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

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**
 
**
 
'''Yuhong Zhang'''
 
'''Yuhong Zhang'''
* Previous two weeks (Dec 28-Jan 4)
+
  - Previous two weeks (Dec 28-Jan 4)
JSPEC code development
+
    - JSPEC code development
** RF Voltage calculation module has been finished and tested. This feature has been merged into the main branch  
+
    - 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  
+
      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  
+
      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.  
+
      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.
+
      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  
+
  - 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  
+
    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
+
    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
+
    longitudinal magnetic field. In the perspective of the friction force calculation, both velocity shifts change the
  velocity between the ion and the electron while the transverse one also changes the electron temperature (Larmor
+
    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  
+
    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,  
+
    (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.  
+
    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.   
+
  - 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)
+
  - Next two weeks (Jan 7 - Jan 11)
 
**
 
**
  

Revision as of 11:05, 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)

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)
  • Next two weeks (Jan 7 - Jan 11)

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)