IPAC2013 - List of Authors (Chou, P.J.)

Paper

Title

Page

Injection Simulations for TPS Storage Ring

1022

C.C. Chiang, P.J. Chou
NSRRC, Hsinchu, Taiwan

We present injection simulations for the TPS (Taiwan Photon Source) storage ring. The baseline lattice of TPS storage ring is a 6-fold structure with 24 double bend cells. For the Step I commissioning, only baseline lattice with dummy chambers are installed. The three double mini-beta-y lattice with insertion devices will be applied during Step II commissioning. The Tracy-2 program is used to simulate the particle motion in 6-D phase space. We adopt lattice models which include errors of alignments and magnet fields. The particle loss due to scraping by chamber limit is recorded in Tracy-2 simulation. We can estimate the radiation distribution of a ring and provide a reference for the shielding design accordingly.

MOPWO059

Development of MATLAB-based Application Programs for the Optics Matching, Beam Steering, and Injection Conditioning in TPS Commissioning

1025

M.-S. Chiu, H.-P. Chang, P.J. Chou, F.H. Tseng
NSRRC, Hsinchu, Taiwan

Taiwan Photon Source (TPS) is a third generation 3GeV synchrotron light source. Its first beam commissioning is scheduled in 2014. Intensive efforts are devoted to achieve efficient transportation of the first beam from the LINAC, passing through the LTB transfer line, and its injection into the booster ring. After the beam energy has been ramped up to 3GeV in booster, the beam is extracted to the BTS transfer line. At the end of BTS, the beam is injected into the storage ring and circulates around the storage ring. In order to achieve efficient beam transportation, we have developed various MATLAB-based commissioning tools for the optics matching of transfer lines, beam steering and injection conditioning of booster and storage ring.

THOBB103

THz Electron-pulse-train Dynamics in a MeV Photo-injector

3109

F.H. Chao, C.H. Chen, Y.-C. Huang
NTHU, Hsinchu, Taiwan
P.J. Chou
NSRRC, Hsinchu, Taiwan

A conventional free electron laser (FEL) is bulky and expensive. In order to quickly build up the FEL power in a short undulator, a laser technology has been proposed to generate a pre-bunched electron pulse-train with a THz bunching frequency from a photoinjector*. The bunching factor** of an accelerated pulse-train beam is influenced by the beam radius, initial bunching frequency, space charge force, acceleration gradient, and acceleration phase in an accelerator. For a given RF accelerator and initial beam parameters, there is a limitation on the maximally attainable bunching factor and bunching frequency for the accelerated pulse-train beam. This paper presents a theoretical analysis for the bunching factor and bunching frequency of an accelerated pulse-train beam subject to nominal initial beam conditions in a photoinjector. The theoretical analysis is compared with the simulation results from the simulation code, PARMELA. To obtain an output bunching factor larger than 0.5%, our simulation study indicates that the maximum bunching frequency at the cathode is 25 THz for a 150 A beam current under a peak acceleration field of 80 MV/m.
* Y.C. Huang, C.H. Chen, A.P. Lee, W.K. Lau, S.G. Liu, NIM, A, 637, S1–S6 (2011).
** Y.C Huang, Appl. Phys. Lett., 96, 231503 (2010).

Slides THOBB103 [3.076 MB]

Paper	Title	Page
MOPWO058	Injection Simulations for TPS Storage Ring	1022
	C.C. Chiang, P.J. Chou NSRRC, Hsinchu, Taiwan
	We present injection simulations for the TPS (Taiwan Photon Source) storage ring. The baseline lattice of TPS storage ring is a 6-fold structure with 24 double bend cells. For the Step I commissioning, only baseline lattice with dummy chambers are installed. The three double mini-beta-y lattice with insertion devices will be applied during Step II commissioning. The Tracy-2 program is used to simulate the particle motion in 6-D phase space. We adopt lattice models which include errors of alignments and magnet fields. The particle loss due to scraping by chamber limit is recorded in Tracy-2 simulation. We can estimate the radiation distribution of a ring and provide a reference for the shielding design accordingly.

MOPWO059	Development of MATLAB-based Application Programs for the Optics Matching, Beam Steering, and Injection Conditioning in TPS Commissioning	1025
	M.-S. Chiu, H.-P. Chang, P.J. Chou, F.H. Tseng NSRRC, Hsinchu, Taiwan
	Taiwan Photon Source (TPS) is a third generation 3GeV synchrotron light source. Its first beam commissioning is scheduled in 2014. Intensive efforts are devoted to achieve efficient transportation of the first beam from the LINAC, passing through the LTB transfer line, and its injection into the booster ring. After the beam energy has been ramped up to 3GeV in booster, the beam is extracted to the BTS transfer line. At the end of BTS, the beam is injected into the storage ring and circulates around the storage ring. In order to achieve efficient beam transportation, we have developed various MATLAB-based commissioning tools for the optics matching of transfer lines, beam steering and injection conditioning of booster and storage ring.

THOBB103	THz Electron-pulse-train Dynamics in a MeV Photo-injector	3109
	F.H. Chao, C.H. Chen, Y.-C. Huang NTHU, Hsinchu, Taiwan P.J. Chou NSRRC, Hsinchu, Taiwan
	A conventional free electron laser (FEL) is bulky and expensive. In order to quickly build up the FEL power in a short undulator, a laser technology has been proposed to generate a pre-bunched electron pulse-train with a THz bunching frequency from a photoinjector. The bunching factor* of an accelerated pulse-train beam is influenced by the beam radius, initial bunching frequency, space charge force, acceleration gradient, and acceleration phase in an accelerator. For a given RF accelerator and initial beam parameters, there is a limitation on the maximally attainable bunching factor and bunching frequency for the accelerated pulse-train beam. This paper presents a theoretical analysis for the bunching factor and bunching frequency of an accelerated pulse-train beam subject to nominal initial beam conditions in a photoinjector. The theoretical analysis is compared with the simulation results from the simulation code, PARMELA. To obtain an output bunching factor larger than 0.5%, our simulation study indicates that the maximum bunching frequency at the cathode is 25 THz for a 150 A beam current under a peak acceleration field of 80 MV/m. * Y.C. Huang, C.H. Chen, A.P. Lee, W.K. Lau, S.G. Liu, NIM, A, 637, S1–S6 (2011). ** Y.C Huang, Appl. Phys. Lett., 96, 231503 (2010).
	Slides THOBB103 [3.076 MB]