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Blade Tuner assembly

Blade Tuner assembly. Instruction for tuner assembly on a cryomodule May 2011. Required Hardware DWG 886555 (unless otherwise specified). Item # in the assembly procedure always refers to DWG 886555, unless otherwise specified. Legend. Preassembled parts.

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Blade Tuner assembly

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  1. Blade Tuner assembly Instruction for tuner assembly on a cryomodule May 2011

  2. Required HardwareDWG 886555 (unless otherwise specified) Item # in the assembly procedure always refers to DWG 886555,unless otherwise specified

  3. Legend Preassembled parts • Driving unit support elements are already installed on the tunerhalves. top bottom Toward coupler side Toward pick-up side coupler side motor side

  4. Before tuner assembly • Verify that the cavity is under vacuum and it’s in its neutral position. • The cavity must be held by 4 safety rods between the 2 tank rings and across the bellow. Rod pairs are joint by a connecting plate. • An RF engineer should measure and record the cavity frequency. • All tuner mechanical parts, including screw and nuts and excluding piezo stacks, must be cleaned before assembly. Standard Ultrasonic cleaning or hand wiping can be used.

  5. Piezo and main body assembly • Screw the reinforcing ring (# 16) to the half tuner ring (# 2) using the M8x30 screws and elastic washers . Match the existing numbering (picture on the left). • Install the piezo stack (#17) on the reinforcing rings with the required screw (see DWG 443662 for the part list). • Verify that the piezo supports are lined up with the double blade pack (picture on the right).

  6. Insert both the M8 screws (#18 and #9) on the corresponding threaded holes in the He tank pick-up side ring. Insert also a M8 nut on each screw on the inner side of the ring.

  7. Install the A-frame to support the cavity pads • Completely remove the safety rods and their connecting plate.

  8. Put the lower half tuner (#1), already assembled with its reinforcing ring (#16) and piezo (#17), on place. • Verify the orientation of the half tuner: the driving unit support is below the 2-phases pipe the piezo supports are facing the M8 piezo support screw • Fix by hand the BT half to the helium tank ring.

  9. Insert the two safety M8 rods (#8 and #9) between the lower half-tuner and the He tank ring. NB: 3 nuts must be inserted between the tank ring and the tuner (one nut close to the tuner and the double nut close to the ring) and 2 additional nuts off the tank ring. • Verify that: - the two drive unit supports correctly face one another - the second piezo support faces the piezo support screw

  10. Insert and fix by hand the 2 M8x30 screws (#12) and elastic washers (#11) between the reinforcing half-rings and the BT halves. • Insert the remaining 2 safety rods and nuts (#8 and #9) .

  11. Install the 4 connecting plates (#6) across the two BT halves and fix them by tool with the M8 conical head screws (#10).

  12. Firmly fix by tool all the screws. • An RF engineer should measure and record the cavity frequency

  13. Motor installation • Hand tighten the nuts on the safety rods. • Insert the 2 small ball-bearings for the motor pivot in their place in the gearbox housing (DWG 080645 , #14) • Put the motor on place and fix it loosely inserting the two motor pivot (DWG 886425, # 2). • Adjust the nut position on the CuBe screw so that it corresponds to the center position of the support hole. If necessary remove the motor from the support, rotate the screw and put the motor back.

  14. Insert the nut ball-bearings (DWG 890645: #15) They should fit in easily if the nut has been properly placed along the screw. • Place the snap rings on nut spindles (DWG 890645: #20) • Fix the 6 M4 motor pivot screws (DWG 886425: #3)

  15. Piezo pre-tuning • Verify that the cavity is supported through the pads and the safety nuts are released. • Move the piezo screw by hand till it touches the piezo support • Measure the frequency of the cavity • Add the required preload to the piezo tightening the screw of about ¼ of a turn on each side per time. (1/4 turn increases the frequency of about 40-50 kHz) • Measure the final frequency • Fix by hand all 4 the safety nuts for each safety rod (if you need).

  16. Safety nuts release • This is the last procedure concerning BT installation. • Verify that the cavity is supported through the pads. • A calibrated clearance of 0.5 mm must be set between all the safety nuts(2 pair for each of the 4 rods) and the He tank ring on both inner and outer sides. • Screw both inner and outer nuts in order to fit a 0.5 mm spacer between the He tank ring and the first nut. Then screw also the second nut against the first one and fix the double nut in position. 0.5 mm 0.5 mm

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