Recap Clamp Installation RIKEN/RBRC Itaru Nakagawa 1

Clamp Schedule clamps production 40 clamps Install 6/15 Humidity test bench Design Review 5/16 Basically OK, except for a few homework Humidity 1008 ProcurementBid Production Partial Delivery QA Install Delivered to BNL L 2

Octant-7 Clamp Status Octant pin type 1A 1B 3 The dry air cover installed to here 1B

Octant-8 Clamp Status Octant Conductive Rubber Type 4-pin type 1B 2A 2B 1A 1B 2A 4

DesignNumber of Clamps Rubber Type3 4-pins3 1-pin3 1-pin Old Design28 1-pin New Design8 5 Pre-installed Idendical

Clamps Install (north St-3, oct7&oct8) Octant Max 20 clamps /gap Octant To be installed during next maintenance day on June 15 to bottom region of Oct-7&8. Old Design x 10 Old Design x 11 Dry Air Cover x 8 Dry Air Cover x 8 Old Design x 10 New Design x 8 4pin x 3 1A 1B 2A 2B

Dry Air Cover Octant Manifold -> Requested to Carter 10 additional dry air covers to be installed 7 Flow rate 100ccm/clamp?

8 40 Clamps Install Man Power Sanghwa, Maintenance Day clamp Install Maintenance Day clamp Install Sanghwa Park (SNU) Yoshimitsu Imazu Yoshimitsu will stay in BNL until the end of Run11 just in case.

6/15 Access Day Install Work plan is discussed in DC (June 8). Itaru, Yoshimitu, Sangwha, and Hideyuki will work on install. (All confined space trained) Requested 8 hours access to CAD via Takao (RC). Work permit, confined space survey are arranged. (Don Lynch). Install as many as possible clamps up to 40 clamps. Need to monitor stable condition for 1~2 hours after completion of the installation until the hall close. Successful contact rate, drawing current w/ HV will be closely monitored during/after installation. A new AC readout clamp is to be tested w/ anode calibration pulse and a pulser input from the center cathode cable. 9

Installation Procedure (1) 1.Take HV current snapshot. 2.Remove Preinstalled Clamps from Gap-0. 3.Install new clamps to Gap Install clamps to Gap-0. Oct-8 Oct-7

Installation Procedure (2) 1.Inspect target anode pads and record damaged/missing pad channels. 2. Apply conformal coating. 3.Plug-in V-readout pins to a clamp. 4.Mount the clamp. 5.Record V-readouts. Try unscrew and screw if contact is fragile. 6.Remove V readout pins. 7.Ramp up HV every 2 clamps install and check drawing current. 8.(Mount dry air cover) 11

Recording Contacts 12 Damaged/missing pad Damaged/missing resister

Material Readiness QuantityStatus Pig Tail 2M Terminals40Mounted by default 2M Screws100Provided by F. Toldo GND Holder40 x 2Manufactured by F. Toldo Hex screw wrench Regular5Delivered Torque1To be delivered to RIKEN Dry Air Cover Manifold1Available Adupter10Ordered by Carter AC Readout New Board1Delivered Readout cable50 (long+short) Delivered Pocket pulser2Delivered to RBRC Cathode cable adupter 1Custom made by Yoshimitsu Oscilloscope1Available in 1008 Inspection Fiber Scope1In test bench 13 Conformal coating+brush

Preparation Assemble GND Holders Make/repair V readout boards – 2 boards w/ long pins ✔ – 1 board w/ short pins ✔ (for AC readout) 14 6/13 ~ 1008

AC Readout 15 HV side GND side HV side GND side DC Voltage Readout AC Voltage ReadoutOne AC readout clamp will be available for test on June 15 th.