2

39 18 Settembre 2008CSN1 – Pisa O. Adriani LHCf performances: energy spectrum of  0 Typical energy resolution of g is 3 % at 1 TeV

40 18 Settembre 2008CSN1 – Pisa O. Adriani ARM1: Maximization of the acceptance for vertical beam displacement (crossing angle>0) ARM2: Maximization of the acceptance in R (distance from beam center) Transverse projection in TAN slot

41 18 Settembre 2008CSN1 – Pisa O. Adriani LHCf: model dependence of neutron energy distribution Original n energy 30% energy resolution


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