λΠϛϯάγεςϜͷ֓೦ͱ࣮૷
J-PARC ηϯλʔాଜจ඙ ∗

Δɻ‫୹ۃ‬ύϧεͷࣗ༝ిࢠϨʔβʔͷͨΊͷి

1 ͸͡Ίʹ

ࢠ linac ͱόϯν௕͕਺ඦ ns Ͱ͋ΔཅࢠγϯΫJ-PARC [1] ͸ linacɺrapid cycling syn-ϩτϩϯ͸τϦΨʔͷδολʔʹର͢Δཁ‫ٻ‬͸chrotron (RCS)ɺmain ring (MR) ͷ 3 ͭͷԿܻ΋ҟͳΔ͠ɺ์ࣹޫϦϯάͷΑ͏ͳ஝ੵϦେ‫౓ڧ‬ཅࢠՃ଎‫ͱث‬෺࣭ɾੜ໋Պֶ࣮‫ࢪݧ‬ઃϯάͱɺҰఆͷप‫ظ‬Λ࣋ͭγϯΫϩτϩϯͰ͸ɺ(MLF)ɺχϡʔτϦϊ࣮‫ࢪݧ‬ઃɺϋυϩϯ࣮‫ݧ‬τϦΨʔΛ͍ͭൃੜͤ͞Δ͔ʹ͍ͭͯͷߟ͑ํࢪઃͷ 3 ͭͷ࣮‫ࢪݧ‬ઃʹΑΓߏ੒͞ΕΔɻ2006͕શ͘ҧ͏ɻ

೥ͷ linac ௐ੔։࢝Ҏདྷɺ‫ܧ‬ଓతͳϏʔϜௐ੔͓Αͼϋʔυ΢ΣΞͷ૿‫ʹڧ‬ΑΓɺRCS ͓Αͼ

2 J-PARC ͷλΠϛϯάνϟʔτMR ͷϏʔϜग़ྗ͸૿େΛଓ͚͖ͯͨɻ2018 ೥

J-PARC ͷେ͖ͳӡసप‫ظ‬ΛܾΊ͍ͯΔͷ͸

6 ݄‫ࡏݱ‬ɺMLF ར༻ӡసͷͨΊͷ RCS ϏʔϜMR Ͱ͋ΔɻMR ͸଎͍औΓग़͠ (fast extrac-ύϫʔ͸ 500 kW ʹୡ͠ɺχϡʔτϦϊ࣮‫΁ݧ‬tionɺFX) ϞʔυͰ͸ 2.48 ඵɺ஗͍औΓग़͠޲͚ͨ MR ϏʔϜύϫʔ͸ 490 kW Ͱ͋Δɻ͜

(slow extraction, SX) ϞʔυͰ͸ 5.2 ඵͷप‫ظ‬ͷΑ͏ͳେ‫౓ڧ‬ϏʔϜՃ଎ʹ͓͚ΔॏཁͳཁૉͰɺRCS ͔Βೖࣹ͞Εͨ 3 GeV ͷཅࢠϏʔϜͷͻͱ͕ͭλΠϛϯάγεςϜͰ͋ΔɻΛ 30 GeV ·ͰՃ଎͠ɺFX ϞʔυͰ͸χϡʔλΠϛϯάγεςϜͱฉ͍ͯͦͷ໾ׂΛߟ͑τϦϊ࣮‫ࢪݧ‬ઃʹɺSX ϞʔυͰ͸ϋυϩϯ࣮ͨͱ͖ʹɺ࠷ॳʹߟ͑ͭ͘ͷ͸ɺ‫ثػ‬ͷಈ࡞΍‫ࢪݧ‬ઃʹϏʔϜΛ‫͍ͯ͠څڙ‬ΔɻMR ͷλΠϛଌఆͷ‫ج‬४ͱͳΔτϦΨʔ΍ήʔτΛੜ੒͢Δ

ϯάνϟʔτΛ ਤ 1 ʹࣔ͢ɻMR ͷओి࣓ੴ

͜ͱͩΖ͏ɻਖ਼֬ͳτϦΨʔͷൃੜ͸Ճ଎‫ث‬ͷ

͸ 3 GeV ʹରԠ͢Δ࣓৔ͰϑϥοτϘτϜΛ࣋ӡసʹෆՄܽͰ͋Δ͜ͱ͸౰વͰ͋Δɻ͔͠͠ɺ

ͪɺ͜ͷϑϥοτϘτϜͷؒʹ RCS ΑΓ 2 όϯJ-PARC ͷΑ͏ͳେ‫ܕ‬Ճ଎‫͍͓ͯʹث‬͸ɺτνͣͭ 4 ճͷϏʔϜೖࣹΛߦ͍஝ੵͨ͠ϏʔϜϦΨʔɺήʔτੜ੒Ҏ֎ͷ‫ػ‬ೳ΋ඞཁʹͳͬͯΛՃ଎͢Δɻ4 ճͷೖࣹλΠϛϯάΛ K1ɺK2ɺ

͘Δɻ

K3ɺK4 ͱ‫ݺ‬ΜͰ͍Δɻ͜ͷʮKʯ͸ɺೖࣹʹࡍ͜ͷߨٛϊʔτͰ͸ɺJ-PARC ͷλΠϛϯά

͠ྭ࣓͞ΕΔೖࣹΩοΧʔͷʮKʯͰ͋ΓɺK λγεςϜͷߏ੒͓Αͼ‫ػ‬ೳΛઆ໌͠ɺͦΕ͕ͲΠϛϯάͷִؒ͸ɺRCS ͷप‫ظ‬ͷ 40 ms Ͱ͋ͷΑ͏ͳ֓೦ɺཁ‫͍ͯͮجʹٻ‬ઃ‫͞ܭ‬Ε͍ͯΔ

Δɻओి࣓ੴύλʔϯͷʮPʯΛऔͬͯɺύλʔͷ͔Λઆ໌͍ͯ͘͠ɻ

ϯͷ։࢝Λ P0ɺೖࣹ։࢝λΠϛϯάΛ P1ɺՃཹҙͯ͠΄͍͠ͷ͸ɺλΠϛϯάʹؔ͢Δཁ

଎։࢝Λ P2ɺՃ଎ऴྃΛ P3ɺ‫ݮ‬଎։࢝ (ϑϥο‫ٻ‬͸Ճ଎‫ࢪث‬ઃ͝ͱʹҟͳΔͱ͍͏͜ͱͰ͋

ττοϓͷऴྃ) Λ P4 ͱ‫Ϳݺ‬ɻ‫ࡏݱ‬ͷӡసͰ͸ɺP0 ͔Β P1 ·Ͱ͸ 10 msɺP1 ͔Β P2 ·∗ fumihiko.tamura@j-parc.jp

Ͱ͸ 130 msɺP2 ͔Β P3 ·Ͱɺͭ·Γ࣮ࡍʹ

10－ 1

P4

P3

30GeV

MR magnet pattern
P0 P1
K1

P2
K2

40ms

K3

3GeV

K4

typ 1400ms
to be shorten to 650ms

ਤ 1: MR ͷλΠϛϯάνϟʔτɻ

extractionՃ଎͕ߦΘΕΔ‫ؒظ‬͸ 1.4 ඵ ͱͳ͍ͬͯΔɻ‫ݱ‬ࡏɺฏ‫ۉ‬ϏʔϜύϫʔΛେ෯ʹ૿Ճ͢ΔͨΊʹMR ͷӡసप‫ظ‬Λ 1.32 ඵʹ୹͔͘͢Δ‫ܭ‬ը͕

RCS magnet ﬁeld

͋Δ͕ɺ͜Ε͸ P2–P3 ؒΛ 0.65 ඵʹ୹ॖ͢Δ
͜ͱͰ࣮‫͞ݱ‬ΕΔɻFX ϞʔυͰ͸ɺՃ଎͞Εͨ

Bmax

20ms

8 ͭͷόϯνΛΩοΧʔి࣓ੴʹΑΓҰ౓ʹऽΓग़ͨ͢Ίɺϑϥοττοϓ௕ (P3 ͔Β P4) ͸

1 ms ʹઃఆ͞Ε͓ͯΓɺSX ϞʔυͰ͸ϑϥοBminττοϓ‫ؒظ‬தʹΏͬ͘Γ (2 ඵఔ౓) ϏʔϜΛbeam injection
from linac (500us)औΓग़͍ͯͨ͘͠ΊʹɺͦΕʹԠͨ͡ϑϥοττοϓ௕ (2.61 ඵ) ͱͳ͍ͬͯΔɻ

RCS ͷλΠϛϯάνϟʔτΛਤ 2 ʹࣔ͢ɻ
RCS ͸ 25 Hz ͷ‫܁‬Γฦ͠प೾਺ɺͭ·Γ 40 ms

bump magnets

ͷӡసप‫ظ‬Λ࣋ͪɺ20 ms ͷؒʹཅࢠϏʔϜΛਤ 2: RCS ͷλΠϛϯάνϟʔτɻ

400 MeV ͔Β 3 GeV ·ͰՃ଎͢ΔɻRCS ͷओి࣓ੴ͸‫ʹݯిৼڞ‬ΑΓαΠϯ೾తʹྭ࣓͞Εɺ࠷খɺ࠷େͱͳΔλΠϛϯάΛ BminɺBmax ͱ‫Ϳݺ‬ɻLinac ͔Βೖࣹ͞ΕΔ H− ϏʔϜ͸ՙి

Δɻલड़ͷΑ͏ʹɺMR प‫ظ‬ͷதͰ 4 ճ͸ MRม‫׵‬ບʹΑΓཅࢠϏʔϜʹม‫͞׵‬ΕɺBmin ͷʹϏʔϜΛૹΓɺͦΕҎ֎ɺFX ϞʔυͰ͋Εલ‫ ޙ‬250 µsɺ500 µs ʹΘͨΓ 307 λʔϯ͔͚͹ 58 ճɺSX ϞʔυͰ͋Ε͹ 126 ճͷϏʔϜ͸ͯೖࣹ͞ΕΔɻ͜ͷ෇ۙͰ͸ɺೖࣹϖΠϯτό

MLF ʹૹΒΕΔɻ͜ͷৼΓ෼͚͸ɺRCS Λग़ϯϓి࣓ੴ͕ྭ࣓͞Εɺਫฏ͓Αͼਨ௚ํ޲ʹͨ‫ޙ‬ͷϏʔϜτϥϯεϙʔτʹ͋Δύϧεภ޲ೖࣹϖΠϯςΟϯά͕ߦΘΕΔɻ໿ 20 ms ͔͚ి࣓ੴΛ MR ೖࣹͷ‫࣓͢ྭ͚ͩؒظ‬Δ͜ͱͰߦͯ 3 GeV ·ͰՃ଎͞ΕͨཅࢠϏʔϜ͸औΓग़ΘΕΔɻ

RCS ʹ͓͍ͯɺMLF ߦ͖ͷϏʔϜͱ MR ߦ͠ΩοΧʔి࣓ੴʹΑΓϦϯά͔ΒऽΓग़͞Ε͖ͷϏʔϜͰ͸ɺϏʔϜ‫͘ͳͰ͚ͩ౓ڧ‬ɺೖࣹ

10－ 2

DTQ
(pulse mode)• ࡉ͔͍‫ج‬४͸ linac ͓Αͼ RCS ͷ 25 HzͰ͋ΓɺTEF ‫ݐ‬ઃ‫ޙ‬͸ linac ͷ 50 Hz~10ms• MR ͷप‫ظ‬͸ɺRCS प‫ظ‬ͷ੔਺ഒͰͳ͚ΕRF pulse͹ͳΒͳ͍

600800us
beam
macro pulseͱ͍͏͜ͱ͕Θ͔Δɻ

50500usγϯΫϩτϩϯ (RCSɺMR) Ͱ͸ RF प೾਺ਤ 3: Linac ͷλΠϛϯάνϟʔτɻ͸ MHz ͷྖҬͰ͋Γɺόϯν௕͸਺ඦ ns ͔Β࠷୹Ͱ 50 ns ఔ౓Ͱ͋ΔͨΊɺτϦΨʔ΍ήʔϖΠϯςΟϯάͷ৚݅ɺRF प೾਺ύλʔϯͳͲɺ༷ʑͳ৚͕݅ҟͳΔɻͭ·ΓɺλΠϛϯά
γεςϜ͸֤छՃ଎‫ʹثػث‬ɺߦ͖ઌʹԠͨ͡ద੾ͳࢦࣔΛ༩͑ͳ͚Ε͹ͳΒͳ͍ɻ

Linac ͷλΠϛϯάνϟʔτΛਤ 3 ʹࣔ͢ɻ
RCS ಉ༷ʹɺ25 Hz ‫܁‬Γฦ͠Ͱӡస͞Ε͍ͯ
Δ͕ɺ֩ม‫ࢪݧ࣮׵‬ઃ (TEFɺTransmutation

Experimental Facility) ͕‫ݐ‬ઃ͞ΕΔͱɺRCSτͷδολʔ (͹Β͖ͭ) ͸ 1 ns ΛԼճ͍ͬͯ
Ε͹े෼Ͱ͋ΔɻҰํɺlinac ͷՃ଎प೾਺͸

324 MHz ͓Αͼ 972 MHz Ͱɻۭಎؒͷ૬ରతͳҐ૬͸ඇৗʹਫ਼౓ྑ͘؅ཧ͞Εͳ͚Ε͹ͳΒͳ͍͕ɺλΠϛϯάγεςϜ͔Β‫͞څڙ‬ΕΔτ
ϦΨʔ΍ήʔτʹ͍ͭͯ͸ɺγϯΫϩτϩϯಉ༷ʹ 1 ns ҎԼͷਫ਼౓Ͱे෼Ͱ͋Δɻ

3 J-PARC ͷλΠϛϯάγεςϜ

ߦ͖ͷϏʔϜͱ TEF ߦ͖ͷϏʔϜΛަ‫ʹޓ‬ɺ͢ͳΘͪ 50 Hz ‫܁‬Γฦ͠Ͱӡస͞ΕΔ͜ͱͱͳΔɻϏʔϜ͕࣮ࡍʹՃ଎ɺԼྲྀʹ‫͞څڙ‬ΕΔ࣌ؒ
ΛϚΫϩύϧεͱ‫Ϳݺ‬ɻϚΫϩύϧε෯͸ϏʔϜௐ੔ͷࡍͷ 50 µs ͔Βར༻ӡస࣌ͷ 500 µs
·ͰมԽͤ͞ΔɻՃ଎ۭಎ΁ͷ RF ‫څڙ‬͸ϚΫϩύϧεΑΓ෯ͷ޿͍΋ͷͱͳΔɻ·ͨɺDTL(drift tube linac) ͷ Q ి࣓ੴ͸ɺ‫ࡏݱ‬ͷӡసͰ͸ DC ௨ి͞Ε͍ͯΔ͕ɺϏʔϜͷେ‫౓ڧ‬ԽʹΑΓΑΓ‫͍ڧ‬ऩଋྗɺ͢ͳΘͪྭ࣓ྔ͕ඞཁͱ
ͳͬͨ࣌ʹ͸ύϧε௨ి͞ΕΔɻ͜ͷ৔߹ɺ্ཱ͕ͪΓʹ͕͔͔࣌ؒΔͨΊɺϏʔϜՃ଎ΑΓ

10 ms ఔ౓ૣ͘τϦΨʔΛ༩͑Δඞཁ͕͋Δɻ
Linac ʹ͓͍ͯ΋ɺRCS ͔ΒͷϏʔϜͷߦ͖ઌ͕ MLF ͔ MR ͔ʹΑͬͯϚΫϩύϧε౳ͷϏʔϜͷ৚͕݅ҟͳΔͨΊʹɺλΠϛϯάγε
ςϜʹΑΔద੾ͳ؅ཧ͕ඞཁͰ͋ΔɻTEF ͷ‫ݐ‬ઃ‫ޙ‬͸͞Βʹߦ͖ઌɺͭ·ΓϏʔϜ৚͕݅૿͑
Δ͜ͱͱͳΔɻ

J-PARC Ͱ͸ɺλΠϛϯά৴߸ͷछྨͱͯ͠
ʮεέδϡʔϧυλΠϛϯάʯͱʮγϯΫϩφΠ
θʔγϣϯλΠϛϯάʯͷ 2 छྨΛఆ͍ٛͯ͠
Δ [2]ɻεέδϡʔϧυλΠϛϯά͸ɺՃ଎‫ث‬αΠΫϧͷதͰ͋Β͔͡ΊϓϩάϥϜ͞ΕͨλΠϛϯάͰτϦΨʔ΍ήʔτΛग़ྗ͢Δ΋ͷͰ͋ΔɻJ-PARC ͷ΄ͱΜͲͷ‫ثػ‬΍ి‫ݯ‬͸ɺ͜ͷεέδϡʔϧυλΠϛϯάʹ‫͍ͯͮج‬ಈ࡞͢Δɻ
γϯΫϩφΠθʔγϣϯλΠϛϯά͸ɺՃ଎‫͋ثػث‬Δ͍͸ి‫ʹݯ‬ΑΓੜ੒͞ΕΔτϦΨʔʹ‫͍ͨͮج‬λΠϛϯάͰ͋ΔɻओʹϏʔϜͱಉ‫͢ظ‬Δඞཁ͕͋Δ‫ثػ‬ͷಈ࡞ʹ༻͍ΒΕΔɻ

3.1 εέδϡʔϧυλΠϛϯάͷಈ࡞‫ݪ‬ཧલઅͰड़΂ͨΑ͏ʹɺJ-PARC ͷՃ଎‫ث‬ͷࡉ͔͍‫ج‬४͸ɺlinac ͷ‫܁‬Γฦ͠प‫͋Ͱظ‬ΔɻΑͬͯɺεέδϡʔϧυλΠϛϯάͰ͸ɺλΠϛϯά͸ J-PARC தԝ੍‫ޚ‬౩͔Βૹ৴͞ΕΔ‫ج‬४τϦΨʔ (25 Hz ·ͨ͸ 50 Hz) ͔ΒͷσΟϨΠͱͯ͠ఆٛ͞ΕΔɻ‫ج‬४τϦΨʔ͸ɺτϦΨʔΫҎ্͔ΒɺJ-PARC ͷಈ࡞λΠϛϯά͸ɺϩοΫͱ‫ݺ‬শ͞ΕΔ͜ͱ΋͋Δɻ• Ճ଎‫ث‬શମͷप‫ظ‬ΛܾΊΔͷ͸ MR ͷप‫ظ‬10－ 3

ਤ 4 ʹεέδϡʔϧυλΠϛϯάͷಈ࡞‫ݪ‬ཧSerial(TYPE)One MR cycl e

B

A

Typ e

50Hz Trigger clock

S

T1

T3

T2

........

Trig CLK

Delay 1A

Delay 1BS

T1........

........

........

ਤ 5: λΠϓྻͷ௕͞͸ MR प‫ͱظ‬౳͍͠ɻ

Receiver Module1
OutputDelay 2A

Tend

Delay 2B

Receiver Module2
Outputsynthesizer
Delay 3A

Receiver Module3
Output12MHz RFThe counter is not resetwith trigger clock when
Type B is received

master clock gen

Delay 4B
Receiver Module4
Output12MHz master clk

No output for Type A

ref trig gen

The delay value and control (no output etc.) are stored in LUT on the boardਤ 4: εέδϡʔϧυλΠϛϯάͷಈ࡞‫ݪ‬ཧɻtiming transmitter module
trig, clk, typeΛࣔ͢ [2]ɻ‫ج‬४τϦΨʔΛૹΔʹઌཱͪɺʮλfanoutΠϓʯͱ‫ݺ‬͹ΕΔ੍‫ޚ‬ϫʔυ͕ૹ৴͞ΕΔɻ
λΠϓ͸ɺ࣍ͷ‫ج‬४τϦΨʔ‫ޙ‬ͷՃ଎‫ث‬ͷӡసͷʮλΠϓʯΛදΘ੍͢‫ޚ‬ϫʔυͰ͋ΔɻՃ଎‫ࣨثػث‬ɾి‫ࣨݯ‬౳ʹஔ͔ΕͨλΠϛϯάड৴Ϟδϡʔϧ͸ɺ͜ΕΒ‫ج‬४τϦΨʔ͓Αͼ͓ΑͼλΠϓΛड৴͢Δɻ֤ड৴Ϟδϡʔϧ͸ͦ

E/O

E/O

E/O

trig, clk, type
(optical)to linac, RCS, MR
and experimental facilitiesΕͧΕϧοΫΞοϓςʔϒϧ (look up tableɺ

LUT) Λ࣋ͪɺλΠϓʹରԠ͢Δ LUT ͷ಺༰ਤ 6: தԝ੍‫ޚ‬౩ʹઃஔ͞ΕΔλΠϛϯάૹ৴ઃʹΑΓɺ࣍ͷप‫ظ‬ͷಈ࡞ΛҎԼͷΑ͏ʹܾఆ͢උͷ৴߸ͷྲྀΕɻ

ΔɻͦΕ͸ɺ

1. ઃఆ͞ΕͨσΟϨΠͰύϧεΛग़ྗ͢Δͷप‫ظ‬ɺ͢ͳΘͪ MR ͷप‫ͳͱظ‬Δɻ‫ࡏݱ‬͸ɺ

2. ࣍ͷप‫Ͱظ‬͸ύϧεΛग़ྗ͠ͳ͍
3. ‫ج‬४τϦΨʔΛड৴ͯ͠΋σΟϨΠΧ΢ϯ
λΛϦηοτͤͣʹɺ‫ج‬४τϦΨʔΛӽ͑ͯ਺͑ଓ͚ΔMR ͕ FX ϞʔυͰ 2.48 ඵप‫ظ‬ͷ࣌ʹ͸λΠϓྻͷ௕͞͸ 62ɺSX ϞʔυͰ 5.2 ඵप‫Ͱظ‬͸

130 Ͱ͋Δɻ
3.2 εέδϡʔϧυλΠϛϯάΛߏ੒͢Δϋʔ

ͷ 3 छྨͰ͋Δɻυ΢ΣΞ͜ͷํ๏ʹΑΓɺ‫ج‬४τϦΨʔ͝ͱʹҧͬͨதԝ੍‫ޚ‬౩ʹ͸ҎԼʹड़΂Δ૷ஔ͓ΑͼϞλΠϛϯά͓ΑͼϞʔυͰՃ଎‫ث‬ͷ‫͓ثػ‬Αͼδϡʔϧ͕ஔ͔ΕΔ (ਤ 6)ɻ·ͣɺߴਫ਼౓γి‫ݯ‬Λӡస͢Δ͜ͱ͕Ͱ͖Δɻ

ϯηαΠβ͓ΑͼΫϩοΫδΣωϨʔλʔʹλΠϓΛૹΔॱ൪ΛʮλΠϓྻʯͱ‫Ϳݺ‬ɻλΠΑΓ 12 MHz ͷϚελʔΫϩοΫ͕ੜ੒͞Εϓྻͷ௕͞͸ɺਤ 5 ʹࣔ͢Α͏ʹɺՃ଎‫ث‬શମ

Δɻ25 Hz ·ͨ͸ 50 Hz ͷ‫ج‬४τϦΨʔ͸ɺ

10－ 4

OPT Cable
TRIG
PULSE OPTGATEFANOUT GEN
TRIG(optional) (optional) (optional)

TRIG
FANOUT

NIM
O/E

ReceiverModules

To power supply/ devices

To power supply / devices

THRU

VME

1

2

3

4

ਤ 8: λΠϛϯάૹ৴Ϟδϡʔϧ (ӈ) ͱड৴Ϟ

indicates "USER-OUTPUT". (Delayed-pulse / gate)δϡʔϧ (ࠨ)ɻ

{

is a set of (1) 12MHz clock(2) 50Hz trigger clock
cables:(3) timing-control (100Mbps serial)ਤ 7: λΠϛϯάड৴ઃඋɻ

12MHz
master clk

12MHz
master clk

ref trig

ref trig

type
memoryϚελʔΫϩοΫΛΧ΢ϯτ͢Δ‫ج‬४τϦΨʔ

typeδΣωϨʔλ͔Βग़ྗ͞ΕΔɻλΠϛϯάૹ৴SERDESϞδϡʔϧ͸ɺ‫ج‬४τϦΨʔʹઌཱͪλΠϓ৘

FPGAใΛૹ৴͢ΔɻλΠϓ͸γϦΞϧԽͯ͠ૹ৴͞

type(serial)

VME bus

ΕΔɻJ-PARC ֤ࢪઃ΁ͷ͜ΕΒ৴߸ͷ഑৴ͷͨΊʹɺϑΝϯφ΢τͱ E/O (ి‫ޫؾ‬ม‫ )׵‬Ϟ

ਤ 9: ૹ৴Ϟδϡʔϧͷ‫ػ‬ೳϒϩοΫਤɻδϡʔϧ͕࢖༻͞ΕΔɻ
͜ΕΒͷ৴߸͸தԝ͔ΒޫέʔϒϧΛ௨֤ͯ͡ࢪઃʹ഑ΒΕΔɻ֤ࢪઃͰ͸ɺඞཁʹԠ͡ͷνϟϯωϧΛඋ͑ɺ͜ΕΒ 8 νϟϯωϧͷग़O/EɺϑΝϯφ΢τɺE/O Λ૊Έ߹ΘͤͯϦྗ͸ɺτϦΨʔϑΝϯφ΢τ͓ΑͼήʔτϑΝϨʔεςʔγϣϯΛߏ੒͢Δ͜ͱ͕Ͱ͖Δɻ

ϯφ΢τͰɺՃ଎‫ثػث‬ͷཁ‫͢ٻ‬ΔిѹϨϕ͜ͷΑ͏ʹ৴߸഑৴‫ܥ‬͸ελʔঢ়ͷߏ੒ʹϧʹม‫͞׵‬ΕΔɻඞཁʹԠ͡ɺτϦΨʔύϧεͳ͓ͬͯΓɺશͯͷࢪઃͰ͸ಉ͡৴߸͓Αͼ৘δΣωϨʔλʹΑΓύϧε෯ͷมߋ͕ߦͳΘΕใ (ΫϩοΫɺ‫ج‬४τϦΨʔɺλΠϓ) Λड৴͢ΔɻޫτϦΨʔ͕ඞཁͳ‫ثػ‬ͷͨΊʹ͸ɺઐ༻Δ͜ͱʹͳΔɻͷ E/O Ϟδϡʔϧ͕༻͍ΒΕΔɻ

ਤ 7 ʹ֤ࢪઃɺి‫ࣨݯ‬౳ʹஔ͔ΕΔλΠϛϯ

3.3 λΠϛϯάૹ৴ɾड৴Ϟδϡʔϧάड৴ઃඋͷུ֓Λࣔͨ͠ɻ֤ి‫ࣨݯ‬౳Ͱɺ഑λΠϛϯάૹ৴ɺड৴ϞδϡʔϧͷࣸਅΛɺਤ৴͞Εͨ 3 छྨͷ৴߸͸ O/E ϞδϡʔϧʹΑ

8 ʹࣔ͢ɻ͜ΕΒ͸ VME Ϟδϡʔϧͱͯ͠ߏΓి‫ؾ‬৴߸ʹม‫͞׵‬ΕɺλΠϛϯάड৴Ϟδϡʔ੒͞Ε͍ͯΔɻϧʹಋ͔ΕΔɻਤ 9 ʹࣔͨ͠Α͏ʹɺૹ৴Ϟδϡʔϧ͸λΠड৴Ϟδϡʔϧ͸ɺ‫ݸ‬ผͷτϦΨʔΛੜ੒͢ϓྻΛ‫ه‬Ա͢ΔʮλΠϓϝϞϦʯΛ‫ج‬൘্ʹ࣋ͬ

ΔॏཁͳϞδϡʔϧͰ͋Γɺৄࡉ͸࣍અͰड़΂

͍ͯΔɻຖճͷτϦΨʔΫϩοΫʹઌཱͪɺλΔɻड৴Ϟδϡʔϧ͸ಠཱͳ LUT Λ࣋ͭ 8 ͭΠϓϝϞϦ͔ΒऔΓग़͞Εͨ 32 ϏοτͷλΠ

10－ 5

12MHzmaster clk

PLL
96MHz

ϨΠΧ΢ϯλΛελʔτͤ͞ɺσΟϨΠϫʔυʹԠͨ͡λΠϛϯάͰτϦΨʔύϧεΛग़ྗ͢

ch1-8

ref trig

96MHz
delay counterandcontrol logic

type(serial)SERDES

type

gate
gen

LUT

gate
out
(1-4)

ΔɻσΟϨΠ஋͸ 24 ϏοτͰɺσΟϨΠΧ΢
ϯλ͸ 96 MHz Ͱಈ࡞͢Δɻ96 MHz ͷ಺෦Ϋ

delayed
pulse
(1-8)

ϩοΫ͸ PLL ʹΑΓɺ12 MHz ͷϚελʔΫϩοΫ͔Βੜ੒͞ΕΔɻ ࠷େ໿ 170 ms ·ͰΧ΢ϯτ͢Δ͜ͱ͕Ͱ͖Δɻ

FPGA

LUT ͔ΒಡΈग़͞ΕͨσΟϨΠϫʔυதͷ੍

VME bus‫ޚ‬ϏοτʹΑΓɺ֤νϟϯωϧͷΧ΢ϯλ͸ɺҎਤ 10: ड৴Ϟδϡʔϧͷ‫ػ‬ೳϒϩοΫਤɻԼͷͲΕ͔ͷಈ࡞Λ͢Δɻ

1. ‫ج‬४τϦΨʔʹΑΓΧ΢ϯλΛϦηοτ͠ɺϓ͕ͻͱͭͣͭૹ৴͞ΕΔɻλΠϓྻͷ௕͞͸Χ΢ϯτΛ։࢝͢ΔɻσΟϨΠϫʔυதͷ࠷௕ 1024 ‫Ͱ·ݸ‬ͷൣғͰ೚ҙʹܾΊΔ͜ͱ͕ࢦఆͷσΟϨΠ஋ͰύϧεΛग़ྗ͢Δ

Ͱ͖ɺλΠϓྻͷऴΘΓ͸ΤϯυϫʔυʹΑͬ

2. ࣍ͷ‫ج‬४τϦΨʔ‫ޙ‬ͷप‫ظ‬͸ύϧεΛग़ྗ͠ͳ͍ͯࣔ͞ΕΔɻલड़ͷΑ͏ʹɺͻͱͭͷλΠϓྻ͸ɺ1 ճͷ MR αΠΫϧʹ૬౰͢ΔɻλΠϓͷ

3. τϦΨʔΫϩοΫΛड৴ͯ͠΋σΟϨΠΧ

MSB ͸ɺγϦΞϧ௨৴ͷ಺༰͕λΠϓͰͳ͘ಛ΢ϯλΛϦηοτͤͣʹΧ΢ϯτΛ‫ܧ‬ଓ͠ɺผͳ৘ใͰ͋Δ͜ͱΛදΘ͢ϏοτͰ͋Δɻྫ

ࢦఆͷσΟϨΠ஋ͰύϧεΛग़ྗ͢Δ

͑͹ɺਤ 5 ʹࣔ͞Ε͍ͯΔɺMR αΠΫϧͷ։࢝ΛදΘ͢ʮSʯͱ͍͏৘ใͰ͋Δɻλ Π ϓ ͸ʮmode1ʯ(7 Ϗ ο τ)ʮmode2ʯ
ʮmode3ʯʮmode4ʯ(֤ 8 Ϗοτ) ͷ 4 ͭͷηΫγϣϯʹ෼ׂ͞ΕΔɻड৴Ϟδϡʔϧ͸ઃఆʹΑΓɺͲͷηΫγϣϯΛड৴͢Δ͔ΛܾΊΔ͜ͱ͕Ͱ͖Δɻ‫ݱ‬ঢ়ɺmode1 ͸ 7 Ϗοτͷ੍໿
͕͋ΔͨΊʹ࢖͓ͬͯΒͣɺmode2 ͔Β mode4
Λ linacɺRCSɺMR ʹׂΓ౰͍ͯͯΔɻ
ਤ 10 ʹड৴ϞδϡʔϧͷϒϩοΫਤΛࣔ͢ɻ

3. ͷ‫ػ‬ೳ͸ɺMR ͷΑ͏ʹ‫ج‬४τϦΨʔִؒ40 ms ΑΓ΋௕͍प‫ظ‬ͷࢪઃͷλΠϛϯάΛ
ઃఆ͢ΔͨΊʹඞཁͳ‫ػ‬ೳͰ͋Δɻ·ͨɺ੍‫ޚ‬ϏοτͷઃఆʹΑΓ VME ΠϯλϥϓτΛൃੜ
ͤ͞Δ͜ͱ͕Ͱ͖Δɻ
ड৴Ϟδϡʔϧ͸Χεέʔυ઀ଓ͕Ͱ͖ΔΑ͏ʹೖྗ৴߸ͷεϧʔग़ྗΛඋ͍͑ͯΔɻͻͱͭͷड৴Ϟδϡʔϧ͸ಠཱͳ 8 νϟϯωϧͷΧ
΢ϯλΛ࣋ͭɻओͳग़ྗϙʔτΛҎԼʹࣔ͢ɻ• σΟϨΠυύϧεग़ྗ: ಠཱͳ 8 νϟϯωड৴Ϟδϡʔϧ͸‫ج‬൘্ʹ LUT Λ࣋ͪɺLUTϧɻ্ʹࣔͨ͠௨Γɻʹ͸ʮσΟϨΠϫʔυʯ(σΟϨΠ஋ͱ੍‫ޚ‬Ϗο• ήʔτग़ྗ: 4 νϟϯωϧɻσΟϨΠυύϧ

τ͔Β੒Δ) ͕‫ه‬Ա͞ΕΔɻLUT ͷ಺༰͸Ϙʔυ্ʹ‫͔ػࢉܭ‬Βμ΢ϯϩʔυ͞ΕΔɻड৴Ϟεग़ྗͷ͏ͪͷ 1 ͭʹΑΓηοτ͞Εɺผδϡʔϧ͸ɺλΠϓΛड৴͢ΔͱɺλΠϓʹରԠͳग़ྗʹΑΓϦηοτ͞ΕΔɻ

ͨ͠σΟϨΠϫʔυΛ LUT ͔ΒऔΓग़͢ɻλΠϓ͕ 8 ϏοτͰ͋Δ mode2 ͔Β mode4 Ͱ͸ɺLUT ͷΞυϨε΋ 8 Ϗοτɺͭ·Γ 256 ͷΞυϨε͕͋Δ͜ͱʹͳΔɻτϦΨʔΫϩοΫΛड৴͢Δͱɺड৴Ϟδϡʔϧ͸‫ج‬൘্ͷσΟσΟϨΠυύϧεग़ྗ͓Αͼήʔτग़ྗ͔Βͷ৴߸͸ɺυϥΠόʔϞδϡʔϧΛ௨͡ద੾ͳి
ѹϨϕϧʹม‫͞׵‬Εͨ͏͑Ͱ‫ثػ‬ɾి‫ʹݯ‬ಋ͔ΕΔɻ·ͨɺτϦΨʔͷ෯Λௐ੔͍ͨ࣌͠ʹ͸

10－ 6

chopped out by linac chopper

RF bucket

ਤ 11: ΩοΧʔ์ిτϦΨʔͷੜ੒ɻ

intermediate pulseਤ 12: νϣοϐϯάೖࣹͷ֓೦ਤɻRCS ͷ RFόέπͷ୺ʹདྷΔϏʔϜΛνϣούʔʹΑΓ͋Β͔͡Ίνϣοϓ্ͨ͠Ͱ RCS ʹೖࣹ͢ΔɻτϦΨʔύϧεδΣωϨʔλͰ෯Λ৳௕Ͱ͖Δɻ

Linac ͓Αͼ RCS ͷλΠϛϯά༻ VME γϟʔγʹ͸ɺϦϑϨΫςΟϒϝϞϦͱ‫ݺ‬͹ΕΔઐ༻ͷޫϦϯΫωοτϫʔΫΛ༻͍ͨߴ଎γΣΞʔυϝϞϦ͕౥ࡌ͞Ε͍ͯΔɻϦϑϨΫςΟ
ϒϝϞϦ͸ɺ25 Hz ͷ‫܁‬Γฦ͠Ͱಈ࡞͢ΔλΠϛϯάγεςϜͷ LUT Λߴ଎͔ͭಉ࣌ʹॻ͖‫׵‬
͑Δ͜ͱ͕Ͱ͖ΔΑ͏ʹ௥Ճ͞Εͨ΋ͷͰ͋Δɻ

MR ͸ ඵ୯Ґͷप‫ظ‬Λ࣋ͭͨΊɺLUT ͷઃఆ͸௨ৗͷωοτϫʔΫӽ͠ʹߦΘΕ͍ͯΔɻ͍ͣΕͷՃ଎‫͍͓ͯʹث‬΋ɺઃఆ͸ଞͷ J-PARC ੍‫ޚ‬γεςϜಉ༷ʹશͯ EPICS (Experimental

Physics and Industrial Control System [3]) ͷਤ 13: νϣούʔήʔτ৴߸ͷੜ੒ɻνϟϯωϧΞΫηεͰߦ͑ΔΑ͏ʹͳ͍ͬͯΔɻ

3.4 γϯΫϩφΠθʔγϣϯλΠϛϯά
ϏʔϜʹಉ‫ظ‬ΛऔΔඞཁ͕͋ΔλΠϛϯά͸ɺ์ిτϦΨʔ͸ɺRCS ͷ RF ిѹΛ࢘ΔϩʔϨ͋Β͔͡Ίεέδϡʔϧ͓ͯ͘͜͠ͱ͕Ͱ͖ͳ

ϕϧ RF (LLRF) ੍‫ޚ‬γεςϜʹΑΓੜ੒͞Ε͍ɻγϯΫϩφΠθʔγϣϯλΠϛϯά͸ɺϏʔ

Δɻ์ిτϦΨʔੜ੒ͷϒϩοΫਤΛਤ 11 ʹϜಉ‫ظ‬ͷͨΊʹՃ଎‫ث‬ͷ‫ࣗثػ‬਎ʹΑΓੜ੒ࣔ͢͞ɻεέδϡʔϧυλΠϛϯάγεςϜ͔ΒΕΔλΠϛϯάͰ͋Δɻ

ͷ MLF औΓग़͠ήʔτ͋Δ͍͸ MR LLRF ͔

J-PARC ʹ͓͍ͯ୅දతͳγϯΫϩφΠθʔΒૹΒΕΔόέπબ୒ήʔτͱपճप೾਺Ͱൃ

γϣϯλΠϛϯά͸ɺΩοΧʔͷ์ిτϦΨʔ

ੜ͢Δ LLRF ಺෦ͷήʔτͷ AND Λऔͬͨ΋ͱ linac ͷνϣούʔήʔτ৴߸ͷੜ੒Ͱ͋Δɻ

ͷΛτϦΨʔͱͯ͠ग़ྗ͢Δ࢓૊ΈͰ͋Δɻτ

RCS ͷऔΓग़͠ΩοΧʔͱ MR ͷೖࣹΩοϦΨʔ͸ɺRCS αΠΫϧதҰ౓͚ͩग़ྗ͞ΕΔ

Χʔͷ์ిτϦΨʔ͸ɺRCS ͷ࣮ࡍͷपճϏʔΑ͏ʹ࣮૷͞Ε͍ͯΔɻ͜ͷτϦΨʔ͸ޫม‫׵‬Ϝͱಉ‫͚ͳ͍ͯ͠ظ‬Ε͹ͳΒͳ͍ɻϏʔϜ͸͞ΕͯΩοΧʔి‫ૹ΁ۙ͘ݯ‬ΒΕɺϩʔΧϧͷRF ిѹʹಉ‫͍ͯ͠ظ‬ΔͷͰɺ͜ΕΒΩοΧʔͷσΟϨΠϞδϡʔϧͰλΠϛϯάΛඍௐ੔͞Εɺ10－ 7ΩοΧʔి‫΁ݯ‬ೖྗ͞ΕΔɻηαΠβʔͰੜ੒͞ΕΔ 12 MHz ͔Β࡞ΒΕ

RCS ೖࣹ࣌ͷॎํ޲ͷϏʔϜϩεΛආ͚Δͨ

Δ 25 Hz τϦΨʔΛ‫ج‬४ͱ͍ͯͯ͠ɺిྗΛΊʹɺ͋Β͔͡Ί linac ্ྲྀʹઃஔ͞Εͨνϣο‫͢څڙ‬Δ AC ϥΠϯͷ 50 Hz ͱ͸ඇಉ‫͋Ͱظ‬ύʔ [4] ʹΑΓϏʔϜΛ࣌ؒํ޲ʹνϣοϓ͠Δ͔ΒͰ͋Δɻड৴ϞδϡʔϧͷσΟϨΠΧ΢

ͯ RCS ͷ RF όέπͷ୺ʹϏʔϜ͕ೖࣹ͞Εϯλʔ͸ɺ‫͞څڙ‬ΕΔ 12 MHz ͔Βੜ੒͞ΕΔ

ͳ͍Α͏ʹ͢Δɺνϣοϐϯάೖࣹ (ਤ 12) ͕

96 MHz Λ༻͍ͯΧ΢ϯτΛߦ͏ɻλΠϓΛΞ

ߦΘΕΔɻνϣούʔʹΑΓ࣌ؒํ޲ʹνϣουϨεͱͨ͠ LUT ʹΑΓ͍Ζ͍Ζͳಈ࡞Λߦϓ͞ΕͨϏʔϜύϧεͷ͜ͱΛதؒύϧεͱ‫ݺ‬͏΋ͷͷɺຊ࣭తʹ͸࣮‫࢖Ͱࣨݧ‬ΘΕΔσΟϨ

Ϳɻνϣούʔͷಈ࡞ͷͨΊͷνϣούʔήʔΠϞδϡʔϧͱมΘΓ͸ͳ͍ɻτ৴߸΋·ͨɺRCS ͷ LLRF ੍‫ޚ‬γεςϜʹΑ

ҰํɺੈքͷՃ଎‫ث‬ͷେ൒͸ɺAC ϥΠϯಉ‫ظ‬Γੜ੒͞ΕΔɻਤ 13 ʹ৴߸ͷੜ੒ํ๏Λࣔ͢ɻͷλΠϛϯάΛ࣋ͭɻ͜ͷͨΊɺλΠϛϯάγ

νϣούʔήʔτ৴߸͸ɺLLRF ͷτϦΨʔ‫ޙ‬εςϜͷ։ൃʹ͓͍ͯ͸ɺAC ϥΠϯͷθϩΫ

start ͷ͕࣌ؒ‫͔ͯͬܦ‬Β duration ͚ͩͷ࣌ؒϩε‫ݕ‬ग़ख๏ɾճ࿏΍ɺAC ϥΠϯप೾਺ΛచഒήʔτΛൃੜͤ͞ΔϚΫϩతͳ࣌ؒߏ଄Λ࣋ͭɻͯ͠λΠϛϯάʹ༻͍ΔΫϩοΫΛੜ੒͢Δճ

1 όϯνೖࣹͷ৔߹͸ h = 1 ͷɺ2 όϯνೖࣹͷ࿏ͳͲ͕ॏཁͳཁૉͱ͞Ε͖ͯͨ [6, 7, 8]ɻ

৔߹͸ h = 2 ͷθϩΫϩε৴߸͔Βɺઃఆͨ͠

J-PARC ‫ݐ‬ઃ‫͋Ͱظ‬Δ 2003 ೥ͷ J-PARC

σΟϨΠͱ෯Λ࣋ͭήʔτ৴߸Λੜ੒͠ɺޫม

Accelerator Technical Advisory Committee‫ͯ͠׵‬νϣούʔి‫ૹ΁ݯ‬Δɻνϣούʔήʔ(Ճ଎‫ٕث‬ज़ࢾ໰ҕһձɺATAC) ͷϨϙʔττͷத৺͕θϩΫϩε৴߸͔Β Tc ͷ஗ΕͰ͋Ͱ͸ɺҎԼͷ‫ه‬ड़͕͋Δɻ

Δ৔߹ɺઃఆ͞ΕΔσΟϨΠ d ͸ɺॴ๬ͷ࣌ؒThe timing system consists of three෯ w ʹର͠

d = Tc −w
2separate distribution infrastructures (12(1)

MHz clock, 50 Hz Master Trigger andͷؔ܎Λ࣋ͭɻνϣούʔλΠϛϯά͸ RCS

Pulse Type). The machine is not syn-

ʹ͓͚Δॎํ޲ͷ෼෍ΛܾΊΔॏཁͳཁૉͰ

chronized with the AC line. Removal of͋Δɻ

this constraint greatly simplifies synchro-͜ͷ΄͔ɺlinac ͷ‫ج‬४ RF ෼഑γεςϜ [5]nization with neutron choppers; however΋޿ٛͷγϯΫϩφΠθʔγϣϯλΠϛϯάͱthe committee noted that most accelera-‫͑ݴ‬ΔͰ͋Ζ͏ɻ

tor projects find it necessary to operate ina “line-synched” mode. Thought should

4 ઃ‫ࢥܭ‬૝

be given to the possible impacts of notsynchronizing to the line.

J-PARC λΠϛϯάγεςϜͷߏ੒͸Ҏ্ʹड़΂ͨ௨ΓͰ͋Δɻͯ͞ɺͦͷഎ‫͋ʹޙ‬Δઃ‫ܭ‬ࢥ૝͸ͲͷΑ͏ͳ΋ͷͳͷͩΖ͏͔ɻՃ଎‫ث‬ͷઐ໳ՈͰߏ੒͞ΕΔ ATAC ͷϝϯόʔʹͱͬͯɺAC ϥΠϯඇಉ‫ظ‬ͷλΠϛϯά

4.1 ԿΛ‫ج‬४ʹ͢Δͷ͔ͷ࣮‫ݱ‬Մೳੑ͸ࣗ໌Ͱ͸ͳ͔ͬͨɻ͜͜Ͱ͸ɺ– AC ϥΠϯඇಉ‫ظ‬ͷλΠϛϯά

AC ϥΠϯඇಉ‫ظ‬ͷλΠϛϯάΛ࠾༻͢Δ͜ͱ

3 અͷλΠϛϯάγεςϜͷઆ໌ΛಡΜͰɺҙ֎ʹγϯϓϧͳߏ੒Ͱ͋Δͱ‫͡ײ‬ΔͰ͋Ζ

ͷϝϦοτͱɺ‫ݒ‬೦ɺͦͯͦ͠ͷղܾʹ͍ͭͯߟ͍͑ͯ͜͏ɻ

͏ɻͦͷཧ༝͸ɺJ-PARC ͷλΠϛϯά͸γϯ

10－ 8

ਤ 15: ϑΣϧϛνϣούʔͷ໛ࣜਤ [10]ɻ

ਤ 14: KEK-PS ʹ͓͚ΔɺAC ϥΠϯप೾਺มಈͷଌఆ݁ՌɻARC ࿍ͱ͸ɺKEK ॴ֎ͷమ޻ॴͷ࿍Ͱ͋ΔɻϑΣϧϛνϣούʔ͸ߴ͍ΤωϧΪʔ෼ղೳΛಘΔͨΊʹ 500 Hz ͔Β 1 KHzɺͭ·Γ 30000
͔Β 60000 RPM ͱ͍͏ඇৗʹߴ଎ͳճస਺Ͱ
ӡస͞ΕΔɻ֤εϦοτͷ։‫ؒ࣌ޱ‬͸ 1 µs ఔ౓Ͱ͋Γɺ1% ҎԼͷΤωϧΪʔ෼ղೳΛಘΔ

AC ϥΠϯͷप೾਺͸ 50 Hz ͱ͞Ε͍ͯΔ͕ɺ࣮͸प೾਺͸͔ͳΓେ͖͘มಈ͢ΔɻKEK ཅͨΊʹ͸ɺதੑࢠϏʔϜͱ։‫ޱ‬ͷ૬ରతͳ࣌ؒ
ͷͣΕ͸ɺ300 ns ఔ౓͔͠‫͞ڐ‬Εͳ͍ɻࢠγϯΫϩτϩϯ (KEK-PS) ͰͷଌఆΛਤ 14͜ΕΒͷதੑࢠνϣούʔ͸ߴ଎ճస͢Δۚ

ʹ͕ࣔͨ͠ɺ͜ͷଌఆͰ͸มಈ෯͸໿ ±0.1 Hzɺଐͷ෺ମͰ͋Δ͕ͨΊʹ‫׳‬ੑ͕େ͖͘ɺճసҐ±0.2% ʹ ‫ ٴ‬Μ Ͱ ͍ Δ ɻKEK-PS ͷ ৔ ߹ ʹ ͸૬Λૉૣ͘มԽͤ͞Δ͜ͱ͕೉͍͠ɻAC ϥΠ

KEK ॴ֎ͷమ޻ॴͷ࿍ͷӡసঢ়‫ʹگ‬ΑΓӨϯʹಉ‫ͨ͠ظ‬Ճ଎‫ث‬ͷप‫ظ‬มಈɺͭ·Γ RCS ͔‫ڹ‬Λड͚͍ͯͨ͜ͱ͕໌Β͔ʹͳ͓ͬͯΓɺ͜ΒͷϏʔϜऔΓग़͠λΠϛϯάͷมಈʹ௥ै͞ͷΑ͏ʹ AC ϥΠϯͷप೾਺͸ಉ͡ిྗ؅಺ͷ

ͤΔ͜ͱ͸ඇৗʹࠔ೉Ͱ͋Δɻෛՙঢ়‫ʹگ‬ΑΓେ͖͘Ө‫͞ڹ‬ΕΔɻ͜ͷมಈ͸ϥϯμϜͰ͋Δͱͱ΋ʹ଎͍΋ͷͰ͋Δɻ

J-PARC Ͱ͸ɺલड़ͷεέδϡʔϧυλΠϛϯάɺͭ·ΓγϯηαΠβʔͰੜ੒͞Εͨ

ͯ͞ɺMLF ͷதੑࢠϏʔϜϥΠϯͷதʹ͸ɺ

12 MHz ͔Βੜ੒͞Εͨ 25 Hz τϦΨʔʹ‫ͮج‬தੑࢠνϣούʔͱ‫ݺ‬͹ΕΔ‫͕ثػ‬ઃஔ͞Ε͍ͯͯ RCS ͱதੑࢠνϣούʔΛಈ࡞ͤ͞Δ͍͜Δ΋ͷ͕͋ΔɻT0 νϣούʔ [9] ͸ɺ120 kgͱʹΑΓɺप‫ظ‬ͷมಈΛഉ͠ɺνϣούʔ։‫ޱ‬΋ͷ࣭ྔΛ࣋ͭχοέϧΫϩϜ߹ۚͷϒϨʔυ෦ͱ RCS औΓग़͠ϏʔϜͷҐ૬ؔ܎ΛৗʹҰ͕࠷େ 100 Hz ΋ͷप೾਺Ͱճస͢Δ‫͋Ͱثػ‬ఆʹอͯΔΑ͏ʹͨ͠ɻΓɺཅࢠϏʔϜ͕தੑࢠλʔήοτʹೖࣹͨ͠ϑΣϧϛνϣούʔଆͷਫ਼౓͸ 80 ns ఔ౓ॠؒͷόοΫάϥ΢ϯυϊΠζΛଌఆ͔Βআ‫ڈ‬[10] ͕ୡ੒͞Ε͓ͯΓɺϏʔϜऔΓग़͠ͷδο

͢Δ໨తΛ࣋ͭɻ

λʔ͸‫ޙ‬ड़͢Δ͕ 2 ns ະຬͰ͋ΔɻAC ϥΠϑΣϧϛνϣούʔ [10, 11] ͸୯৭தੑࢠ

ϯඇಉ‫ظ‬ͷλΠϛϯάͷ࠾༻ʹΑΓɺཁ‫ٻ‬ͷͷੜ੒ʹ༻͍ΒΕΔɻϑΣϧϛνϣούʔ͸ɺ

300 ns Ҏ಺Λຬͨ͢͜ͱ͕ (͋Δҙຯɺ༰қʹ)

ਤ 15 ʹࣔ͢Α͏ͳεϦοτΛ࣋ͭΞϧϛ߹ۚՄೳͱͳ͍ͬͯΔɻ੡ͷճసମͰ͋ΓɺೖࣹதੑࢠϏʔϜͷ͏ͪಛ͜ͷΑ͏ʹɺதੑࢠνϣούʔͱͷಉ‫͍ͱظ‬ఆͷ଎౓ (ΤωϧΪʔ) Λ࣋ͭ΋ͷ͚ͩΛಁա͏‫ͳྗڧ‬ಈ‫ʹ͚෇ػ‬ΑΓɺJ-PARC ͸ AC ϥΠ

͢Δ͜ͱͰɺ୯৭தੑࢠΛඃଌఆ෺ʹ‫͢څڙ‬Δɻϯඇಉ‫ظ‬ͷλΠϛϯάΛ࠾༻ͨ͠ͷͰ͋Δɻ

10－ 9

AC power
AC linesynchedﬁxed
linac power
consumption

not line
synchednot ﬁxed(a) ৼ෯ɻ

ਤ 16: AC ϥΠϯͱՃ଎‫ث‬ύϧεͱͷؔ܎ɻACϥΠϯಉ‫ظ‬ͷ৔߹ʹ͸ AC ϥΠϯͱύϧεͷҐ૬ؔ܎͸ҰఆʹอͨΕΔ͕ɺඇಉ‫ظ‬ͷ৔߹ʹ͸Ґ૬͸͹Β͹ΒʹͳΔɻͦ΋ͦ΋ɺͳͥՃ଎‫͍͓ͯʹث‬͸ AC ϥΠϯಉ‫·޷͕ظ‬ΕΔͷͰ͋Ζ͏͔ɻAC ϥΠϯ͔ΒిྗΛύϧεతʹҾ͖ग़͢ɺlinac ͷ RF ిѹͷ҆ఆԽ͕ಉ‫ظ‬ͷୈҰͷ໨తͰ͋Δɻਤ 16 ʹࣔͨ͠Α͏ʹɺAC ϥΠϯͷిѹͱ linac ͷύϧεͷҐ૬ؔ܎͕ɺAC ϥΠϯप‫ͱظ‬Ճ଎‫ث‬प‫ظ‬ͷҧ͍ʹΑΔϏʔτʹΑͬͯαΠΫϧຖʹҟͳΔͱɺΫϥΠετϩϯʹ͔͔Δ DC (͋Δ͍͸ɺ(b) Ґ૬ɻ

ਤ 17: RF ϑΟʔυόοΫ OFF (੺) ͓ΑͼON (྘) ͷ৔߹ͷ DTL RF ύϧεͷৼ෯͓ΑͼҐ૬ɻύϧε) ిѹͷΘ͔ͣͳҧ͍ʹΑΓɺRF ిѹʹӨ‫ڹ‬Λ༩͑ΔՄೳੑ͕͋ΔͷͰ͋Δɻ
୹ύϧε (< 1 µs) ͷిࢠ linac ʹ͓͍͍ͯ [12]ɻਤ 17(a) ͔ΒɺαάͷӨ‫ʹڹ‬ΑΓύϧ͸ɺRF ύϧε಺ͰͷϑΟʔυόοΫʹΑͬͯε‫ޙ‬൒ʹ͔͚ͯ໿ 5% ৼ෯͕མ͍༷ͪͯ͘ࢠ͕

RF ిѹΛ੍‫͢ޚ‬Δ͜ͱ͕೉͍ͨ͠Ίɺ͜ͷΑΘ͔ΔɻҐ૬ͷมԽ΋ඇৗʹେ͖͘ɺਤ 17(b)͏ͳ AC ϥΠϯಉ‫ظ‬͸ඞਢͰ͋ΔɻҰํɺJ-

ʹࣔͨ͠Α͏ʹ 15 ౓ఔ౓΋มಈ͍ͯ͠Δɻͭ

PARC linac ͷ RF ύϧε͸ɺϑϥοττοϓ

·ΓɺϑΟʔυόοΫ OFF Ͱ͸ཁ‫༻࢖ٻ‬ͷৼ͕໿ 600 µs ͱ௕͍ɻ͜ͷΑ͏ͳ௕ύϧεͷ৔෯ 1%ɺҐ૬ 1 ౓Λຬͨ͢͜ͱ͕Ͱ͖͍ͯͳ͍ɻ

߹ɺRF ిѹ͸ύϧε಺ͰϑΟʔυόοΫʹΑ

ϑΟʔυόοΫΛด͡Δ͜ͱͰɺৼ෯ɺҐ૬ͰΓ҆ఆԽͤ͞Δ͜ͱ͕Ͱ͖ΔɻϑΟʔυόοΫͦΕͧΕ ±0.15%ɺ±0.15 ౓ʹมಈΛ཈੍Ͱ͖OFFɺON ͷ৔߹ͷ DTL ͷ RF ύϧεͷৼ෯Δɻύϧε಺มಈ͚ͩͰͳ͘ɺαΠΫϧຖͷมͱҐ૬Λϓϩοτͨ͠΋ͷΛɺਤ 17 ʹࣔ͢ɻಈ͓Αͼ௕‫ظ‬ͷυϦϑτ΋ಉఔ౓ʹ཈੍͞ΕͯϑΟʔυόοΫ OFF ͷ৔߹Ͱ͸ɺAC ϥΠϯඇ͍Δ [12]ɻ

ಉ‫ʹظ‬ΑΔϦοϓϧͷӨ‫ڹ‬ΑΓ΋໿ 3.4% ʹ͓͜ͷΑ͏ʹɺ௕ύϧεͰ͋Δ J-PARC linacΑͿΧιʔυిѹͷαάͷӨ‫͕ڹ‬͸Δ͔ʹେ͖ʹ͓͍ͯ͸‫ ͳྗڧ‬RF ϑΟʔυόοΫʹΑͬͯ

10－ 10RF ిѹͷ҆ఆԽ͕ߦΘΕ͓ͯΓɺAC ϥΠϯඇಉ‫͋Ͱظ‬Δ͜ͱʹΑΔӨ‫ڹ‬͸΄ͱΜͲͳ͍ͱ




π

−π





‫ͯͬݴ‬Α͍ɻ‫ݱ‬ঢ়Ͱ linac ͷΤωϧΪʔมಈ͸

0.01% ఔ౓Ͱ͋ΓɺRCS ΁ͷೖࣹͱͯ͠͸े෼
πͳ҆ఆ౓Ͱ͋Δɻ−πγϯΫϩτϩϯ (RCSɺMR) ͷి‫ݯ‬͸Ͳ͏


͔ɻҰൠʹɺαΠϦελΛ࢖࣓ͬͨੴి‫ݯ‬͸ɺ


AC ϥΠϯಉ‫ظ‬ͷ΄͏͕҆ఆͰ͋Δͱ͞Ε͍ͯ






ΔɻJ-PARC ͷి࣓ੴి‫ݯ‬͸εΠονϯάి‫ݯ‬Ͱ͋ΓɺAC ϥΠϯͷӨ‫ڹ‬͸গͳ͍ɻਤ 18: DDS ʹΑΔ RF ੜ੒ͷ֓೦ਤɻϏʔϜϞχλʔγεςϜ΁ͷ AC ϥΠϯͷӨ‫ڹ‬͸ɺέʔϒϧ഑ઢʹ͓͍ͯɺΞΠιϨʔγϣϯɺ઀஍ɺγʔϧυͷͦΕͧΕ͕ద੾ʹߦΘΕ͍ͯͳ͍৔߹ʹ͸ɺόοΫάϥ΢ϯυͷϊΠζ
ͱͯ͠ແࢹͰ͖ͳ͍΋ͷʹͳΔɻAC ϥΠϯ͔ΒͷϊΠζͷࠞೖ͕͋ͬͨ৔߹ʹͦΕΛഉআ͢
Δ͜ͱ͕Ͱ͖ΔͨΊʹɺϏʔϜϞχλʔʹͱͬͯ΋ AC ϥΠϯಉ‫ظ‬͸޷·͍͠΋ͷͱ͞Ε͍ͯ
Δɻ޾͍ J-PARC Ͱ͸஫ҙਂ͘έʔϒϧ഑ઢ͕ͳ͞Ε͓ͯΓɺ‫ࡏݱ‬ͷͱ͜Ζ AC ϥΠϯͷࠞೖ͕໰୊ͱͳͬͨ͜ͱ͸ͳ͍ɻ͜ͷΑ͏ͳৄࡉ‫ݕ‬౼ͷ΋ͱͰɺAC ϥΠϯඇಉ‫ظ‬ͷλΠϛϯά͕࣮‫͞ݱ‬Εͨɻཌ 2004 ೥ͷ

ATAC Ͱ͸ɺ‫ظ‬ͷλΠϛϯάΛ༻͍͍ͯΔɻ͜͜Ͱ͸จ‫[ ݙ‬8]
Λ঺հ͢ΔʹཹΊΔ͕ɺSNS ͷλΠϛϯάγε
ςϜ͸ɺAC ϥΠϯಉ‫ظ‬Λ࣮‫͢ݱ‬ΔͨΊʹɺACϥΠϯͷθϩΫϩε‫ݕ‬ग़प‫ظ‬มԽͷ৘ใΛΠϕϯτͰૹ৴͢Δඞཁ͕͋ΔͳͲඇৗʹෳࡶͳλΠϛϯάγεςϜͱͳ͍ͬͯΔɻ

4.2 ϚελʔΫϩοΫͷॏཁੑ
3 અͰड़΂ͨ 12 MHz ͷϚελʔΫϩοΫ͸ɺλΠϛϯάड৴ϞδϡʔϧͰͷ 96 MHz ಺෦ΫϩοΫͷੜ੒ʹ࢖༻͞ΕΔ͚ͩͰͳ͘ɺՃ
଎‫ثػث‬ɺి‫ݯ‬ͷΫϩοΫͱͯ͠࢖ΘΕ͍ͯΔɻྫΛ‫͛ڍ‬Ε͹ɺ෼पͨ͠΋ͷ͸ి࣓ੴͷύλʔThe question of synchronization to theϯͷαϯϓϦϯάΫϩοΫͱͯ͠࢖ΘΕΔ΄͔ɺ

AC line has been fully examined as rec-γϯΫϩτϩϯ (RCSɺMR) ͷϩʔϨϕϧ RFommended by the ATAC previously. The(LLRF) ੍‫ޚ‬γεςϜͰ͸ 36 MHz ʹచഒ͠decision has been taken to stick to the cur-ͨ΋ͷ͕γεςϜͷΫϩοΫͱͯ͠༻͍ΒΕͯ

rent plan.

͍ΔɻͱɺAC ϥΠϯඇಉ‫ظ‬ͷλΠϛϯάʹ͍ͭͯ

ATAC ҕһ΋ೲಘ͢Δͱ͜Ζͱͳͬͨɻ
ϏʔϜίϛογϣχϯά։͔࢝Β‫ࢸʹࡏݱ‬Δ·Ͱͷӡ༻ͰɺAC ϥΠϯඇಉ‫ظ‬ͷλΠϛϯά
Ͱ͋Δ͕ͨΊͷ໰୊͸ੜ͍ͯ͡ͳ͍ɻ

J-PARC ͷλΠϛϯάγεςϜͷߏ੒͕γϯϓϧʹͳͬͨ͜ͱ͸෭࢈෺Ͱ͋Δɻಉ༷ʹதੑࢠνϣούʔΛ࣋ͭ SNS Ͱ͸ɺAC ϥΠϯಉཅࢠγϯΫϩτϩϯͰ͸ɺཅࢠͷ଎౓มԽʹରԠͯ͠ RF प೾਺͕มԽ͢ΔɻRCS Ͱ͸ɺՃ଎ϋʔϞχοΫ (h = 2) ͷप೾਺͸ೖࣹΤωϧΪʔ 400 MeV Ͱͷ 1.23 MHz ͔ΒऔΓग़͠ΤωϧΪʔ 3 GeV Ͱͷ 1.67 MHz ·ͰεΠʔϓ͢Δɻप೾਺มԽ͢Δ RF Λੜ੒͢ΔͨΊʹɺ

LLRF ੍‫ޚ‬γεςϜͰ͸ DDS (direct digitalsysthesis) ٕज़Λ༻͍͍ͯΔɻ

10－ 11

DDS ʹΑΔ RF ੜ੒ͷ֓೦ਤΛਤ 18 ʹࣔ͢ɻप೾਺ύλʔϯ͔ΒಡΈग़͞ΕΔप೾਺৴߸ɺͭ
·ΓΫϩοΫຖͷҐ૬ՃࢉྔΛ࢖͍ɺҐ૬Ճࢉ‫ث‬ʹΑΓपճप೾਺ͷ‫ڒ‬೾ঢ়ͷҐ૬৴߸ (h = 1ɺ−π ͔Β π ·Ͱ) ͕ੜ੒͞ΕΔɻप೾਺৴߸ͷ


−






Ϗοτ෯͸ 32 ϏοτͰ͋Δɻ͜ΕΛ 2 ഒ͢Δ͜ͱͰɺՃ଎ϋʔϞχοΫ (h = 2) ͷҐ૬৴߸͕ಘ


ΒΕɺҐ૬ύλʔϯ͓ΑͼҐ૬ϑΟʔυόοΫ৴−

+ਤ 19: Ґ૬ϑΟʔυόοΫͷϒϩοΫਤɻ߸͕Ճࢉ͞Εͨ΋ͷ͕ coordinate transformerͷೖྗͱͳΔɻCoordinate transformer ͷग़

10(rf output) = r cos θ(2)Ͱ͋Δɻ͜͜ʹɺθ ͸ೖྗ͞ΕͨҐ૬৴߸ɺr ͸ిѹ੍‫ޚ‬ϧʔϓʹΑΓ੍‫͞ޚ‬Εͨৼ෯Ͱ͋ΔɻRF ೾‫ܗ‬͸ DAC ʹΑΓΞφϩά৴߸ʹม‫͞׵‬delta-R position [mm]ྗ͸ɺwithout FB
with FB50-5ΕΔɻγεςϜʹೖྗ͞ΕΔ LLRF τϦΨʔຖ-10ʹɺҐ૬Ճࢉ‫ث‬͸ 0 ʹϦηοτ͞ΕɺαΠΫϧ

0

5

10

15

20

time from Bmin [ms]ຖͷҐ૬ͷ࠶‫ݱ‬ੑΛอূ͍ͯ͠Δɻ

DDS ʹΑΔ RF ੜ੒͸ɺप೾਺ͷਫ਼౓͕ߴ͘ɺ10−7 ఔ౓͕࣮‫ݱ‬ՄೳͰ͋ΔɻΞφϩάͷ

ਤ 20: Ґ૬ϑΟʔυόοΫͳ͠ɺ͋Γͷ৔߹ͷ‫ي‬ಓͷͣΕɻ

VCO (voltage controlled oscilator) Ͱ͸ 10−4ఔ౓Ͱ͋ΓɺVCO Λ༻͍ͨ Ξφϩά LLRF ੍‫ޚ‬γεςϜΛඋ͑ͨγϯΫϩτϩϯͰ͸ɺϏʔϜ‫ي‬ಓΛภ޲ి࣓ੴͷத৺ʹ௨ͨ͢Ίʹɺ‫ي‬ಓϑΟʔυόοΫͱ‫ݺ‬͹ΕΔϏʔϜϑΟʔυόοΫ͕ඞਢͱͳΔɻ‫ي‬ಓϑΟʔυόοΫ͸ɺσΟεύʔδϣϯ͕େ͖͍৔ॴʹஔ͔Εͨ BPM ͷҐஔ৴߸͔ΒɺσΟεύʔδϣϯΛ༻͍ͯӡಈྔͷͣΕ dp/p Λࢉग़͠ɺ

df
dp
=η
f
p

ภ޲ి࣓ੴͷ࠶‫ݱ‬ੑ͕ඇৗʹߴ͍ͨΊʹՄೳͱͳͬͨ͜ͱͰ͋ΔɻඞཁʹԠ͡ɺೖࣹ͔ΒऔΓग़͠·Ͱͷ‫ي‬ಓΛ‫ه‬࿥͠ɺͦΕΛ༻͍ͯप೾਺
ύλʔϯΛิਖ਼ͯ͠΍Δ͜ͱͰɺ‫ي‬ಓΛภ޲ి࣓ੴͷத৺ʹิਖ਼͢Δ͜ͱ͕Ͱ͖ɺͦͷ‫ޙ‬͸௕‫ʹؒظ‬ΘͨΓ࠶ิਖ਼ͷඞཁ͸ͳ͍ [13]ɻ
͜ͷΑ͏ʹɺJ-PARC ϚελʔΫϩοΫΛ‫ج‬
४ͱ͠ɺDDS Λ༻͍Δ͜ͱͰɺऔΓग़࣌͠ͷ

(3)

RF ೾‫ܗ‬ͷҐ૬ɺͭ·ΓऔΓग़͠ϏʔϜҐ૬ͷ࠶‫ݱ‬ੑΛ֬อ͢Δ͜ͱ͕Ͱ͖Δ [14]ɻ

ͷؔ܎ʹ‫͍ͯج‬प೾਺ʹมௐΛ͔͚Δ΋ͷͰ͔͋͠͠ͳ͕Βɺେ‫౓ڧ‬ϏʔϜΛՃ଎͢ΔͨΊʹΔɻ‫ي‬ಓϑΟʔυόοΫΛ༻͍Δͱɺ͜ͷप೾͸ɺॎํ޲ͷμΠϙʔϧৼಈΛ཈͑ΔͨΊʹɺҐ਺มௐͷͨΊʹ RF ೾‫ܗ‬ɺҐ૬͸αΠΫϧຖ૬ϑΟʔυόοΫͱ‫ݺ‬͹ΕΔผͷϏʔϜϑΟʔͷ࠶‫ݱ‬ੑ͕อূ͞Εͳ͍΋ͷͱͳΔɻJ-PARC

υόοΫ͕ඞཁͱͳΔɻҐ૬ϑΟʔυόοΫ͸ɺͷγϯΫϩτϩϯͰ͸ɺ‫ي‬ಓϑΟʔυόοΫ͸

ਤ 19 ʹࣔ͢Α͏ʹϏʔϜͷ‫ݕ‬೾Ґ૬ͱۭ಑ͷ

LLRF ͷҰ෦ͱ࣮ͯ͠૷͞Ε͍ͯΔ͕࢖༻͞Ε‫ݕ‬೾Ґ૬Λൺֱ͢ΔɻAC ݁߹ʹΑΓৼಈ੒෼͍ͯͳ͍ɻ͜Ε͸ DDS ͷ RF प೾਺͓ΑͼͷΈΛऔΓग़ͨ͠‫ޙ‬ɺPI ੍‫͓ޚ‬Αͼશମͷϧʔ

10－ 12


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


   


 













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







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
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

ਤ 22: RCS BPM#5 ͷ৔ॴͰͷ COD ͷ࣌ؒਤ 21: ద༻ͨ͠ϧʔϓήΠϯύλʔϯͱɺ100γϣοτͷۭ಑‫ݕ‬೾Ґ૬ͷ͹Β͖ͭɻมԽɻࠇ: ೖࣹ‫ ޙ‬1 ms Ͱͷσʔλɺ੨: 5 msɺ
੺: 10 msɻϓήΠϯύλʔϯΛద༻͠ɺۭ಑ʹҐ૬มௐΛγϣοτͷۭ಑ͷ‫ݕ‬೾Ґ૬ΛॏͶͯϓϩοτ͠༩͑Δ΋ͷͰ͋ΔɻҐ૬ϑΟʔυόοΫͳ͠ɺͨ΋ͷΛਤ 21 ͷԼ෦ʹࣔͨ͠ɻ͜ͷଌఆͰ͸͋Γͷ৔߹ͷσΟεύʔδϣϯͷେ͖͍৔ॴͰ

ϏʔϜύϫʔ͸ 300 kW Ͱ͋ΔɻϧʔϓήΠϯͷ‫ي‬ಓͷͣΕͷൺֱΛɺਤ 20 ʹࣔ͢ɻେ͖ͳμ͕࠷େͰ͋Δ 10 ms ෇ۙ·Ͱ͸ɺҐ૬ϑΟʔυΠϙʔϧৼಈ͕ɺҐ૬ϑΟʔυόοΫʹΑΓ‫ڧ‬όοΫͷӨ‫ʹڹ‬ΑΓύϧεຖͷҐ૬ͷ͹Β͖ͭྗʹ཈੍͞Ε͍ͯΔ͜ͱ͕Θ͔ΔͩΖ͏ɻ͔͠͸ 10 ౓Ҏ্Ͱ͋Δɻ͜ͷ࣌·ͰʹμΠϙʔϧৼ͠ͳ͕ΒɺҐ૬ϑΟʔυόοΫ͸Ґ૬ʹมௐΛಈ͸΄΅཈੍͞Ε͍ͯΔɻͦͷ‫ޙ‬ɺऔΓग़͠ʹ͔͚ΔͨΊɺ΍͸ΓऔΓग़͠ϏʔϜͷҐ૬ʹӨ͔͚ͯͷήΠϯύλʔϯͷ‫ݮ‬গʹΑͬͯ͸৽ͨ‫ڹ‬Λ༩͑ɺ࠶‫ݱ‬ੑ͕อূ͞Εͳ͍΋ͷͱͳͬͯͳৼಈͷ૿େ͸ੜ͍ͯ͡ͳ͍ɻήΠϯύλʔϯ͠·͏ɻ

͕ 0 Ͱ͋ΔऔΓग़࣌͠ʹ͸ɺҐ૬ͷ͹Β͖ͭ͸͜ͷ໰୊ʹରॲ͢ΔͨΊʹ͸ɺҐ૬ϑΟʔυ

1 ౓Ҏ಺ͱͳ͍ͬͯΔɻRF प೾਺͸ 1.67 MHzόοΫͷϧʔϓήΠϯύλʔϯΛద੾ʹઃఆ͠

Ͱ͋Δ͔Βɺ࣌ؒʹ‫͢ࢉ׵‬Δͱશ෯Ͱ 1.7 nsͯ΍Ε͹Α͍ɻμΠϙʔϧৼಈ͕ੜ͡Δ‫ݪ‬Ҽ͸ɺҎ಺ͷ௿δολʔͱ͍͏͜ͱʹͳΔ [15]ɻMLF

ॎํ޲ϖΠϯςΟϯάͷͨΊͷप೾਺Φϑηοͷதੑࢠνϣούʔͷཁ‫ٻ‬Λे෼ʹຬ͚ͨͩ͢

τ΍ॳ‫ظ‬ͷϛεϚονʹΑΔ΋ͷͰɺՃ଎ͷલ

Ͱͳ͘ɺMR ͷόέπத৺΁ͷਖ਼֬ͳೖࣹʹ͓൒ʹूத͍ͯ͠Δɻ͜ͷͨΊɺਤ 21 ʹࣔ͢Α͏͍ͯɺ͜ͷඇৗʹ௿͍δολʔੑೳ͸ෆՄܽͰʹɺՃ଎த൫ 10.2 ms ·Ͱ͸ήΠϯΛ࠷େͱ͠ɺ

͋Δɻ

͔ͦ͜ΒऔΓग़͠ʹ͔͚ͯΏͬ͘Γͱϧʔϓή͜ͷΑ͏ʹɺ4.1 અͰड़΂ͨ AC ϥΠϯඇಉΠϯΛམͱ͍ͯ͘͠ɻऔΓग़͠௚લͷ 19.2 ms‫ظ‬ͷλΠϛϯά͓Αͼ͜ͷઅͰड़΂ͨ 12 MHzͰ͸ɺήΠϯ͕ 0 ͱͳΔΑ͏ʹઃఆ͢Δɻલड़

ͷϚελʔΫϩοΫͷ෼഑ʹΑͬͯɺJ-PARCͷΑ͏ʹ J-PARC ͷҐ૬ϑΟʔυόοΫ͸ۭ಑ͷՃ଎‫ث‬͸αΠΫϧຖͷ͹Β͖ͭͷ΄ͱΜͲͳͷҐ૬ʹมௐΛ͔͚Δ΋ͷͰ͋ΓɺήΠϯ͕ 0͍Ճ଎‫͍ͯͬͳͱث‬Δɻ

ͷ৔߹͸ϓϩάϥϜ௨Γͷۭ಑Ґ૬ͱͳΔͨΊɺͰ͸ɺਤ 22 ͸ͲͷΑ͏ʹઆ໌͢Ε͹Α͍͔ɻϏʔϜऔΓग़͠Ґ૬ͷ࠶‫ݱ‬ੑ͕อূ͞ΕΔɻ࣮ਤ 22 ͸ɺRCS ͷ BPM#5 ͷ COD (closedࡍʹϧʔϓήΠϯύλʔϯΛద༻ͨ࣌͠ͷ 200

orbit distortion) ଌఆ݁Ռͷ࣌ؒมԽΛϓϩο

10－ 13ਤ 23: ೖࣹ‫ ޙ‬1 ms Ͱͷશपͷ CODɻ্: ଌఆ
։࢝ 60 ඵɺத: 108 ඵɺԼ: 156 ඵɻτͨ͠΋ͷͰ͋Δɻਤதɺࠇઢ͸ೖࣹ‫ ޙ‬1 ms ͷσʔλΛ௕࣌ؒ෼ϓϩοτͨ͠΋ͷͰ͋Γɺ੨ઢɺ੺ઢ͸ͦΕͧΕೖࣹ‫ ޙ‬5 msɺ10 ms ͷ΋ͷͰ͋ΔɻαΠΫϧຖͷ͹Β͖ͭͷͳ͍͸ͣͷਤ 24: ิਖ਼લ (੨) ͱิਖ਼‫ )੺( ޙ‬ͷ CODɻ্

RCS Ͱ͋Δ͕ɺ໿ 192 ඵͷप‫ظ‬Λ΋ͬͯ COD

ΑΓɺBPM#1ɺ#5ɺ#13ɺ#29ɻ

͕มԽ͓ͯ͠Γɺ·ͨͦΕ͸ೖࣹ௚‫( ޙ‬1 ms) Ͱ࠷΋େ͖ͳ෯Λ࣋ͪɺՃ଎ͱͱ΋ʹ෯͸খ͘͞άʹ͸ 12 MHz ͷϚελʔΫϩοΫΛ෼प͠

ͳ͍ͬͯΔ͜ͱ͕Θ͔Δɻ

COD ͸ɺBPM#5 ͷ৔ॴ͚ͩͰͳ͘ɺRCSͨ΋ͷΛ࢖༻͍͕ͯͨ͠ɺεΠονϯάͷλΠ

ͷϦϯάશपʹΘͨͬͯൃੜ͍ͯ͠Δɻਤ 23ϛϯάͦͷ΋ͷʹ͸ɺ੍‫ޚ‬൫಺ͷಠཱͳൃৼ‫ث‬͸ɺਤ 22 ͷ఺ઢͷ৔ॴ (60 ඵɺ108 ඵɺ156 ඵ)Λ࢖༻͍ͯͨ͠ɻ͜ͷͨΊɺਖ਼֬ͳՃ଎‫ث‬प‫ظ‬Ͱͷೖࣹ‫ ޙ‬1 ms ͷશपͷ COD Λϓϩοτ͠

25 Hz ͱ੍‫ޚ‬൫಺ͷΦγϨʔλͷप೾਺͸‫׬‬ͨ΋ͷͰ͋Δɻ60 ඵͱ 156 ඵͰ͸Ґ૬͕‫͋Ͱٯ‬શͳ੔਺ഒͱͳ͓ͬͯΒͣɺ͜ͷϏʔςΟϯάΓɺ·ͨ 108 ඵͰ͸ COD ͕খ͘͞ͳ͍ͬͯΔɻʹΑΓ COD ͕௕͔͚࣌ؒͯมಈ͍ͯͨ͠ͷͰ͜ͷΑ͏ͳ COD มಈ͕͋Δͱɺߴਫ਼౓ͷ͋ΔɻϏʔϜௐ੔Λߦ͏ͨΊʹ͸มಈͷप‫( ظ‬192 ඵ)ภ޲ి࣓ੴి‫ݯ‬͸ͦͷ‫ޙ‬վम͕ߦΘΕɺϦοͷ COD Λଌఆɺฏ‫ۉ‬Խͯ͠ղੳ΍γϛϡϨʔϓϧࣗମͷ௿‫ݮ‬͸Ͱ͖ͳ͔͕ͬͨɺεΠονϯ

γϣϯʹ༻͍ͳ͚Ε͹ͳΒͣɺඇৗʹඇޮ཰ͰάͷλΠϛϯάੜ੒ʹλΠϛϯάγεςϜ͔Β͋ͬͨɻͷ 12 MHz ϚελʔΫϩοΫΛར༻͢ΔΑ͏ʹ࣮͸͜ͷ COD ͸ɺภ޲ి࣓ੴి‫ݯ‬ͷεΠοͳͬͨɻ͜ͷ͜ͱͰɺϦοϓϧʹΑΔ COD ͸νϯάʹΑΔ࣓৔Ϧοϓϧ͕‫ݪ‬ҼͰ͋ͬͨ [16]ɻ࠶‫ݱ‬ੑͷߴ͍΋ͷͱͳΓɺ͜ΕΛεςΞϦϯά

−5

T ఔ౓ͱখ͍͞΋ͷͰ͋Δ͕ɺి࣓ੴΛߴ଎ (1 KHz) Ͱྭ࣓ͯ͠ิਖ਼͢Δ͜ͱೖࣹ࣌ͷภ޲࣓৔ͷ 0.07% ʹ૬౰͢ΔɻεΠο͕Մೳͱͳͬͨɻਤ 24 ʹิਖ਼લ‫ޙ‬ͷೖࣹ͔ΒνϯάʹΑΔϦοϓϧͷେ͖͞͸Ճ଎αΠΫϧऔΓग़͠ʹ͔͚ͯͷ COD Λϓϩοτͨ͠ɻಛதมΘΒͳ͍ͨΊɺՃ଎ͱͱ΋ʹภ޲࣓৔͕‫ڧ‬ʹ COD ͕େ͖ͳ BPM ͷ৔ॴΛબΜͰ͋Δɻ

͘ͳΔͱɺϦοϓϧͷӨ‫ڹ‬͸খ͘͞ͳΓɺCOD͍ͣΕͷ৔߹΋ɺ࠷େ 3 mm ఔ౓ͷ COD ͕Α΋ਤ 22 ͷΑ͏ʹ‫ݮ‬গ͢ΔͷͰ͋Δɻ

͘ิਖ਼Ͱ͖͍ͯΔɻϦοϓϧͷӨ‫ڹ‬͸Θ͔ͣʹϦοϓϧ͸ 10ภ޲ి࣓ੴి‫Ͱݯ‬͸ɺύλʔϯͷαϯϓϦϯ࢒͍ͬͯΔ΋ͷͷɺมಈ͠ͳ͘ͳͬͨ͜ͱͰγ

10－ 14ϯάϧγϣοτͰͷଌఆ͔ΒղੳΛߦ͏͜ͱ͕
Ͱ͖ΔΑ͏ʹͳΓɺޮ཰తʹϏʔϜௐ੔ΛਐΊ
Δ͜ͱ͕Ͱ͖ΔΑ͏ʹͳͬͨɻಛʹՃ଎લ൒Ͱ
͸ίϦϝʔλ෇ۙͰͷ COD ͸ϏʔϜϩεʹେ͖ͳӨ‫ڹ‬Λ‫ͨ͢΅ٴ‬Ίɺ͜ͷΑ͏ͳߴ଎ͷ CODิਖ਼͸ɺ500 kW Ҏ্ͷେ‫౓ڧ‬ϏʔϜӡసʹ͸ඞਢͱͳ͍ͬͯΔɻ
·ͨɺपճϏʔϜͷ COD ͕प‫ظ‬తʹมಈ͠
͍ͯΔͱೖࣹϏʔϜ‫ي‬ಓͱͷͣΕ͕ൃੜ͠ɺೖ
ࣹϖΠϯςΟϯάͷൣғ͕࣮࣭తʹมಈͯ͠͠
·͏͜ͱͰɺೖࣹ‫ޙ‬ͷ஝ੵϏʔϜαΠζʹมಈ͕ੜ͍ͯͨ͡ɻ͜Ε͕ิਖ਼͞Εͨ͜ͱͰɺߴਫ਼
ਤ 25: ಉ‫ظ‬σʔλͷ֓೦ɻ౓ͷϏʔϜαΠζௐ੔͕ՄೳͱͳͬͨɻMR ೖࣹʹ͓͍ͯ͸औΓग़͠ϏʔϜαΠζΛਫ਼ີʹௐ੔͢Δඞཁ͕͋Γɺ͜ͷ఺͔Β΋प‫ظ‬มಈΛ཈੍ͨ͜͠ͱ͸ॏཁͳҙຯΛ࣋ͭɻ͜ͷ͜ͱ͔ΒಘΒΕΔ‫܇ڭ‬͸ɺՃ଎‫Ͱث‬ϚελʔΫϩοΫΛ෼഑͢ΔͷͰ͋Ε͹ɺεΠονϯ
άͳͲͷλΠϛϯάʹࢸΔ·ͰϚελʔΫϩοΫΛར༻ͯ͠ੜ੒͢Δ΂͖Ͱ͋Δɺͱ͍͏͜ͱ
ͩΖ͏ɻϦοϓϧͷΑ͏ʹ৔߹ʹΑͬͯ͸௿‫ݮ‬͢Δ͜ͱ͕ࠔ೉ͳ΋ͷͰ͋ͬͯ΋ɺՃ଎‫ث‬ͷप‫׬ʹظ‬શʹಉ‫͍ͯ͠ظ‬ΔͳΒ͹ɺରॲ͕Մೳͱ
ͳΔ͜ͱ΋͋ΔͷͰ͋ΔɻͷσʔλΛऔಘ͢Δ͜ͱ͔͠Ͱ͖ͳ͍ɻEPICS
ͷνϟϯωϧΞΫηεͰ͸ɺωοτϫʔΫͷঢ়ଶʹ΋ΑΔ͕ 25 Hz Ͱͷσʔλऔಘ͸೉͍͠ɻ͜ͷΑ͏ʹͯ͠ूΊͨσʔλͷηοτΛɺʮඇಉ‫ظ‬σʔλʯͱ‫͠ʹͱ͜Ϳݺ‬Α͏ɻඇಉ‫ظ‬σʔλ͔͠ଘࡏ͍ͯ͠ͳ͍৔߹ɺྫ͑͹ΠϯλʔϩοΫ͕ൃใͯ͠ϏʔϜ͕ఀࢭͨ͠γϣοτͷσʔλΛબΜͰϙετϞʔλϜͳղੳΛ͠Α͏ͱͯ͠΋ɺ͜Ε͸ෆՄೳͰ͋Δɻ
ਤ 25 ʹࣔ͢Α͏ʹɺϏʔϜͷγϣοτຖʹ

4.3 ಉ‫ظ‬σʔλ‫ܥ‬ͷߏங
RCS ͷϏʔϜௐ੔͸ɺओʹγϯάϧγϣο
τϞʔυɺͭ·ΓϦΫΤετʹΑΓ linac ͔Β

1 ൃͷϏʔϜ͕‫͞څڙ‬ΕΔϞʔυͰߦΘΕ͍ͯΔɻ͞·͟·ͳϏʔϜϞχλʔͷ‫ܭ‬ଌ‫ܥ‬͸ϏʔϜτϦΨʔͰಈ࡞͍ͯ͠ΔͷͰɺσʔλͷऔಘ͸ϏʔϜΛܸͬͨ‫Ͱޙ‬Ώͬ͘Γͱߦ͏͜ͱ͕Ͱ
͖ΔɻEPICS Ϩίʔυͱͳ͍ͬͯΔσʔλ͸νϟϯωϧΞΫηεΛߦ͑͹Α͘ɺ·ͨɺΦγϩείʔϓ͔Β௚઀ VXI-11 ΍ GPIB ͳͲͰσʔλΛμ΢ϯϩʔυͯ͠΋Α͍ɻҰํɺར༻ӡస࣌ʹ͸ RCS ͸ 25 Hz ͷ‫܁‬Γฦ͠Ͱӡస͍ͯ͠ΔͷͰɺ্‫ه‬ͷΑ͏ͳํ๏Ͱ
͸ɺϏʔϜϞχλʔɺ‫ܭ‬ଌ‫ʹث‬ΞΫηεͨ࣌͠λάΛ෇͚ͨͱ͖ɺ͋ΔλάͷϏʔϜγϣοτ
ͷ‫ܭ‬ଌσʔλͷηοτ͸ʮಉ‫ظ‬σʔλʯͱͳΔɻಉ‫ظ‬σʔλ͕औಘͰ͖Δ‫( ܥ‬ಉ‫ظ‬σʔλ‫͕ )ܥ‬ߏஙͰ͖Ε͹ɺϏʔϜγϣοτຖͷ‫ࢹ؂‬΍ɺඞཁʹ͓͍ͯղੳΛߦ͏͜ͱ͕Ͱ͖Δɻ΋ͪΖΜɺ

25 Hz ͷߋ৽ϨʔτͰऔಘͰ͖Δσʔλྔ (1 αΠΫϧ͋ͨΓ਺े͔Β਺ඦ఺ͷ೾‫ )ܗ‬ͷ΋ͷʹ‫ݶ‬ΒΕɺྫ͑͹ 54 ୆ͷ BPM ͷ CODɺϩεϞχλʔ೾‫͕͜Ͳͳܗ‬Εʹ͋ͨΔɻWCM ͷϏʔϜ೾‫ܗ‬΍ RF ͷ೾‫Ͳͳܗ‬ɺߴ଎ͳαϯϓϦϯά
͕ཁ‫͞ٻ‬Ε 1 αΠΫϧ͋ͨΓ਺ϝΨ఺ͱͳΔΑ͏ͳ೾‫ܗ‬ͷ‫ه‬࿥͸‫ݱ‬ঢ়ͷٕज़Ͱ͸ෆՄೳͰ͋Δɻ͜ͷઅͰ͸ɺRCS ʹ͓͚Δಉ‫ظ‬σʔλ‫ͱܥ‬λΠϛϯάγεςϜͷؔ܎ʹ͍ͭͯ঺հ͍ͯ͜͠

10－ 15

ਤ 26: ϦϯάϝϞϦͷ֓೦ਤɻਤ 27: RCS BPM ͷಉ‫ظ‬σʔλ‫ܥ‬ͷߏ੒ɻ͏ [17]ɻ

25 Hz Ͱߋ৽͞ΕΔσʔλͷར༻ʹ͋ͨͬͯܽམͳ࣮֬͘ͳσʔλΛऔಘ͢ΔͨΊʹɺBPM
ͳͲͷ‫ܭ‬ଌ‫Ͱܥ‬͸ɺಠࣗͷϦϑϨΫςΟϒϝϞ

τϦΨʔΧ΢ϯτ஋͸ɺ32 Ϗοτͷ਺஋Ͱ͋Γɺ

232 /25[Hz]/3600[hour/s] = 47721[hours] (4)ϦωοτϫʔΫΛߏங͠ɺϦϑϨΫςΟϒϝϞ

Ͱ͋Δ͔Βɺ47000 ࣌ؒҎ্ಉҰͷΧ΢ϯτͱͳϦͷ޿େͳϝϞϦۭؒΛϦϯάϝϞϦͱͯ͠‫׆‬Δ͜ͱ͸ͳ͍ͨΊϏʔϜγϣοτͷλά (Ϗʔ༻͍ͯ͠ΔɻϦϯάϝϞϦͷ֓೦ਤΛਤ 26 ʹϜφϯόʔ) ͱͯ͠༻͍Δ͜ͱ͕Ͱ͖Δ (࣮ࡍʹࣔ͢ɻߋ৽͞ΕΔσʔλΛॱʹ‫ه‬࿥͠ɺ͋Δ਺͸ɺຖ೥ͷఀిͷͨΊʹɺΧ΢ϯτ஋͸ϦηοΛӽ͑Δͱઌ಄ͷΞυϨε͔ΒσʔλΛ্ॻ͖τ͞ΕΔ)ɻ

͍ͯ͘͠ߏ଄ͱͳ͍ͬͯΔɻRCS BPM ͷ৔

J-PARC Ͱ͸ɺλΠϛϯάγεςϜͷ࣋ͭ৘߹ɺ਺ඦγϣοτΛ‫ه‬࿥Ͱ͖ΔϦϯάϝϞϦ͕ใͱ BPM ౳ଌఆ‫ͱܥ‬ͷ‫͠౉ڮ‬Λߦ͏Ϟδϡʔ֬อ͞Ε͍ͯΔɻ

ϧͱͯ͠ɺτϦΨΧ΢ϯλϘʔυ (TCB) ͕։‫ه‬࿥͞ΕͨσʔλΛҰఆִؒ͝ͱʹ‫ʹػࢉܭ‬ൃ͞ΕͨɻTCB ͸ɺ25 Hz τϦΨʔຖʹ TCB

ΑΓσΟεΫʹμϯϓͯ͠΍Ε͹ɺܽམͷͳ͍͕ड৴ͨ͠τϦΨʔͷΧ΢ϯτ஋Λੜ੒͢ΔͱσʔλΛ‫ه‬࿥͢Δ͜ͱ͕Ͱ͖Δɻ͔͠͠ͳ͕Βɺͱ΋ʹ VME ‫૸Ͱ্ػࢉܭ‬ΔΞϓϦέʔγϣϯσʔλͷ‫༻׆‬ͷ‫͔఺؍‬Β͢Δͱ͜Ε͚ͩͰ͸ෆ΁ͷׂΓࠐΈΛൃੜͤ͞Δ͜ͱ͕Ͱ͖Δ VME

े෼Ͱ͋ΔɻϏʔϜφϯόʔ΍ߦ͖ઌ৘ใ (λϞδϡʔϧͰ͋Δɻਤ 27 ʹ TCB Λ‫ͨ͠༻׆‬Πϓ) Λಉ࣌ʹ‫ه‬࿥ͯ͠΍Βͳ͚Ε͹ɺ‫Ͱޙ‬ղ

BPM ͷಉ‫ظ‬σʔλ‫ܥ‬ͷߏ੒Λࣔ͢ɻBPM ͷੳɺ‫ূݕ‬Λߦ͏͜ͱ͕ෆՄೳͰ͋Δ͔ΒͰ͋Δɻॲཧ‫ܥ‬͸ɺෳ਺ͷ੍‫ࣨޚ‬ɺ૷ஔࣨʹ෼ࢄͯ͠ઃ

͜ͷͨΊɺλΠϛϯάγεςϜͷ࣋ͭ৘ใͱσʔஔ͞Ε͍ͯΔɻલड़ͷΑ͏ʹɺσʔλͷू໿ΛλΛ݁ͼ෇͚ΔͨΊͷ࢓૊Έ͕ඞཁͰ͋Δɻ

໨తͱͯ͠ɺBPM ༻ͷϦϑϨΫςΟϒϝϞϦ

λΠϓ఻ૹͷγϦΞϧ௨৴ʹ͓͍ͯɺMSB ͕ωοτϫʔΫ͕ߏங͞Ε͍ͯΔɻTCB ͕Πϯε1 Ͱ͋Δ࣌ʹ͸ಛผͳ৘ใΛૹ৴͍ͯ͠Δ͜ͱτʔϧ͞ΕΔ VME γϟʔγʹ͸ɺλΠϛϯά

͸ઌʹड़΂ͨͱ͓ΓͰ͋ΔɻMR αΠΫϧͷઌ༻ͷϦϑϨΫςΟϒϝϞϦͱ BPM ༻ͷϦϑϨ಄ΛදΘ͢ʮSʯͷଞɺ͜Ε·Ͱʹ‫ج‬४τϦΨʔΫςΟϒϝϞϦͷ྆ํ͕഑ஔ͞Ε͓ͯΓɺTCB

ૹ৴ճ਺Λࣔ͢τϦΨʔΧ΢ϯτ஋ɺMR αΠ͸τϦΨʔຖʹλΠϛϯά༻ϦϑϨΫςΟϒϝ

ΫϧͷԿ൪໨͔Λࣔ͢ MR Χ΢ϯτ஋ͳͲ͕ૹ

ϞϦ͔ΒɺϏʔϜλά৘ใ (τϦΨʔΧ΢ϯτΒΕ͍ͯΔɻ·ͨ͜ΕΒ͸ૹ৴ϞδϡʔϧͷϨ

஋ɺMR Χ΢ϯτ஋ɺλΠϓͳͲ) ͓Αͼ RFM

δελͱͯ͠΋อ࣋͞Εɺૹ৴͞Ε͍ͯΔʮλΠ؅ཧ৘ใΛੜ੒͠ɺBPM ༻ͷϦϑϨΫςΟϒ

ϓʯͱͱ΋ʹϦϑϨΫςΟϒϝϞϦʹΑΓ RCSϝϞϦʹྲྀ͢ɻ

શͯͷλΠϛϯά༻ VME Ͱ‫ڞ‬༗͞Ε͍ͯΔɻ

10－ 16

ਤ 28 ʹࣔ͢Α͏ʹɺRFM ؅ཧ৘ใʹ͸ɺ·ਤ 28: RFM ؅ཧ৘ใɻ

ਤ 30: ಉ‫ظ‬σʔλ‫ʹܥ‬ΑΓ‫ه‬࿥͞ΕͨϏʔϜిྲྀσʔλͷྫɻ

ಉ‫ظ‬σʔλ‫ʹܥ‬ΑΓߦ͖ઌΛ۠ผͯ͠‫ه‬࿥͞Εͨ COD σʔλͷྫΛɺਤ 29 ʹࣔ͢ɻ͜Ε͸ਤ 29: ಉ‫ظ‬σʔλ‫ʹܥ‬ΑΓ‫ه‬࿥͞Εͨ CODશपͷਫฏํ޲ͷ COD ΛՃ଎αΠΫϧத 1 msσʔλͷྫɻ

ִؒͰ‫ه‬࿥ͨ͠΋ͷΛϓϩοτͨ͠΋ͷͰ͋Δɻ
ϓϩοτͷࠨ্ʹ͸ϏʔϜλά͕ɺ·ͨӈ্ʹ͸ beam type ͱͯ͠ɺߦ͖ઌ৘ใΛࣔͯ͋ͣ͠ɺϦϑϨΫςΟϒϝϞϦΛϦϯάϝϞϦͱ͠Δɻ͜ͷ࣌ͷӡసͰ͸ɺMR Ͱ͸Ճ଎‫ޙ‬൒Ͱ RFͯར༻Ͱ͖ΔΑ͏ʹɺσʔλॻ͖ࠐΈΞυϨε͕प೾਺ʹΦϑηοτΛՃ͑ɺऔΓग़͠ͷӡಈྔ

25 Hz ͷߋ৽ϨʔτͰॻ͖ࠐ·ΕΔɻ֤ BPM

Λ 0.1% ఔ౓ௐ੔ͨ͠ӡసΛߦ͍͕ͬͯͨɺ͜

ͷॲཧ‫ܥ‬͸ɺσʔλॻ͖ࠐΈΞυϨεΛࢀর͠ͷ༷ࢠ͕ɺσΟεύʔδϣϯͷେ͖͍ΞʔΫ෦ͯϏʔϜλάͱͱ΋ʹҐஔ೾‫ܗ‬σʔλΛॻ͖ࠐͷ COD มԽͱͯ͠‫ه‬࿥͞Ε͍ͯΔ͜ͱ͕Θ͔ΉɻશσʔλऩूͷͨΊʹɺσʔλऩूΞυϨΔͩΖ͏ɻ͜ͷΑ͏ʹߦ͖ઌΛ۠ผͨ͠σʔλεʹ͸ɺ࠷ۙʹॻ͖ࠐ·ΕͨΞυϨε͕ɺ·ͨ‫ه‬࿥ʹΑΓɺਖ਼֬ͳ‫ࢹ؂‬ɺղੳ͕Մೳͱͳͬͯ

MLF ΞυϨε͓Αͼ MR ΞυϨεʹ͸ɺߦ͖͍ΔɻઌΛ۠ผͨ͠ΞυϨεͷू߹͕ॻ͖ࠐ·ΕΔɻ

25 Hz ͷిྲྀϞχλʔͷશσʔλऩूͷྫਤ 27 ʹ͋ΔΑ͏ʹɺϦϑϨΫςΟϒϝϞϦωο

Λਤ 30 ʹࣔ͢ɻ͜ͷӡసͰ͸ɺMR ޲͚ʹτϫʔΫ্ʹ͋Δ‫ػࢉܭ‬͸ɺఆप‫͜Ͱظ‬ΕΒΛ

2.97 × 1013 pppɺMLF ޲͚ʹ͸ 2.8 × 1013 ppp

ࢀর͠ɺ؅ཧ৘ใʹࣔ͞Εͨ৔ॴͷσʔλΛಡͷ‫څڙͰ౓ڧ‬Λߦ͍͕ͬͯͨɺ໿ 1 ඵʹΘͨͬΈࠐΈɺ25Hz શσʔλΛσΟεΫʹ‫ه‬࿥͢Δ

ͯҰ࣌తʹऔΓग़͞ΕΔϏʔϜిྲྀ͕௿Լͯ͠

ͱͱ΋ʹɺMLF ͓Αͼ MR ͷ࠷৽Ϟχλ஋Λ

͍Δ͜ͱ͕‫ͱͯݟ‬ΕΔɻ࿈ଓͨ͠σʔλͷ‫ࢹ؂‬

EPICS Ϩίʔυͱͯ͠ఏ‫͢ڙ‬ΔɻʹΑΓɺ͜ͷΑ͏ͳҰ࣌తͳϏʔϜిྲྀͷ௿Լ؅ཧ৘ใΛ༻͍ͯσʔλΛ੔ཧ͢Δ͜ͱͰɺΛัଊ͢Δ͜ͱ͕Ͱ͖Δ͚ͩͰͳ͘ɺϏʔϜϩඞཁͳσʔλͷ৔ॴΛ͙͢ʹಛఆͰ͖ΔΑ͏ʹεϞχλʔͷ‫ࢹ؂‬σʔλͱಥ͖߹Θͤɺ࠷ऴత

ͳΓɺσʔλΛར༻ͨ͠‫ূݕ‬ɺղੳ͕ඈ༂తʹʹ͜ͷ‫ݮ‬গ͕ΠΦϯ‫ݯ‬ͷϏʔϜిྲྀͷҰ࣌తͳ༰қʹͳͬͨɻ

௿Լ͕‫ݪ‬ҼͰ͋ͬͨ͜ͱΛಥ͖ࢭΊΔ͜ͱ͕Ͱ

10－ 17





͖ͨɻ͜ͷଞɺଌఆ‫ࣗث‬ମ͕ϦϯάϝϞϦͷߏ੒ͱ

ͳ͍ͬͯΔ΢ΣʔϒΤϯυϨεϨίʔμ (waveendless recorder, WER) ͱ TCB Λ૊Έ߹ΘͤΔ͜ͱͰɺಉ‫ظ‬σʔλ‫ܥ‬͸Ճ଎‫ݯిث‬ͷҟৗ‫؂‬

ࢹ༻్ʹ΋֦ு͞Ε͍ͯΔɻಉ‫ظ‬σʔλ‫ܥ‬͸ RCS ͷӡస‫ʹࢹ؂‬ෆՄܽͳ

(a) ‫ط‬ଘγεςϜɻ΋ͷͱͳ͍ͬͯΔɻ͜ͷಉ‫ظ‬σʔλ‫ܥ‬ͷߏஙʹ͸λΠϛϯάγεςϜ͔Βͷ৘ใ͕ෆՄܽͰ͋









ΓɺλΠϛϯάγεςϜͱ͍͏΋ͷͷ໨త͕୯

ʹτϦΨʔ΍ήʔτΛग़ྗ͢Δ͚ͩͰͳ͍ɺͱ



͍͏͜ͱΛࣔ͢޷ྫͱ‫͑ݴ‬ΔͩΖ͏ɻ

5 ࣍ੈ୅λΠϛϯάγεςϜʹ޲͚ͯ















2006 ೥ͷ linac ϏʔϜίϛογϣχϯά։͔࢝Β 10 ೥ʹΘͨΓେ͖ͳ໰୊ͳ͘ӡసΛଓ͚ͯ(b) ࣍ੈ୅γεςϜɻ͖ͨ J-PARC ͷ (εέδϡʔϧυ) λΠϛϯά

ਤ 31: ‫ط‬ଘγεςϜͱ࣍ੈ୅γεςϜͷߏ੒ɻγεςϜͰ͋Δ͕ɺࠓ‫ޙ‬ͷ௕‫ظ‬తͳҡ࣋͸ࠔ೉ਤதɺ੨ઢ͸ 3 ຊͷి‫ؾ‬έʔϒϧͷू߹ɺ੺ઢ

ͱͳͬͨɻE/OɺO/E Ϟδϡʔϧʹ࢖༻͍ͯ͠

͸ 3 ຊͷޫέʔϒϧͷू߹ΛදΘ͢ɻ࣍ੈ୅γΔޫૉࢠ (Finisar v23826) ͷੜ࢈தࢭͰ͋ΔɻεςϜͰͷۭ৭͸ 1 ຊͷޫέʔϒϧΛදΘ͢ɻ‫͍ͯ͠༻࢖ࡏݱ‬Δ E/OɺO/E Ϟδϡʔϧ͸े෼ʹ༧උ඼Λ֬อͯ͋͠Δ΋ͷͷɺ࣍ੈ୅γε͔ͯΒड৴Ϟδϡʔϧʹೖྗ͞ΕΔͨΊʹɺಛςϜΛ։ൃ͢Δඞཁ͕ग़͖ͯͨɻ
ҎԼʹɺ࣍ੈ୅λΠϛϯάγεςϜͷ֓ཁΛʹϊΠζ‫ڥ؀‬ͷѱ͍ MR ͷి‫Ͱࣨݯ‬͸ϊΠζͷ
ࠞೖʹΑΓ‫࡞ޡ‬ಈΛ‫͕ͨͬ͋ͱ͜͢͜ى‬ɻͦ͜঺հ͠Α͏ɻ

Ͱɺߴ଎γϦΞϧ௨৴ٕज़ʹΑΓ 1 ຊͷޫέʔ

5.1 ։ൃʹ͋ͨͬͯ࣍ੈ୅γεςϜͷ։ൃʹ͋ͨͬͯ࠷΋ॏࢹͨ͜͠ͱ͸ɺ‫ط‬ଘγεςϜͱ‫ڞ‬ଘͯ͠ಈ࡞Ͱ͖Δ
͜ͱͰ͋ΔɻJ-PARC ͷ‫ݐ‬ઃ‫ͱظ‬ҟͳΓɺશͯͷλΠϛϯάγεςϜ‫ثػ‬ΛҰ‫ʹؾ‬ஔ͖‫͑׵‬Δ

ϒϧʹ 3 ͭͷ৴߸ΛσʔλԽͯ͠ૹΔ͜ͱͱ͠ɺ
·ͨ৽͍͠ड৴Ϟδϡʔϧ͸ޫ৴߸Λ௚઀ೖྗ
͢Δ͜ͱͱͨ͠ɻ

5.2 ࣍ੈ୅γεςϜͷߏ੒֓ཁਤ 31 ʹ‫ط‬ଘγεςϜͱ‫ࡏݱ‬։ൃதͷ࣍ੈ୅͜ͱ͸ɺ༧ࢉͷ‫ͯͦ͠఺؍‬ӡ༻ͷ‫͔఺؍‬Β΋ෆՄೳͰ͋Δ͔ΒͰ͋ΔɻैͬͯɺλΠϓྻͷߟ͔͑ͨɺσΟϨΠΧ΢ϯλʔͷಈ࡞౳ʹ͍ͭͯγεςϜͷߏ੒Λൺֱͨ͠ɻલड़ͷΑ͏ʹɺ‫ط‬ଘγεςϜͰ͸ૹ৴Ϟδϡʔϧ͔Β 12 MHz ΫϩοΫɺ‫ج‬४τϦΨʔɺλΠϓͷ 3 छͷ৴߸͕͸ɺ‫ط‬ଘγεςϜΛ౿ऻ͢Δ΋ͷͱͳΔɻ‫ط‬ଘγεςϜ͸ɺ‫ج‬४τϦΨʔɺ12 MHz ΫϩοΫɺ3 छྨͷ৴߸ΛผʑͷέʔϒϧͰૹ৴͠
͍ͯΔɻ͜Ε͸Πϯϑϥ্ͷෛ୲ͱͳ͍ͬͯͨɻ
·ͨɺड৴Ϟδϡʔϧۙ͘ͰҰ౓ి‫ʹؾ‬ม‫͠׵‬

3 ຊͷέʔϒϧͰग़ྗ͞ΕɺϑΝϯφ΢τ͞Εͨ‫ ʹޙ‬E/O ʹΑΓޫ৴߸ʹม‫͞׵‬Ε֤ࢪઃ΁ૹ৴͞ΕΔɻ֤ࢪઃͰ͸ɺO/E ʹΑΓి‫ؾ‬৴߸ʹม‫͞׵‬Εͨ 3 छͷ৴߸Λड৴Ϟδϡʔϧ΁ೖྗ͢Δߏ੒ʹͳ͍ͬͯΔɻ

10－ 18

type
memoryਤதɺԫ৭Ͱࣔͨ͠ͷ͕৽‫ن‬։ൃཁૉͰ͋Δɻ࣍ੈ୅γεςϜͷ৽͍͠ૹ৴Ϟδϡʔϧ͸ 3 छͷ৴߸ΛγϦΞϧ௨৴ʹΑΓ 1 ຊͷޫ৴߸ʹ·

ref
trig

ͱΊͯग़ྗͰ͖ΔΑ͏ʹ͢Δͱͱ΋ʹɺ‫ط‬ଘγtransmitter
payloadevent
generator

GTP(SERDES)SFPεςϜͱಉ͡ 3 छͷి‫ؾ‬৴߸Λग़ྗ͢ΔɻγϦΞϧ௨৴ͷৄࡉʹ͍ͭͯ͸‫ޙ‬ड़͢Δɻ‫ط‬ଘγε

12MHz
clk

PLL

144MHzopticalcableςϜಉ༷ͷ৴߸Λग़ྗ͢Δ͜ͱͰɺ‫ط‬ଘͷλΠϛϯάड৴ઃඋʹ͍ͭͯ͸ͦͷ··ར༻Ͱ͖ɺ‫ط‬ଘγεςϜͱ‫ڞ‬ଘ͠ͳ͕Β࣍ੈ୅γεςϜ΁ͷ

similarlogic
asexisting
timingreceiverҠߦΛ઴࣍ਐΊΒΕΔΑ͏ʹͨ͠ɻޫૉࢠͱ͠
ͯ͸ɺ࠷ۙσʔληϯλʔ౳ߴ଎௨৴ʹ޿͘༻͍ΒΕ͍ͯΔ SFP (small form factor pluggable)

12MHz clk
ref trig

event
analyzerଟஈͷޫϑΝϯφ΢τʹΑΓ෼഑͞Εɺ৽͍͠GTP(SERDES)

SFP

type

receiverͷޫτϥϯγʔόΛ࠾༻ͨ͠ɻ
ૹ৴Ϟδϡʔϧ͔Βͷޫ৴߸͸ɺඞཁʹΑΓseed clk
144MHzਤ 32: ࣍ੈ୅λΠϛϯάγεςϜʹ͓͚Δߴ଎
γϦΞϧ௨৴ɻ

ड৴Ϟδϡʔϧʹೖྗ͞ΕΔɻ৽ड৴Ϟδϡʔϧ͸ड৴ͨ͠γϦΞϧ৴߸Λσίʔυ͠ɺ಺෦Ͱ 12 MHz ΫϩοΫɺ‫ج‬४τϦΨʔɺλΠϓΛ෮߸͢Δɻ෮߸͞Εͨ৴߸ͷ࢖ͬͨಈ࡞ʹ͍ͭͯ͸ɺ‫ط‬ଘͷड৴Ϟδϡʔϧͱಉ͡Ͱ͋Δɻ

VME ͷड৴ϞδϡʔϧʹՃ͑ɺPLC ‫ܕ‬ͷड৴Ϟδϡʔϧ΋։ൃͨ͠ɻ
·ͨɺ৽γεςϜʹΑΓ෼഑͞Εͨޫ৴߸Λ࢖ͬͯ‫ط‬ଘͷड৴ϞδϡʔϧΛಈ࡞ͤ͞ΔͨΊʹɺ৽ O/E ϞδϡʔϧΛ։ൃͨ͠ɻ৽ O/E Ϟδϡʔϧ͸ɺޫ৴߸Λड৴͠ɺγϦΞϧ৴߸Λσίʔυͯ͠ੜ੒͞ΕΔΫϩοΫɺ‫ج‬४τϦΨʔɺλΠϓΛి‫ؾ‬৴߸Ͱग़ྗ͢ΔϞδϡʔϧͰ͋Δɻ

5.3 ߴ଎γϦΞϧ௨৴ਤ 32 ʹɺ࣍ੈ୅λΠϛϯάγεςϜʹ͓͚Δ
ߴ଎γϦΞϧ௨৴ͷߏ੒Λࣔ͢ɻ৽ૹ৴ϞδϡʔϧͰ͸ 12 MHz ΫϩοΫຖʹɺγϦΞϧ௨৴ͷϖΠϩʔυͱͳΔʮΠϕϯτʯΛੜ੒͢ΔɻXilinx FPGA ͷߴ଎γϦΞϧ௨৴τϥϯγʔόͰ͋Δ GTP (࠷େ 3.2 Gbps)
Λ༻͍ͯΠϕϯτΛ SERDES ʹΑΓγϦΞϧ
Խͯ͠ૹ৴͢Δɻ࣮ࡍʹૹ৴͞ΕΔγϦΞϧ௨৴ͷϓϩτίϧ

Λɺද 1 ʹࣔ͢ɻγϦΞϧ௨৴Ͱ༻͍ΒΕΔ

8B/10B ม‫[ ׵‬18] ʹ͓͍ͯ͸ɺ࣮ࡍͷ 8 ϏοτͷσʔλͰ͋ΔʮDʯͱɺಛผͳҙຯΛ࣋ͭʮKʯΩϟϥΫλ͕͋ΔɻK28.5 ͸ɺ8B/10B ʹ͓͍ͯΧϯϚΩϟϥΫλͱͯ͠ɺσʔλྻͷ۠੾ΓΛࣔ͢ΩϟϥΫλͱͯ͠༻͍ΒΕΔɻ͋Δ
Πϕϯτγʔέϯε͸ɺ(a) ʹࣔ͢Α͏ʹΧϯϚʹଓ͖ɺͦͷΠϕϯτͷҙຯΛදΘ͢σʔλɺʮEʯ͕ૹ৴͞ΕΔɻ3 ൪໨͔Β 12 ൪໨ʹ͸ඞཁʹԠ͡ɺ߹‫ ܭ‬80 ϏοτͷσʔλΛೖΕΔ͜ͱ
͕Ͱ͖Δɻ8 Ϗοτ͕ 12 ‫ݸ‬࿈ଓ͢ΔྻͱͳΓɺ

8B/10B ม‫ૹͯ͠׵‬৴͞ΕΔͨΊɺ௨৴଎౓͸
1.44 Gpbs ͱͳΔɻΞΠυϧ࣌ʹ͸ɺnull event ͕ৗ࣌ૹ৴͞Ε
͍ͯΔɻૹ৴Ϟδϡʔϧʹ‫ج‬४τϦΨʔ͕ೖྗ͞ΕΔͱɺtrigger event ͕ૹ৴͞ΕΔɻType

event Ͱ͸ɺγʔέϯεͷ 3 ൪໨͔Β 6 ൪໨·Ͱʹ mode1 . . . mode4 ʹରԠ͢Δ type1 . . . type4
͕‫·ؚ‬ΕΔɻͦͷଞɺ‫ط‬ଘλΠϛϯάγεςϜ
Ͱૹ৴͞Ε͍ͯΔɺS ΍ S Χ΢ϯτ஋ɺτϦΨʔΧ΢ϯτ஋͕Πϕϯτͱͯ͠ఆٛ͞Εɺૹ৴͞

10－ 19ද 1: γϦΞϧ௨৴ͷϓϩτίϧ
(a) ϑΥʔϚοτ
seq

1
K28.5

2
E

3
D(p1)

4
D(p2)

Null

1
K28.5

2
E(null)

3
D0.0

4
D0.0

Trig

1
K28.5

2
E(trig)

3
D0.0

4
D0.0

5
D(p3)

6
D(p4)

7
D(p5)

8
D(p6)

9
D(p7)

10
D(p8)

11
D(p9)

12
D(p10)

9
D0.0

10
D0.0

11
D0.0

12
D0.0

9
D0.0

10
D0.0

11
D0.0

12
D0.0

9
D0.0

10
D0.0

11
D0.0

12
D0.0

9
D0.0

10
D0.0

11
D0.0

12
D0.0

9
D0.0

10
D0.0

11
D0.0

12
D0.0

9
D0.0

10
D0.0

11
D0.0

12
D0.0

(b) Null event. E(null)=D0.0 (0x00)
5
D0.0

6
D0.0

7
D0.0

8
D0.0

(c) Trigger event. E(trig)=D1.0 (0x01)
5
D0.0

6
D0.0

7
D0.0

8
D0.0

(d) Type event. E(type)=D2.0 (0x02)
Type

1
K28.5

2
E(type)

3
type1

4
type2

5
type3

6
type4

7
D0.0

8
D0.0

(e) S event. E(S)=D3.0 (0x03)
S

1
K28.5

2
E(S)

3
D0.0

4
D0.0

2

Scnt

1
K28.5

3
Scnt1

2

Tcnt

1
K28.5

5
D0.0

6
D0.0

7
D0.0

8
D0.0

(f) S count event. E(Scnt)=D4.0 (0x04)
E(Scnt)

4
Scnt2

5
Scnt3

6
Scnt4

7
D0.0

8
D0.0

(g) Trigger count event. E(Tcnt)=D5.0 (0x05)
E(Tcnt)

3
Tcnt1

4
Tcnt2

5
Tcnt3

6
Tcnt4

7
D0.0

8
D0.0

ΕΔɻΠϕϯτ͸ 256 ௨ΓఆٛͰ͖ΔͷͰɺࠓφϥΠβ͸ Trigger event Λड৴ͨ࣌͠ʹτϦ‫ޙ‬ͷඞཁʹԠͯ͡Πϕϯτछྨͷ௥ՃΛߦ͍৘ΨʔΛग़ྗ͠ɺ·ͨɺType event Λड৴ͨ࣌͠

ใΛૹ৴͢Δ͜ͱ͕ՄೳͰ͋Δɻ

ʹ͸λΠϓΛग़ྗ͢ΔɻΫϩοΫɺτϦΨʔɺλγϦΞϧԽ͞Εͨσʔλ͸ɺSFP ޫϞδϡʔΠϓ͸ɺ‫ط‬ଘड৴Ϟδϡʔϧͱಉ༷ͷճ࿏ʹೖϧʹΑΓɺޫϑΝΠόʔ‫ܦ‬༝Ͱ৽ड৴Ϟδϡʔྗ͞Εɺશମͱͯ͠‫ط‬ଘγεςϜͱಉ༷ͷಈ࡞ϧʹಧ͚ΒΕΔɻ

Λߦ͏ɻͦͷଞΠϕϯτ΋ղऍ͞Εɺ‫ط‬ଘड৴৽ड৴Ϟδϡʔϧଆͷ GTP Ͱ͸ɺΫϩοΫϞδϡʔϧͱಉ༷ʹॲཧ͞ΕΔɻ

σʔλϦΧόϦ (clock data recoveryɺCDR) ʹ͜ͷΑ͏ʹɺߴ଎γϦΞϧ௨৴ʹΑΓ 3 छྨΑΓ 144 MHz ΫϩοΫ͕෮߸͞ΕΔͱͱ΋ʹͷ৴߸Λ 1 ຊͷޫέʔϒϧͰૹ৴͢Δ͜ͱ͕Մσʔλ͕நग़͞ΕΔɻ෮߸͞Εͨ 144 MHz Ϋೳͱͳͬͨɻ͜͜ʹ஫ҙ͠ͳ͚Ε͹ͳΒͳ͍͜ϩοΫ͸ૹ৴ʹ༻͍ΒΕΔΫϩοΫʹ‫׬‬શʹಉͱ͸ɺGTP ౳ͷτϥϯγʔόʔ͸ͦͷ··Ͱ͸‫ͨ͠ظ‬΋ͷͱͳ͍ͬͯΔɻड৴σʔλ͸Πϕϯ

ి‫ݯ‬౤ೖຖʹ஗Ԇ͕ඍົʹҟͳΔ఺Ͱ͋Δɻ஗

τΞφϥΠβʹೖྗ͞ΕɺΠϕϯτΞφϥΠβ಺ԆͷมԽྔ͸γϦΞϥΠβʹ‫͞څڙ‬ΕΔΫϩο

ʹ࣮૷͞Ε͍ͯΔΧϯϚσΟςΫλͰ 12 MHz

Ϋͷ 1 प‫ظ‬ఔ౓Ͱ͋Γɺ144 MHz ͷ࣌ʹ͸໿ͷ‫܁‬Γฦ͠Ͱૹ৴͞Ε͍ͯΔΧϯϚΛ‫ݕ‬ग़͠ɺ

7 ns ʹ΋ͳͬͯ͠·͏ɻ‫ݻ‬ఆ஗ԆΛ࣮‫͢ݱ‬Δʹ

12 MHz ΫϩοΫͱͯ͠ग़ྗ͢ΔɻΠϕϯτΞ

͸ɺจ‫[ ݙ‬19] ͷΑ͏ͳճ࿏ߏ੒͕ඞཁͰ͋Δ (͋10－ 20tranmitter module

pk-pk 194ps

PLC
receivernew
O/E

moduleRMS 22ps

opt fanout

ਤ 34: ςΫτϩχΫε DPOJET ʹΑΔ෮߸

12 MHz ͷδολʔଌఆ݁Ռɻ

receiver moduleਤ 33: ࣍ੈ୅λΠϛϯάγεςϜϞδϡʔϧ‫܈‬ɻ

DPOJET ʹΑΔ෮߸ 12 MHz ΫϩοΫͷ
δολʔଌఆ݁ՌͷώετάϥϜΛਤ 34 ʹࣔ͢ɻδολʔ͸ RMS Ͱ 22 psɺpk-pk Ͱ 200 ps·Γʹٕज़తৄࡉͰ͋ΔͨΊʹɺ͜ͷߨٛϊʔऑ ͱ FPGA ͷ I/O ͷδολʔͱಉఔ౓Ͱ͋ΓɺτͰ͸આ໌Λল͘)ɻJ-PARC ࣍ੈ୅λΠϛϯे෼ʹཁ‫ٻ‬Λຬͨ͢΋ͷͰ͋Δ͜ͱ͕֬ೝͰ͖

άγεςϜʹ͓͍ͯ΋จ‫ͱݙ‬ಉ༷ͷߏ੒͕࠾༻

Δɻ‫ج‬४τϦΨʔग़ྗ΍σΟϨΠυύϧεग़ྗ͞Ε͍ͯΔɻ

ͷδολʔ͸௕प‫͋Ͱظ‬Δ͜ͱ͔Β DPOJET

5.4 ։ൃ͓Αͼࢼ‫ݧ‬ͷঢ়‫گ‬Λ࢖༻͠ͳ͍ଌఆͱͳΔ͕ɺಉఔ౓ͷδολʔ࣍ੈ୅λΠϛϯάγεςϜͷϞδϡʔϧ‫܈‬͸ੑೳͰ͋ͬͨɻ

2017 ೥౓ʹಈ࡞‫ূݕ‬ͷͨΊͷઌߦ‫͕ػ‬੡࡞͞Ε͜ͷߨ͕ٛߦΘΕΔ 2018 ೥ 9 ݄ʹ͸ςετ

ͨɻਤ 33 ʹɺ੡࡞͞Εͨઌߦ‫ػ‬Ϟδϡʔϧ‫܈‬Λ‫͍͓ͯʹڥ؀‬௕‫҆ظ‬ఆಈ࡞ͷ֬ೝ͕։࢝͞Εͯࣔ͢ɻ͜ΕΒͷϞδϡʔϧΛ૊Έ߹Θͤͨಈ࡞

͍Δ༧ఆͰ͋Δɻ2018 ೥ 12 ݄ʹ͸தԝ੍‫ޚ‬౩‫ݧࢼূݕ‬ΛਐΊ͍ͯΔɻ

ʹ৽ૹ৴Ϟδϡʔϧ͕Πϯετʔϧ͞Εɺӡ༻ࢼ‫ݧ‬͸ɺλΠϓྻ΍ LUT ͷಈ࡞ͳͲͷϩδοΛ։࢝͢Δɻલड़ͷΑ͏ʹ৽γεςϜ͸‫ط‬ଘγΫతͳ‫ͱূݕ‬ɺग़ྗ͞ΕΔΫϩοΫ΍τϦΨʔεςϜͱ‫ڞ‬ଘͰ͖ΔΑ͏ʹઃ‫͞ܭ‬Ε͍ͯΔͨΊɺͷ೾‫ܗ‬ɺδολʔ౳ͷੑೳతͳධՁͷ྆໘͔Βड৴ଆͷγεςϜͷҠߦ͸਺೥͔͚ͯॱ࣮࣍ߦ

ߦΘΕ͍ͯΔɻ͜͜Ͱ͸ɺΫϩοΫͷδολʔ͍ͯ͘͠ɻଌఆ݁ՌΛ঺հ͠Α͏ɻ৽ड৴ϞδϡʔϧͰ෮߸͞ΕΔ 12 MHz Ϋ

6 ͓ΘΓʹ

ϩοΫ͸σΟϨΠΧ΢ϯλʔͷ 96 MHz ͷ‫ج‬४

J-PARC ͷλΠϛϯάγεςϜʹ͍ͭͯɺͦ

ͱͳΔ͚ͩͰͳ͘ɺγϯΫϩτϩϯͷ LLRF γͷ֓ཁͱઃ‫ࢥܭ‬૝ɺͦͯ͠ࠓ‫ޙ‬ͷల։ʹ͍ͭͯεςϜͷγεςϜΫϩοΫੜ੒౳ʹ΋࢖༻͞Εड़΂ͨɻλΠϛϯάγεςϜͱϏʔϜӡసͷؔΔͨΊɺ12 MHz ΫϩοΫͷδολʔੑೳ͸ॏΘΓʹॏ఺Λஔ͍ͨ‫ه‬ड़ͱͳΔΑ͏ʹ౒ΊͨͭཁͰ͋ΔɻΫϩοΫͷδολʔ͸ɺߴ଎Φγϩ΋ΓͰ͋Δɻ‫ڧ‬ௐ͍ͨ͜͠ͱ͸ɺJ-PARC ͷλείʔϓʹΑΓଌఆͰ͖ΔɻςΫτϩχΫεͷ

ΠϛϯάγεςϜ͸‫ࡏݱ‬ͷେ‫౓ڧ‬ϏʔϜӡసʹΦγϩείʔϓͳΒ͹ DPOJETɺϨΫϩΠͳΒେ͖ͳߩ‫ݙ‬ΛՌ͖ͨͯͨ͠ͱ͍͏͜ͱͰ͋Δɻ

͹ JTA ͱ͍͏ΞϓϦέʔγϣϯ͕༻͍ΒΕΔɻ

චऀ͸λΠϛϯάγεςϜͷ࢓ࣄ͚ͩΛͯ͜͠ΕΒ͸ɺߴ଎ͳαϯϓϦϯάͰେྔͷσʔλ͍ΔΘ͚Ͱ͸ͳ͘ɺγϯΫϩτϩϯͷ RF άϧʔΛัଊ͠ɺ౷‫ॲܭ‬ཧΛߦ͏΋ͷͰ͋Δɻ

ϓʹଐ͠ɺLLRF ੍‫ޚ‬γεςϜͷ։ൃ΍ RCSɺ

10－ 21MR ͷϏʔϜௐ੔Λߦ͖ͬͯͨɻ21 ੈ‫ॳل‬಄ʹ͏ͳߨٛͷ‫ػ‬ձΛ༩͑ͯͩͬͨ͘͞ OHO’18 ߍλΠϛϯάγεςϜͷઃ‫ܭ‬Λ࢝Ίͨ͜Ζ͸·ͩ௕ͷখྛ޾ଇࢯɺJ-PARC ηϯλʔͷখؔ஧ࢯɺ

‫ݧܦ‬ෆ଍Ͱ͕͋ͬͨɺϏʔϜӡస΍ϏʔϜ෺ཧ௕୩઒࿨உࢯʹ‫͢·͠ँײ‬ɻʹؔ͢Δ‫ͱݧܦ‬஌ࣝΛ࣋ͭ͜ͱͰɺλΠϛϯά
γεςϜࣗମʹ͍ͭͯͷཧղ͕ਂ·ͬͨ͜ͱΛࢀߟจ‫ݙ‬‫͍ͯ͡ײ‬ΔɻJ-PARC ࣍ੈ୅λΠϛϯάγες

[1] “Accelerator technical design report forϜͷઃ‫ܭ‬ɺߏஙʹ͓͍ͯ΋͜ͷ‫ݧܦ‬ɺ஌ࣝΛੜJ-PARC,” JAERI-TECH 2003-044, 2003.

͔͢͜ͱ͕Ͱ͖ͨ͜ͱΛਃ͠ఴ͓͖͍͑ͯͨɻ

[2] F. Tamura et al., “Timing system for࠷ॳʹड़΂ͨΑ͏ʹλΠϛϯάʹؔ͢Δཁ‫ٻ‬

J-PARC,” in Proceedings of the Parti-͸Ճ଎‫ࢪث‬ઃ͝ͱʹҧ͏ͨΊɺՃ଎‫ث‬ͷλΠϛcle Accelerator Conference (PAC 2005),ϯάγεςϜͷઃ‫ͯͬͨ͋ʹܭ‬͸ɺͦͷՃ଎‫ث‬

2005, pp. 3853–3855.

͕ͲͷΑ͏ͳಈ࡞Λߦ͏ͷ͔Λཧղͨ͠͏͑Ͱ

[3] “Experimental physics and industrial࠷దͳղΛߟ͍͑ͯ͘͜ͱ͕ඞཁͰ͋Δɻ

control system,” https://epics.anl.gov/.

ҰํɺՃ଎‫ث‬λΠϛϯάγεςϜͷੈքʹ΋

[4] S. Wang, S. Fu, and T. Kato, “The de-ඪ४Խͷಈ͖͕͋ΔɻMicro Research Finlandvelopment and beam test of an rf chop-(MRF) [20] ੡ͷλΠϛϯάγεςϜϞδϡʔϧ

per system for j-parc,” Nuclear Instru-‫܈‬͸ɺΠϕϯτൃੜ‫( ث‬event generatorɺEVG)

ments and Methods in Physics ResearchͱΠϕϯτड৴‫( ػ‬event receiverɺEVR) ͷ૊

Section A: Accelerators, Spectrometers,߹ͤͰߏ੒͞Εɺ֓೦తʹ͸ J-PARC ࣍ੈ୅

Detectors and Associated Equipment, vol.

λΠϛϯάγεςϜͱಉ༷ͷ΋ͷͰ͋ΔɻMRF

547, no. 2, pp. 302 – 312, 2005.

ͷγεςϜ͸ EPICS ͱͷ਌࿨ੑ͕ߴ͘ɺSu-[5] T. Kobayashi, E. Chishiro, S. Anami,

perKEKB ΍ PSIɺFRIB ౳ͷՃ଎‫͞༻࠾Ͱث‬S. Yamaguchi, and S. Michizono, “RFΕ͍ͯΔɻ

reference distribution system for J-PARC

·ͨɺCERN ͱ GSI Λத৺ʹ։ൃ͕ਐΊlinac,” Nuclear Instruments and MethodsΒΕ͍ͯΔ White Rabbit (WR) [21] ͸ɺSyn-in Physics Research Section A, vol. 585,

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