A new restart at DAΦNE collider: challenges and preparation · NE collider: challenges and...

A new restart at DAΦNE collider: challenges and preparation

Florin Sirghi INFN-LNF

on behalf of SIDDHARTA-2 collaboration

ASTRA: Advances and open problems in low-energy nuclear and hadronic STRAngeness physics, Trento 2017

in operation since 1998 and expected to terminate its run in collider mode by 2019

SIDDHARTA run finish on 9 Nov. 2009

big improvements in the autumn of 2008

new Crab Waist collision scheme

delivering luminosity: ~12 pb-1/day

daily record: ~15 pb–1/day

record per hour: ~ 0.6 pb–1/h peak luminosity: 4.5E+32 cm-2s-1

DAΦNE collider: the evolution and revolution

August 2008 August 2009

ASTRA: Advances and open problems in low-energy nuclear and hadronic STRAngeness physics, Trento 2017 2

Presenter

Presentation Notes

DAFNE, in operation since 1998, is expected to terminate its run in collider mode by 2019. Afterwards, several possible re-use of the DAFNE complex are under evaluation, spanning from a world-class accelerator physics test bed to single beam electron or positron facility.


SIDDHARTA run: Operation mode: long costing beams

~ 4-5 injection/2 hours

DAΦNE collider: the evolution and revolution KLOE-2 run

Operation mode: topping-up regime Delivered luminosity: ~ 12 pb-1/day Peak luminosity : ~2.2E+32 cm-2 s-1

DAΦNE collider: trouble-ticket/faults history


0 100 200 300 400 500

CONTROL SYSTEMCRYOGENICS

DAFNEFEEDBACK&DIAG&TIMING

FLUIDSKLOE

SIDDHARTALUMI MONITOR

LINACMAINS

OPERATIONPOWER SUPP&MAGNET

RF SYSTEMRADIO PROTECTION

VACUUM KLOE-2

SIDDHARTA

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SDD X-ray detector Cryogenic target Cooling system Vacuum chamber Veto system Kaon trigger Luminosity monitor Beam pipe Shielding Support frame

Service platform

SIDDHARTA-2 apparatus

C. Capoccia, G. Fuga – INFN-LNF ASTRA: Advances and open problems in low-energy nuclear and hadronic STRAngeness physics, Trento 2017

6

SDD X-ray detector SDD technology developed at FBK laboratories (Trento, Italy)

CMOS Preamplifier CUBE

48 SDD arrays (8 SDD cells/array)

total area of 246 cm2

is a charge sensitive preamplifier operating in a pulsed reset regime.

the whole preamplifier is connected close to the SDD (and not only the FET)

the high transconductance of the

input MOS compensates the larger capacitance introduced in the connection SDD-FET

the remaining part of the electronics

(ASIC) can be placed relatively far from the detector (even 10-100 cm)

Old SDD from PNSensor


electrical qualification diced with a diamond blade

SDD production facility – Fondazione Bruno Kessler – FBK, Trento

Example of qualification 2x4 SDD array

optical inspection

8

SDD assembly and testing facility – POLIMI Milano

SDD array from FBK

Special design SDD ceramics

Ready for test final SDD detector

Bonding CUBE preamplifiers on

SDD matrix

Assembly (M1 screws) SDD and cooling holder


9

SDD testing facility – POLIMI Milano After /bonding/gluing /assembling

First x-ray spectroscopy test Final SDD detector mounted on test bench

New qualification for each SDD array before to be install in the final setup


Mn K-alpha line from an 55 Fe source


ASIC development – SFERA readout chip

SDD testing facility – POLIMI Milano

SFERA Main Features: • 16 channels (2 SDD arrays), analog multiplexer readout • IX order, time invariant, semi Gaussian pulse shaping amplifier, implemented in single ended topology • Six different selectable shaping times (500 ns – 6 microsec) • Five selectable energy ranges (10 keV – 70 keV)

11

Cooling cycles at cryogenic temperatures with dummy's and real detectors

SDD testing facility – SMI Vienna

discovering the gluing issues (Kapton bi-adhesive) developing the new design for the ceramic/cooling holder

Thermal Simulations with copper block at 50 K ASTRA: Advances and open problems in low-energy nuclear and hadronic STRAngeness physics, Trento 2017

12

SDD testing facility – LNF Frascati

Test bench for single SDD array (8 channels)

Test bench for multiple-BUS configuration



single SDD array measurements

• Linearity

• Resolution

• Stability

• Timing

• High rate response

Controlled cooling temperatures for SDD down to 120 K Calibration using X-ray Tube: 23 KV @ 10μA and multiple target foils

Source: 90Sr/ 55Fe

Spectroscopic characterization

Trigger studies for timing measurements

using straw tube or plastic scintillators (lab) trigger signal from BTF



Ti Kα

Cu Kα

Fe Kα

Ti Kβ

Cu Kβ Fe Kβ

Br Kα

Br Kβ

Energy (ADC channels)


Linearity vs High Voltage Calibration using x-ray tube

each old detector (6 SDD cells/array) 10 high voltage channels 10 low voltage channels

8 supply voltage for ASIC-chip

New SDD 1 high voltage channel 4 low voltage channels

for ASIC-chip


Resolution vs High Voltage Resolution vs Temperature (Fe K-alpha line)

SDD_4 SDD_2 SDD_3

Fe FWHM 130.9 ± 0.4 eV


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Temperature stability


Channel

ΔT SDD [°C]

mMAX [adc/eV]

mMIN [adc/eV]

(Δm/m )/ΔT [°C-1]

7 9,6 1,6212 ± 0,0002

1,62047 ± 0,00008

7*10-5

Drift Time vs Temperature (done in BTF)


SIDDHARTA-2 cryogenic target

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Working temperature: 30 K Working pressure (overP): 0.3 MPa

Target cell wall is made of a 2-Kapton layer structure

(75 µm + 75 µm + Araldit) ∅130 mm


increase the target stopping power

almost double gas density with respect to SIDDHARTA (3% LHD)

SDDs placed 5 mm from the target wall

130 mm diameter 90 mm height

Presenter

Presentation Notes

In order to increase the target stopping power, the previously described cryogenics scheme was adopted. This allows reaching double gas density with respect to SIDDHARTA (3% LHD). This value of 3% was chosen as a best compromise between the stopping rate and the kaonic deuterium yield estimated behaviour with density. Therefore, the new target geometry (130 mm diameter and 90 mm height) with the SDDs placed 5 mm from the target wall will provide a larger solid angle and takes advantage of the flatter distribution of the stopped kaons. The new configuration also reduces the number of kaons reaching the target wall and producing background

Target + SDD cooling

1 Leybold MD10 – 16 W @ 20 K target cell and SDDs will be cooled

via ultra pure aluminum bars TTC = 30 K TSDD = 70 K

Line driver boards

4 CryoTiger – 30 W @ 120 K Copper - band cooling lines

TLD = 120 K

SIDDHARTA-2 cooling

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ultra pure Al bars

Copper band


add additional cooling power to the SDD and cryogenic target

19

SIDDHARTA-2 vacuum chamber New mechanical

improvements in order to increase the cooling power for

SDD and target

in-situ calibration at low rate

using two ports for x-ray tubes placed in the bottom

part

chamber tested He-leak checked

ready to install all the others

components ASTRA: Advances and open problems in low-energy nuclear

and hadronic STRAngeness physics, Trento 2017

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SIDDHARTA-2 Veto system

Veto system 1 – the external components 12 L-shape modules Do to space limitation

a special light-guide mirror design

Surrounding vacuum chamber barrel of scintillators


time resolutions of ~ 600 ps FWHM pion detection efficiencies of ~98% (PSI test)

Presenter

Presentation Notes

Almost all the channels for the kaon absorption in gas or setup materials include a charged pion. long time that a kaon needs to stop in gas before to be absorbed compared with to a short time for negative kaon to get absorbed in a solid surrounding barrel of scintillators, to identify the products of K absorption on gas nuclei, characterized by a long moderation time (4-5 ns) To achieve the required timing resolution of about 800 ps (FWHM), independent of the ‘hit“ position, the scintillator has to be read-out on both side.

21

SIDDHARTA-2 Veto system 1

Mechanical structure for the final mounting is under construction


For background studies

the first detectors to be install in DAΦNE

22

SiPM from AdvanSiD, Hamamatsu and Ketek

4x4 mm2 NUV-SiPM from FBK good timing compactness

high photon detection efficiency (PDE) time resolution of 485 ps FWHM (BTF)

SIDDHARTA-2 Veto system 2

Veto system - 2 – the internal components

scintillator tiles placed behind each SDD array

positional correlation between SDD and the hit in the scintillator tile (SciTile)

ASTRA: Advances and open problems in low-energy nuclear


BC-408 scintillator tile 45 x 30 x 5 mm3

fast response high light yield

Presenter

Presentation Notes

scintillator tiles placed behind each SDD array, to reject the signals in the X-ray range produced by charged particles


SIDDHARTA-2 Kaon trigger The system is based on

2 pairs of scintillator/PMT’s main functionality as trigger check the collider energy tuning to monitor the transverse IP stability

Top part 10x 10 cm scintillator - long light guides

Bottom part 10x 10 cm scintillator - short light guides IP1

Tested in beam at BTF – LNF and PSI

• prototype under test at LNF

SIDDHARTA-2 Luminosity monitor

2 pieces 8 x 4 cm, thickness = 2 mm

distance y = ± 4 cm off beam

With the goal of luminosity L ~ 1032 cm-2 s-1

Estimated rates: 37 Hz (coincidence) / 62 Hz (on boost-side)

in 5 seconds: 185 counts - 7% / 310 counts (on boost-side) - 5.7%

Prototype build @ Univ. Jagellonian, Krakow

Crucial information for machine tuning and fast feedback

Coincidence rate: 25.7 % per charged kaon pair

single rate at the boost side: 42.7 % single rate at the anti-boost side: 32.3 %


SIDDHARTA-2 interaction point A new low-beta section has to be build

KLOE-2 roll-out with internal magnets focusing quadrupole (QF) quadrupole permanent magnet (QD)

external carbon fiber jacket – ø 66 mm thickness ~ 500 micron internal ultra pure aluminum – ø 55mm thickness ~ 150 micron

new beam pipe optimized to minimize the showers

developed inside by the high flux of collider lost particles

total length – 450 mm internal length - 300 mm

flanges removed major source of

asynchronous background

Presenter

Presentation Notes

The shielding for the luminosity monitor used in the first crab waist development was identified as a major source of asynchronous background and it will be eliminated.


Shielding with new support Support frame

SIDDHARTA-2 apparatus

With the new dimensions of the vacuum chamber Siddharta-2 needs more vertical space (target insertion) it’s necessary to rebuild the support structure with Bosch aluminum profiles

Estimated weight Lead table ~ 500 Kg Two walls ~ 700 Kg

27

SIDDHARTA-2 Service platform


Refurbish the old elements and update to the new regulations regarding safety (anti-earthquake)

28

SIDDHARTA-2 data acquisition system

DAQ architecture based on National Instruments boards (ADC, FPGA) and LabView software

analog readout quality (multiple sampling, cross-talk elimination, stability under rate and temperature fluctuations)

digital signal handling with minimum access time and bus conflict solving

dataflow up to few hundred MB/s (400 MB/s in our case, for a system of 384 channels), almost one

order of magnitude above the capability of the fast VME buses (<80 MB/s) and moreover

requiring a Real-Time processing at a level of tens of nanoseconds (commercial RT systems allows at most microsecond-level control)

interconnection with external systems: Kaon trigger/ Veto / Luminosity monitor implementation with commercially available hardware for sustainable costs



DAΦNE time line after KLOE-2 presented at last LNF Scientific Committee

Q4/2016 Q1/2017 Q2/2017 Q3/2017 Q4/2017 Q1/2018 SIDDHARTA-2 assembling plan Cryogenic target cells

48 SDDs bonded and mounted SDD final tests (with SFERA + DAQ)

Veto-1 constructed/tested Veto-2 constructed/tested Kaon trigger Luminosity monitor constructed/tested

SIDDHARTA beam pipe final mounting, debugging and testing

30

Gantt chart SIDDHARTA-2

installation at DAΦNE


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Thank you for your attention ASTRA: Advances and open problems in low-energy nuclear



SPARES

33 ASTRA: Advances and open problems in low-energy nuclear and hadronic STRAngeness physics, Trento 2017

34 ASTRA: Advances and open problems in low-energy nuclear and hadronic STRAngeness physics, Trento 2017


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New SDD technology: CUBE preamplifier BTF test - July 2017

55Fe spectrum

123.0 eV FWHM

SDD characteristics: • area/cell = 64 mm2

• total area = 512 mm2 • T = - 100°C • drift time < 500 ns

A new restart at DAΦNE collider: challenges and preparation · NE collider: challenges and...

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