ILC beam parameters and beamstrahlung information

Last update: 13 October, 2009

ILC Beam parameters

■ SB2009 parameter(revised: 2009/10/13)

Documents
- SB2009 proposal document Working assumptions for ALCPG, Summary report of the first meeting on Accelrator Design & Integration, 23-29, May, DESY
- Progress Towards the New for the ILC, presented by Nicholas Walker at ALCPG2009, 29 September, 2009. Parameters are shown in page 13.
CAIN: Reslts and data, using CAIN240
Note:Initial energy spread is not included. Data will be updated when SB2009 500 GeV parameter is updated.)
- 500 GeV without travelling focus
  input job log tdr tdr-pdf
  ♦Background event data (one bunch ) :
  - Incoherent pair [ascii,stdhep]
  - beamstrahlung[ascii]
  - electron[ascii]
  - positron[ascii]
- 500 GeV with travelling focus
  input job log tdr tdr-pdf
  ♦Background event data (for one bunch ) :
  - Incoherent pair[ascii,stdhep]
  - Beamstrahlung[ascii]
  - Electron[ascii]
  - Positron[ascii]
  More samples up to 100 bunches will be found at
  - http://greentea.kek.jp/data/soft/samples/cain/sb2009/500.wTF/[dat],[stdhep] (Each file corresponds to one bunch of backgrounds )
  - Samples in stdhep format are also available on the GRID at lfn:/grid/ilc/users/miyamoto/samples/gen/cain/sb2009/500.wTF/stdhep
- Comparison of spectrum
  Spectrum of differential luminosity, energy of coherent pairs, and energy of beamstrahlung photon are compared among following ILC beam parameters: RDR 500 nominal, RDR 500 lowP, SB2009 without traveling focus, and SB2009 with traveling focus.
  - Differential Luminosity (Note: initial energy spread is not take into account. Bin width was revised in 14-Oct-2009).
    The differential luminosities at peak bin are as follows:
    
    RDR-Nominal 1.2015E34 cm^-2s^-1/2.5GeV
    
    RDR-LowP 0.88824E34
    
    SB2009-without Traveling Focus 0.73901E34
    
    SB2009-with Traveling Focus 0.9620E34
  - Energy spectrum of coherent pair
  - Energy spectrum of beamstrahlung photon
Beamstrahlung data and function

■RDR ILC beam parameters

CAIN: Results

•

CM energy(GeV)	90	200	250	350	500	1000
	input	input	input	input	input	input
	job log	job log	job log	job log	job log	job log
	tdr	tdr	tdr	tdr	tdr	tdr
	tdr-figs	tdr-figs	tdr-figs	tdr-figs	tdr-figs	tdr-figs

Information prepared by ILC-BDS group
Beamstrahlung data and function

Beamstrahlung data for BSGEN
(These data are will be found at jlclogin2.kek.jp:/proj/soft/data5/samples/gen/bsdata or lfn:/grid/ilc/users/miyamoto/samples/gen/bsdata of ILC VO GRID)

■About CAIN

CAIN 235 source code, which was used for CAIN calculation
Cain235 manual
http://lcdev.kek.jp/~yokoya/CAIN/ (K.Yokoya's CAIN site )

BSGEN information

■ How to use

Example to use BSGEN will be found in the example of JSF package, JSF/src/generators/bsgen. genbeam.C and genbeam2.C are examples used to generate spectrum for comparison of luminosity spectrum shown above.

For PythiaGenerator implemented in JSF, set following variables properly.

PythiaGenerator.BeamStrahlung: 1 
#  1 = to use BSGEN spectrum, 0 = not use

PythiaGenerator.BSParameter:  file_name
#   File name of BSDATA file.  For example, 500_nominal
#    in the case of nominal data at 500 GeV, 500_nominal.root
#   These files must be in the directory, $JSFROOT/data/bsdata 

PythiaGenerator.BSFileName:  500_nominal.root
#   File name of BSDATA file.  For example, 500_nominal
#    in the case of nominal data at 500 GeV, 500_nominal.root


JSFBeamGeneration.Width: 0.0005
#  A half width of initial beam energ spread.
#  As a default, energy spread is uniform
#  A value of 0.0005 corresponds to the energy spread of 
#  0.1% in full width
#

■ References to the method

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Contact: akiya.miyamoto at kek.jp

RDR-Nominal	1.2015E34 cm^-2s^-1/2.5GeV
RDR-LowP	0.88824E34
SB2009-without Traveling Focus	0.73901E34
SB2009-with Traveling Focus	0.9620E34