SCOPE OF THIS WORKSHOP

NP08 “Kaon Rare Decay Experiments” WGThursday, 06 March 2008

convener: Takeshi K. Komatsubara (KEK, J-PARC Center)

In the NP08 circulars:Since the time of the initial facility design, many new proposals and initiatives have been developed. While the day-1 experiments are yet to be started, it is about the time to start the discussion for the future experiments.

In this meeting, we would like to explore a long-term physics program after the completion of the "phase-1" construction.

The focus is on the future: “phase-2”.

K0L

K+

- 30Tera protons /spill, 15 μA- 50 GeV protons

- hall of 100m long, two target stations and two primary lines

K0L

K+

- 20Tera protons /spill, 9 μA- 30 GeV protons

- hall of 60m long, one target stations and one primary line

“south”

“north”

K0L

K+

- 30Tera protons /spill, 15 μA- 50 GeV protons

- hall of 100m long, two target stations and two primary line

テキストRecovery to these facilitieswas sometimes called“phase-2”, but

that is not “decisive”and should depend on

the plan of our experimentsin the next step:

FOCUS OF THIS WORKSHOP

5

Major Upgrades under Discussions

! Neutrons and Muons– Neutron equipments: How to fill the 23 beamlines (so far about ten

were funded).

– Muon equipments: Among four beamlines, only one will be in operation in 2008. Others have to be funded.

! Hadrons– Must construct several kaon beamlines plus a primary beamline.

– Hadron hall expansion: Necessary to accommodate many user groups.

– Any future possibilities recommended from PAC.

! Neutrinos– Power upgrade.

– The 2 km detector for T2K.

! Nuclear Transmutation

– The major item for Phase 2.

! Others

– Energy upgrade to 50 GeV.

– Third extraction line or Fast Extraction at Hadron Hall?

S.Nagamiya’s slide yesterday

K+ experiments: CERN NA62, J-PARC TREK

KL experiments (1): KEK E391a → J-PARC E14

theory (Y.Okada)long-range kaon programs (FNAL, CERN, J-PARC)

KL experments (2): beyond E14

discussions for the sumary talk (tomorrow afternoon, in 30 minutes)

7

Expectation from NP08

! Neutrinos + Approved Hadrons :

– Reconfirm the construction schedule.

– Desired scenario for the beamtime schedule.

– Needed upgrades for 2009 – 2014.

! Non Approved Experiments:

– Find scientific opportunities.

– Desired location of the experiment.

– Cost (if known) and other requests to the J-PARC.

– Potential participants.

– International contributions, if any.

– Any other issues.

! Preparation for the Users Steering Committee:

– Timeline of all proposed projects.

– Priority setting among individual proposals, if at all possible.

– Demand to the accelerator.

– International competition and/or coordination.

S.Nagamiya’s slide yesterday

KL: E14 (stage-2)K+: TREK (stage-1)

backup slides

10

50m

Phase 2 Phase 3

Phase 1

Phase 2 for Hadron

1000ton（Full Weight including Core, Shield, Cooling---) Traveling should be completed within 1 day (eight hours)

beam