Mitglied der HelmholtzGemeinschaft Goa Mar 11 15 2013

Mitglied der Helmholtz-Gemeinschaft Goa, Mar. 11 -15 2013 Status of day-one experiment commissioning at COSY Huagen Xu 2020/10/26

Goals of day-one experiment at HESR Day-one location • Pbarp elastic scattering • Coincidence (forward&recoil) • Large range of t : 0. 0008 -0. 1 Ge. V 2 Cluster target at ANKE • Test method • Recoil arm construction • Commissioning at COSY 2

Recoil Arm Top view 2020/10/26 Fixed plane for commissioning • Si : 76. 8 x 50 x 1 (mm) (1. 2 mm pitch) • Ge: 80. 4 x 50 x 5/11 (mm) (1. 2 mm pitch)3

Part 1: Detectors Achievements: • Test after rework for Si 2951 -15 To do: • Final assembly MICRON 2020/10/26 Achievements: • High leakage current problem has been fixed To do: • Test with new chamber • Final assembly 4

Part 2: FEE Mesytec: MPR 16: 16 ch with variable gain MPR 1: for rear side MSCF 16: 16 ch with LE timing output MADC 32: peak sensing ADC, input range and bit resolution selectable Received: 1. MPR-16 2. MPR-1 3. MSCF-16 4. MADC-32 quantity 12 / 12 5/5 12 /12 6/6 Achievements: • All new required modules received To do: • Test with final setup 2020/10/26 5

Received: • New NIM crate quantity 2 To be received: • Long cable set quantity 14 Achievements: • Crates, logic modules, NIM crates, racks are complete • Production of cables between detector and preamplifier are finished To do: • Final assembly with long cable set 2020/10/26 6

Part 3 : DAQ and test system DAQ hardware: - VME crate - 6 MADC 32 - 1 CAEN V 785 DAQ software: - IRQ mode (under work) - Online display (realized) New test chamber with coldhead: - 5. 0 e-8 mbar after cooling - 42 K reachable with test Ge detector Achievements: • Hardware completed To do: • Code work for DAQ • Ge test with new test chamber 7

Coldhead Preamplifiers Compressor Venting valve 2020/10/26 Vacuum gauge 8

Part 4: Cluster target • The expected specification of existing cluster target at ANKE location has been verified by target operating group. • The relevant change of the cluster target will be done together with the installation of recoil arm. Proposal to use the ANKE cluster target has been accepted by ANKE collaboration! Achievements: • New collimator has been prepared To do: • Changing the collimator and test its spec afterwards 2020/10/26 9

Part 5: Detector chamber Existing target chamber Achievements: • Chamber construction has been finished by week 8 at ZAT To do: • Final assembly with detectors , Pt 100 sensor as well as heater • Lab test for the complete setup 10

Detector chamber has been constructed 2020/10/26 11

Side flange with cold plate 2020/10/26 12

Part 6: Cooling and Temperature controller Cooling for test chamber • LN 2 solution & coldhead Cooling for experiment • Coldhead is working properly Temperature controller • • Lakeshore 336 controller is being tested and tuned. Heating function is working properly with PID control Achievements: • 40 K reached with no load on coldhead • Temperature control with PID setting is working fine To do: • Operate coldhead with detector and temperature controller 13

General Topics Ø Ø Ø Infrastructure at site (to be fixed in Oct. ) • Power supply (available) • Space to put FEE rack (fixed) • Space to put coldhead compressor (to be found in tunnel) • Cooling water for compressor (existing) • Ventilation status at site (Rack will be outside of tunnel) Installation schedule • Target modification (after Week 16) • Day-one chamber installation (during Week 17 -24) • Pumping time requested (not known yet) Slow control system for day-1 setup • Ø Beam time applied • 2020/10/26 Pumps (integrated into COSY slow control system) On Week 30 and Week 39 14

Thanks for your attention! 2020/10/26 15

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Sketch of day-one experiment Large t-range (pbarp): 0. 0008 -0. 1 Ge. V 2 Starting with one recoil arm 2020/10/26 17

Performance evaluation with pure elastic events Setting for event generator(DPM): Plab : Theta_min : Events : Parameters : 6. 2 Ge. V/c, pure elastic events 0. 113°(~1. 98 mrad) 5 M σel = 18. 97 mb, σtot = 64. 50 mb, b = 11. 89(Ge. V/c)-2, ρ = - 0. 063 t: [0. 0002 -0. 03] lumi: ~ 0. 39% PANDA The measurable t is limited to a small range! 2020/10/26 18