JAERI-Conf 95-021

PA25
A DESIGN OF THE INJECTION SCHEME AND A CONSTRUCTION OF MODELKICKER MAGNET FOR THE HIGH BRILLIANCE LATTICE OF THE PHOTON
FACTORYToshiyuki MITSUHASHI, Masahiro KATOH, and Akira UEDA
Photon Factory, National Laboratory for High Energy Physics,Oho, Tsukuba,Ibaraki, 305 Japan

Abstract
New injection schemes for the three kind oflow emittance lattices of the photon factory was
A traveling wave type kicker magnet
designed.
Ais applied to make a injection pulse bump.
model kicker magnet was also designed andThe magnet is traveling wave
constructed.
kicker magnet and the impedance of the test
magnet was designed to 6.25!1. The experimental
measurement of properties of the magnet will bementioned.

and the positions and angles of the injected beamat the injection point are listed.

Table 1
injection parameters~--------~-

pulse bumpposition and angle of(mm,mrad)injection

beam(mm,mrad)'------------

1. Introduction
In recent few years, the third generationhigh brilliant synchrotron radiation facilities areAt theconstructed and to start the operation.
photon Factory, we are studied to design new highbrilliant lattices those gives a small emittancesnear to the third generation synchrotron radiation
In this paper, it is described that asource 1)2).
of the injection system for the highdesign
brilliant lattices of the Photon Factory and aconstruction of a test model of the kicker magnet.

90" lattice(17,0.0)(27.5 ,1.5)

105" lattice(17,0. 0)(27.5 ,1. 5)

13 5 • lattice(17,0.0)(27.5,2.0)--

The design of the injection bumps are shown in
Fig.1. The position and the angle of the injectedbeam are set 27.5mm and 1.5mrad or 2mrad.
The magnitude and angle of the injection bump are
set 17mm and Omrad. The steering angles of thekicker magnets are listed in table 2.

2. Design of injection system
The design of the injection system consists ofthe four kicker magnets and the two septum
magnets. Hence the injection point is just same
position as in the previous lattice3), these pulse
magnets are located almostly same place as in
the previous arrangement3l. In the present new
design, a fast injection bump(faster than therevolution time 624nsec) is applied to obtain anenough wide aperture for the first few turns of
The present existing septum
the injected beam.
magnets are used again in the new system. Under
these conditions, we optimized the design of theinjection pulse bump for three set of high brilliant
lattices. The phase advance of the lattices are
90degree, 105degree, and 135degree 1)2). In
table 1, the parameters of the injection bumps-94-

Table 2steering angles of the kicker magnets--

90" lattice105" lattice135" lattice

K1

3.20 mrad3.30 mrad3.50 mrad

K2-2.24 mrad-2.30 mrad-2.71 mrad

K3

3.14 mrad3.43 mrad

3.91 mrad

K4

1.79 mrad

1.78 mrad

1. 71 mrad

JAERI-Conf 95-021

3. Construction of a model 6.25n-kicker magnet
As mentioned in previous section, a fastinjection bump(faster than · the revolution time624nsec) is applied to obtain an enough wide
aperture for the first few turns of the injected
beam. To realize the fast injection bump, thetraveling wave magnet is chosen as the kicker
This magnet is divides the C-shapedmagnet.
ferrite core into discrete sections to form a
uniform impedance transmission line4)5). The
sections are capacitively coupled to the returnTo
conductor through a discrete capacitors.
obtain intense magnetic field with limited space of
the kicker magnet, the smaller characteristic
impedance of the magnet is better. Recently, a
6.25n traveling wave magnet was developed by
J.Dinkel et al. at the Fermilab 6l. We also designed
6.25n traveling wave magnet, and to construct a
test-model of the kicker magnet. The design
parameters of the magnet are listed in Table 3.

10-0~-------L--------------~--------~-100~~fHEjfl DI;]I DID~ 8~--88--t83~QQiS(a) bump design for the .90deg. lattice

Table 3magnet design parameters10-0~-------L--------------~--~----~

IMagnetic length

360mm

Gtlp height

60mm

Gt!pwidth

170mm

Peak field

942Gauss(at4500 A)

Characterristic impedance

6.250

Field propagation time

187nscc---10-------

Number of cell
Imductunce per 1cell(b)bump design for the 105deg. lattice

Capacitance per 1cell---

30cell---38.9nH996pF-----------------A schematic drawing of the designed magnet isshown in Fig. 2. In this construction of the testmodel, poll viniliden fluorite(PVdF)was used as adielectric of the capacitor to obtain thecapacitance of 996pF.

10-

0~------~--------------~--------~

Ferrite core-10

HV plote( mJ

Eorth conductor(c) bump design for the 135deg. latticeFig.1 design of the injection bumps

HV conductor

Fig.2 A schematic drawing of the magnet-95-JAERI-Conf 95-021

A general view of themagnet is shown in Fig.3.

Fig.3

constructed test-model

A general view of the test-model magnet

4.Capacitance and Inductance measurements ofthe test-model magnet
The 29-cell magnet's total capacitance andinductance were measured using an HP4284A
Precision LCR Meter. Results of the capacitanceand inductance measurements are shown infigures 4 and 5 respectively.

0100

1 ooof (Hz)In the frequency region from 1kHz to 1OOkHz,themeasured capacitance is almost constant value
37.5 nF and the measured inductance is 1.6J.1H.
By these values of capacitance and inductance,
the characteristic impedance of the magnet
conclude to be 6.5 o. A discrepancy between thecalculated value of the characteristic impedanceof 6.250 and measured value of 6.50 is
considered
toerror in the inductancemeasurement and fringing effect from the edges
in the capacitance measurement. The return
connection between the conductors produce
additional inductance.

references
1)Edited by M.Katoh and Y. Hori,"report of thedesign study on a high brilliance configurationof the PF storage ring" ,KEK report 92-20,(1993).
2)M.Katoh et al., some where of this proceedings.
3)T.Mitsuhashi,M.Katoh,T.Katsura,Y.Satoh,
M:Kobayashi,S.Ohsawa,T.Urano,A.Enomoto,A.Asami,and T.Yamakawa,Particle Accelerators,Vol.33,87,(1990).
4)D.Finder, "Hardware for Full Aperture Kicker
System for the CPS"CERN/MPS/SR71-5.
5)D.E.Anderson and L.X.Schneider, "Proc. of the1993 Particle Accelerator conference",
1354,(1993).
6)J.Dinckei,B.Hanna,C.Jensen,D.Qunell andR.Reilly,"Proc. of the 1993 Particle
Accelerator conference", 1357,(1993).

1 o•

Fig.4 measured capasitance of the magnetl• --- - -·····j- - -r--- --- -~ : ~ ..................................
::::::_r: :::r:::: ~: :1---~-----·······----···········---L................................... l ................................. .

II

1 000

1 04

0 ~~~~~~~~~~~~~~~
1 00

1 05

f (Hz)

Fig.5 measured inductance of the magnet-96-