# Presentation: 506900

## System Modeling and Beam Commissioning

- Howard Matis
- Lawrence Berkeley National Laboratory
- August 2, 2007

- August 2007 LUMI Review

- H. Matis

## Outline

- Past Simulations
- Recent Progress
- Future Plans
- Beam Commissioning

- August 2007 LUMI Review

- H. Matis

## Neutrals on the TAN

*From** **Baseline and Requirements for a Luminosity Monitoring at the LHC. Gschwendtner and M. Placidi – CERN internal note 2004*
- Crossing Angle – 300 μrad
- Luminosity – 1034 cm-2s-1
- Mars Calculation

- August 2007 LUMI Review

- H. Matis

## Shower Structure

- LUMI located ~ 13? & 40? cm
- Near EM Shower maximum
- Need to reproduce these calculations
- With all detectors in place
- LHCf (in and out)
- Study performance of our detector

**Howard Matis:**
**Get real z value of LUMI**

- August 2007 LUMI Review

- H. Matis

## Particles Incident on Tanfrom Gschwendtner and M. Placidi 

- August 2007 LUMI Review

- H. Matis

## Chamber Propertiesfor 8 atm

***Calculation by W. Turner - CBP Tech Note 352 - rev Jan 07***

- August 2007 LUMI Review

- H. Matis

## TAN power deposition (W/kgm)

-  Peak power density 1-10 W/kgm (location of ionization chamber)
-  A 3 m radiation hard cable will allow electronics to be located in a region with power density < 10-5 W/kg × m (100 Gy/oper yr)

*Calculation by N. Mokhov*

- August 2007 LUMI Review

- H. Matis

## Simulations

- FLUKA and MARS running on our computer lumi.lbl.gov
- Want to do detailed shower calculations in BRAN
- Intend to pursue a collaborative approach to model TAN detectors
- Summer student working on MARS and FLUKA simulations
- Cory Fantasia - Northeastern
- Just started to model TAN geometry
- Work in Progress!

- Diagrams arenot to scale

- August 2007 LUMI Review

- H. Matis

## Have Prototype Particle Files

- Vadim Talanov generated a set of particles from p-p events for IR5
- 7 TeV
- Crossing angle 285 μrad
- Used by experimenters with detectors in the TAN
- Cross check results
- Files are limited
- Not decayed to final states
- No interactions in upstream material
- Need model of beam background

- 25 93 7 ! Event No., N_tot, N_final_state
-   8  1  0.183973306604E-03  0.247751800125E-04  0.517128155761E+04
-  23  1 -0.155325222794E-03  0.406376086292E-03  0.405663086248E+03
-  15  1  0.535811477948E-03 -0.142392838037E-03  0.225543042826E+03
-  15 -1  0.234322479101E-03  0.152241941041E-03  0.196284954630E+04
-  14 -1 -0.183516130010E-03  0.157082379796E-03  0.964152295086E+03
-  17 -1  0.280746099534E-03  0.162109034533E-03  0.256312640588E+04
-  23 -1  0.228731692705E-03  0.176233074520E-03  0.120028134998E+04
-  26 124 10 ! Event No., N_tot, N_final_state
-   1 -1 -0.172474748208E-03  0.469470900729E-04  0.629644882568E+04
-   7  1 -0.515929555257E-03 -0.527647695893E-03  0.470595005240E+03
-  23  1  0.473701835404E-03  0.145747626902E-03  0.868111819420E+03
-   1  1 -0.335575358091E-03 -0.384542838725E-03  0.885221518324E+03
-  13  1 -0.501718521355E-03 -0.507251122603E-04  0.536621086941E+03
-  14  1 -0.666031462414E-04 -0.314638452091E-03  0.482653775782E+03
-  13  1  0.471235990849E-03  0.377949073251E-03  0.376003403622E+03
-  23  1  0.669748771951E-03  0.182323166507E-03  0.734271066534E+03
-  14  1  0.142333240081E-03  0.289639827211E-03  0.171460221915E+04
-  23  1 -0.124880104966E-03 -0.643676492367E-03  0.355640678326E+03

- August 2007 LUMI Review

- H. Matis

## Future Work

- Finish MARS simulation
- Extend to FLUKA and compare
- Both simulations can use common geometry files
- Using common input files
- Consider going to GEANT
- Might be needed to understand event by event data
- Crossing angle studies
- Need to full characterize detector

- August 2007 LUMI Review

- H. Matis

## Remote Commissioning at RHIC

- 2006 p-p run
-  four people
- April three people
- May and June one person at BNL at a time
- Added limited remote DAQ capability
- Reduced travel costs
- Travel stress
- During the last week
- Alex at BNL
- HM at LBNL and home
- Alex would talk over phone with Berkeley team
- I could take data remotely
- Take data
- Took a crossing angle scan
- Could not change cables
- Valuable experience for LHC

- August 2007 LUMI Review

- H. Matis

## Precommissioning at LHC

- Two trips to CERN this year
- Fully trained
- Working with LBL engineer living at CERN
- Fredric Gicquel
- Test installation at all locations
- Discuss alignment
- Measure cables
- Plan installation
- Next 9 months installation of full detector
- Development of LabVIEW software and FPGA Code
- Interface to LHC control system

- August 2007 LUMI Review

- H. Matis

## Stages to Maximum LHC LuminosityCERN EDMS 347396

| Mode | Bunches | Bunch Spacing | Luminosity [cm-2 s-1] | Interactions/Xsing | Mean pulse height/occupied bunch Xsing - V |
| --- | --- | --- | --- | --- | --- |
| A–Collision studies with single pilot bunch beam - no crossing angle | 1 | N/A | 2.51026 - 3.71027  | 0.00-0.03 | 0.0002-0.00267 |
| B–Collision studies with single higher intensity bunch - no crossing angle | 1 | N/A | 1.11029 - 4.31030 | 0.78-30.6 | 0.079-3.10 |
| C–Early p-p luminosity | 43 | 2.025 μs | 4.81030 - 8.41031 | 0.8-13.9 | 0.080-1.41 |
|  | 2808 | 25 ns | 6.51032 | 1.65 | 0.167 |
|  | 936 | 75 ns | 1.81033 | 13.7 | 1.39 |
| D–Nominal p-p luminosity | 2808 | 25 ns | 1.01034 | 25.3 | 2.57 |
| E–Ultimate p-p luminosity | 2808 | 25 ns | 2.31034 | 58.3 | 5.91 |

*Pressure = 6 atm*

- August 2007 LUMI Review

- H. Matis

## Procedure to Get Detector Ready

- A–Collision studies with single pilot bunch beam - no crossing angle
- Collision rate too low to use as a luminosity monitor
- Minimize noise
- Get baseline software and hardware ready
- B–Collision studies with single higher intensity bunch - no crossing angle
- Start in pulse counting mode
- Transition to pulse height mode
- Develop crossing angle algorithms
- Need sustained presence at CERN
- C–Early p-p luminosity
- Develop deconvolution algorithms
- May need deconvolution for this phase
- Use crossing angle measurements
- Can do pulse counting for most of this period
- Develop pulse height mode algorithms
- D–Nominal p-p luminosity
- Pulse height mode
- Deconvolute
- Detector needs to fully commissioned with gas flow
- E–Ultimate p-p luminosity
- Might need to lower pressure to reduce voltage

- August 2007 LUMI Review

- H. Matis

## Summary

- Beginning Modeling studies
- Commissioning of detector started
- Building relationships with CERN
- Ready for LHC beam in Spring 2008

- August 2007 LUMI Review

- H. Matis