Status of Hadron Beam lines

•K1.1BR Beam Line in 2010 Fall.

•~30kW Pt Target for 2011 Fall.

•SX-Users and Accelerator Division communication meeting.

Hadron Exp. Hall for 2010 Autumn Run

In Summer 2010…..•Construction ofK1.1BR•Extension ofKL Area.

FM Magnet

Completion of K1.1BR Exp. Area

Status in 2010 Spring

South Side: KL and K1.8BR area

K1.1BRExp. Area

KLEx

p. A

rea

K1.

8/K

1.8B

R

Bea

m L

ine

Prim

ary

Prot

on B

eam

High

-p（P

lan)

Oct. 15, 2010, Completed!

K1.1BR: Before Upper Shielding 1

Actual layout of K1.1BR

T1D1

Q1 Q2D2 Q3 Q4 ESS Q5 Q6

MS

D3

Q7 Q8IFX IFY

SX1 SX2

HFOC

• FFProton beam

Shorter length (2.0 m) of ESS instead of optics design (2.5 m)- old K5 ESS is reused -

Smaller D3 bending angle (40°) than beam optics (45°)- performance limit of the recycled D3 magnet -

Longer Q8-FF distance (3.3 m) than the beam optics (1.5 m)- a thick iron wall necessary for radiation safety -

Beam envelop

Ω

= 3.3 msr %δp/p @ HFOC = ±

6 mm; IK+ = 5.4 x 104 /s @5kWΩ = 5.0 msr %δp/p @ HFOC = ±20 mm; IK+ = 8.2 x 104 /s @5kW

(with Pt target)

@ 1.0 GeC/c

L = 21.5 m

Mass Separation Curve800 MeV/cESS = ±300 kVVertical slits = wide openπ/K raio = 1.14

S.W. and K.R. for K1.1BR at 3.6kW

North Side: K1.8, K1.8BR are ready

SKS-System

DORAEMON-System

Beautiful K/π

separation has been achieved in 2009

Summary• J-PARC has started its operational era!• Four beam lines, K1.8, K1.8BR, K1.1BR and

KL are completed.– E19 (Pentaquark) at K1.8, and E17/E15 (X rays

from kaonic atom/kaon-nucleus bound states) at K1.8BR are being started.

– E15 (Rare decay search in ) started its engineering run at KL.

– Beam tuning with several test experiments started at K1.1BR

• Now we are requesting budget for K1.1 and High-p.

Pt Target (50%) for 2011 Fall

• Especially for Autumn 2009 Beam Run for Hadron Facility without Power Load to RFQ

• Accelerator Side; 6 bunch Operation!

• Facility Side;– Target Material; Nickel Platinum

• Ni/Pt SQRT(195/59) ~ 1.8

– Target Loss; 30% 50% • 0.5/0.3 ~ 1.6

Possible Scheme of Intensity Up of Secondaries with Less Load to RFQ?

x6 Intensity!!! (2 kW Beam Power)

x2.7 Intensity!!!

2kW x 2.7 ~ Effective “5kW” Beam for Secondaries

PAC July 2009

Pt target；6mm dia., 60mm length

Ni Target; 54mm thickness, 35mm wide, 50mm high,with same slits as rotating one!

Beam

水冷標的を一時取り除き、駆動機構とともに設置。

5kW Target(Now in use)

Condition:  Separator ±200KV     CM ＝350(K+)/355(K‐) X‐slit full openPrimary Beam 3×1011 ppp（240W)    EQ/RQ :  On    5 spill スケーラーカウント

(但しKトリガー中のK純度は99%以上）SECの安定性は1-2%以内（補正していない）K+

IF‐Y (0,4mm)  :  mass slit=±2.35mm

1178                     2755                  2.33

K/π 比 （×10‐2)             7.3                      12.7                   1.74

Ni  Pt  Pt/Ni 

IF‐Y (‐2,6mm)  :  mass slit=±2.35mm                  1497

3430                  2.29

K/π 比 (×10‐2 )              7.2                       11.9                  1.64            

IF‐Y (‐2,6mm)  :  mass slit=±4.7mm                    2218 

4992

2.25

K/π比((×10‐2 )              5.3                       8.4                   1.60            

K‐Ni  Pt  Pt/Ni 

IF‐Y (0,4mm)  :  mass slit=±2.35mm

331                       678                    2.0

K/π 比 （×10‐2)           2.47                      3.31                  1.34

IF‐Y (‐2,6mm)  :  mass slit=±2.35mm

378                       824                   2.1

K/π 比 （×10‐2)           2.17                      3.08                  1.42

IF‐Y (‐2,6mm)  :  mass slit=±4.7mm

601

1116   

1.9

K/π 比 （×10‐2)           1.67                      2.10                  1.26

Measured

by K1.8BR Group（E15/E1

7)

16/20解析結果～温度分布コンター図

Ａ

［Ａ部拡大］

［℃］

~30kW indirect cooling Pt target

May not survive over ~30kW beam

～30KW Pt target

Beam profile monitor

Pt target at T1 Station

Accurate Iron shieldsFor remote maintenance

～750KW Rotating Ni target

Target driver

Water cooled Ni target

only applicable to beam over ~5０ｋＷ

and can be

operated even in 750kW!

Thickness 54mmDiameter 360mm 85rpm

Ni disk target

Pt target(50%)• New Pt target (50%) is designed and will be

ready soon!• New Pt target(50%) is indirect water cooled and

can be operated at ~30kW beam.• Further consideration is necessary for heavy-

metal target (50%) at higher power beam. • Water cooled Ni target (30%) can be used up to

750kW • Thin Pt rim at Ni disk??? Need serious

simulation study…., anyway.

SX-Users and Accelerator Division communication meeting

In the minutes of the 10th J-PARC PAC meeting held on 16-18 July 2010, Page 6.The PAC was very impressed with the improvements both in fast and slow extraction and congratulates the J-PARC accelerator crews and managements for the achievements. The PAC, however, is still concerned that the long term plan is not yet clear. This is especially true for slow extraction where the path to significantly increasing beam power has not yet been shown. It is essential for several experiments with high physics merit to have more than 100kW of SX beam power.

• Nov. 4th 2010• Nov. 16th 2010• Dec. 10th 2010• Dec. 21st 2010 on “Ripple and Duty Factor”• Jan. 5th 2011

• Power up scenario to ~100kW • Duty factor improvement to 100%

SX-User and Accelerator Division communication meeting

SX-User and Accelerator Division communication meeting

• Informal atmosphere for frank discussion• Deep understanding of the situation of

both accelerator and physics• Any “amateur question” on accelerator is

allowed at any time during the discussion.• A power up scenario to 100kW SX-Beam

is discussed and understood each other

SX-beam power-up schedule• 2010.7~9 Dynamic vamp introduction and great success!• 2010.10~2011.4

– 5kW level business driving and 10kW level examination • 2011.7~9 (Summer shut down)

– SX Collimators• 2011.10~

– 10kW level business driving and 50kW level examination • 2012.7~(ACS installation + Commissioning)

– Titanium chamber introduction mainly on ESS – Stability improvement of each SX machinery – Establishment of the maintenance scenario / local shield

• 2013.10~– 50kW level business driving and 100kW level examination

• 2014.10~– 100kW level business driving

Duty factor improvement• Step by step improvements of present PSs

– Transverse RF– Spill feedback– Upgrade of ripple-Q power supply– Coil short and/or ripple canceller– Other improvements for present PSs

• RF cavity short------------------------------------------------------

• Partial replacement of PSs• Full replacement of PSs