Author: Obina, T.
Paper Title Page
MOPAB091 Injection Section Upgrading with the Septum-Magnet Replacement in KEK-PF Ring 342
 
  • C. Mitsuda, K. Harada, N. Higashi, T. Honda, Y. Kobayashi, H. Miyauchi, S. Nagahashi, N. Nakamura, T. Nogami, T. Obina, M. Tadano, R. Takai, H. Takaki, Y. Tanimoto, T. Uchiyama, A. Ueda
    KEK, Ibaraki, Japan
  
  In 2015, the water leak­age hap­pened at the cool­ing pipe of the in-vac­uum sep­tum mag­net in­stalled into the in­jec­tion point. Be­cause the main­te­nance of the leak­age needed the total re­place­ment of the mag­net, the water cir­cu­la­tion was stopped per­ma­nently, and ac­cord­ingly, the light ab­sorber was in­stalled up­stream in the stor­age ring to pre­vent the syn­chro­tron light of the bend­ing mag­net from com­ing to the sep­tum wall. This treat­ment tem­po­rally worked well, but the beam in­jec­tion ef­fi­ciency was de­creased to about 30% due to the phys­i­cal aper­ture nar­rowed by the ab­sorber. With the de­sired re­place­ment of sep­tum mag­net to main­tain­able out-vac­uum type, the in­jec­tion sec­tion up­grad­ing was si­mul­ta­ne­ously planned to re­cover and im­prove the in­jec­tion ef­fi­ciency. In this up­grade, the in­jec­tion beam is closed to the stored beam more than be­fore by adapt­ing the thin­ner sep­tum struc­ture as a way to im­prove the in­jec­tion ef­fi­ciency. And some new ideas are in­tro­duced in the part of mon­i­tor and beam duct, for ex­am­ple, re­al­time beam mon­i­tor, thin­ner In­conel duct. The de­tailed de­sign of the up­graded in­jec­tion sec­tion and tech­ni­cal points will be re­viewed in this con­fer­ence.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB091  
About • paper received ※ 19 May 2021       paper accepted ※ 26 May 2021       issue date ※ 02 September 2021  
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TUPAB064 Specifications and Performance of a Chicane Magnet for the cERL IR-FEL 1512
 
  • N. Nakamura, K. Harada, N. Higashi, Y. Honda, R. Kato, C. Mitsuda, S. Nagahashi, T. Obina, H. Sakai, M. Shimada, H. Takaki, O.A. Tanaka
    KEK, Ibaraki, Japan
  • Y. Lu
    Sokendai, Ibaraki, Japan
  
  Funding: Work supported by NEDO project "Development of advanced laser processing with intelligence based high-brightness and high-efficiency laser technologies (TACMI project)".
The IR-FEL was con­structed in the Com­pact ERL (cERL) at KEK from Oc­to­ber 2019 to May 2020 for the pur­pose of de­vel­op­ing high-power mid-in­frared lasers for high-ef­fi­ciency laser pro­cess­ing uti­liz­ing mol­e­c­u­lar vi­bra­tional ab­sorp­tion. The chi­cane mag­net was newly in­stalled be­tween two IR-FEL un­du­la­tors in the cERL in order to in­crease the FEL gain and pulse en­ergy by con­vert­ing the en­ergy mod­u­la­tion to the den­sity mod­u­la­tion in an elec­tron bunch. It con­sists of three di­pole mag­nets with lam­i­nated yokes made of 0.1-mm-thick permal­loy sheets and the coil cur­rents of the three mag­nets are in­de­pen­dently con­trolled by three power sup­plies with the max­i­mum cur­rent of 10 A. The max­i­mum closed orbit bump made by the chi­cane mag­netic field has the lon­gi­tu­di­nal dis­per­sion(R56) of -6 mm. The coil-cur­rent ratio of the three di­pole mag­nets was tuned after in­stal­la­tion to make its orbit bumps closed and then the chi­cane mag­net was used in the FEL op­er­a­tion. We pre­sent spec­i­fi­ca­tions and op­er­a­tional per­for­mance of the chi­cane mag­net. 		 
poster icon Poster TUPAB064 [4.053 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB064  
About • paper received ※ 18 May 2021       paper accepted ※ 25 May 2021       issue date ※ 25 August 2021  
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TUPAB099 Construction of an Infrared FEL at the Compact ERL 1608
 
  • R. Kato, M. Adachi, S. Eguchi, K. Harada, N. Higashi, Y. Honda, T. Miyajima, S. Nagahashi, N. Nakamura, K.N. Nigorikawa, T. Nogami, T. Obina, H. Sagehashi, H. Sakai, M. Shimada, T. Shioya, M. Tadano, R. Takai, O.A. Tanaka, Y. Tanimoto, K. Tsuchiya, T. Uchiyama, A. Ueda, M. Yamamoto
    KEK, Ibaraki, Japan
  • R. Hajima
    QST, Tokai, Japan
  • N.P. Norvell
    SLAC, Menlo Park, California, USA
  • F. Sakamoto
    Akita National College of Technology, Akita, Japan
  • M. Shimada
    HSRC, Higashi-Hiroshima, Japan
  
  Funding: Work supported by NEDO project "Development of advanced laser processing with intelligence based high-brightness and high-efficiency laser technologies (TACMI project)".
The com­pact En­ergy Re­cov­ery Linac (cERL) has been in op­er­a­tion at KEK since 2013 to demon­strate ERL per­for­mance and de­velop ERL tech­nol­ogy. Re­cently KEK has launched an in­frared FEL pro­ject with a com­pet­i­tive fund­ing. The pur­pose of this pro­ject is to build a mid-in­frared FEL at the cERL, and to use that FEL as a light source for con­struc­tion of the pro­cess­ing data­base re­quired for in­dus­trial lasers. The FEL sys­tem is com­posed of two 3-m un­du­la­tors and a match­ing sec­tion be­tween them, and gen­er­ates light with a max­i­mum pulse en­ergy of 0.1 mi­cro-J at the wave­length of 20 mi­crons with an 81.25 MHz rep­e­ti­tion rate. The FEL is also ex­pected to be­come a proof-of-con­cept ma­chine for ERL base FELs for fu­ture EUV lith­o­g­ra­phy. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB099  
About • paper received ※ 20 May 2021       paper accepted ※ 14 June 2021       issue date ※ 29 August 2021  
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TUPAB359 Magnetic Field Measurement and Beam Performance Test of Ceramics Chamber with Integrated Pulsed Magnet at KEK-PF 2352
 
  • Y. Lu
    Sokendai, Ibaraki, Japan
  • K. Harada, Y. Kobayashi, C. Mitsuda, S. Nagahashi, T. Nogami, T. Obina, R. Takai, H. Takaki, T. Uchiyama, A. Ueda
    KEK, Ibaraki, Japan
  
  An air-core mag­net named Ce­ram­ics Cham­ber with in­te­grated Pulsed Mag­net(CCiPM) is being de­vel­oped at the pho­ton fac­tory of KEK(KEK-PF), which will have sev­eral ap­pli­ca­tions for the fu­ture light source. One pro­to­type has been de­vel­oped as a di­pole kicker, whose bore is only 30mm. Due to the type and struc­ture, it’s ex­pected to have strong mag­netic field and high rep­e­ti­tion rate. After fin­ish­ing the of­fline mea­sure­ment of mag­netic field and eval­u­a­tion of vac­uum tight­ness, the CCiPM was in­stalled in the beam trans­port-dump line of PF to have an on­line beam per­for­mance and dura­bil­ity test. The re­sults of the mag­netic field mea­sure­ment and beam per­for­mance test will be re­viewed.  
poster icon Poster TUPAB359 [1.164 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB359  
About • paper received ※ 19 May 2021       paper accepted ※ 02 June 2021       issue date ※ 16 August 2021  
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WEXC06
 Eddy Current Effects on the Stored Beam Generated by the Pulsed Sextupole Magnet at KEK-PF  
 
  • H. Takaki, K. Harada, Y. Kobayashi, C. Mitsuda, T. Nogami, T. Obina, R. Takai, T. Uchiyama
    KEK, Ibaraki, Japan
  • Y. Lu
    Sokendai, Ibaraki, Japan
  
  The Pho­ton Fac­tory (KEK-PF) has been con­tin­u­ously de­vel­op­ing new tech­nolo­gies for the top-up in­jec­tion using the pulsed mul­ti­pole mag­nets (PMM). We demon­strated beam in­jec­tion with the PMM suc­cess­fully at KEK-PF and op­er­ated for syn­chro­tron user ex­per­i­ments with top-up in­jec­tion in four years. One of the im­por­tant is­sues to be solved in this in­jec­tion is the ef­fect of eddy cur­rents on the stored beam gen­er­ated in the PMM and its inner coat­ing of the ce­ramic duct. The mag­netic field of the PMM is de­signed so that it does not af­fect the stored beam, how­ever, the eddy cur­rents that oc­curred on the coat­ing give an un­wanted kick to the stored beam at the in­jec­tion. In this paper, we re­port eddy cur­rent ef­fects on the stored beam gen­er­ated by the pulsed sex­tu­pole mag­net.  
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FRXB04 Newly Development of Ceramics Chamber with Integrated Pulsed Magnet for Super-Narrow Bore in KEK-PF 4524
 
  • C. Mitsuda, K. Harada, Y. Kobayashi, S. Nagahashi, T. Nogami, T. Obina, R. Takai, H. Takaki, T. Uchiyama, A. Ueda
    KEK, Ibaraki, Japan
  • K. Hamaji, K. Iwamoto, A. Sasagawa, A. Yokoyama
    KYOCERA Corporation, Higashiomi-city, Shiga, Japan
  • Y. Lu
    Sokendai, Ibaraki, Japan
  
  Ce­ram­ics cham­ber with in­te­grated pulsed mag­net (CCiPM) is a new air-core type mag­net that has a plan to be used as a mul­ti­pole in­jec­tion mag­net, a di­pole in­jec­tion kicker, and a fast cor­rec­tion kicker in the next-gen­er­a­tion light source. The mag­net coils are im­planted com­pletely into the thick­ness of cylin­dri­cal ce­ramic and in­te­grated with ce­ramic struc­turally. The first CCiPM was de­vel­oped for an in­ter­nal di­am­e­ter of 60 mm as a mag­net bore to es­tab­lish the basic pro­duc­tion tech­niques. The tech­nique has been en­hanced to re­al­ize nar­rower bore over 3 years, and fi­nally, the achieved in­ter­nal di­am­e­ters were 40 and 30 mm in newly de­vel­oped CCiPM. These super small bores have an ex­pec­ta­tion to con­form to the size of the vac­uum beam duct in the ring of a fu­ture light source. New CCiPMs are under the off-line test to con­firm the vac­uum dura­bil­ity, elec­tri­cal char­ac­ter­is­tics, and mag­netic per­for­mance, and the beam test for the CCiPM with 30 mm di­am­e­ter has also pro­ceeded in par­al­lel. The points of pro­duc­tion tech­nique and the re­cent re­sults of the off-line test will be pre­sented in this con­fer­ence.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-FRXB04  
About • paper received ※ 19 May 2021       paper accepted ※ 19 July 2021       issue date ※ 31 August 2021  
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