Slide 1UCSB Rod Production presented by Jim LambDOE review, January 20, 2004

UCSB Rod ProductionUCSB Rod Production, Jan. 20 2004, presented by Jim Lamb

Slide 2UCSB Rod Production presented by Jim LambDOE review, January 20, 2004

What is a rod?• Substructure for modular

assembly of tracker barrel.

• 688 rods will be installed into a barrel much like the one in the picture.

• Half of all rods will be produced here at UCSB. The other half produced at FNAL.

Slide 3UCSB Rod Production presented by Jim LambDOE review, January 20, 2004

What is a rod?

• Barrel is grouped into 96 control rings, each containing 5-10 rods.• Rods use token-ring protocol to communicate with data acquisition electronics. • Redundancy architecture allows control ring to operate even in case multiple non-consecutive CCU failure.

Slide 4UCSB Rod Production presented by Jim LambDOE review, January 20, 2004

Rod as it Arrives at UCSB• Major components are Command and Control Unit (CCU) and Analog Opto-hybrids (AOH)

• CCU handles communication between rods, and between rod and readout electronics.

•AOH converts module’s electrical output to optical signal.

• Both of these components, as well as electrical connectivity of the whole, are tested at CERN prior to shipping.

Slide 5UCSB Rod Production presented by Jim LambDOE review, January 20, 2004

Rod Assembly

• First rod assembly took approximately 2 hours.

• Module placed on bare rod using handling tools developed at UCSB (S. Kyre).

• Handling tools developed here are used at FNAL and CERN.

Slide 6UCSB Rod Production presented by Jim LambDOE review, January 20, 2004

Rod Assembly Tools

Slide 7UCSB Rod Production presented by Jim LambDOE review, January 20, 2004

Rod Testing Flow Chart

• Rod burn-in very important.• Only cold-test of entire rod substructure.• First time every rod component (AOH) is subjected to cold, long-term test.

Slide 8UCSB Rod Production presented by Jim LambDOE review, January 20, 2004

Single Rod Test Stand

• Used for functionality test after module installation. Test box provides dry,

dark, and electrical isolated environment

• Also used for cold-test of individual rods (not part of regular production). Connects to rod burn-in

chiller for cooling

Slide 9UCSB Rod Production presented by Jim LambDOE review, January 20, 2004

US Multi-Rod LT Stands

• Up to 8 rods run for 3 days of thermal cycling (room temp to –20C and back). (Burn-in box developed and assembled by University of Rochester.)

• Rods controlled and read-out with software already written for module test. (UCSB helped in that adaptation).

• Data will be adapted so that initial module test (ARCS) criteria can be applied and module quality re-verified.

Slide 10UCSB Rod Production presented by Jim LambDOE review, January 20, 2004

Status• Single rod test stand fully equipped.• One complete rod assembled and tested at room

temperature. Two more rods to be assembled and tested this week.

• UCSB rod burn-in box assembled here December 2003

• Mechanical-grade rod thermal-cycled to –20C.• Lack of power supplies from CERN is only thing

keeping us from full capacity in burn-in and single-rod test stands.

Slide 11UCSB Rod Production presented by Jim LambDOE review, January 20, 2004

Rod Testing Results•Faults clearly seen in rod using new LT

Only opens on rod so far•Laser gain differences add complication to data analysis

Fixed noise cuts will not work due to 50% variation in laser gain

Laser gain is measured by header height, allowing adaptation of cuts.

•Similar work on optimization of calculation of pulse height & peak time variable needed as in module LT•More statistics needed in order to know how best to test rod

ARCS

Rod LT

Slide 12UCSB Rod Production presented by Jim LambDOE review, January 20, 2004

Further Work• Implementation of Rod debugging tests to be

determined. (Hopefully worked out when I visit CERN Rod assembly lab next month.)

• Commissioning of burn-in stand with full capacity.

• 11 bare rods to arrive in late February, including first SS6 rod and first US DS rod.• Design/commission module handling tools for DS rod.

• Implementation of adapting ARCS testing criteria to long-term Rod testing data.