status of kek e391a その ii

Status of KEK E391a Status of KEK E391a そのその II II

2005 年 3 月 8 日科研費特定領域第二回研究会

つくば国際会議場エポカル阪大：菅谷頼仁

Dec/26/2003

Jan/21/2004

2004/3/8 科研費特定領域第二回研究会、つくば国際会議場エポカル

2

Run summary - Total 300 shift-Run summary - Total 300 shift-

2/17: Beam start2/17-2/22 Beam commissioning,

detector turning2/23-3/4 trigger study and data taking3/10- physics Run


3

Check listCheck list Vacuum

– Low vacuum: <1 Pa– High vacuum: <10^-4 Pa

Detector tuning– Cosmic run– muon beam run

Beam line– Kaon beam position. shape– Kaon yield

Trigger study– rate– acceptance


4

CsI energy calibrationCsI energy calibration

Cosmicmuon beam

beam

cosmic CsI ID

Num

ber

of C

sIR

atio

Ratio of calibration factor

Ratio


5

KL decay measurement KL decay measurement -K-K3,K3,K2,K2,K

KL beam information– yield– momentum– shape

Detector acceptance Analytical efficiency Inefficiency of the detectors Background estimation

decay mode

branch

21 %

0.09 %

0.06 %


6

KL

CsI calorimeterCsI calorimeter

7 cm X 7 cm CsI 5 cm X 5 cm CsI 25 cm X 25 cm Collar counter


7

Take kaon dataTake kaon data

Number of cluster 2 n 5≦ ≦ ≦ n

Vetos– charged– collar

counter– barrel


8

KK33

Find 6 cluster on CsI

Determine vertex of 30

Obtain mass

Event display


9

KL

KK224 cluster6 from K3, only 4 on CsI


10

M6(MeV)

KK33

Mass spectrum of KMass spectrum of K3, K3, K22

M4(MeV)

KK22


11

Beam positionBeam position

Center of Energy: COE = xiEi/Ei

K3 event


12

Online Online monitormonitor

mass X-Y coe

Vertex Momentum

K3 event

Beam line turning

COE-YCOE-X


13

TriggerTrigger data

– only 2 on CsI– 40% deadtime

normalization– K3 and K2

stable operation– cosmic– Xe lamp and LED– muon

Accidental background – clock– accidental trigger

FastBusADC

FastBusADC

TKOTDC

Server computer

network

~0.5msec/event

ＣＰＵＣＰＵＣＰＵ


14

SummarySummary

Experiment start from Feb.17– Vacuum is ready– Detector tuning by cosmic and beam is

done– Beam line turning is ongoing– Trigger study by offline analysis

Data taking – clear peak of K2 and K3

Physics Run will be start from Mar. 10


15

Good job!Good job!

M. Dorochenko, T. Inagaki, N. Ishihara, T. Komatsubara, G.Y.Lim, T. Morimoto, H. Okuno, K. Omata, T. Sato, M. Sekimoto, M. Yamaga, Y. YoshimuraS. Ajimura , Ishii, T.Ikei, Y. Ikemoto, Komatsu, T. Mizuhashi, Nishi, M. Nomachi,T. Oba, K.Sakashita, Y.Shibata, Y. Sugaya, E. Tanaka, T. YamanakaM. Itaya, T. Iwata, T.Hariu, M. Moriya, Sato, Y. Tajima, M. Yamamoto, H. Yoshida, Y. Yoshida A.Lednev, J. Nix, G. Perdue, E. Pod, M. Raqtajizak, Y. Wah, H. WatanabeV. Baranov, N. Khomoutov, A. Kurilin, G. Macharashvili, A. Moiseenko, Z.TsamalaidzeY. Akune, Y. Fujioka, Ishibashi, N. Kawakubo, S. Kobayashi, T. KojimaJ.K.Ahn, H.S.Lee, S.Y.LeeT. ShinkawaY.B.HsiungT. NakanoNomura, Sumida

KEK ：

Osaka University ：

Yamagata University ： University of Chicago ： JINR ： Saga University ： PNU ： NDA ： FNAL: RCNP ： Kyoto University:

status of kek e391a その ii

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