1. Design and Detailed Plan for In Vacuum Diamond Sensor for PHIL and ATF2 S. Liu, P. Bambade, F. Bogard, P. Cornebise, I. Khvastnov, H. Monard, C. Sylvia FJPPL-FKPPL Workshop on ATF2 Accelerator R&D, Annecy, 17-19 Mar., 2014

2. Contents Planned location of diamond detector at PHIL and ATF2 Expected signal range @ATF2 Design for electronics Design for mechanics Status of preparation for mechanics Summary and Future Plan 2

3. PHIL Same "plug compatible" design for PHIL and ATF2: fabrication will be completed in April 2014 before testing in May-June at PHIL. Diamond Detector ATF2

4. Expected Signal Range @ ATF2 4 Total # Min. ～ Max. #/mm 2 @ Sensor Charge collected/mm 2 Beam 10 6.16*10 7 1.6887μC Halo (δp/p 0 =0.01) 10 7 1.14 *10 4 31.236pC Halo (δp/p 0 =0.0008) 10 7 2.24*10 4 61.376pC Compton 28340 3*10 ～ 5.2*10 2 82.2fC ～ 1.4284pC Tested signal ranged @ PHIL with 4.5X4.5mm 2 diamond pad -> 11fC (with 40dB amplifier) to 1μC (with 12dB attenuator) New design with 4 strips for diamond detector in vacuum

5. Top and Bottom View of PCB PCB Diamond Top side of diamond Bottom side of diamond Bottom side of PCB Top side of PCB CH2 with R3=0.51Ω

6. Special channel for big signal (beam core) Design for Electronics 6 Filter for HV -> final choice of parameters being checked k1k1 k3k3 k2k2 k4k4 k0k0 Bottom side of PCB Cutoff frequency for HV: ω =1/ τ =1/ R 1 C 1 Charging time constant: τ = R 1 C total C total =(C 2 + C 3 + C 4 +C 5 +C 6 ) ≈1uf R 1 =1kΩ ω = 1MHz τ = 1ms SMA-MMCX

10. Prepared Mechanics 756mm 265mm Laptop for control Transformer and ethernet module Moveable stage Min. step: 0.01mm Max. distance: 115mm Velocity can be adjusted 610mm cables for vacuum with SMA/MMCX connectors

11. 11 Summary and Future Plan The design for diamond detector for vacuum is done and the order for 2 first units was sent in Feb. 2014, and two more units will be delivered in 2015; One set of mechanics for diamond detector in vacuum is ready and has been tested at LAL, it will be installed at PHIL for diamond tests in April; The components for the second set are delivered, except for the central vacuum chamber, which will be built by KEK; Holder for diamond detector will be ordered and fabricated soon; Fabrication of diamond detector for vacuum will be completed in April 2014 before testing in May-June at PHIL and installation at ATF2 in autumn.