•k1.1br beam line in 2010 fall. •~30kw pt target for 2011
TRANSCRIPT
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)
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
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.
• 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)
~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