. Beam Transport System from the INS-SF Cyclotron to TARN
T.Hq.ttori, K.Chida, ToFujino, ToHonrna, T.Hori,* A.Mizobuch,T.Nakanis:qi, Y.Ohshiro, KoSato, S.Yamada and N. Yamazaki
Institute for Nuclear Study, University of Tokyo*Surnitomo Heavy Industries, Ltd.
Abstract
Beam transport system from the INS-SF Cyclotron to TARN wasdesigned and constructed. The system is composed of optical matchingelements, beam monitoring devices and vacuum system.
Beam transport system
This transport system must provide between two different kindsof accelerators, cyclotron and storage ring. It has capabilities tomake matching of transverse phase space and momentum dispersion. The
optical system are composed of four sectibnso They are 1) momentum
analyzing section, 2) double achromatic beam section where both thedispersion function (n) and its derivative (n } are made to be zero,3) matching section of the transverse phase spaces and 4} momentum
matching section where the dispersion parameters are adjusted to thevalues required from the optics of the strage ring.
Analysis of thebeam optics was perBeam size ( llP/P'"" 0 ) of beam.transport
formed with the aidof the computer
program MAGIC.
Calculated results
for the size of beamenvelope and thedispersion function
along the opticalaxis of the system
are shown in Fig.l.
(4)
The layout of thetransport system isillustrated in othersession of thispapero
The beam istransferred from thecyclotron to TARN by
the distance ofDispersion function of beam transport
about 45 meters.
The constructed
optical matchingelements wereFig.l Beam envelopes and dispersion functions
analyzer magnets (BAl and BA4 ), bending magnets ( SWS, BBM and CM ), ten quadrupole
magnets, two electrostatic inflectors, a kicker magnet and steering
magnets of six sets. Beam-monitoring devices consist of seven slitsof various kind , an emittance monitor and five profile monitors.
The vacuum system composed of two regular pumping systems and threestages of differential pumping system.
Construction of elements
The analyzing magnets, named BAl and BA4, were constructed eachof which has a uniform field and is edge focusing type.
-35-The modified window-fram e
structures were chosen anci
designed using the computer
program TRIM. Magnetic , ,field were;measur ed.with·asystem of temperaturecontrolled Hall probe.
Two bending magnets,
SWS and BBM, which weremodified and converted fromthe e.l.emei:lts (),~ the beaJ!lcourses 6£; .·the INS-FM .

cyc16't!:ton ~··.

Main features of thesmall-apertu re quadrupole
mg:g::nets are their strong
magnetic'fie ld gradientsand 26mpactness of themechailicai structure •.
.Fig. 2 Transport line in TARN experi. hall
Tlie_field strepgth weremeasured with the Hall
probe and twin coils' translated horizontally . 'Time ,structure of the incide11t beam to TARN is controlled by q.
kicker magnet of deflectiol1 angle, duration time and maximum .repetition
rate of 1.25 mrad,80lJS arid 100 Hz, respective'ly . Thekic;ker magnetof H-type was made by a ferrite. Figure 2 shows ·the beam .transport.
line in the TARN experimenta l hallo
Results of beam transporting experiment
In 1979, first beam of H; and He 2+were transported from the.
cyclotron to injection point of TARN and injected in the ring. Withthe use of monitoring devices, beam size
were measured at various points which isPHASE SPACE
mrod
given in Fig.3.
6HORIZONTAL
The measured phase ellipes by EM2
emittance monitor are well consistent
with designed ones as shown in Fig.4.
It is concluded that the beam istransported by the optical elements so'mm"that the orbit characteris tics well
-OataofEM2
agree with the desiqned values.
-calculation(12mm-mrad)-4

BEAll ENVELOPE AND TRANSMISSIONBEAM SIZE OF BEAM TRANSPORT LINE IFULL WIDTH)•0Sm

lloriront:al DheC!tion Bllp. Da ·vertical(15mm-mrad}

Calculation Datil--EIIIittance(HI•lSnwn•m nd, - - Emittance(V)•23nvrl'mrad~- Bmit:tanoa(VI•l5,5 rn.m•mrad

PHASE SPACE(41VERTICAL"10IOmm·-- Data of EM 2 (16.Smfl!-mrad)
Calculation

Fig.3 Beam envelope and Transmission-36-(16.5mm-mrad)· (23.0mm-mrad)Fig.4 Beam phase ellipes.