公开(公告)号：US20150221467A1

公开(公告)日：2015-08-06

申请号：US14526597

申请日：2014-10-29

Applicant: JEFFERSON SCIENCE ASSOCIATES, LLC

Inventor： David R. Douglas ,  Christopher Tennant

IPC: H01J29/56 ,  H01J29/70

CPC classification number: H05H13/04 ,  H05H2007/005

Abstract: A method for controlling beam quality degradation from ISR and CSR and stabilizing the microbunching instability (μBI) in a high brightness electron beam. The method includes providing a super-periodic second order achromat line with each super period being individually linearly achromatic and isochronous, setting individual superperiod tunes to rational fractions of an integer (such as 4th or 6th integers), setting individual bend angles to be as small as practical to reduce driving terms due to dispersion and dispersive angle, and setting bend radii as large enough to suppress ISR but not negatively affect the radial dependence of CSR. The method includes setting the structure of the individual superperiods to minimize bend plane beam envelope values in the dipoles to reduce betatron response to a CSR event at a dispersed location, increasing beam angular divergence, and creating dispersion nodes in the dipoles to similarly reduce response to CSR events, and limit R56 modulation in order to mitigate μBI.

Abstract translation: 一种用于控制来自ISR和CSR的光束质量退化并稳定高亮度电子束中的微阵列不稳定性（μBI）的方法。 该方法包括提供超周期二阶彩色线，其中每个超级周期是单独的线性消色差和同步的，将单个超周期曲调设置为整数（例如第四或第六整数）的理性分数，将各个弯曲角度设置为小 实际上减少由于色散和色散角度引起的驱动条件，并将弯曲半径设置得足够大以抑制ISR，但不会对CSR的径向依赖性产生负面影响。 该方法包括设置单个超周期的结构以使偶极子中的弯曲平面波束包络值最小化，以减少对分散位置处的CSR事件的反应响应，增加波束角发散度，以及在偶极子中创建分散节点以类似地减小响应 CSR事件，并限制R56调制以减轻μBI。

公开(公告)号：US09408290B2

公开(公告)日：2016-08-02

申请号：US14526597

申请日：2014-10-29

Applicant: JEFFERSON SCIENCE ASSOCIATES, LLC

Inventor： David R. Douglas ,  Christopher Tennant

IPC: H01J29/56 ,  H05H13/04 ,  H05H7/00

CPC classification number: H05H13/04 ,  H05H2007/005

Abstract: A method for controlling beam quality degradation from ISR and CSR and stabilizing the microbunching instability (μBI) in a high brightness electron beam. The method includes providing a super-periodic second order achromat line with each super period being individually linearly achromatic and isochronous, setting individual superperiod tunes to rational fractions of an integer (such as 4th or 6th integers), setting individual bend angles to be as small as practical to reduce driving terms due to dispersion and dispersive angle, and setting bend radii as large enough to suppress ISR but not negatively affect the radial dependence of CSR. The method includes setting the structure of the individual superperiods to minimize bend plane beam envelope values in the dipoles to reduce betatron response to a CSR event at a dispersed location, increasing beam angular divergence, and creating dispersion nodes in the dipoles to similarly reduce response to CSR events, and limit R56 modulation in order to mitigate μBI.

Abstract translation: 一种用于控制来自ISR和CSR的光束质量退化并稳定高亮度电子束中的微阵列不稳定性（μBI）的方法。 该方法包括提供超周期二阶彩色线，其中每个超级周期是单独的线性消色差和同步的，将单个超周期曲调设置为整数（例如第四或第六整数）的理性分数，将各个弯曲角度设置为小 实际上减少由于色散和色散角度引起的驱动条件，并将弯曲半径设置得足够大以抑制ISR，但不会对CSR的径向依赖性产生负面影响。 该方法包括设置单个超周期的结构以使偶极子中的弯曲平面波束包络值最小化，以减少对分散位置处的CSR事件的反应响应，增加波束角发散度，以及在偶极子中创建分散节点以类似地减小响应 CSR事件，并限制R56调制以减轻μBI。

公开(公告)号：US09040936B1

公开(公告)日：2015-05-26

申请号：US14503499

申请日：2014-10-01

Applicant: JEFFERSON SCIENCE ASSOCIATES, LLC

Inventor： David R. Douglas ,  Stephen Benson ,  Dinh Cong Nguyen ,  Christopher Tennant ,  Guy Wilson

IPC: H01J3/12 ,  H01S3/09

CPC classification number: H01S3/0903

Abstract: A method of bunch length compression method for a free electron laser (FEL) that avoids parasitic compressions by 1) applying acceleration on the falling portion of the RF waveform, 2) compressing using a positive momentum compaction (R56>0), and 3) compensating for aberration by using nonlinear magnets in the compressor beam line.

Abstract translation: 一种通过1）在RF波形的下降部分施加加速度的方法，用于避免寄生压缩的自由电子激光束（FEL）的束长度压缩方法，2）使用正动量压缩（R56> 0）进行压缩，以及3） 通过在压缩机束线中使用非线性磁体来补偿像差。

公开(公告)号：US09184022B2

公开(公告)日：2015-11-10

申请号：US14526616

申请日：2014-10-29

Applicant: JEFFERSON SCIENCE ASSOCIATES, LLC

Inventor： David R. Douglas ,  Christopher Tennant

IPC: G21K5/04 ,  H01J37/147

CPC classification number: H01J37/147 ,  H01J2237/049 ,  H01J2237/152 ,  H05H7/04 ,  H05H13/04 ,  H05H2007/043

Abstract: A modulated-bending recirculating system that avoids CSR-driven breakdown in emittance compensation by redistributing the bending along the beamline. The modulated-bending recirculating system includes a) larger angles of bending in initial FODO cells, thereby enhancing the impact of CSR early on in the beam line while the bunch is long, and 2) a decreased bending angle in the final FODO cells, reducing the effect of CSR while the bunch is short. The invention describes a method for controlling the effects of CSR during recirculation and bunch compression including a) correcting chromatic aberrations, b) correcting lattice and CSR-induced curvature in the longitudinal phase space by compensating T566, and c) using lattice perturbations to compensate obvious linear correlations x-dp/p and x′-dp/p.

Abstract translation: 一种调制循环系统，通过沿着光束线重新分布弯曲，避免了CSR驱动的发射补偿击穿。 调制弯曲循环系统包括：a）在初始FODO单元中具有较大的弯曲角度，从而在束长时间增强了束线中CSR的冲击，以及2）最终FODO单元中弯曲角度减小 企业社会责任的影响很小。 本发明描述了一种用于控制再循环和束压缩期间CSR的影响的方法，包括：a）校正色差，b）通过补偿T566校正纵向相位空间中的晶格和CSR引起的曲率，以及c）使用晶格扰动来补偿明显的 线性相关性x-dp / p和x'-dp / p。

公开(公告)号：US20150228444A1

公开(公告)日：2015-08-13

申请号：US14526616

申请日：2014-10-29

Applicant: JEFFERSON SCIENCE ASSOCIATES, LLC

Inventor： David R. Douglas ,  Christopher Tennant

IPC: H01J37/147

CPC classification number: H01J37/147 ,  H01J2237/049 ,  H01J2237/152 ,  H05H7/04 ,  H05H13/04 ,  H05H2007/043

Abstract: A modulated-bending recirculating system that avoids CSR-driven breakdown in emittance compensation by redistributing the bending along the beamline. The modulated-bending recirculating system includes a) larger angles of bending in initial FODO cells, thereby enhancing the impact of CSR early on in the beam line while the bunch is long, and 2) a decreased bending angle in the final FODO cells, reducing the effect of CSR while the bunch is short. The invention describes a method for controlling the effects of CSR during recirculation and bunch compression including a) correcting chromatic aberrations, b) correcting lattice and CSR-induced curvature in the longitudinal phase space by compensating T566, and c) using lattice perturbations to compensate obvious linear correlations x-dp/p and x′-dp/p.

Abstract translation: 一种调制循环系统，通过沿着光束线重新分布弯曲，避免了CSR驱动的发射补偿击穿。 调制弯曲循环系统包括：a）在初始FODO单元中具有较大的弯曲角度，从而在束长时间增强了束线中CSR的冲击，以及2）最终FODO单元中弯曲角度减小 企业社会责任的影响很小。 本发明描述了一种用于控制再循环和束压缩期间CSR的影响的方法，包括：a）校正色差，b）通过补偿T566校正纵向相位空间中的晶格和CSR引起的曲率，以及c）使用晶格扰动来补偿明显的 线性相关性x-dp / p和x'-dp / p。

公开(公告)号：US20150162720A1

公开(公告)日：2015-06-11

申请号：US14503499

申请日：2014-10-01

Applicant: JEFFERSON SCIENCE ASSOCIATES, LLC

Inventor： David R. Douglas ,  Stephen Benson ,  Dinh Cong Nguyen ,  Christopher Tennant ,  Guy Wilson

IPC: H01S3/09

CPC classification number: H01S3/0903

Abstract: A method of bunch length compression method for a free electron laser (FEL) that avoids parasitic compressions by 1) applying acceleration on the falling portion of the RF waveform, 2) compressing using a positive momentum compaction (R56>0), and 3) compensating for aberration by using nonlinear magnets in the compressor beam line.

Abstract translation: 一种通过1）在RF波形的下降部分施加加速度的方法，用于避免寄生压缩的自由电子激光束（FEL）的束长度压缩方法，2）使用正动量压缩（R56> 0）进行压缩，以及3） 通过在压缩机束线中使用非线性磁体来补偿像差。