E-rhic-ir-l mailing list

[Aschenauer Elke-Caroline <elke AT bnl.gov>]

Dear All,

so here is the summary of what  we need to make progress  on the acceptance simulations, the synchrotron simulations and the impedance calculations.

For both of the electron and the hadron beam we need the beam parameters, i.e. emittance, divergence, beta - functions and so on.

It would be really good if this would be the parameters which are frozen for the pre-CDR.

We got the following table from Vadim, is this the latest?

Attachment: erhic_parameters_v5.1.xlsx
Description: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet

Charles needs for his simulations and design  the following  info

- the information on the ‘bucking’ coils for Q0Fe should be included in the table.

- the beta functions at 5, 5.6, 6.2, 8.7, 10.5 and 15m from the IP on the hadron forward side for 5, 10 and 18 GeV rings.

- the quad strengths (Q0Fe and Q1Fe) for the 5 and 10 GeV rings

- shape of magnet aperture if not round  

  

- for the simulations we need the magnets for both the hadron and electron beams in a format as attached, any divergence 

  from this will mean there are no simulations for the pre-CDR

## 13/2/2017 forward hadrons at 275 GeV/c
## using Palmer's file is beta82cg
## For 'High Luminosity' parameters giving, with electron energy 10.1 GeV, 
Lum = 2.86 10^33
## Plots and other parameters were distributed on 11/2/2017 in a file 1702-IR 
Design-v2.pdf
##
## The design reflects Sergei's shift of B3 to the right by 9.4 m
## A new quad NQ was introduced to better control the betas at R3 and R4
##
## Warning: 
## This design was simulated by a home made program and may not exactly agree 
with
## madX and other codes
## The detector solenoid is not included
## ----------------------------------------------------------
## Initial conditions at IP
##
## beta*_x  beta*_y  g emit_x g emit_y  angle_x  angle_y
##  [m]      [m]      [nm]     [nm]     [mrad]   [mrad]

 0.9440   0.0420   16.1000   6.1000      0      0  
## -----------------------------------------------------------
## magnet parameters
##
##name  center_z center_x center_y radius   length   angle      B      
gradient
##           [m]      [m]      [m]      [m]      [m]    [mrad]     [T]     
[T/m]
##
  B0pf    5.099  -0.0132    0.00   0.1700    1.200   -22.00   -1.700     0.00 
 
  Q1pf    7.289  -0.0284    0.00   0.0370    1.981    -4.00    0.000   -91.54 
 
  B1pf   13.198  -0.0603    0.00   0.0890    4.800     2.80    3.516     0.00 
 
  Q2pf   17.457  -0.0012    0.00   0.1250    2.520    -2.00    0.000    28.41 
 
  Q3pf   37.192   0.3557    0.00   0.0500    1.200    16.20    0.000     0.89 
 
  B2pf   44.091   0.3247    0.00   0.0500    7.800    -1.80   -4.397     0.00 
 
  Q4pf   53.988   0.2567    0.00   0.0500    1.200   -22.00    0.000    28.96 
 
  B3pf   66.185  -0.1760    0.00   0.0500    8.800   -41.80   -4.400     0.00 
 
  NQpf   72.984  -0.4336    0.00   0.0600    1.200   -63.54    0.000   -52.52 
 
  Q5pf   88.380  -1.4088    0.00   0.0400    1.000   -63.47    0.000    55.00 
 
  H1pf   93.754  -1.8350    0.00   0.0500    8.750   -63.45    0.000     0.00 
 
  Q6pf  104.626  -2.4511    0.00   0.0400    2.000   -63.45    0.000    27.50 
 
## x=0, z=0, y=0 is at the center of the IP
## The z axis is aligned with the inital mean hadron direction
## The apertures of B2 and B3 may be too large requiring changes in settings
## H1 is the spin rotator assumed not to focus or bend
## Q5 and Q6 are place holder for strengths to be set by matching
## 
------------------------------------------------------------------------------
##
## parameters at the Roman Pots
##
##loc     Z      beta_x   beta_y   adv_x    adv_y    Disp 
##        [m]    [m]      [m]      rad/pi    rad/pi   {m}
##
  R1      31.00   1197.6   195.70   0.476    0.52    0.205 
  R2      35.00   1208.2   164.58   0.477    0.53    0.253 
  R3      83.55     12.5    12.27   0.597    0.79   -2.051 
  R4      86.40      4.4     5.54   0.722    0.90   -2.404 

## Phase advance x in R3 should be kept to approx 0.6 and may need tweeking
## beta_y          in R3 should be 12 m or more
##--------------------------------------------------------------------------------
## my next iteration will/may: 
## lower beta_x  at B2 and B3 to allow use of RHIC magnets 
## require  a new quad between Current Q1 nd B1 for the VHL case
## a lower beta_x at R3 and R4 to maintain acceptances
## This will presumably be for after the March review

We need the B0 dimensions to see we can install detectors of which dimensions and what number

and it would be good to have the info on the crab-cavities, like a function how the bunch is rotated or so.

Cheers and thanks for providing the info

elke

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