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KLOE-2: Proposal, plans, and upgrade status

KLOE-2: Proposal, plans, and upgrade status. Fabio Bossi, LNF Nov. 22, 2007. The proposed roll-in plan. On September 5th, 2007 we have submitted a proposal to the Laboratory for a two-steps roll-in of KLOE-2 ( LNF-07-19 (IR) ):.

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KLOE-2: Proposal, plans, and upgrade status

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  1. KLOE-2: Proposal, plans, and upgrade status Fabio Bossi, LNF Nov. 22, 2007

  2. The proposed roll-in plan On September 5th, 2007 we have submitted a proposal to the Laboratory for a two-steps roll-in of KLOE-2 (LNF-07-19 (IR)): • Step 0: To be performed on end 2008. Roll-in of the present detector with the minimal upgrades required to run it safely and efficiently • Step 1: To be performed most likely during the fall of2009. Insertion of the more demanding upgrades with the goal of a longer data taking campaign

  3. Step 0: hardware installations At step 0, we plan to: • Insert the new interaction region inside KLOE • Install the new hw DAQ components: L2 and L3 CPUs ,run-control and slow-control servers, Gigabit Ethernet optical link • Produce the minimal set of spare components for the FEE, needed to run the detector efficiently • Properly upgrade the Computing System • Install the external pair of gg-taggers

  4. Step 0: physics potentials Under mildly optimistic hypothesis we can hope to integrate in one year 5 fb1. This would allow us to: • Set the best limits on some QM-CPT-violating parameters • Improve on Ke2 decays, to test LFV with precision at the per mil level • Improve on Kl3and K2 decays, relevant for the determination of Vus • Precisely measure several KS,  and ’ rare decays • Observe for the first time f0 ,a0→ KK transitions • Measure the part of the invariant mass spectrum of the reaction e+e→e+e relevant for ChPT studies

  5. Step 1: hardware installations At step 1 we will be ready for more complex installations: • The Inner Tracker • The forward photon vetos and the new QCALs (NEW!) • The new e.m. calorimeter readout • The internal gg-taggers • Possible further upgrades of the Computing System and/or the FEE, depending upon physics requirements and/or technical opportunities

  6. Step 1: physics potentials At step 1 we will fully exploit all the physics potentials of KLOE-2. We will improve both on systematics, thanks to a better detector and on statistics, thanks to a integrated luminosity  20 fb1. Therefore we will: • Set the ultimate limits on QM-CPT-violatingparameters • Observe for the first time the CPV decays KS→ 30 • Measure the CPV asymmetry in → e+e+decays at the per mil level • Reach a precision at the level of ~ 0.2% on Vus • Further improve on KS ,  and ’ rare decays • Measure Re(’/) with a precision of ~ 104

  7. CPT As an example we take the E.H.N.S. model which introduces three CPT violating parameters a, b, g KLOE-2 becomes competive on  and  with a fewfb-1, and also on  with 20 fb-1 The use of a inner tracker (blue points in figure) improves on the reachable limits by a factor ~3 1 10 fb-1 Step 0 Step 1

  8. KS→  : an experimental puzzle for ChPT KLOE has already announced (and is ready to publish) a result which differs of ~ 3 from a previous NA48 measurement Theoretically, this result is very relevant since KLOE excludes large contributions O(p6) to the amplitude, which are instead implied by NA48 KLOE Step0 Step1 With KLOE-2 we can reach an accuracy comparable or better than the one of NA48

  9. Measurement of Re(ε’/ε) With KLOE-2we can accomplish our first mission of measuring Re(ε’/ε) with an accuracy of order 10-4 KLOE has already measured the ratio Γ(Ks→+)/Γ((Ks→00)with a precision of 2‰ With only ~ 400 pb1 we have also measured B(KL→+ ) with 1% accuracy, and can easily improve on this The above mentioned analysis of KS →  decays, proves that we can do as well for KL →00 , we just need to collect > 10 fb1 of data!

  10. Studies on the nature of scalar mesons KLOE has already published the best results on a0/f0 production in f radiative decays, relevant for the determination of their nature We have also presented the best limit on their decays into kaon pairs, relevant to determine their coupling with the strange quark With KLOE-2 we can give the final answer to this long standing puzzle Step 0 Step 1

  11. Step 0: motivations We believe that entering the beam line as soon as the end of 2008 is justified not only by the physics goals that can be achieved but also by other three important motivations: • DANE must be tuned and optimized in the presence of the KLOE magnetic field. • We need also to study the detector’s response to the new machine conditions • At the end of the SIDDHARTA run, most likely, not all the potentials of the new machine will be exploited. This goal can be achieved only by means of a continuous feedback from a running experiment

  12. Preparation for step 0 Most of the new hardware acquisitions needed for step 0 have been financed by INFN on the year 2008 budget. We have already developed a plan for their insertion and will install them as soon as they are available (most likely early 2008) A part of it (notably the DAQ components) is however sub-judice to the success of the machine experiment Orders for the re-equipment of the FEE test stands have already been submitted In the meanwhile we are ready to start testing the “new” DAQ on the DAFNE luminometers and the prototype gg-tagger during the forthcoming SIDDHARTA run

  13. The  tagger We plan to install two pairs of detectors (one for each side), one inside (LET) and one outside (HET) KLOE, to cover the entire spectrum of the scattered e± The installation of the LETs is more complex since it interferes with that of the inner tracker and of the low-θ calorimeters. It is therefore postponed to step 1. The HETs will however be installed at step 0 Before this, we have planned to test a prototype tagger placed in the HET position during the SIDDHARTA run, to check its performance on beam, its tolerance to the background etc.. The prototype is being mounted, and its related FEE is almost ready

  14. SIDDHARTA tagger

  15. Detector’s work Before rolling-in, the detector has to be opened to: • Check and repair on-detector electronics • Check gas tightness of the chamber • Check stabilty of the calorimeter’s modules • Extract the present IR We have planned to start doing all of that, in collaboration with AD experts, soon after DAFNE restarts operations Also we have to start studying the operations to be performed for the insertion of the new IR, as well as those for detector’s opening when on-beam

  16. Preparation for step 1 Most of the R&D work is presently devoted to the installations foreseen for step 1. We go along three lines: • Study of a new calorimeter’s readout • Construction of the Inner Tracker • Study of new calorimeters in the low-θregion Motivations for the first two points have been given in the past SC meetings. The third one is a new proposal and will be briefly motivated here (and more in detail in the referee’s meeting)

  17. New calorimeter’s readout Both sub-projects (High Granularity, High QuantumEfficiency) have progressed mainly in simulations work (in Roma 1 Roma 3 and Cracow) Results are still preliminary. Confirm improvements on some physics channels. Will be presented at next SC t(ns) A first test beam on a prototype module is planned for next February E(MeV)

  18. IT full scale prototype The full size prototype construction is completed It is instrumented with 1538 readout strips, 650 mm pitch (only rf coordinate) It is presently under preliminary laboratory tests to check it basic functionalities It will be thereafter instrumented with FEE based on the CARIOCA_GEM chip (LHCb), for cosmic rays and test beam runs

  19. CylindricalCathode 3 foils joined together Permaglass annular flanges outside the active area support the detector

  20. Anode read-out FEE bonding flaps 500 µm pitch signal induction area with strips at 650 µm pitch Detail of the read-out flaps to bond FEE

  21. Vertical Insertion System The Cathode is fixed to the bottom Al plate. The other electrodes are fixed to the top plate and are pulled down slowly with a very precise linear bearingequipment GEM1 cathode

  22. HV Distribution boards Drift connection HV and read-out on the same side 6 connections for GEMs supplied by independent HV channels 3 boards are mounted, one for each independent GEM foil

  23. Front-End Electronics: the present solution The FEE for the prototype is based on the 8 channel CARIOCA-GEM chip (LHCb Muon System), and consists of 8Mother boards hosting regulator and I/O connectors. Ready. 16Daughter boards instrumented with 4 CARIOCA chips. Under production. Each FEE slot hosts 4 CARIOCA-GEM chips, for 32 channels readout

  24. Front-End Electronics: the GASTONE solution A new ASIC, GASTONE, is being developed in Bari and Frascati for a 64 channels serial readout • A first 16 channels prototype has been realised: 25 chips (400 channels) already delivered • Orders for the construction of the FE boards housing these chips have been submitted: expected delivery for end of November • If first tests succesfull, plan is to instrument a few channels of the IT prototype

  25. IT simulation results Simulation results for a  track from KS →  pca: point of closest approach • Δx@pca: difference of x coord. between the pca of track wrt the vertex and the vertex • Δz@pca: difference of z coord. between the pca of track wrt the vertex and the vertex • Δpx@pca: difference of momentum px between the track at pca to the vertex and the vertex • Δx@vtx: sigma of the difference of x coord. between the reconstructed vertex and MC vertex

  26. Low Angle Calorimetry: the CCAL case There are at least three analyses that can benefit by an extension at low angle of the KLOE calorimetry: KS→KS→30→0 both for bckg reduction and for increasing acceptance KS→ w/o CCAL Free space for calorimetry with CCAL 30 cm

  27. CCAL: possible choices Need a dense calorimeter with excellent timing performance to face machine background levels. Safe operation granted with ~60 ps/√E Not hygroscopic. Easy to machine to reach proper granularity Two possible solutions under study

  28. The new QCAL Coverage of the quadrupoles (as with the present QCAL) fundamental for KL→00. Past experience shows that timing performance and segmentation along z are fundamental. Use of scintillating tiles BC-408 readout by WLS fibers coupled with SiPM looks very promising

  29. A possible QCAL structure • Dodecagonal structure. • Each wedge, ~1 m long, 5-7 cm thick • ~10 layers of Pb(W)/ 3mm thick tiles • Total thickness ~ 5-6 X0 • Each slab divided in 5x5 (10x10) cm2 tiles readout by SiPM 1 m scintillating tiles

  30. Conclusions We believe that a higher luminosity machine will give us the possibility to consistently improve the physics results that KLOE has obtained so far We propose to roll the detector on beam as soon as the end of 2008 to start immediately the work of machine and detector optimization, and to do some good physics as well We are also working on an ambitious program of hardware upgrades to be installed most likely at the end of 2009, to further improve on physics performance

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