K. Egawa
2013.3.4	

Magnetic fabrication and field measurements	New magnets (resistive) production status	

2013.Mar.	

LER	  	  magnet	

number	speciﬁca3on	

status	

Dipole	  B_arc,	  B_lc	114	  (+2)	  +	  24	  (+2)	

ﬁxed	

installed	  in	  arc	  sec,ons	

Wiggler	  :	  	  half	  /	  single	  pole	  	112	  (+2)	  /	  56	  (+2)	

ﬁxed	

meas.	  &	  installa,on	  	  almost	  completed	

near	  IR	  dipole	1.5	  m	  	  :	  	  1	  2.23	  m	  :	  	  3	ﬁxed	contract	  in	  early	  May	  2013	  	near	  IR	  short	  dipole	2	ﬁxed	contract	  in	  early	  ﬁscal	  2013	  	  	Qw	  (	  Leﬀ	  =0.5837	  )	

20	

≈	  kb_LQw	

wai,ng	  measurement	

QK	  (	  skew	  Q	  )	

10	

ﬁxed	

contract	  in	  early	  ﬁscal	  2013	  	  	Sx_0.3m	  (	  rotatable)	

24	

re-­‐use	  Sx_0.3	

remodel	  in	  ﬁscal	  2013	  	Sx	  rotatable	  support	

24	

ﬁxed	

contract	  in	  early	  May	  2013	  	VerVcal	  Corrector	~	  220	

ﬁxed	

installed	

addi,onal	  ver,cal	  corrector		  *	ﬁxed	

contract	  in	  ﬁscal	  2013	  	  	New	  magnets	  (resistive)	  produc2on	  status	  	  	  	  cont.	

2013.Mar.	

HER	  magnet	

number	speciﬁca3on	status	Dipole	  (4	  m)	  ⊂	  LER	  dipole	13	=	  LER	  B_lc	

wai,ng	  installa,on	

near	  IR	  dipole	2.23	  m	  :	  1	  3.6	  m	  	  :	  	  1	ﬁxed	contract	  in	  early	  May	  2013	  	near	  IR	  short	  dipole	

8	

ﬁxed	

contract	  in	  early	  ﬁscal	  2013	  	addi,onal	  kb	  wiggler	+	  22	

ﬁxed	-­‐	near	  IR	  Q	

2	

ﬁxed	

~	  	  in	  early	  May	  2013	  	Q	  (	  0.56	  m	  )	38	  (+	  1)	≈	  kb_HQ.arc	Q	  (	  1.12	  m	  )	2	  (+	  1)	new	

waiVng	  delivery	  in	  this	  Mar.	

Qx	  		  8	  (+	  1)	≈	  KB_HQx	Qsk	

6		  ﬁxed	

contract	  in	  early	  ﬁscal	  2013	  	  	SL	8	  	  (+2)	  	Sx_abort	2	  	  (+1)	

ﬁxed	

contract	  in	  early	  May	  2013	  		  skew	  Sx	  	24	

kekB_skew_Sx	re-­‐use	

waiVng	  measurement	Field	  measurement	  plan	
KEKB	  wiggler	  	  	  	  	  	  :	  	  completed	  	  	  (	  Imax	  	  :	  	  950	  A	  	  ⇨	  	  1400	  A	  )	  LER	  new	  dipole	  	  :	  	  completed	  new	  wigglers	  	  	  	  	  	  :	  	  	  WS	  completed,	  	  WH	  completed	  tomorrow	  LER_Qw	  (	  Leﬀ	  =0.5837	  )	  	  :	  	  from	  March	  2013	  HER_Qx	  	  	  	  	  	  	  	  	  	  	  	  	  	  	  :	  	  from	  	  Aug.	  or	  Sept.	  2013	  HQ_0.56m	  	  	  	  	  	  	  	  	  	  :	  	  from	  	  May	  ∼	  July	  	  2013	  HQ_1.12m	  	  	  	  	  	  	  	  	  	  :	  	  from	  	  Aug.	  or	  Sept.	  2013	  kb_L_B.arc	  &	  B.Lc	  	  	  	  	  	  	  	  :	  	  re-­‐measure	  in	  Apr.	  2013	  	  （	  Imax	  	  will	  be	  reduced	  !）	  measurement	  in	  FY2014	  	  H_SL	  +	  H_Sx_abort	  	  	  	  :	  	  	  8	  +	  (2)	  +	  2	  +	  (1)	  	  skew_HSx	  	  	  	  	  	  	  	  	  	  	  	  	  :	  	  	  24	  near	  IR	  	  	  	  	  	  	  	  	  	  	  	  	  	  	  	  	  	  near IR dipole : (1 + 3) LER + ( 1 + 1 ) HER
short dipole : 2 LER + 8 HER	  	  	  	  near	  IR	  Q	  	  	  	  	  	  	  	  	  	  	  :	  	  	  2	  HER	  	  	  	  	  	  Qsk	  	  	  	  	  	  	  	  	  	  	  	  	  	  	  	  	  	  	  	  	  :	  	  10	  LER	  +	  	  6	  HER	  skbLB	

New	  LER	  dipole	  	  ﬁeld	  measurement	

6m-long flip coil system	

reference	

mass-measured	After measuring each mass-measured
magnet, the probe comes back to
the reference magnet and measuresit. 	

excitation	
assuming the energy ratio ELER / EHER = 4 / 7I	  [A]	

Bcenter	  	  NMR	  [T]	730	

0.1660075	

0.9953	

760	

0.1728672	

0.9955	800	

0.1819504	

0.9954	

840	

0.1910295	 0.19035	

0.9953	

Poisson	

860	

cf. : Due to constraints of the injection and QCS system,
ELER_max = 4.28571 GeV, EHER_max = 8.75875 GeV 	
k = 0.0561 & E = 4.28571 GeV 	

BL = 0.802 Tm	

BNMR/Bμ=bL[x] measured by long flip coil 	

measure 4 times at each point.
Their variation (example) is ;	

average	

5024673.5	

σ	285.697	

σ	  /average	 5.7e-­‐05	

No. of mag.	
109	
average	 1.0002983	
standard
0.0001976	
deviation	

normalized BL histogram of the 109 dipoles(Imax = 860A )	

k ≈ 0.056 ➩δk ≈ 0.1107 ×10^-4	No. of meas.	 109	
average	 1.0001016	
standard0.0001285	
deviation	

normalized BL histogram of
the reference dipole

SuperKEKB	  wiggler	  system	
・To	  achieve	  the	  required	  small	  emiaance,	  the	  wiggler	  secVons	  need	  to	  be	  remodeled;	  reduce	  the	  wiggle	  pitch	  	  ⇨	  	  1/2	  and	  increase	  peak	  ﬁeld	  	  0.77	  T	  	  ⇨	  	  0.98	  T	  (	  kekB	  wiggler	  for	  example	  ).	  	  ・	  Two	  types	  of	  H-­‐shape	  magnets	  are	  produced	  and	  interleaved	  between	  the	  exisVng	  kekB	  wigglers.	  	  	  	  	  	  	  	  They	  are	  single	  pole	  wiggler	  (WS)	  and	  half	  pole	  wiggler	  (WH)	  half	  pole	

135	
10	kekB	  wiggler	  125	

single	  pole	80	

kekB	  wiggler	

half	  pole	

750	

View at Nikko	WH	 kekB	  wiggler	  WS	  kekB	  wiggler	 WH	  half	  pole	   double	  pole	 single	  pole	half	  pole	
135	
10	125	

80	

750	

LER harmonic coil system	

5 axes mover	

encoder	

air-bearing	

motor	

Single Pole Wiggler (WS) : harmonic coil measurement	BnL (r = a) / B1L (r = a)	
a = probe radius = 50.212 mm	

phase	

WS	excitation
BL	Opera_3
D	excitation
B at center	

BL	  [Tm]	 0.3367	
差し換え	

B_center	  [T]	

0.9993	

Opera 3D cal.
boundary condition[-300, +300] (mm)	

saturation	effective
length	Half Pole Wiggler (WH) : harmonic coil measurement	BnL (r = a) / B1L (r = a)	
a = probe radius = 50.212 mm	

phase	

WH	Opera_3
D	excitation
BL	excitation
B at center	

BL	  [Tm]	 0.1719	
B_center	  [T]	

0.7868	

Opera 3D cal.
boundary condition[-375, +195] (mm)	

saturation	effective
length	WS BL histogram	

WH BL histogram	No. of mag.	
58	
average	
0.35079 Tm	standard
0.00032637 Tm	
deviation	

No. of mag.	
110	
average	 0.182269 Tm	standard
0.00019875 Tm	
deviation	

σ/average	

σ/average	 1.090 10 ^-3	9.304 10 ^-4	k ≈ 0.0263 ➩δk ≈ 0.2448×10^-4	k ≈ 0.01366 ➩δk ≈ 0.149 ×10^-4	

kekB	  LER	  Dipole	

基準磁石	

Ler	  ﬂip	Normalized	  integrated	  ﬁeld	  of	  the	  LER	  dipole	  magnet	  used	  as	  the	  reference.	  	

k ≈ 0.056 ➩δk ≈ 0.26432×10^-4	

New Wigglers, LQw, HQx :Quick measurements by Rotating Coil	HQx & LQw : wiggler & 1.5 m rotating coil measurements	

12.7 T/m required	6.32 T/m required	a	  [mm]	
wigg.	  -­‐	  rot	

43.635	

1.5	  m-­‐rot-­‐Long	

42.08	

1.5	  m-­‐rot-­‐
Short	

37.225	a	  [mm]	
wigg.	  -­‐	  rot	

43.635	

1.5	  m-­‐rot-­‐Long	

42.08	

1.5	  m-­‐rot-­‐
Short	

37.225