Difference between revisions of "2019-02-01-LeadershipReports"

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Line 83: Line 83:
  
 
'''He Zhang'''
 
'''He Zhang'''
−
* Previous two weeks (Dec 28-Jan 4)
+
  - Previous two weeks (Dec 28-Jan 4)
−
**
+
    - JSPEC code development
−
* Next two weeks (Jan 7 - Jan 11)
+
    - RF Voltage calculation module has been finished and tested. This feature has been merged into the main branch
 +
      and pushed to Github. When the bunch size is chosen to be constant, jspec will calculate the RF voltage with
 +
      respect to the momentum spread at each time step. The voltage is saved in the last row of the user-specified
 +
      output file. When the bunch size is allowed to vary with the momentum spread. The RF voltage is calculated once.
 +
      But it is still saved as above on each time step.
 +
  - Space charge field of the electron bunch results in both the longitudinal velocity shift and the transverse velocity
 +
    shift of the electrons. The longitudinal velocity shift is due to the electrostatic potential difference according to
 +
    the different radius. The transverse one is due to the collective effect of the radial space charge field and the
 +
    longitudinal magnetic field. In the perspective of the friction force calculation, both velocity shifts change the
 +
    relative velocity between the ion and the electron while the transverse one also changes the electron temperature (Larmor
 +
    emittance). With the help of some references, the formulas of the velocity drift for a uniform round electron beam
 +
    (bunched or coasting) are derived and documented. These are good enough for IMP experiment. For a uniform flat beam,
 +
    one may have to do numerical integration. The code is still under development.
 +
  - For the core-tail model, I am working on the multidimensional fitting algorithm using the gradient descent method. 
 +
  - Next two weeks (Jan 7 - Jan 11)
 +
  - Finish the core-tail model and the space charge effect in friction force calculation.
 +
  - Continue documenting JSPEC development.
 +
  - Prepare data, plots, and poster for the DA based kernel independent FMM.
 
**
 
**
  

Revision as of 11:10, 23 May 2019

Accelerator Physics - T. Satogata (CASA Director)
Todd Satogata

  • Previous two weeks (Dec 28 - Jan 4)
  • Next two weeks (Jan 7 - Jan 11)

Alex Bogacz

  • Previous two weeks (Dec 28 - Jan 4)
  • Next two weeks (Jan 7 - Jan 11)

Rui Li

  • Previous two weeks (Dec 28-Jan 4)
  • Next two weeks (Jan 7 - Jan 11)

Edy Nissen

  • Previous two weeks (Dec 28-Jan 4)
  • Next two weeks (Jan 7 - Jan 11)

Chris Tennant

  • Previous two weeks (Dec 28-Jan 4)
  • Next two weeks (Jan 7 - Jan 11)

Accelerator R & D - Y. Zhang

Fanglei Lin

  • Previous two weeks (Dec 28-Jan 4)
  • Next two weeks (Jan 7 - Jan 11)

Vasiliy Morozov

  • Previous two weeks (Dec 28-Jan 4)
  • Next two weeks (Jan 7 - Jan 11)

Amy Sy

  • Previous two weeks (Dec 28-Jan 4)
  • Next two weeks (Jan 7 - Jan 11)

Yuhong Zhang 

 - Previous two weeks (Dec 28-Jan 4)
   - JSPEC code development
   - RF Voltage calculation module has been finished and tested. This feature has been merged into the main branch 
     and pushed to Github. When the bunch size is chosen to be constant, jspec will calculate the RF voltage with 
     respect to the momentum spread at each time step. The voltage is saved in the last row of the user-specified 
     output file. When the bunch size is allowed to vary with the momentum spread. The RF voltage is calculated once. 
     But it is still saved as above on each time step.
  - Space charge field of the electron bunch results in both the longitudinal velocity shift and the transverse velocity 
    shift of the electrons. The longitudinal velocity shift is due to the electrostatic potential difference according to 
    the different radius. The transverse one is due to the collective effect of the radial space charge field and the
    longitudinal magnetic field. In the perspective of the friction force calculation, both velocity shifts change the
    relative velocity between the ion and the electron while the transverse one also changes the electron temperature (Larmor
    emittance). With the help of some references, the formulas of the velocity drift for a uniform round electron beam 
    (bunched or coasting) are derived and documented. These are good enough for IMP experiment. For a uniform flat beam, 
    one may have to do numerical integration. The code is still under development. 
  - For the core-tail model, I am working on the multidimensional fitting algorithm using the gradient descent method.  
 - Next two weeks (Jan 7 - Jan 11)
  - Finish the core-tail model and the space charge effect in friction force calculation. 
  - Continue documenting JSPEC development. 
  - Prepare data, plots, and poster for the DA based kernel independent FMM.

Computational Physics - Y. Roblin

Yves Roblin

  • Previous two weeks (Dec 28-Jan 4)
  • Next two weeks (Jan 7 - Jan 11)

He Zhang 

 - Previous two weeks (Dec 28-Jan 4)
   - JSPEC code development
   - RF Voltage calculation module has been finished and tested. This feature has been merged into the main branch 
     and pushed to Github. When the bunch size is chosen to be constant, jspec will calculate the RF voltage with 
     respect to the momentum spread at each time step. The voltage is saved in the last row of the user-specified 
     output file. When the bunch size is allowed to vary with the momentum spread. The RF voltage is calculated once. 
     But it is still saved as above on each time step.
  - Space charge field of the electron bunch results in both the longitudinal velocity shift and the transverse velocity 
    shift of the electrons. The longitudinal velocity shift is due to the electrostatic potential difference according to 
    the different radius. The transverse one is due to the collective effect of the radial space charge field and the
    longitudinal magnetic field. In the perspective of the friction force calculation, both velocity shifts change the
    relative velocity between the ion and the electron while the transverse one also changes the electron temperature (Larmor
    emittance). With the help of some references, the formulas of the velocity drift for a uniform round electron beam 
    (bunched or coasting) are derived and documented. These are good enough for IMP experiment. For a uniform flat beam, 
    one may have to do numerical integration. The code is still under development. 
  - For the core-tail model, I am working on the multidimensional fitting algorithm using the gradient descent method.  
 - Next two weeks (Jan 7 - Jan 11)
  - Finish the core-tail model and the space charge effect in friction force calculation. 
  - Continue documenting JSPEC development. 
  - Prepare data, plots, and poster for the DA based kernel independent FMM.

Kirsten Deitrick

  • Previous two weeks (Dec 28-Jan 4)
  • Next two weeks (Jan 7 - Jan 11)

Diagnostic Development - K. Jordan

Kevin Jordan

  • Previous two weeks (Dec 28-Jan 4)
  • Next two weeks (Jan 7 - Jan 11)

Joe Gubeli

  • Previous two weeks (Dec 28-Jan 4)
  • Next two weeks (Jan 7 - Jan 11)

Michael Tiefenback

  • Previous two weeks (Dec 28-Jan 4)
  • Next two weeks (Jan 7 - Jan 11)

LERF - S. Benson

  • Previous two weeks (Dec 28-Jan 4)
  • Next two weeks (Jan 7 - Jan 11)

A. Hutton

  • Previous two weeks (Dec 28-Jan 4)
  • Next two weeks (Jan 7 - Jan 11)
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